CN100495556C

CN100495556C - disk drive

Info

Publication number: CN100495556C
Application number: CNB200510062643XA
Authority: CN
Inventors: 正木清; 三原和博; 吉田修一; 仲昭行; 福山三千雄; 浦山德昭; 菊川正明; 丸冈诚; 大林伸一郎
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 1997-09-25
Filing date: 1998-09-21
Publication date: 2009-06-03
Anticipated expiration: 2018-09-21
Also published as: JPH1196661A; CN1819043A

Abstract

The present invention is intended to provide a disk drive apparatus capable of suppressing the occurrence of undesirable vibration due to the imbalance of a disk and capable of carrying out high-rate transfer, wherein a balancer is formed so as to accommodate a predetermined number of spherical bodies in a ring-shaped track portion having a predetermined shape, and this balancer is provided so as to be rotatable integrally and coaxially with the disk. In addition, in the disk drive apparatus of the present invention, the ring-shaped track of the balancer is divided into plural tracks by partition walls or the like, and a ball used as a balance member is disposed so as to be movable on each divided track. Furthermore, the disk drive apparatus of the present invention is configured so that the disk is held on both sides or one side thereof by using four or more projections or rubber sheets.

Description

disk drive

本申请是申请日为1998年9月21日、申请号为98809374.X、发明名称为“盘片驱动装置”的发明专利申请的分案申请。This application is a divisional application of the invention patent application with the filing date of September 21, 1998, the application number of 98809374.X, and the invention title of "disk drive device".

技术领域 technical field

本发明涉及一种抑制记录媒体盘片失衡造成的不希望的振动或噪声，能够实现稳定记录或重放的盘片驱动装置。The present invention relates to a disc drive device capable of stably recording or reproducing by suppressing unwanted vibration or noise caused by unbalanced recording medium discs.

背景技术 Background technique

近年来，进行数据记录·重放的盘片驱动装置，为了提高数据传送速度，正进一步提高盘片转速。例如CD-ROM盘片驱动装置中，其转速可从现有的5000rpm左右提高到6000rpm以上。这样的趋势不仅反映在桌面计算机用半高的盘片驱动装置，同样也反映在笔记本型计算机用薄型的盘片驱动装置。In recent years, in a disk drive device for recording and reproducing data, the rotation speed of the disk has been further increased in order to increase the data transfer speed. For example, in a CD-ROM disk drive device, its rotational speed can be increased from the existing 5000 rpm to more than 6000 rpm. Such a trend is not only reflected in half-height disk drive devices for desktop computers, but also in thin disk drive devices for notebook computers.

但盘片中存在下面这些情况，有的因为其厚度不均匀造成质量失衡，有的是因为注明盘片所记录内容而粘贴的纸质标贴所造成的失衡。盘片质量失衡量较大的达1gcm。高速旋转这种盘片，便存在这样的问题，有偏离盘片旋转中心的离心力(失衡力)作用，该失衡力所造成的振动传递至整个装置。该失衡力的大小与旋转频率(Hz)(这里旋转频率是指盘片501每单位时间的平均转速(转/秒))的平方成正比增大。例如质量失衡量为1gcm的盘片，只要其转速从5400rpm提高约一成至6000rpm，失衡力便变成约1.2倍大小，振动也同样大幅度增加。However, there are the following situations in the disc, some of which are caused by uneven thickness, and some are caused by the imbalance caused by the paper sticker pasted to indicate the content recorded on the disc. The mass imbalance of the disc is as large as 1gcm. When such a disk is rotated at a high speed, there is a problem that a centrifugal force (unbalanced force) deviated from the rotation center of the disk acts, and the vibration caused by the unbalanced force is transmitted to the entire device. The magnitude of the unbalanced force increases in proportion to the square of the rotation frequency (Hz) (here, the rotation frequency refers to the average rotation speed (rev/s) of the disk 501 per unit time). For example, for a disc with a mass imbalance of 1 gcm, as long as the rotational speed is increased by about 10% from 5400 rpm to 6000 rpm, the imbalance force will become about 1.2 times larger, and the vibration will also increase significantly.

令盘片质量为M(g)，盘片重心距盘片中心的距离为L(cm)，则质量失衡量A(gcm)由A＝M×L表示。Let the mass of the disc be M(g), and the distance between the center of gravity of the disc and the center of the disc be L(cm), then the mass imbalance A(gcm) is represented by A=M×L.

若使这种失衡的盘片高速旋转，有这样的问题产生，即不仅随其振动产生噪声，使盘片旋转驱动用主轴电动机的轴承损伤，而且不能进行稳定的记录或重放。When such an unbalanced disk is rotated at high speed, there is a problem that not only noise is generated due to its vibration, but also the bearing of the spindle motor for driving the disk rotation is damaged, and stable recording or reproduction cannot be performed.

此外，在计算机等装置中组装这种盘片驱动装置时，还发生振动传递至该装置内其他设备而带来不良影响这种问题。In addition, when such a disk drive device is incorporated into a computer or the like, there is a problem that the vibration is transmitted to other devices in the device, causing adverse effects.

综上所述，为了借助于盘片高速旋转来提高数据传送速度，需要研究抑制因盘片质量失衡造成的不希望的振动这一课题。To sum up, in order to increase the data transmission speed by means of the high-speed rotation of the disk, it is necessary to study the subject of suppressing the undesired vibration caused by the imbalance of the disk mass.

以下参照附图说明一例现有的盘片驱动装置。An example of a conventional disk drive device will be described below with reference to the drawings.

图72是表示现有盘片驱动装置主体的立体图。图72中，盘片1由主轴电动机2旋转驱动，读写头3读出盘片1中记录的数据，或向盘片1写入数据。读写头驱动机构5由齿条和齿轮等构成，将读写头驱动用电动机4的旋转运动变换为直线运动传递给读写头3。读写头3构成为靠该读写头驱动机构5沿盘片1径向移动。底盘座6上装配有主轴电动机2、读写头驱动用电动机4和读写头驱动机构5。从装置外部传递给底盘座6的振动和冲击由隔振子7(弹性体)衰减，底盘座6经该隔振子7装配在主底座8上。图72所示的盘片驱动装置，其主体构成为通过主底座8上装配的框架(未图示)组装到计算机装置等当中。Fig. 72 is a perspective view showing the main body of a conventional disk drive device. In FIG. 72 , the disk 1 is rotationally driven by the spindle motor 2 , and the read/write head 3 reads data recorded on the disk 1 or writes data to the disk 1 . The head driving mechanism 5 is composed of a rack and a gear, etc., and converts the rotational motion of the head driving motor 4 into linear motion and transmits it to the head 3 . The head 3 is configured to move in the radial direction of the disk 1 by the head driving mechanism 5 . A spindle motor 2 , a head driving motor 4 , and a head driving mechanism 5 are mounted on the chassis base 6 . The vibration and impact transmitted from the outside of the device to the chassis base 6 are attenuated by the vibration isolator 7 (elastic body), and the chassis base 6 is assembled on the main base 8 through the vibration isolator 7 . The main body of the disk drive device shown in FIG. 72 is configured to be incorporated into a computer device or the like via a frame (not shown) attached to the main chassis 8 .

图73是表示现有盘片驱动装置主轴电动机2周围的侧视剖面图。转台110固定于主轴电动机2的轴21上，可旋转地支持盘片1的夹紧区11。转台110上形成的轴套14的内部内置有靠螺旋弹簧等压紧单元113与盘片1的夹紧孔12的边角紧靠的定位球116。这样，盘片1靠定位球116的压紧动作置放在规定位置上。Fig. 73 is a side sectional view showing the surroundings of the spindle motor 2 of a conventional disk drive device. The turntable 110 is fixed on the shaft 21 of the spindle motor 2 to rotatably support the clamping area 11 of the disk 1 . The sleeve 14 formed on the turntable 110 has a built-in positioning ball 116 which is pressed against the corner of the clamping hole 12 of the disk 1 by the pressing unit 113 such as a coil spring. In this way, the disc 1 is placed at a prescribed position by the pressing action of the positioning ball 116 .

如上所述构成的现有盘片驱动装置中，盘片1置放在转台110上处于夹紧状态时，盘片1通过定位球116与夹紧孔12的边角紧靠来对准中心，并且靠压紧单元113的压紧力保持在转台110上。这样保持的盘片1由主轴电动机2与转台110一体旋转驱动。In the existing disk drive device constructed as above, when the disk 1 is placed on the turntable 110 and is in a clamped state, the center of the disk 1 is aligned by close contact between the positioning ball 116 and the corner of the clamping hole 12, And it is kept on the turntable 110 by the pressing force of the pressing unit 113 . The disk 1 held in this way is rotationally driven integrally with the turntable 110 by the spindle motor 2 .

但具有上述构成的现有盘片驱动装置中，若装上因厚度不均或粘贴有标贴而造成质量失衡的盘片1，使之高速旋转的话，图73所示的盘片1的重心G1便有离心力(失衡力)F作用。其作用方向随盘片1的旋转而旋转。该失衡力F经转台110和主轴电动机2传递至底盘座6，但底盘座6可由弹性体的隔振子7来支撑，随着隔振子7的形变，相对于失衡力F产生很大的振摆旋转。失衡力F的大小与其质量失衡量(用gcm单位表示)和旋转频率平方之乘积成正比，因而底盘座6的振动加速度也大致与盘片1的旋转频率平方成正比而急剧增大。因此，存在这样的问题，即，由于底盘座6本身或底盘座6上装配的读写头驱动机构5的共振等原因，有噪声发生，或由于盘片1和读写头3存在较大振动，因而不可能进行稳定的记录或重放。However, in the existing disk drive device with the above-mentioned structure, if the disk 1 whose mass is unbalanced due to uneven thickness or stickers is attached and rotated at a high speed, the center of gravity of the disk 1 shown in FIG. G1 just has centrifugal force (unbalanced force) F effect. Its direction of action rotates with the rotation of the disc 1 . The unbalanced force F is transmitted to the chassis base 6 through the turntable 110 and the spindle motor 2, but the chassis base 6 can be supported by the vibration isolator 7 of the elastic body, and with the deformation of the vibration isolator 7, a large vibration is generated relative to the unbalanced force F rotate. The magnitude of the unbalanced force F is proportional to the product of its mass unbalance (expressed in gcm unit) and the square of the rotation frequency, so the vibration acceleration of the chassis base 6 is roughly proportional to the square of the rotation frequency of the disc 1 and increases sharply. Therefore, there is a problem that noise occurs due to the resonance of the chassis base 6 itself or the head drive mechanism 5 mounted on the chassis base 6, or due to the large vibration of the disk 1 and the head 3. , making stable recording or playback impossible.

对于上述问题，现有的盘片驱动装置中，为了抑制底盘座6的振动振幅，采取了提高隔振子7弹簧系数、或在底盘座6和主底座8之间设置簧片等弹性材料这种措施。For the above-mentioned problems, in the existing disk driving device, in order to suppress the vibration amplitude of the chassis base 6, the spring coefficient of the vibration isolator 7 is increased, or elastic materials such as reeds are arranged between the chassis base 6 and the main base 8. measure.

但象这样提高底盘座6和主底座8之间结合部位的刚性，便存在这样的问题，即相反当有装置外部来的振动或冲击作用于该盘片驱动装置时，振动或冲击便直接传递至装有盘片1和读写头3等的底盘座6上，无法进行稳定的记录或重放，也就是所说的装置抗振性·抗冲击性均变差。However, if the rigidity of the junction between the chassis base 6 and the main base 8 is increased in this way, there is a problem that, on the contrary, when vibration or impact from the outside of the device acts on the disk drive device, the vibration or impact will be directly transmitted. On the chassis base 6 on which the disk 1 and the read/write head 3 etc. are housed, stable recording or reproduction cannot be performed, that is, the vibration resistance and shock resistance of the device become poor.

此外，还有的问题是，失衡力F造成的底盘座6的振动经主底座8等传递至盘片驱动装置外部，给组装有该盘片驱动装置的计算机装置内的其他设备带来不良影响。In addition, there is another problem that the vibration of the chassis base 6 caused by the unbalanced force F is transmitted to the outside of the disk drive device through the main base 8, etc., and has a bad influence on other equipment in the computer device in which the disk drive device is assembled. .

另外，还有由于失衡力F在主轴电动机2轴承上加有较大侧压，造成轴损转矩增大和轴承损伤，轴承寿命变短这种问题。In addition, there is a problem that the unbalanced force F exerts a large side pressure on the bearing of the spindle motor 2, which causes an increase in the shaft loss torque and damage to the bearing, thereby shortening the life of the bearing.

发明概述Summary of the invention

本发明鉴于上述问题，其目的在于，提供一种失衡盘片高速旋转时也能稳定进行记录或重放，并且对于装置外部来的振动或冲击能够进行高可靠性高速旋转的盘片驱动装置。In view of the above problems, an object of the present invention is to provide a disk drive device capable of recording or reproducing stably even when an unbalanced disk rotates at high speed, and capable of high-speed rotation with high reliability against vibration or shock from outside the device.

为了解决上述问题，本发明的盘片驱动装置，将具有环状轨道部以容纳平衡部件的平衡器设置成与该盘片驱动装置装上的盘片一体旋转，以下给出具体单元。In order to solve the above problems, the disc drive device of the present invention provides a balancer having an annular rail portion for accommodating a balance member to rotate integrally with the disc mounted on the disc drive device. The specific units are given below.

本发明的盘片驱动装置，包括设置成可与装上的盘片一体旋转、并具有环状轨道部以容纳平衡部件的平衡器，The disk drive device of the present invention includes a balancer arranged to rotate integrally with the mounted disk and having an annular rail portion to accommodate the balance member,

令所述平衡部件的总质量为M[g]，所述平衡部件整体的重心距所述环状轨道部中心轴的距离为T[cm]，平衡量Z[gcm]为Let the total mass of the balance member be M[g], the distance between the center of gravity of the balance member as a whole and the central axis of the annular track portion be T[cm], and the balance amount Z[gcm] be

Z＝M×TZ=M×T

则当所述盘片的最高旋转频率为f[Hz]，所述盘片的质量失衡量最大值为A[gcm]，常数为h时，所具有的平衡器满足以下关系：Then when the highest rotation frequency of the disc is f[Hz], the maximum mass imbalance of the disc is A[gcm], and the constant is h, the balancer satisfies the following relationship:

h≧f²×|A-Z|。h≧f ² ×|AZ|.

由此，利用本发明盘片驱动装置，即便使盘片高速旋转，也能确实地抑制因盘片质量失衡所造成的振动，可实现能够高速传送的盘片驱动装置。Thus, with the disk drive device of the present invention, even when the disk is rotated at a high speed, the vibration caused by the disc mass imbalance can be reliably suppressed, and a disk drive device capable of high-speed transfer can be realized.

按照另一方面，本发明的盘片驱动装置，包括设置成可与装上的盘片一体旋转、并具有环状轨道部以容纳球体的平衡器，According to another aspect, the disk drive device of the present invention includes a balancer provided to be rotatable integrally with the loaded disk and having a ring-shaped rail portion to accommodate the ball,

令所述球体半径为r[cm]，所述环状轨道部外周的内壁面半径为S[cm]，所述球体个数为n，以及所述球体比重为ρ，平衡量Z[gcm]为Let the radius of the sphere be r[cm], the radius of the inner wall surface of the outer periphery of the annular track part be S[cm], the number of the spheres be n, and the specific gravity of the sphere be ρ, and the balance Z[gcm] for

Z＝4/3πr²ρ(S-r)²×sin[n sin^-1{r/(S-r)}]Z＝4/3πr ² ρ(Sr) ² ×sin[n sin ^-1 {r/(Sr)}]

h≧f²×|A-Z|。h≧f ² ×|AZ|.

本发明的盘片驱动装置也可以是，当质量失衡量为Ao[gcm]的盘片在所述平衡量Z＝0[gcm]状态下旋转，且振动低于允许值的最高允许旋转频率为fo[Hz]时，所述常数h为In the disk drive device of the present invention, when the disk whose mass imbalance is Ao [gcm] rotates under the state of said balance Z = 0 [gcm], and the maximum allowable rotation frequency of vibration lower than the allowable value is fo[Hz], the constant h is

h＝fo²×Ao。h=fo ² ×Ao.

而且，本发明的盘片驱动装置，较为理想的是，装上的盘片其直径为12[cm]以下，所述常数h为8100。Furthermore, in the disk drive device of the present invention, preferably, the diameter of the mounted disk is 12 [cm] or less, and the constant h is 8100.

另一方面，本发明的盘片驱动装置，包括：对装上的盘片进行记录或重放的读写头；以及设置成可与所述盘片一体旋转、并具有环状轨道部以容纳平衡部件的平衡器，On the other hand, the disk drive device of the present invention includes: a read/write head for recording or reproducing the loaded disk; balancer for balancing parts,

以所述盘片记录面为基准面，将所述平衡器相对于该基准面配置在与所述读写头相同一侧。Taking the disc recording surface as a reference plane, the balancer is arranged on the same side as the read-write head relative to the reference plane.

由此，利用本发明的盘片驱动装置，即便使装上的失衡盘片高速旋转，也可以充分抑制振动，可实现能够高速传送的薄型盘片驱动装置。Thus, with the disk drive device of the present invention, even if the mounted unbalanced disk is rotated at high speed, vibration can be sufficiently suppressed, and a thin disk drive device capable of high-speed transfer can be realized.

所述环状轨道部外周的外壁面至所述环状轨道部中心轴的距离，构成为小于所述读写头位于最内周记录轨时读写头内周一侧端面至所述环状轨道部中心轴的距离。The distance from the outer wall surface of the outer periphery of the annular track part to the central axis of the annular track part is configured to be smaller than the end surface of the inner circumference of the read-write head when the read-write head is located on the innermost recording track to the annular track. distance from the center axis.

另一方面，本发明的盘片驱动装置，包括：On the other hand, the disk drive device of the present invention includes:

固定对盘片进行旋转驱动的主轴电动机的电动机底座；The motor base that fixes the spindle motor that rotates the disk;

通过弹性体装配有所述电动机底座，将对所述盘片进行记录或重放的读写头设置成可在所述盘片半径方向上移动的底盘座；以及The motor base is equipped with an elastic body, and the read-write head for recording or reproducing the disc is set as a chassis seat that can move in the radial direction of the disc; and

设置成可与所述盘片一体旋转、并具有环状轨道部以容纳平衡部件的平衡器。A balancer is provided to be rotatable integrally with the disc, and has an annular rail portion for accommodating a balance member.

由此，利用本发明盘片驱动装置，可以不管盘片质量失衡的大小确实地抑制盘片振动，因而可进行稳定的记录或重放，可以实现能够高速旋转的盘片驱动装置。Thus, with the disc drive device of the present invention, disc vibration can be reliably suppressed regardless of disc mass imbalance, so that stable recording or reproduction can be performed, and a disc drive device capable of high-speed rotation can be realized.

另一方面，本发明的盘片驱动装置，构成为按比所述弹性体形变所引起的所述电动机底座的振摆旋转振动的一次谐振频率高的频率，对所述盘片进行旋转驱动。On the other hand, the disk drive device of the present invention is configured to rotationally drive the disk at a frequency higher than the primary resonance frequency of the whirling rotational vibration of the motor base caused by deformation of the elastic body.

另一方面，本发明的盘片驱动装置，包括设置成可与装上的盘片一体旋转，具有环状轨道部以容纳球体，所述环状轨道部外周的内壁面相对于所述环状轨道部中心轴倾斜的平衡器。On the other hand, the disc driving device of the present invention is provided so as to be integrally rotatable with the loaded disc, and has an annular rail portion for accommodating balls, and the inner wall surface of the outer periphery of the annular rail portion is opposite to the annular rail portion. A balancer with a tilted central axis.

由此，利用本发明的盘片驱动装置，可以实现一种即便是所装上的盘片其质量失衡量非常大，也具有理想的振动抑制效果，而且可减小不适噪声的盘片驱动装置。Thus, by using the disk drive device of the present invention, it is possible to realize a disk drive device that has an ideal vibration suppression effect and can reduce uncomfortable noise even if the loaded disk has a very large mass imbalance. .

另一方面，本发明的盘片驱动装置，包括设置成可与装上的盘片一体旋转，具有环状轨道部以容纳球体，所述环状轨道部外周的内壁其剖面形状呈楔形的平衡器。On the other hand, the disk driving device of the present invention includes a counterbalance device configured to be rotatable integrally with the mounted disk, has an annular track portion to accommodate the ball, and the inner wall of the outer periphery of the annular track portion has a wedge-shaped cross-section. device.

由此，利用本发明盘片驱动装置，可抑制所装上的失衡的盘片所造成的振动，而且可减小平衡器本身产生的不适噪声。Thus, with the disk drive device of the present invention, the vibration caused by the mounted unbalanced disk can be suppressed, and the uncomfortable noise generated by the balancer itself can be reduced.

另一方面，本发明的盘片驱动装置，包括设置成可与装上的盘片一体旋转，具有环状轨道部以容纳球体，所述环状轨道部外周的内壁其剖面形状呈曲面形状的平衡器。On the other hand, the disc driving device of the present invention includes a disc drive unit configured to be rotatable integrally with the mounted disc, has a ring-shaped rail portion for receiving balls, and the inner wall of the outer periphery of the ring-shaped rail portion has a curved cross-sectional shape. balancer.

由此，利用本发明的盘片驱动装置，不论是装上质量失衡大的盘片，还是装上质量失衡小的盘片，都可以确实地抑制振动，而且可减小不适的噪声。Thus, with the disk drive device of the present invention, whether a disk with a large mass imbalance or a disk with a small mass imbalance is mounted, vibration can be reliably suppressed and uncomfortable noise can be reduced.

另一方面，本发明的盘片驱动装置用平衡器，设置成可与装上的盘片一体旋转，具有环状轨道部以容纳球体，On the other hand, the balancer for a disk drive device according to the present invention is provided so as to be integrally rotatable with the mounted disk, and has a ring-shaped rail portion for receiving a ball,

所述环状轨道部外周的内壁面相对于所述环状轨道部中心轴倾斜。The inner wall surface of the outer periphery of the annular track portion is inclined relative to the central axis of the annular track portion.

由此，本发明盘片驱动装置用平衡器，可以抑制平衡器本身噪声的发生。Accordingly, the balancer for a disk drive device according to the present invention can suppress the generation of noise of the balancer itself.

另一方面，本发明的盘片驱动装置用平衡器，设置成可与装上的盘片一体旋转，具有环状轨道部以容纳球体，所述环状轨道部外周的内壁其剖面形状呈楔形。On the other hand, the balancer for a disk drive device according to the present invention is provided so as to be integrally rotatable with the mounted disk, and has a ring-shaped rail portion for accommodating balls, and the inner wall of the outer periphery of the ring-shaped rail portion has a wedge-shaped cross section .

由此，本发明盘片驱动装置，可以抑制平衡器本身噪声的发生。Thus, in the disk drive device of the present invention, the generation of noise of the balancer itself can be suppressed.

另一方面，本发明的盘片驱动装置用平衡器，设置成可与装上的盘片一体旋转，具有环状轨道部以容纳球体，所述环状轨道部外周的内壁其剖面形状呈曲面形状。On the other hand, the balancer for a disk driving device according to the present invention is provided so as to be integrally rotatable with the mounted disk, and has a ring-shaped rail portion for accommodating balls, and the inner wall of the outer periphery of the ring-shaped rail portion has a curved section shape.

由此，利用本发明的盘片驱动装置用平衡器，不论是装上质量失衡大的盘片，还是装上质量失衡小的盘片，都可以确实地抑制振动，而且可以抑制平衡器本身不适噪声的发生。Thus, with the balancer for a disk drive device of the present invention, whether a disk with a large mass imbalance or a disk with a small mass imbalance is loaded, vibration can be reliably suppressed, and the balancer itself can be suppressed from discomfort. Noise occurs.

另一方面，本发明的盘片驱动装置用平衡器，设置成可与装上的盘片一体旋转，并具有环状轨道部以容纳平衡部件，On the other hand, the balancer for a disk drive device according to the present invention is provided so as to be integrally rotatable with the mounted disk, and has an annular rail portion for accommodating the balance member,

Z＝M×TZ=M×T

则当所述盘片的最高旋转频率为f[Hz]，所述盘片的质量失衡量最大值为A[gcm]，常数为h时，满足以下关系：Then when the highest rotation frequency of the disc is f[Hz], the maximum value of the mass imbalance of the disc is A[gcm], and the constant is h, the following relationship is satisfied:

h≧f²×|A-Z|。h≧f ² ×|AZ|.

由此，利用本发明的盘片驱动装置用平衡器，即便使盘片高速旋转，也可以确实抑制盘片质量失衡造成的振动，可实现能够高速传送的盘片驱动装置。Thus, with the disc drive balancer of the present invention, even when the disc is rotated at a high speed, vibration caused by disc mass imbalance can be reliably suppressed, and a disc drive capable of high-speed transfer can be realized.

另一方面，本发明的盘片驱动装置用平衡器，设置成可与装上的盘片一体旋转，并具有环状轨道部以容纳球体，On the other hand, the balancer for a disk drive device according to the present invention is provided so as to be integrally rotatable with the mounted disk, and has a ring-shaped rail portion for accommodating balls,

h≧f²×|A-Z|。h≧f ² ×|AZ|.

本发明的盘片驱动装置用平衡器，也可以当质量失衡量为Ao[gcm]的盘片在所述平衡量Z＝0[gcm]状态下旋转，且振动低于允许值的最高允许旋转频率为fo[Hz]时，所述常数h为The disc drive balancer of the present invention can also be used when the disc whose mass imbalance is Ao [gcm] rotates under the state of the balance Z = 0 [gcm], and the vibration is lower than the maximum allowable rotation of the allowable value. When the frequency is fo[Hz], the constant h is

h＝fo²×Ao。h=fo ² ×Ao.

本发明的盘片驱动装置用平衡器最好是，装上的盘片其直径为12[cm]以下，所述常数h为8100。In the balancer for a disk drive device according to the present invention, it is preferable that the diameter of the mounted disk is 12 [cm] or less, and that the constant h is 8100.

此外，为了达到上述目的，本发明的盘片驱动装置，是将环状轨道分割为多个，并将所分割的各个轨道中具有可移动平衡部件的平衡器设置成可与盘片一体旋转的装置，以下给出具体单元。Furthermore, in order to achieve the above object, the disk drive device of the present invention divides the circular track into a plurality, and installs a balancer having a movable balance member in each of the divided tracks so that it can rotate integrally with the disk. Device, the specific unit is given below.

本发明的盘片驱动装置，包括平衡器，它具有多个圆弧状轨道，以及设置成可在所述圆弧状轨道上移动的平衡部件。The disk drive device of the present invention includes a balancer having a plurality of arc-shaped tracks, and a balance member provided to be movable on the arc-shaped tracks.

由此，利用本发明的盘片驱动装置，不论盘片质量失衡大小如何，总可以确实地抑制底盘座的振动，因而能够进行稳定的记录或重放，可以在不损害抗振和抗冲击特性的情况下，实现可高速旋转的盘片驱动装置。Thus, with the disc drive device of the present invention, regardless of the disc mass imbalance, the vibration of the chassis base can be reliably suppressed, so that stable recording or playback can be performed without impairing the anti-vibration and shock resistance characteristics. In this case, a disk drive device capable of high-speed rotation is realized.

另一方面，本发明的盘片驱动装置，包括平衡器，它具有：将环状轨道分成多个的分割单元；由所述分割单元形成的圆弧状轨道；以及设置成可在所述圆弧状轨道上移动的平衡部件。On the other hand, the disk drive device of the present invention includes a balancer having: a division unit that divides the circular track into a plurality; an arc-shaped track formed by the division unit; A balancing part that moves on an arc track.

本发明的盘片驱动装置，也可以将所述分割单元构成为吸收冲击。In the disk drive device of the present invention, the division unit may be configured to absorb shock.

由此，利用本发明的盘片驱动装置，可以抑制平衡器本身噪声的发生。Thus, with the disk drive device of the present invention, the generation of noise of the balancer itself can be suppressed.

本发明的盘片驱动装置，可以构成为，所述圆弧状轨道至少一部分当中，盘片的旋转轴到至少一个轨道的距离，在所述盘片旋转方向上增加。In the disk drive device of the present invention, the distance from the rotation axis of the disk to at least one track of at least a part of the arc-shaped tracks increases in the direction of rotation of the disk.

本发明的盘片驱动装置，也可以构成为将所述分割单元相对于环状轨道保持为可旋转状态。In the disk drive device of the present invention, the division unit may be held in a rotatable state with respect to the annular rail.

本发明的盘片驱动装置，也可以由磁性材料形成所述平衡部件，并具有在所述分割单元附近配置磁极的磁场产生单元。In the disk drive device of the present invention, the balance member may be formed of a magnetic material, and may include a magnetic field generating unit in which magnetic poles are arranged near the dividing unit.

由此，利用本发明的盘片驱动装置，不论盘片高速旋转还是低速旋转，都可以抑制平衡器本身噪声的发生。Thus, with the disk drive device of the present invention, the generation of noise of the balancer itself can be suppressed regardless of whether the disk rotates at a high speed or at a low speed.

本发明的盘片驱动装置，也可以由磁性材料形成所述平衡部件，并具有在所述分割单元附近配置磁极的磁场产生单元，所述环状轨道当中与所述磁场产生单元的磁极位置相对的位置设置冲击吸收材料。In the disk drive device of the present invention, the balancing member may be formed of a magnetic material, and may include a magnetic field generating unit having a magnetic pole disposed near the dividing unit, and the position of the magnetic pole of the magnetic field generating unit in the circular track is opposite to that of the magnetic field generating unit. The location of the shock-absorbing material is set.

本发明的盘片驱动装置，也可以由磁性材料形成所述平衡部件，并具有以磁力吸引所述平衡部件用的磁场产生单元，所述分割单元和所述环状轨道之间的连接部分按曲面形成。In the disk drive device of the present invention, the balance member may be formed of a magnetic material, and may include a magnetic field generating unit for magnetically attracting the balance member, and the connecting portion between the division unit and the annular rail may be formed by The surface is formed.

本发明的盘片驱动装置，所述环状轨道也可以有多个。In the disk drive device of the present invention, there may also be multiple ring tracks.

由此，利用本发明的盘片驱动装置，不论盘片质量失衡大小如何，总可以确实地抑制底盘座的振动。Therefore, with the disc drive device of the present invention, the vibration of the chassis base can be reliably suppressed regardless of the disc mass imbalance.

本发明的盘片驱动装置用平衡器，具有多个圆弧状轨道，以及设置成可在所述圆弧状轨道上移动的平衡部件。A balancer for a disk drive device according to the present invention includes a plurality of arcuate rails, and a balance member provided so as to be movable on the arcuate rails.

由此，利用本发明的盘片驱动装置用平衡器，不论盘片质量失衡大小如何，总可以确实地抑制底盘座的振动，因而可以抑制平衡器产生的振动、噪声。Thus, the balancer for a disc drive device according to the present invention can always reliably suppress the vibration of the chassis base regardless of the magnitude of disc mass imbalance, thereby suppressing vibration and noise generated by the balancer.

另一方面，本发明的盘片驱动装置用平衡器具有：将环状轨道分成多个的分割单元；由所述分割单元形成的圆弧状轨道；以及设置成可在所述圆弧状轨道上移动的平衡部件。On the other hand, a balancer for a disk drive device according to the present invention has: a division unit that divides a circular track into a plurality; an arc-shaped track formed by the division unit; Balance parts that move up.

本发明的盘片驱动装置用平衡器，也可以将所述分割单元构成为吸收冲击。In the balancer for a disk drive device according to the present invention, the division unit may be configured to absorb shock.

由此，利用本发明的盘片驱动装置用平衡器，可以抑制平衡器本身噪声的发生。Thus, according to the balancer for a disk drive device according to the present invention, the generation of noise of the balancer itself can be suppressed.

本发明的盘片驱动装置用平衡器，可以构成为，所述圆弧状轨道至少一部分当中，盘片的旋转轴到至少一个轨道的距离，在所述盘片旋转方向上增加。In the balancer for a disc drive device according to the present invention, the distance from the rotational axis of the disc to at least one track of at least a part of the arc-shaped tracks increases in the direction of the disc rotation.

本发明的盘片驱动装置用平衡器，也可以构成为将所述分割单元相对于环状轨道保持为可旋转状态。The balancer for a disk drive device according to the present invention may be configured to hold the division unit in a rotatable state with respect to the annular rail.

由此，利用本发明的盘片驱动装置用平衡器，不论盘片质量失衡大小如何，总可以确实地抑制底盘座的振动，因而可以抑制平衡器来的振动、噪声。Thus, the balancer for a disc drive device according to the present invention can reliably suppress the vibration of the chassis base regardless of the disc mass imbalance, so that vibration and noise from the balancer can be suppressed.

本发明的盘片驱动装置用平衡器，也可以由磁性材料形成所述平衡部件，并具有以磁力吸引所述平衡部件用的磁场产生单元。In the balancer for a disk drive device according to the present invention, the balance member may be formed of a magnetic material, and may include a magnetic field generating unit for magnetically attracting the balance member.

由此，利用本发明的盘片驱动装置用平衡器，不论盘片高速旋转还是低速旋转，都可以抑制平衡器本身噪声的发生。Thus, according to the balancer for a disk drive device of the present invention, the generation of noise of the balancer itself can be suppressed regardless of whether the disk is rotating at a high speed or at a low speed.

本发明的盘片驱动装置用平衡器，也可以由磁性材料形成所述平衡部件，并具有以磁力吸引所述平衡部件用的磁场产生单元，所述分割单元和所述环状轨道之间的连接部分按曲面形成。In the balancer for a disk drive device according to the present invention, the balance member may be formed of a magnetic material, and may include a magnetic field generating unit for magnetically attracting the balance member, and the gap between the division unit and the annular rail may be The connection part is formed as a curved surface.

本发明的盘片驱动装置用夹紧机构，包括一具有多个圆弧状轨道、以及设置成可在所述圆弧状轨道上移动的平衡部件的平衡器，并构成为可旋转地夹住转台上所置放的盘片。A clamping mechanism for a disk drive device according to the present invention includes a balancer having a plurality of arc-shaped rails and a balance member arranged to move on the arc-shaped rails, and is configured to rotatably clamp Discs placed on the turntable.

由此，利用本发明的盘片驱动装置用夹紧机构，不论盘片质量失衡大小如何，总可以确实地抑制底盘座的振动，因而可以抑制平衡器产生的振动、噪声。Thus, with the clamp mechanism for a disc drive device of the present invention, the vibration of the chassis base can always be reliably suppressed regardless of the disc mass imbalance, so that vibration and noise generated by the balancer can be suppressed.

本发明的盘片驱动装置用主轴电动机，包括一具有多个圆弧状轨道、以及设置成可在所述圆弧状轨道上移动的平衡部件的平衡器。A spindle motor for a disk drive device according to the present invention includes a balancer having a plurality of arcuate rails and a balancing member provided to be movable on the arcuate rails.

由此，利用本发明的盘片驱动装置用主轴电动机，不论盘片质量失衡大小如何，总可以确实地抑制底盘座的振动，因而可以抑制平衡器产生的振动、噪声。Thus, with the spindle motor for a disc drive device according to the present invention, the vibration of the chassis base can be reliably suppressed regardless of the disc mass imbalance, so that the vibration and noise generated by the balancer can be suppressed.

另一方面，本发明的盘片驱动装置用主轴电动机，包括一具有多个圆弧状轨道、以及设置成可在所述圆弧状轨道上移动的平衡部件的平衡器，所述平衡器设置成可与转子一体旋转。On the other hand, a spindle motor for a disk drive device according to the present invention includes a balancer having a plurality of arcuate rails and a balancing member provided to be movable on the arcuate rails, and the balancer is provided with It can rotate integrally with the rotor.

另一方面，本发明的盘片驱动装置用主轴电动机，包括一具有多个圆弧状轨道、以及设置成可在所述圆弧状轨道上移动的平衡部件的平衡器，所述平衡器设置成可与主轴一体旋转。On the other hand, a spindle motor for a disk drive device according to the present invention includes a balancer having a plurality of arcuate rails and a balancing member provided to be movable on the arcuate rails, and the balancer is provided with It can be rotated integrally with the main shaft.

由此，利用本发明的盘片驱动装置用主轴电动机，不论盘片质量失衡大小如何，总可以确实地抑制底盘座的振动，因而可以抑制平衡器来产生的振动、噪声。Thus, with the spindle motor for a disc drive device according to the present invention, the vibration of the chassis base can be reliably suppressed regardless of the disc mass imbalance, so that vibration and noise generated by the balancer can be suppressed.

本发明的盘片驱动装置用转台，包括一具有多个圆弧状轨道、以及设置成可在所述圆弧状轨道上移动的平衡部件的平衡器，置放所装上的盘片，可旋转地支持所述盘片。The turntable for a disk drive device of the present invention includes a balancer having a plurality of arc-shaped tracks and a balance member arranged to move on the arc-shaped tracks, and the loaded disk is placed, which can The platter is rotatably supported.

由此，利用本发明的盘片驱动装置用转台，不论盘片质量失衡大小如何，总可以确实地抑制底盘座的振动，因而可以抑制平衡器产生的振动、噪声。Thus, with the turntable for a disc drive device according to the present invention, the vibration of the chassis base can be reliably suppressed regardless of the disc mass imbalance, so that the vibration and noise generated by the balancer can be suppressed.

为了解决上述课题，本发明的盘片驱动装置涉及的是作为夹紧并一体旋转驱动盘片用单元的转台和夹紧机构，以下给出具体单元。In order to solve the above-mentioned problems, the disk driving device of the present invention relates to a turntable and a clamping mechanism as means for clamping and integrally rotating a disk. The specific units are given below.

本发明的盘片驱动装置，包括一夹住盘片两面，用4个以上突起支持所述盘片至少单面，所述突起各个前端实际上处于相同平面的盘片支持单元。The disk drive device of the present invention includes a disk supporting unit that clamps both sides of the disk and supports at least one side of the disk with more than four protrusions, and the front ends of the protrusions are actually on the same plane.

由此，利用本发明的盘片驱动装置，确保盘片夹住并高速旋转盘片时，可以实现一种减小盘片盘面振动等引起的失衡所产生的振动、噪声，并能够确保稳定的记录重放，对数据进行高速传送的盘片驱动装置。Thus, using the disk driving device of the present invention, when the disk is clamped and the disk is rotated at a high speed, a vibration and noise caused by the imbalance caused by the vibration of the disk surface and the like can be realized, and a stable operation can be ensured. A disc drive for recording and reproducing data at high speed.

置放盘片的转台；以及a turntable for placing platters; and

具有其各个前端实际上处于相同平面的4个以上突起，靠所述突起和所述转台夹住所述盘片的夹紧机构。There are more than four protrusions whose respective front ends are actually on the same plane, and the clamping mechanism for clamping the disk by the protrusions and the turntable.

由此，利用本发明的盘片驱动装置，利用夹紧机构确保盘片夹住并高速旋转盘片时，可以实现一种减小盘片盘面振动等引起的失衡所产生的振动、噪声，并能够确保稳定的记录重放，对数据进行高速传送的盘片驱动装置。Thus, using the disk driving device of the present invention, when the clamping mechanism is used to ensure that the disk is clamped and the disk is rotated at a high speed, it is possible to reduce the vibration and noise caused by the imbalance caused by the vibration of the disk surface and the like, and A disc drive capable of ensuring stable recording and playback, and high-speed data transfer.

靠各个前端实际上处于相同平面的4个以上突起支持盘片的转台；以及Turntables that support platters by more than 4 protrusions with each front end in substantially the same plane; and

和所述转台一起夹住所述盘片的夹紧机构。A clamping mechanism that clamps the disc together with the turntable.

由此，利用本发明的盘片驱动装置，可以利用转台确保盘片夹住，并减小高速旋转盘片时的振动、噪声。Thus, with the disk drive device of the present invention, the turntable can ensure the clamping of the disk, and reduce the vibration and noise when the disk is rotated at a high speed.

具有4个以上突起，靠该突起和所述转台突起夹住所述盘片的夹紧机构。There are more than 4 protrusions, and the clamping mechanism for clamping the disc by the protrusions and the protrusions of the turntable.

由此，利用本发明的盘片驱动装置，可以利用转台和夹紧机构确保盘片夹住，并减小高速旋转盘片时的振动、噪声。Thus, using the disc driving device of the present invention, the disc clamping can be ensured by the turntable and the clamping mechanism, and the vibration and noise when the disc is rotated at high speed can be reduced.

本发明的盘片驱动装置，除了上述盘片驱动装置的单元以外，所述转台的突起和所述夹紧机构的突起也可以设置于相对位置。In the disk drive device of the present invention, in addition to the above-mentioned units of the disk drive device, the protrusions of the turntable and the protrusions of the clamp mechanism may be provided at opposing positions.

由此，利用本发明的盘片驱动装置，可以利用转台和夹紧机构进一步确保盘片夹住，并减小高速旋转盘片时的振动、噪声。Thus, using the disk drive device of the present invention, the turntable and the clamping mechanism can be used to further ensure the clamping of the disk, and reduce the vibration and noise when the disk is rotated at high speed.

本发明的盘片驱动装置，除了上述盘片驱动装置的单元以外，还可以包括：The disk drive device of the present invention may further include, in addition to the above-mentioned units of the disk drive device:

固定盘片旋转驱动用电动机的底盘座；Chassis base for fixing the motor for disk rotation drive;

通过弹性体装配所述底盘座的主底座；以及assembling the main base of the chassis seat through an elastic body; and

具有内部容纳有多个球体的环状轨道部，并设置成可与盘片一体旋转的平衡器。A balancer that has a ring-shaped rail part that accommodates a plurality of balls and is provided to rotate integrally with the disc.

由此，利用本发明的盘片驱动装置，可以稳定平衡器滚珠的转动，确实地减小盘片偏心所造成的旋转失衡。Therefore, using the disk driving device of the present invention, the rotation of the balancer balls can be stabilized, and the rotation imbalance caused by the eccentricity of the disk can be reliably reduced.

本发明的盘片驱动装置，所述突起也可以配置在与盘片旋转中心同轴的圆周上。In the disk drive device of the present invention, the protrusions may be arranged on a circumference coaxial with the rotation center of the disk.

本发明的盘片驱动装置，所述突起也可以配置在与盘片旋转中心同轴的不同半径的圆周上。In the disk drive device of the present invention, the protrusions may also be arranged on circles with different radii coaxial with the disk rotation center.

由此，利用本发明的盘片驱动装置，可以减小所夹住盘片高速旋转时产生的振动、噪声。Therefore, by using the disk drive device of the present invention, the vibration and noise generated when the clamped disk rotates at high speed can be reduced.

在置放记录媒体盘片的面上设置弹性体的转台；以及An elastic turntable is provided on the surface where the recording medium disc is placed; and

由此，利用本发明的盘片驱动装置，可以方便改善转台的盘片载置面凹凸，并减小高速旋转盘片时的振动、噪声。Therefore, by using the disk driving device of the present invention, the unevenness of the disk loading surface of the turntable can be improved conveniently, and the vibration and noise when the disk is rotated at high speed can be reduced.

在压紧所述盘片的面上设置弹性体，靠所述弹性体和所述转台夹住所述盘片的夹紧机构。An elastic body is arranged on the surface pressing the disk, and the clamping mechanism for clamping the disk depends on the elastic body and the turntable.

由此，利用本发明的盘片驱动装置，可以方便改善夹紧机构的盘片压紧面凹凸，并减小高速旋转盘片时的振动、噪声。Therefore, by using the disk driving device of the present invention, the unevenness of the disk pressing surface of the clamping mechanism can be improved conveniently, and the vibration and noise when the disk is rotated at high speed can be reduced.

由此，利用本发明的盘片驱动装置，可以方便改善转台的盘片载置面和夹紧机构的盘片压紧面凹凸，并减小高速旋转盘片时的振动、噪声。Therefore, using the disk driving device of the present invention, the unevenness of the disk loading surface of the turntable and the disk pressing surface of the clamping mechanism can be improved conveniently, and the vibration and noise when the disk is rotated at high speed can be reduced.

本发明新颖特征固然是具体记载于所附的权利要求书中，但就构成以及内容这两方面而言，本发明以及其他目的或特征均可从结合附图加以理解的以下详细说明当中，得到更为清楚的理解和评价。Although the novel features of the present invention are specifically described in the appended claims, in terms of composition and content, the present invention and other objects or features can be obtained from the following detailed descriptions that are understood in conjunction with the accompanying drawings Clearer understanding and evaluation.

附图简要说明Brief description of the drawings

图1是示意本发明第一实施例盘片驱动装置中主轴电动机2周围的侧视剖面图。FIG. 1 is a side sectional view showing the periphery of a spindle motor 2 in a disk drive apparatus according to a first embodiment of the present invention.

图2是仅示意与图1第一实施例盘片驱动装置中转子80设置为一体的球体平衡器22a的平面剖面图。FIG. 2 is a planar sectional view showing only the ball balancer 22a integrated with the rotor 80 in the disk drive device of the first embodiment shown in FIG. 1 .

图3是表示底盘座6振动加速度实测值以给出本发明第一实施例效果的曲线图。Fig. 3 is a graph showing the measured values of the vibration acceleration of the chassis base 6 to show the effect of the first embodiment of the present invention.

图4是示意本发明第二实施例盘片驱动装置中主轴电动机2周围的侧视剖面图。FIG. 4 is a side sectional view showing the surroundings of the spindle motor 2 in the disk drive apparatus according to the second embodiment of the present invention.

图5是示意本发明第三实施例盘片驱动装置中主轴电动机2周围的侧视剖面图。FIG. 5 is a side sectional view showing the surroundings of the spindle motor 2 in the disk drive apparatus according to the third embodiment of the present invention.

图6是示意本发明第四实施例盘片驱动装置中与转子80一体设置的平衡器22c周围的剖面图。6 is a cross-sectional view showing the periphery of a balancer 22c provided integrally with a rotor 80 in a disk drive apparatus according to a fourth embodiment of the present invention.

图7是示意本发明第五实施例盘片驱动装置中与转子80一体设置的平衡器22d周围的剖面图。7 is a sectional view showing the periphery of a balancer 22d integrally provided with a rotor 80 in a disk drive apparatus according to a fifth embodiment of the present invention.

图8是示意本发明第六实施例盘片驱动装置中与转子80一体设置的平衡器22e周围的剖面图。FIG. 8 is a sectional view showing the periphery of a balancer 22e provided integrally with a rotor 80 in a disk drive apparatus according to a sixth embodiment of the present invention.

图9是示意现有盘片驱动装置的立体图。FIG. 9 is a perspective view schematically showing a conventional disk drive device.

图10是示意现有盘片驱动装置中主轴电动机周围的侧视剖面图。Fig. 10 is a side sectional view showing the surroundings of a spindle motor in a conventional disk drive device.

图11是现有盘片驱动装置中平衡器滚珠动作的说明图。Fig. 11 is an explanatory diagram of the movement of balancer balls in a conventional disk drive.

图12是示意本发明第七实施例盘片驱动装置主轴电动机周围的侧视剖面图。12 is a side sectional view showing the periphery of a spindle motor of a disk drive apparatus according to a seventh embodiment of the present invention.

图13是示意本发明第七实施例盘片驱动装置中作用于平衡器滚珠的力的平面剖面图。Fig. 13 is a plan sectional view showing forces acting on balancer balls in a disk drive device according to a seventh embodiment of the present invention.

图14是本发明第七实施例盘片驱动装置高速旋转质量失衡的盘片时其平衡器中滚珠动作的说明图。FIG. 14 is an explanatory view of the action of the balls in the balancer of the disc drive device rotating a mass-unbalanced disc at high speed according to the seventh embodiment of the present invention.

图15是本发明第七实施例盘片驱动装置高速旋转无质量失衡的均匀盘片时其平衡器中滚珠动作的说明图。Fig. 15 is an explanatory view of the action of the balls in the balancer of the disc drive device rotating a uniform disc without mass imbalance at high speed according to the seventh embodiment of the present invention.

图16是示意本发明第七实施例盘片驱动装置中另一平衡器构成的平面剖视图。Fig. 16 is a plan sectional view showing another balancer in the disk drive device according to the seventh embodiment of the present invention.

图17是示意本发明第七实施例盘片驱动装置中另一平衡器构成的平面剖视图。Fig. 17 is a plan sectional view showing another balancer in the disk drive device according to the seventh embodiment of the present invention.

图18是示意本发明第七实施例盘片驱动装置中另一平衡器构成的平面剖面图。Fig. 18 is a plan sectional view showing the structure of another balancer in the disc drive device according to the seventh embodiment of the present invention.

图19是示意本发明第七实施例盘片驱动装置中另一平衡器构成的平面剖视图。Fig. 19 is a plan sectional view showing another balancer in the disk drive device according to the seventh embodiment of the present invention.

图20是示意本发明第七实施例盘片驱动装置中另一平衡器构成的平面剖视图。Fig. 20 is a plan sectional view showing another balancer in the disk drive device according to the seventh embodiment of the present invention.

图21是示意本发明第七实施例盘片驱动装置中另一平衡器构成的平面剖面图。Fig. 21 is a plan sectional view showing the structure of another balancer in the disk drive device according to the seventh embodiment of the present invention.

图22是示意本发明第七实施例盘片驱动装置中另一平衡器构成的平面剖视图。Fig. 22 is a plan sectional view showing another balancer in the disk drive device according to the seventh embodiment of the present invention.

图23是示意本发明第七实施例盘片驱动装置中另一平衡器构成的平面剖视图。Fig. 23 is a plan sectional view showing the structure of another balancer in the disk drive device according to the seventh embodiment of the present invention.

图24是示意本发明第七实施例盘片驱动装置另两类平衡器构成的平面剖面图(a)和纵剖面图(b)。Fig. 24 is a plan sectional view (a) and a longitudinal sectional view (b) showing the structure of another two types of balancers in the disk drive device according to the seventh embodiment of the present invention.

图25是示意本发明第八实施例盘片驱动装置中平衡器构成的平面剖面图。Fig. 25 is a plan sectional view showing the construction of a balancer in a disk drive apparatus according to an eighth embodiment of the present invention.

图26是示意本发明第八实施例盘片驱动装置中另一平衡器构成的平面剖面图。Fig. 26 is a plan sectional view showing the structure of another balancer in the disk drive apparatus according to the eighth embodiment of the present invention.

图27是示意本发明第八实施例盘片驱动装置中另一平衡器构成的平面剖面图。Fig. 27 is a plan sectional view showing the construction of another balancer in the disk drive apparatus according to the eighth embodiment of the present invention.

图28是示意本发明第九实施例盘片驱动装置中平衡器构成的平面剖面图。Fig. 28 is a plan sectional view showing the construction of a balancer in a disk drive apparatus according to a ninth embodiment of the present invention.

图29是本发明第七实施例盘片驱动装置中平衡器问题点的说明图。Fig. 29 is an explanatory view of a problem of the balancer in the disk drive apparatus of the seventh embodiment of the present invention.

图30是本发明第九实施例盘片驱动装置中另一平衡器构成的平面剖面图。Fig. 30 is a plan sectional view showing another balancer structure in the disk drive device according to the ninth embodiment of the present invention.

图31是本发明第十实施例盘片驱动装置高速旋转质量失衡的盘片时其平衡器中滚珠动作的说明图。Fig. 31 is an explanatory view of the action of the balls in the balancer of the disc drive device according to the tenth embodiment of the present invention when the mass-unbalanced disc is rotated at high speed.

图32是本发明第十实施例盘片驱动装置高速旋转无质量失衡的均匀盘片时其平衡器中滚珠动作的说明图。Fig. 32 is an explanatory view of the action of the balls in the balancer of the disk drive device according to the tenth embodiment of the present invention when a uniform disk without mass imbalance is rotated at high speed.

图33是本发明第十实施例盘片驱动装置中另一平衡器构成的平面剖面图。Fig. 33 is a plan sectional view showing another balancer structure in the disk drive device according to the tenth embodiment of the present invention.

图34是本发明第十实施例盘片驱动装置中另一平衡器构成的平面剖面图。Fig. 34 is a plan sectional view showing another balancer structure in the disk drive device according to the tenth embodiment of the present invention.

图35是本发明第十实施例盘片驱动装置中另一平衡器构成的平面剖面图。Fig. 35 is a plan sectional view showing another balancer structure in the disk drive device according to the tenth embodiment of the present invention.

图36是本发明第十实施例盘片驱动装置中另一平衡器构成的平面剖面图。Fig. 36 is a plan sectional view of another balancer structure in the disk drive device according to the tenth embodiment of the present invention.

图37是本发明第十实施例盘片驱动装置中另一平衡器构成的平面剖面图。Fig. 37 is a plan sectional view showing another balancer structure in the disk drive device according to the tenth embodiment of the present invention.

图38是本发明第十一实施例盘片驱动装置高速旋转质量失衡的盘片时其平衡器中滚珠动作的说明图。Fig. 38 is an explanatory diagram of the action of the balls in the balancer of the disc drive device rotating the mass-unbalanced disc at high speed according to the eleventh embodiment of the present invention.

图39是本发明第十一实施例盘片驱动装置高速旋转质量失衡的盘片时其平衡器中滚珠动作的说明图。Fig. 39 is an explanatory view of the action of the balls in the balancer of the disk drive device in the eleventh embodiment of the present invention when the disk with unbalanced mass is rotated at high speed.

图40是示意本发明第十二实施例盘片驱动装置中平衡器构成的平面剖面图。Fig. 40 is a plan sectional view showing the construction of a balancer in a disk drive apparatus according to a twelfth embodiment of the present invention.

图41是示意本发明第十三实施例盘片驱动装置中平衡器构成的平面剖面图。Fig. 41 is a plan sectional view showing the construction of a balancer in a disk drive apparatus according to a thirteenth embodiment of the present invention.

图42是示意在现有盘片驱动装置上置放盘片501、并由夹紧机构581固定的状态说明图。FIG. 42 is an explanatory view showing a state in which a disk 501 is placed on a conventional disk drive and fixed by a clamp mechanism 581. FIG.

图43是示意现有盘片驱动装置中主轴电动机502周围的侧视剖面图。Fig. 43 is a side sectional view showing the surroundings of the spindle motor 502 in the conventional disk drive device.

图44是示意现有盘片驱动装置中转台582上放置盘片501旋转时盘片501振动状态的侧视剖面图。FIG. 44 is a side sectional view showing the vibrating state of the disk 501 when the disk 501 is placed on the turntable 582 of the conventional disk drive device and rotates.

图45是示意现有盘片驱动装置中盘片501振动2等分模式的平面图。Fig. 45 is a plan view showing a vibration bisecting mode of a disk 501 in a conventional disk drive device.

图46是示意现有盘片驱动装置中盘片501振动4等分模式的平面图。Fig. 46 is a plan view showing a vibration quadrant mode of a disc 501 in a conventional disc drive device.

图47是示意现有盘片驱动装置中盘片501振动6等分模式的平面图。Fig. 47 is a plan view showing a vibrating six-section pattern of a disk 501 in a conventional disk drive device.

图48是示意现有盘片驱动装置中盘片501振动8等分模式的平面图。Fig. 48 is a plan view showing the 8-equivalent mode of vibration of the disk 501 in the conventional disk drive apparatus.

图49是给出现有盘片驱动装置中盘片501振动分析结果的曲线图。Fig. 49 is a graph showing the results of vibration analysis of the disk 501 in the conventional disk drive apparatus.

图50是示意现有盘片驱动装置夹紧机构581的侧视剖面图(a)和示意夹紧机构581与盘片501接触面的夹紧机构581的背面图。50 is a side sectional view (a) showing a clamping mechanism 581 of a conventional disk drive device and a rear view of the clamping mechanism 581 showing a contact surface between the clamping mechanism 581 and the disk 501.

图51是示意现有盘片驱动装置夹紧机构581与盘片501的接触面不同造成盘片501振动不同的侧视剖面图。FIG. 51 is a side sectional view showing that the disc 501 vibrates differently due to the different contact surfaces between the clamping mechanism 581 and the disc 501 of the conventional disc drive device.

图52是示意在本发明第十四实施例中盘片驱动装置上置放盘片501、并由夹紧机构541固定的状态立体图。FIG. 52 is a perspective view illustrating a state in which a disk 501 is placed on the disk drive device and fixed by a clamping mechanism 541 in the fourteenth embodiment of the present invention.

图53是示意本发明第十四实施例盘片驱动装置中主轴电动机502周围的侧视剖面图。Fig. 53 is a side sectional view showing the surroundings of the spindle motor 502 in the disk drive apparatus according to the fourteenth embodiment of the present invention.

图54是示意本发明第十四实施例盘片驱动装置中夹紧机构541的侧视剖面图(a)和背面图(b)。Fig. 54 is a side sectional view (a) and a rear view (b) showing a clamping mechanism 541 in a disc drive device according to a fourteenth embodiment of the present invention.

图55是示意本发明第十四实施例盘片驱动装置中另一夹紧机构541的侧视剖面图(a)和背面图(b)。Fig. 55 is a side sectional view (a) and a rear view (b) showing another clamping mechanism 541 in the disc drive device according to the fourteenth embodiment of the present invention.

图56是示意本发明第十四实施例盘片驱动装置中另一夹紧机构541的侧视剖面图(a)和背面图(b)。Fig. 56 is a side sectional view (a) and a rear view (b) showing another clamping mechanism 541 in the disc drive device according to the fourteenth embodiment of the present invention.

图57是示意本发明第十四实施例盘片驱动装置中设于夹紧机构541上的夹紧突起551形状的局部放大图。FIG. 57 is a partially enlarged view showing the shape of the clamping protrusion 551 provided on the clamping mechanism 541 in the disc drive device according to the fourteenth embodiment of the present invention.

图58是示意本发明第十四实施例盘片驱动装置中设于另一夹紧机构541上的夹紧突起551配置的背面图。FIG. 58 is a rear view showing the arrangement of clamping protrusions 551 provided on another clamping mechanism 541 in the disc drive device according to the fourteenth embodiment of the present invention.

图59是示意本发明第十五实施例盘片驱动装置中夹紧机构541周围的侧视剖面图(a)和背面图(b)。Fig. 59 is a side sectional view (a) and a rear view (b) showing the surroundings of the clamping mechanism 541 in the disk drive apparatus according to the fifteenth embodiment of the present invention.

图60是示意本发明第十六实施例盘片驱动装置中夹紧机构413周围的侧视剖面图(a)和背面图(b)。Fig. 60 is a side sectional view (a) and a rear view (b) showing the surroundings of the clamping mechanism 413 in the disk drive apparatus according to the sixteenth embodiment of the present invention.

图61是示意本发明第十六实施例盘片驱动装置中位置对准机构的立体图。Fig. 61 is a perspective view showing a position alignment mechanism in a disk drive device according to a sixteenth embodiment of the present invention.

图62是示意本发明第十七实施例盘片驱动装置中夹紧机构414周围的侧视剖面图，示出的是停转状态(a)和旋转状态(b)。Fig. 62 is a side sectional view showing the periphery of the clamping mechanism 414 in the disk drive apparatus according to the seventeenth embodiment of the present invention, showing a stalled state (a) and a rotated state (b).

图63是示意本发明第十七实施例盘片驱动装置中夹紧机构541的平面剖面图，示出的是停转状态(a)和旋转状态(b)、(c)。Fig. 63 is a plan sectional view showing the clamping mechanism 541 in the disk drive device according to the seventeenth embodiment of the present invention, showing the stalled state (a) and the rotating state (b), (c).

图64是示意本发明第十七实施例盘片驱动装置中夹紧机构414周围的侧视剖面图。Fig. 64 is a side sectional view showing the surroundings of the clamp mechanism 414 in the disk drive apparatus according to the seventeenth embodiment of the present invention.

图65是示意本发明第十八实施例盘片驱动装置中夹紧机构415周围的侧视剖面图(a)和背面图(b)。Fig. 65 is a side sectional view (a) and a rear view (b) showing the vicinity of the clamping mechanism 415 in the disk drive apparatus of the eighteenth embodiment of the present invention.

图66是示意盘片驱动装置中夹紧机构其固定盘片的方法不同造成盘片形变振动大小不一的侧视剖面图。Fig. 66 is a side cross-sectional view illustrating that different methods of fixing the disc of the clamping mechanism in the disc driving device cause disc deformation and vibration of different magnitudes.

图67是示意本发明第十八实施例盘片驱动装置中另一夹紧机构415周围的侧视剖面图(a)和背面图(b)。Fig. 67 is a side sectional view (a) and a rear view (b) showing the surroundings of another clamp mechanism 415 in the disk drive apparatus of the eighteenth embodiment of the present invention.

图68是示意本发明第十八实施例盘片驱动装置中另一夹紧机构415周围的侧视剖面图(a)和背面图(b)。Fig. 68 is a side sectional view (a) and a rear view (b) showing the surroundings of another clamp mechanism 415 in the disk drive apparatus of the eighteenth embodiment of the present invention.

图69是示意本发明第十九实施例盘片驱动装置中夹紧机构541上设置的夹紧突起551配置和转台216上张贴的转台用橡胶薄层571之间位置关系的夹紧机构541周围的侧视剖面图(a)和夹紧机构541的背面图(b)。FIG. 69 shows the surroundings of the clamping mechanism 541 showing the arrangement of the clamping protrusions 551 provided on the clamping mechanism 541 and the positional relationship between the turntable rubber thin layer 571 attached to the turntable 216 in the disk drive device according to the nineteenth embodiment of the present invention. The side sectional view of (a) and the back view (b) of the clamping mechanism 541.

图70是示意本发明第十九实施例盘片驱动装置中另一夹紧机构416上张贴的夹紧机构用橡胶薄层572和转台212上设置的转台突起552配置之间位置关系的夹紧机构416周围的侧视剖面图(a)和夹紧机构416的背面图(b)。70 is a clamping diagram illustrating the positional relationship between the thin rubber layer 572 for clamping mechanism pasted on another clamping mechanism 416 of the disk drive device of the nineteenth embodiment of the present invention and the configuration of the turntable protrusion 552 provided on the turntable 212. Side sectional view around mechanism 416 (a) and rear view of clamping mechanism 416 (b).

图71是示意本发明第十九实施例盘片驱动装置中另一夹紧机构416上张贴的夹紧机构用橡胶薄层572和转台216上张贴的转台用橡胶薄层571之间位置关系的夹紧机构416周围的侧视剖面图(a)和夹紧机构416的背面图(b)。71 is a diagram illustrating the positional relationship between the thin rubber layer 572 for the clamping mechanism attached to another clamping mechanism 416 and the thin rubber layer 571 for the turntable attached to the turntable 216 in the disk drive device according to the nineteenth embodiment of the present invention. Side sectional view around clamping mechanism 416 (a) and rear view of clamping mechanism 416 (b).

图72是示意现有盘片驱动装置的立体图。Fig. 72 is a perspective view showing a conventional disk drive device.

图73是示意现有盘片驱动装置中主轴电动机2周围的侧视剖面图。Fig. 73 is a side sectional view showing the surroundings of the spindle motor 2 in the conventional disk drive device.

希望考虑，附图中的部分或全部，是利用示意性简要表示来图示的，不必限于这里所示部分对实际相对大小或位置进行的忠实图示。It is wished to consider that some or all of the drawings are illustrated by means of a schematic representation and are not necessarily limited to a faithful representation of the actual relative size or position of the parts shown therein.

实施发明的最佳方式The best way to practice the invention

《第一实施例》"First Embodiment"

以下参照附图说明本发明第一实施例的盘片驱动装置。A disk drive device according to a first embodiment of the present invention will be described below with reference to the drawings.

图1是示意本发明第一实施例盘片驱动装置中主轴电动机2附近的侧视剖面图。图2是仅示意本发明第一实施例中与转子80可一体旋转设置的环状轨道部即中空环状部23的平面剖面图。图3为了示出本发明第一实施例盘片驱动装置的效果，给出底盘座6振动加速度的实测值。1 is a side sectional view showing the vicinity of a spindle motor 2 in a disk drive device according to a first embodiment of the present invention. FIG. 2 is a plan sectional view showing only the ring-shaped rail portion rotatably provided with the rotor 80 , that is, the hollow ring portion 23 in the first embodiment of the present invention. FIG. 3 shows the actual measured values of the vibration acceleration of the chassis base 6 in order to illustrate the effect of the disk drive device according to the first embodiment of the present invention.

第一实施例的盘片驱动装置中，转台110上装上的盘片1构成为由主轴电动机2旋转驱动，由读写头(未图示)进行数据读出或数据写入。而且，第一实施例的盘片驱动装置，如前面图72所示，设有由齿条和齿轮等构成的读写头驱动机构，以及将旋转运动变换为直线运动传递给读写头3的读写头驱动用电动机。构成为读写头利用该读写头驱动机构在盘片1半径方向上移动。底盘座6装配有主轴电动机2、读写头驱动用电动机和读写头驱动机构等。从装置外部传递至底盘座6的振动或冲击靠隔振子(弹性体)7衰减。底盘座6通过该隔振子7装配在主底座8上。图1所示的盘片驱动装置主体构成为通过主底座8上装配的框架(未图示)组装到计算机装置等当中。In the disk drive device of the first embodiment, the disk 1 mounted on the turntable 110 is configured to be rotationally driven by the spindle motor 2, and data is read or written by a head (not shown). Moreover, the disc driving device of the first embodiment, as shown in the preceding figure 72, is provided with a head drive mechanism composed of a rack and a gear, etc., and a mechanism that converts rotational motion into linear motion and transmits it to the head 3. A motor for driving the read/write head. The head is configured to move in the radial direction of the disk 1 by the head driving mechanism. The chassis base 6 is equipped with the spindle motor 2, the head driving motor, the head driving mechanism, and the like. The vibration or impact transmitted from the outside of the device to the chassis base 6 is attenuated by the vibration isolator (elastic body) 7 . The chassis seat 6 is assembled on the main base 8 through the vibration isolator 7 . The main body of the disk drive device shown in FIG. 1 is configured to be incorporated into a computer device or the like via a frame (not shown) attached to the main chassis 8 .

图1中，转台110固定在主轴电动机2的轴21上，可旋转地支持盘片1的夹紧区11。转台110上形成的轴套14的内部内置有靠螺旋弹簧等压紧单元113与盘片1的夹紧孔12的边角碰接的定位球116。这样，盘片1靠定位球116的压紧动作牢靠地配置在规定位置上。In FIG. 1 , a turntable 110 is fixed on the shaft 21 of the spindle motor 2 to rotatably support the clamping area 11 of the disk 1 . The bushing 14 formed on the turntable 110 has a built-in positioning ball 116 that touches the corner of the clamping hole 12 of the disc 1 by a pressing unit 113 such as a coil spring. In this way, the disk 1 is firmly arranged at a predetermined position by the pressing action of the positioning ball 116 .

如上所述，第一实施例的盘片驱动装置构成为，转台110上的盘片1靠定位球116压紧固定，和主轴电动机2的转子80一起同轴旋转驱动。As described above, the disk drive device of the first embodiment is configured such that the disk 1 on the turntable 110 is pressed and fixed by the positioning balls 116, and is driven to rotate coaxially with the rotor 80 of the spindle motor 2.

如图1所示，第一实施例的盘片驱动装置，形成有可与主轴电动机2的转子80一体旋转的球体平衡器22a。图2是仅示意球体平衡器22a的平面剖面图。As shown in FIG. 1, in the disk drive device of the first embodiment, a ball balancer 22a rotatable integrally with the rotor 80 of the spindle motor 2 is formed. Fig. 2 is a plan sectional view illustrating only the ball balancer 22a.

如图1和图2所示，实施例1的球体平衡器22a，由所具有的环状通路与主轴电动机2的主轴21同轴设置的环状轨道部即中空环状部23；以及可移动地容纳在中空环状部23通路内部的多个球体24所构成。As shown in Fig. 1 and Fig. 2, the ball balancer 22a of embodiment 1, the ring-shaped track part that is coaxially provided with the main shaft 21 of spindle motor 2 by the ring-shaped path that has is arranged, i.e. hollow ring-shaped part 23; And movable It is composed of a plurality of balls 24 that are accommodated inside the passage of the hollow annular portion 23 .

如前文所述，在由定位球116将盘片1夹紧在转台110上的状态下，与前面图73所示的现有盘片驱动装置相同，盘片1通过定位球116与夹紧孔12的边角碰接来定位，并配置在规定位置上，同时靠压紧单元113即螺旋弹簧的压紧力保持在转台110上。这样保持的盘片1，便构成为可与转台110、转子80、和球体平衡器22a一起由主轴电动机2进行一体的旋转驱动。As mentioned above, in the state where the disc 1 is clamped on the turntable 110 by the positioning ball 116, the same as the conventional disc driving device shown in FIG. The corners of 12 touch to locate, and configure on the specified position, and keep on the turntable 110 by the pressing force of the pressing unit 113, that is, the coil spring. The disc 1 held in this way is configured to be integrally rotationally driven by the spindle motor 2 together with the turntable 110, the rotor 80, and the ball balancer 22a.

而且，第一实施例的盘片驱动装置中，为了将底盘座6与主底座8联结在一起，采用的是刚性较低的隔振子(弹性体)7。第一实施例的盘片驱动装置中，因隔振子形变造成的底盘座6的机械振动在与盘片1记录面平行方向上的1次谐振频率，设定为低于盘片1的旋转频率。具体来说，第一实施例中，盘片1的旋转频率约为100Hz，而且底盘座6在读写头由读写头驱动机构驱动的方向(存取方向)上的振动其一次谐振频率，和底盘座6在与之正交方向上的振动其一次谐振频率均设定为大约60Hz。Furthermore, in the disk drive device of the first embodiment, in order to connect the chassis base 6 and the main base 8 together, a vibration isolator (elastic body) 7 with relatively low rigidity is used. In the disk drive device of the first embodiment, the primary resonance frequency of the mechanical vibration of the chassis base 6 in the direction parallel to the recording surface of the disk 1 due to the deformation of the vibrator is set to be lower than the rotation frequency of the disk 1 . Specifically, in the first embodiment, the rotation frequency of the disk 1 is about 100 Hz, and the primary resonance frequency of the vibration of the chassis base 6 in the direction (access direction) in which the head is driven by the head drive mechanism is, The primary resonance frequency of the vibration of the chassis base 6 in the direction perpendicular thereto is about 60 Hz.

对于如上所述构成的本发明第一实施例盘片驱动装置，用图1和图2说明按100Hz使质量失衡量大的盘片1旋转时的动作。With respect to the disk drive apparatus according to the first embodiment of the present invention constructed as described above, the operation when the disk 1 having a large mass imbalance is rotated at 100 Hz will be described with reference to FIGS. 1 and 2. FIG.

首先，盘片1存在离心力(也称为失衡力)F作用于其重心G1，其作用方向随盘片1的旋转而旋转。隔振子7因该失衡力F而发生形变，底盘座6和该底盘座6上搭载的所有构成部件均按盘片1旋转频率进行振摆旋转振动。第一实施例中，因隔振子7形变造成的底盘座6的一次谐振频率(约60Hz)设定得低于盘片1旋转频率(约100Hz)。由此，底盘座6的位移方向和失衡力F的作用方向通常处于大致相反方向。Firstly, there is a centrifugal force (also called unbalanced force) F acting on the center of gravity G1 of the disk 1 , and the acting direction of the disk 1 rotates with the rotation of the disk 1 . The vibration isolator 7 is deformed by the unbalanced force F, and the chassis base 6 and all components mounted on the chassis base 6 vibrate and vibrate at the rotation frequency of the disk 1 . In the first embodiment, the primary resonance frequency (about 60 Hz) of the chassis base 6 caused by the deformation of the vibrator 7 is set lower than the rotation frequency of the disk 1 (about 100 Hz). Therefore, the displacement direction of the chassis base 6 and the acting direction of the unbalanced force F are generally in substantially opposite directions.

因而，如图2所示，底盘座6上旋转的盘片1的振摆旋转的中心轴P1，处于失衡力F作用的盘片1的重心G1和主轴电动机旋转中心轴P0之间。Therefore, as shown in FIG. 2 , the center axis P1 of the vibrating rotation of the disk 1 rotating on the chassis base 6 is located between the center of gravity G1 of the disk 1 on which the unbalanced force F acts and the rotation center axis P0 of the spindle motor.

在如上所述状态下，与转子80一体设置的中空环状部23和主轴电动机2的旋转中心轴P0同轴定位，因而中空环状部23的中心即外周的内壁面25的中心P2，和主轴电动机2旋转中心轴P0其位置一致。由此，中空环状部23以振摆旋转中心轴P1为中心进行振摆旋转动作。In the state as described above, the hollow annular portion 23 provided integrally with the rotor 80 is positioned coaxially with the rotation center axis P0 of the spindle motor 2, so that the center of the hollow annular portion 23, that is, the center P2 of the inner wall surface 25 of the outer periphery, and The position of the rotation center axis P0 of the spindle motor 2 coincides. As a result, the hollow annular portion 23 performs a vibrating motion about the vibrating central axis P1.

该振摆旋转动作时，中空环状部23中容纳的球体24(例如图2中上方的球体)存在振摆旋转中心轴P1和球体24重心之间连线方向上的离心力q的作用。而且，球体24通过中空环状部23外周的内壁面25约束其移动，因而有外周内壁面25的支持力N作用于球体24上。来自该外周内壁面25的支持力N作用于朝向外周内壁面25的中心P2的方向。由此，在以外周内壁面25中心P2为中心通过球体24重心的圆周切线方向上，并远离振摆旋转中心轴P1的方向上存在作为离心力q和支持力N的合力的移动力R作用于球体24上。球体24靠该移动力R沿外周内壁面25移动，夹着振摆旋转的中心轴P1，向与盘片1的重心G1大致完全相对的位置移动，和其他球体24一起集中于与重心G1大致完全相对的位置。During the vibrating motion, the spherical body 24 contained in the hollow annular portion 23 (for example, the upper spherical body in FIG. 2 ) acts on the centrifugal force q in the direction of the line between the vibrating rotation center axis P1 and the center of gravity of the spherical body 24 . Moreover, the movement of the ball 24 is constrained by the inner wall surface 25 on the outer periphery of the hollow annular portion 23 , so the supporting force N of the inner wall surface 25 on the outer periphery acts on the ball 24 . The supporting force N from the outer peripheral inner wall surface 25 acts in a direction toward the center P2 of the outer peripheral inner wall surface 25 . Thus, in the direction of the tangential line passing through the center of gravity of the sphere 24 centered on the center P2 of the outer peripheral inner wall surface 25, and in the direction away from the center axis P1 of the vibrating rotation, there is a moving force R acting as the resultant force of the centrifugal force q and the supporting force N. Sphere 24. The ball 24 moves along the outer peripheral inner wall surface 25 by this moving force R, moves to a position approximately completely opposite to the center of gravity G1 of the disc 1 across the central axis P1 of the vibrating rotation, and gathers together with the other balls 24 at approximately the center of gravity G1. exact relative position.

因此，令作用于集中好的各个球体24的离心力q在失衡力相同方向上的分力为平衡力zk的话，可利用该平衡力zk的合力Zn来抵消盘片1旋转所产生的失衡力F。因此，作用于底盘座6的力减小。因而，可以确实地抑制失衡盘片1旋转时所产生的底盘座6的振动。Therefore, if the component force of the centrifugal force q acting on each concentrated ball 24 in the same direction as the unbalanced force is the balance force zk, the resultant force Zn of the balance force zk can be used to offset the unbalanced force F generated by the rotation of the disk 1 . Consequently, the forces acting on the chassis base 6 are reduced. Therefore, the vibration of the chassis base 6 generated when the unbalanced disk 1 rotates can be reliably suppressed.

本发明第一实施例中，可利用作用于如上所述集中的球体24的平衡力Zn来抵消失衡力F，因而以外周内壁面25的中心P2的中心轴P1为中心的振摆旋转半径X1大致为0，图2所示的外周内壁面25的中心P2和振摆旋转的中心轴P1基本一致。In the first embodiment of the present invention, the balance force Zn acting on the concentrated sphere 24 as described above can be used to counteract the unbalanced force F, so the vibration radius of rotation X1 centered on the central axis P1 of the center P2 of the outer peripheral inner wall surface 25 It is approximately 0, and the center P2 of the outer peripheral inner wall surface 25 shown in FIG. 2 and the center axis P1 of the vibrating rotation are substantially coincident.

如图2所示，令球体24的半径为r[cm]，比重为ρ，个数为n，中空环状部23的外周内壁面25的半径为S[cm]，旋转角速度为ω[rad/sec]的话，作用于各个球体24的离心力q的大小为As shown in Figure 2, let the radius of sphere 24 be r[cm], specific gravity be ρ, number be n, the radius of the outer peripheral inner wall surface 25 of hollow annular part 23 be S[cm], rotational angular velocity be ω[rad /sec], the magnitude of the centrifugal force q acting on each sphere 24 is

q＝4/3πr³ρ(S-r)ω² …(1)q＝4/3πr ³ ρ(Sr)ω ² …(1)

这时，令以图2中盘片1的重心G1和外周内壁面25的中心P2之间连线为基准线，如图2所示位于基准线上侧第一个球体24距基准线的角度为α的话，则At this time, let the line connecting the center of gravity G1 of the disc 1 in FIG. 2 and the center P2 of the outer peripheral inner wall surface 25 be the reference line, and as shown in FIG. If it is α, then

α＝sin^-1{r/(S-r)} …(2)α＝sin ^-1 {r/(Sr)} …(2)

位于基准线起第k个球体24其位置距基准线的角度αk为The angle αk between the position of the kth sphere 24 from the datum line and the datum line is

αk＝(2k-1)α …(3)αk=(2k-1)α ...(3)

而位于基准线起第k个球体24其所受的平衡力zk作用力为And the kth sphere 24 from the datum line is subjected to the balance force zk acting force is

zk＝q cos(αk) …(4)zk＝q cos(αk) …(4)

因而，令球体个数n为偶数，设定为n＝2v的话，作用于集中好的球体24中每一个的平衡力zk其合力Zn则为Therefore, if the number n of spheres is an even number, if it is set as n=2v, the resultant force Zn of the balance force zk acting on each of the concentrated spheres 24 is then

Zn＝2q{cosα+con3α+…+cos(2v-1)α} …(5)Zn＝2q{cosα+con3α+...+cos(2v-1)α} ...

利用上述式(2)、式(3)、式(4)变形的话，则If the above formula (2), formula (3) and formula (4) are transformed, then

Zn＝q×1/2×sin{2v sin^-1(r/S-r)}/(r/S-r)Zn＝q×1/2×sin{2v sin ^-1 (r/Sr)}/(r/Sr)

将式(1)代入该式，将v置换为n并进行整理，便有Substituting formula (1) into this formula, replacing v with n and sorting out, we have

Zn＝4/3πr²ρ(S-r)²×sin[n sin^-1{r/(S-r)}]ω² Zn＝4/3πr ² ρ(Sr) ² ×sin[n sin ^-1 {r/(Sr)}]ω ²

这里，令平衡力Zn和旋转角速度ω平方之比为失衡量Z[gcm]的话，则Here, if the ratio of the balance force Zn to the square of the rotational angular velocity ω is the imbalance amount Z[gcm], then

Z＝Zn/ω² …(6)Z=Zn/ω ² ... (6)

式中，Z＝4/3πr²ρ(S-r)²×sin[n sin^-1{r/(S-r)}]In the formula, Z＝4/3πr ² ρ(Sr) ² ×sin[n sin ^-1 {r/(Sr)}]

结果，作用于底盘座6的失衡力，同该球体24的平衡量Z和盘片1质量失衡量A之间的差值即剩余质量失衡量|A-Z|与盘片1旋转频率f[Hz]平方之乘积成正比。因而，只要使f²|A-Z|充分减小，便可以抑制底盘座6的振动。As a result, the unbalanced force acting on the chassis base 6 is the difference between the balance Z of the sphere 24 and the mass imbalance A of the disc 1, that is, the remaining mass imbalance |AZ| and the rotation frequency f[Hz] of the disc 1 The product of squares is proportional. Therefore, if f ² |AZ| is sufficiently reduced, the vibration of the chassis base 6 can be suppressed.

本发明第一实施例的盘片驱动装置，对球体24的半径r[cm]、比重ρ、个数n、以及中空环状部23的外周内壁面25的半径S[cm]进行设定，以便对于预先确定的常数h，使式(6)所示的平衡量Z满足：In the disk drive device of the first embodiment of the present invention, the radius r [cm] of the sphere 24, the specific gravity ρ, the number n, and the radius S [cm] of the outer peripheral inner wall surface 25 of the hollow annular portion 23 are set, So that for a predetermined constant h, the balance quantity Z shown in formula (6) satisfies:

h≧f²×|A-Z| …(7)h≧f ² ×|AZ| …(7)

式中，常数h是指底盘座6振动大小抑制为可实现稳定记录或重放的最大允许量时的f²×A的大小。例如，12cm直径的CD-ROM盘片其最大质量失衡量A为1gcm大小，现有盘片驱动装置中，该质量失衡量A为1gcm的盘片旋转时其临界旋转频率大约为90Hz，按100Hz以上频率旋转时，便不能实现稳定的重放，或噪声大小也大到不适的量级。也就是说，CD-ROM盘片驱动装置时的f²×A其最大允许值hc为In the formula, the constant h refers to the magnitude of f ² ×A when the vibration of the chassis base 6 is suppressed to the maximum allowable amount for stable recording or playback. For example, the maximum mass imbalance A of a CD-ROM disc with a diameter of 12 cm is 1 gcm. In the existing disc drive device, when the disc with the mass imbalance A of 1 g cm rotates, its critical rotation frequency is about 90 Hz. According to 100 Hz When the above frequency is rotated, stable playback cannot be achieved, or the noise level is also large to an uncomfortable level. That is to say, the maximum allowable value hc of f ² ×A for CD-ROM disc drive is

hc＝90²×1＝8100gcm/sec²。hc=90 ² ×1=8100 gcm/sec ² .

本发明第一实施例盘片驱动装置中，在例如按100Hz以上频率使质量失衡量A为1gcm的盘片旋转时，由式(7)，8100≧100²×(1-Z)，即In the disk drive device of the first embodiment of the present invention, for example, when the disk whose mass imbalance A is 1gcm is rotated at a frequency above 100 Hz, from formula (7), 8100≧100 ² × (1-Z), namely

Z≧0.19Z≧0.19

也就是说，只要球体24的平衡量Z超过0.19gcm，即便按100Hz使质量失衡量A为1gcm的CD-ROM盘片旋转，也能将底盘座6的振动量抑制到允许值以下。由此，若根据式(6)对球体24的半径r[cm]、比重ρ、个数n、以及中空环状部23的外周内壁面25的半径S[cm]进行设定，以满足球体24的平衡量Z超过0.19gcm的话，便可实现一种盘片驱动装置，即便按100Hz使质量失衡量A为1gcm的盘片旋转，仍然具有充分的抑制振动的效果。That is, as long as the balance Z of the sphere 24 exceeds 0.19 gcm, even if a CD-ROM disc with a mass imbalance A of 1 gcm is rotated at 100 Hz, the vibration of the chassis base 6 can be suppressed below the allowable value. Thus, if the radius r[cm] of the sphere 24, the specific gravity ρ, the number n, and the radius S[cm] of the outer peripheral inner wall surface 25 of the hollow annular portion 23 are set according to formula (6), to satisfy the sphere If the balance amount Z of 24 exceeds 0.19 gcm, it is possible to realize a disk drive device which can sufficiently suppress vibration even when a disk having a mass imbalance amount A of 1 gcm is rotated at 100 Hz.

另外，上述实施例中尽管说明的是12cm直径的CD-ROM盘片，但对于一般采用12cm直径的盘片作为记录媒体时，通过将平衡量Z设定为最大允许值hc低于8100gcm/sec²，来取得优异的抑制振动的效果。而对于直径小于12cm的盘片，当然可通过将平衡量Z设定为最大允许值hc低于8100gcm/sec²，来取得抑制振动的效果。In addition, although the CD-ROM disk with a diameter of 12 cm is described in the above-mentioned embodiment, when a disk with a diameter of 12 cm is generally used as a recording medium, the balance value Z is set to a maximum allowable value hc lower than 8100 gcm/sec ² , to achieve excellent vibration suppression effect. For discs with a diameter of less than 12 cm, of course, the effect of suppressing vibration can be achieved by setting the balance value Z so that the maximum allowable value hc is lower than 8100 gcm/sec ² .

而且，将盘片1旋转频率提高到120Hz时，球体24的平衡量Z由式(7)为And, when the rotation frequency of the disk 1 is increased to 120Hz, the balance Z of the sphere 24 is expressed by the formula (7):

Z≧0.43。Z≧0.43.

因而，可以根据式(6)对球体24的半径r[cm]、比重ρ、个数n、以及中空环状部23的外周内壁面25的半径S[cm]进行设定，以便平衡量Z超过0.43gcm。Therefore, the radius r[cm] of the sphere 24, the specific gravity ρ, the number n, and the radius S[cm] of the outer peripheral inner wall surface 25 of the hollow annular portion 23 can be set according to formula (6), so that the balance quantity Z More than 0.43gcm.

此外，不限于CD-ROM盘片，对于其他盘片也具有相同效果。例如最大质量失衡量A为2gcm盘片时，在未装上球体平衡器22a的状态下，边变化盘片旋转频率，边求得底盘座6振动大小可抑制为能够进行稳定记录或重放的最大允许量的旋转频率f0。接着，求出f0²×A的最大允许值h，由式(7)求得在目标旋转频率f(>f0)情况下利用球体24所需的平衡量Z。最后，根据式(6)对球体24的半径r[cm]、比重ρ、个数n、以及中空环状部23的外周内壁面25的半径S[cm]进行设定，以便得到所需平衡量Z，便可以实现一种即便按目标旋转频率f旋转质量失衡量A为2gcm的盘片，也能够进行稳定记录或重放的盘片驱动装置。In addition, the same effects are not limited to CD-ROM discs, but also to other discs. For example, when the maximum mass imbalance A is a 2gcm disc, in the state where the ball balancer 22a is not installed, the vibration of the chassis base 6 can be suppressed to enable stable recording or playback while changing the disc rotation frequency. Maximum permissible rotation frequency f0. Next, the maximum permissible value h of f0 ² ×A is obtained, and the balance Z required to utilize the sphere 24 is obtained in the case of the target rotation frequency f (>f0) from the formula (7). Finally, according to formula (6), the radius S [cm] of the radius r [cm] of sphere 24, specific gravity ρ, number n, and the outer peripheral inner wall surface 25 of hollow annular portion 23 is set in order to obtain required balance By using the quantity Z, it is possible to realize a disk drive device capable of stably recording or reproducing even when a disk whose mass imbalance A is 2 gcm is rotated at the target rotation frequency f.

此外，本发明第一实施例中，球体24的半径r[cm]、个数n、以及中空环状部23的外周内壁面25的半径S[cm]设定为满足下式：In addition, in the first embodiment of the present invention, the radius r [cm] of the sphere 24, the number n, and the radius S [cm] of the outer peripheral inner wall surface 25 of the hollow annular portion 23 are set to satisfy the following formula:

r/(S-r)≦sin{π/(2n)} …(8)r/(S-r)≦sin{π/(2n)} …(8)

此公式使球体24的个数为最理想。This formula makes the number of spheres 24 optimal.

对式(8)进行变形，便为Transforming formula (8), it becomes

n≦π/2/sin^-1{r/(S-r)} …(9)n≦π/2/sin ^-1 {r/(Sr)} …(9)

这意味着，当球体24的半径r[cm]和中空环状部23的外周内壁面25的半径S[cm]确定时，球体24个数n的最大值如式(9)所示。This means that when the radius r [cm] of the sphere 24 and the radius S [cm] of the outer peripheral inner wall surface 25 of the hollow annular portion 23 are determined, the maximum value of the number n of the spheres 24 is as shown in formula (9).

另外，利用球体24产生的平衡量Z的大小可由上述式(6)得到。由式(6)平衡量Z的最大值Zmax为n sin^-1{r/(S-r)}＝π/2时，即满足下式时In addition, the magnitude of the balance amount Z generated by the spherical body 24 can be obtained from the above-mentioned formula (6). According to formula (6), when the maximum value Zmax of the balance quantity Z is n sin ^-1 {r/(Sr)}=π/2, that is, when the following formula is satisfied

n＝π/2/sin^-1{r/(S-r)} …(10)n=π/2/sin ^-1 {r/(Sr)} …(10)

可求得：can be obtained:

Zmax＝4/3πr²ρ(S-r)² …(11)Zmax＝4/3πr ² ρ(Sr) ² …(11)

若球体24的个数n比式(10)计算出的值多，平衡量Z就比式11示出的Zmax小，但可以由式(6)表示。具体来说，球体24的个数n希望设定为满足式(9)的个数。这样设定的话，球体24的半径r[cm]、中空环状部23的外周内壁面25的半径S[cm]确定时，可以防止将球体24的个数n设定得太多，超出所需值，从而可以按最理想个数得到所需的平衡量Z。If the number n of spheres 24 is greater than the value calculated by Equation (10), the balance amount Z will be smaller than Zmax shown by Equation 11, but can be expressed by Equation (6). Specifically, the number n of spheres 24 is desirably set to a number satisfying the expression (9). If it is set like this, when the radius r [cm] of the sphere 24 and the radius S [cm] of the outer peripheral inner wall surface 25 of the hollow annular portion 23 are determined, the number n of the sphere 24 can be prevented from being set too much, exceeding the specified value. The required value, so that the required balance quantity Z can be obtained according to the optimal number.

另外，第一实施例中，因隔振子7形变所造成的底盘座6的机械振动当中与盘片1的记录面相平行方向上的一次谐振频率，设定为低于盘片1的旋转频率。这是因为失衡力F产生的振动位移方向与失衡力F的作用方向基本上相反。In addition, in the first embodiment, the primary resonance frequency in the direction parallel to the recording surface of the disk 1 among the mechanical vibrations of the chassis base 6 caused by the deformation of the vibrator 7 is set to be lower than the rotation frequency of the disk 1. This is because the direction of the vibration displacement generated by the unbalanced force F is basically opposite to the acting direction of the unbalanced force F.

一般来说，由弹簧和质量构成的机械振动系统中，在其谐振频率附近，作用于质量的外力频率和外力造成的位移频率其相位开始偏移。而且，对于比谐振频率高得多的频率来说，它们的相位差大致为电气角180度，外力的作用方向和位移方向相反。也就是说，若将底盘座6的谐振频率设定为低于盘片1旋转频率，而且失衡力F产生的振动位移方向和失衡力F作用方向大致相反的频率的话，球体24便如前文所述集中于与盘片1重心G1大致相对的位置上。而且，令作用于各个球体24的离心力q在失衡力F相同方向上的分力为平衡力zk的话，平衡力zk的合力Zn的作用方向和失衡力作用方向大致呈相反方向。因而，底盘座6的谐振频率最好考虑盘片1旋转频率的失衡力F所产生的振动位移的方向来设定。Generally speaking, in a mechanical vibration system composed of a spring and a mass, the phase of the external force frequency acting on the mass and the displacement frequency caused by the external force begins to shift near its resonance frequency. Moreover, for frequencies much higher than the resonant frequency, their phase difference is roughly 180 degrees in electrical angle, and the acting direction of the external force is opposite to the direction of displacement. That is to say, if the resonant frequency of the chassis base 6 is set to be lower than the rotation frequency of the disc 1, and the vibration displacement direction generated by the unbalanced force F is substantially opposite to the direction of the unbalanced force F, the sphere 24 will be as described above. The above is concentrated on the position approximately opposite to the center of gravity G1 of the disk 1 . Moreover, if the component force of the centrifugal force q acting on each spherical body 24 in the same direction as the unbalanced force F is the balance force zk, the acting direction of the resultant force Zn of the balanced force zk is substantially opposite to the acting direction of the unbalanced force. Therefore, the resonance frequency of the chassis base 6 is preferably set in consideration of the direction of the vibration displacement generated by the unbalanced force F of the rotation frequency of the disk 1 .

图3示出的是底盘座6振动加速度的实测值，是利用质量失衡量A约1gcm的盘片1调查第一实施例盘片驱动装置效果的实验结果。另外，该实验中，加速度传感器采用ENDEVCO(美国加州)制的ACCELEROMETER MODEL 2250A-10，加速度传感器用放大器采用ENDEVCO(美国加州)制的ISOTRON AMPLIFIER MODEL 102。FIG. 3 shows the measured values of the vibration acceleration of the chassis base 6, which is the experimental result of investigating the effect of the disk drive device of the first embodiment using the disk 1 with the mass imbalance A of about 1 gcm. In addition, in this experiment, ACCELEROMETER MODEL 2250A-10 manufactured by ENDEVCO (California, USA) was used for the acceleration sensor, and ISOTRON AMPLIFIER MODEL 102 manufactured by ENDEVCO (California, USA) was used for the amplifier for the acceleration sensor.

该实验中，对按约100Hz旋转盘片1时的底盘座6的振动加速度进行实际测定。图3(a)示出的是现有盘片驱动装置没有球体平衡器的场合。如图3(a)所示，现有盘片驱动装置中按最大约8G加速度振动。图3(b)示出的是本发明第一实施例盘片驱动装置的场合，振动加速度可抑制至约3G。In this experiment, the vibration acceleration of the chassis base 6 when the disk 1 was rotated at about 100 Hz was actually measured. FIG. 3(a) shows the situation where the conventional disk drive device does not have a ball balancer. As shown in FIG. 3(a), conventional disk drives vibrate at a maximum acceleration of about 8G. FIG. 3(b) shows that in the case of the disk drive device according to the first embodiment of the present invention, the vibration acceleration can be suppressed to about 3G.

这样，第一实施例盘片驱动装置便可大幅抑制振动加速度，因而失衡力F对主轴电动机2轴承的侧压减小，可解决轴损转矩增大，造成轴承损伤、和轴承寿命缩短这些问题。In this way, the disk drive device of the first embodiment can greatly suppress the vibration acceleration, so the lateral pressure of the unbalanced force F on the bearing of the spindle motor 2 is reduced, which can solve the problems of increased shaft loss torque, bearing damage, and shortened bearing life. question.

综上所述，利用第一实施例的盘片驱动装置构成，不论所装上的盘片1的质量失衡量A或盘片1的旋转频率如何，均可以确实地抑制底盘座6的振动。因此，第一实施例盘片驱动装置，即便高速旋转远达不到平衡的盘片1，也可以实现能稳定地进行记录或重放，能够高速旋转的盘片驱动装置。In summary, with the configuration of the disk drive device of the first embodiment, the vibration of the chassis base 6 can be reliably suppressed regardless of the mass imbalance A of the mounted disk 1 or the rotational frequency of the disk 1 . Therefore, in the disk drive device of the first embodiment, even if the disk 1 rotates at a high speed which is far from being balanced, it can stably perform recording or playback, and can realize a high-speed rotation disk drive device.

《第二实施例》"Second Embodiment"

以下参照附图说明本发明第二实施例的盘片驱动装置。图4是示意本发明第二实施例盘片驱动装置中主轴电动机2周围的侧视剖面图。另外，对于与上述图1中所示的第一实施例盘片驱动装置中的组成部分实际相同的组成部分，加上相同标号，并引用先前实施例的说明以省略重复的说明。A disk drive device according to a second embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a side sectional view showing the surroundings of the spindle motor 2 in the disk drive apparatus according to the second embodiment of the present invention. In addition, the same reference numerals are attached to the components that are substantially the same as those in the disk drive apparatus of the first embodiment shown in FIG. 1 above, and the descriptions of the previous embodiments are referred to to omit repeated descriptions.

本发明第二实施例的盘片驱动装置，与上述第一实施例相同，具有一中空环状部23，为具有环状通路以便内部容纳球体24的环状轨道部。第二实施例的盘片驱动装置中，若以转台110上保持的盘片1的记录面为基准面的话，设置为可与转子80一体旋转的球体平衡器22b，相对于该基准面配置在与读写头3相同一侧。The disk drive device of the second embodiment of the present invention is the same as the above-mentioned first embodiment, and has a hollow ring portion 23, which is a ring-shaped track portion having a ring-shaped passage for accommodating a ball 24 inside. In the disk drive device of the second embodiment, if the recording surface of the disk 1 held on the turntable 110 is used as a reference plane, the ball balancer 22b provided to rotate integrally with the rotor 80 is arranged at On the same side as the read/write head 3.

如图4所示，第二实施例中的中空环状部23的外周外壁面102的半径，设定成小于读写头3位于最内周记录轨117时读写头3内周一侧端面103的半径。其他构成与上述第一实施例的构成相同。As shown in FIG. 4 , the radius of the outer peripheral wall surface 102 of the hollow annular portion 23 in the second embodiment is set to be smaller than the end surface 103 of the inner peripheral side of the head 3 when the head 3 is located at the innermost recording track 117 of the radius. Other configurations are the same as those of the first embodiment described above.

这样构成的第二实施例的盘片驱动装置中，球体平衡器22b的动作与上述第一实施例的球体平衡器22a相同，可利用上述构成确实地抑制盘片1质量失衡量所产生的底盘座6的振动。In the disk drive device of the second embodiment thus constituted, the action of the ball balancer 22b is the same as that of the ball balancer 22a of the above-mentioned first embodiment, and the chassis caused by the mass imbalance of the disk 1 can be reliably suppressed by the above-mentioned structure. Seat 6 vibrations.

而且，本发明的第二实施例盘片驱动装置中，若以转台110上保持的盘片1的记录面为基准面的话，球体平衡器22b相对于该基准面配置于与读写头3相同一侧，因而球体平衡器22b不占据盘片1上方空间，可实现装置薄型化。Moreover, in the disk drive device of the second embodiment of the present invention, if the recording surface of the disk 1 held on the turntable 110 is used as a reference plane, the ball balancer 22b is arranged at the same position as the head 3 with respect to the reference plane. Therefore, the ball balancer 22b does not occupy the space above the disk 1, and the device can be thinned.

此外，通过将中空环状部23的外周外壁面102的半径，设定为比读写头3位于最内周记录轨117时读写头3内周一侧端面103的半径小，可以与读写头3并排配置球体平衡器22b。由此，若以盘片1的记录面为基准面的话，即便在相对于该基准面与读写头3相同的空间，球体平衡器22b也不会另外占据空间，即便装上球体平衡器22b，也可以实现装置薄型化。In addition, by setting the radius of the outer peripheral wall surface 102 of the hollow annular portion 23 to be smaller than the radius of the end surface 103 on the inner peripheral side of the head 3 when the head 3 is located at the innermost recording track 117, it can be compared with the read-write head 3. The head 3 arranges the ball balancer 22b side by side. Thus, if the recording surface of the disc 1 is used as the reference plane, even in the same space as the head 3 with respect to the reference plane, the ball balancer 22b will not occupy additional space. , can also achieve device thinning.

另外，本发明第二实施例的盘片驱动装置中，需要减小中空环状部23外周内壁面25的半径S，但与上述第一实施例相同，球体24的半径r[cm]、比重ρ、个数n、以及中空环状部23的外周内壁面25的半径S[cm]满足上述式(6)、式(7)和式(8)的话，便可获得充分的振动抑制效果。例如为CD-ROM盘片时，最内周记录轨117的半径为2.3cm，12cm直径的CD-ROM盘片其质量失衡量A最大为1gcm大小。如前文所述，对于现有的盘片驱动装置，质量失衡量A为1gcm的盘片旋转时，其临界旋转频率大体为90Hz。因而，CD-ROM盘片驱动装置场合f²A的最大允许值hc为：In addition, in the disk drive device of the second embodiment of the present invention, it is necessary to reduce the radius S of the inner wall surface 25 of the outer periphery of the hollow annular portion 23, but the same as the above-mentioned first embodiment, the radius r [cm] of the spherical body 24, the specific gravity If ρ, the number n, and the radius S [cm] of the outer peripheral inner wall surface 25 of the hollow annular portion 23 satisfy the above formulas (6), (7) and (8), a sufficient vibration suppression effect can be obtained. For example, in the case of a CD-ROM disc, the radius of the innermost recording track 117 is 2.3 cm, and the mass imbalance A of a CD-ROM disc with a diameter of 12 cm is at most 1 gcm. As mentioned above, for the conventional disk drive device, when the disk with mass imbalance A of 1 gcm rotates, its critical rotation frequency is approximately 90 Hz. Therefore, the maximum permissible value hc of f ² A in the case of CD-ROM disk drives is:

hc＝90²×1＝8100gcm/sec² hc＝ ⁹⁰² ×1＝8100gcm/ ^sec2

这里，对于本发明第二实施例的盘片驱动装置，也按120Hz以上频率使例如质量失衡量A为1gcm的盘片旋转时，由式(7)为：Here, for the disc drive device of the second embodiment of the present invention, when the disc whose mass imbalance A is 1 gcm is rotated at a frequency above 120 Hz, the formula (7) is:

8100≧120²×(1-Z)8100≧120 ² ×(1-Z)

Z≧0.43Z≧0.43

具体来说，球体24的平衡量Z超过0.43gcm的话，即便按120Hz使质量失衡量A为1gcm的CD-ROM盘片旋转，也可以将底盘座6的振动量减小到允许值以下。Specifically, if the balance Z of the sphere 24 exceeds 0.43 gcm, even if a CD-ROM disc having a mass imbalance A of 1 gcm is rotated at 120 Hz, the vibration of the chassis base 6 can be reduced below the allowable value.

CD-ROM盘片重放用读写头3的透镜104的中心距读写头3内周一侧端面103的距离一般为0.7cm，读写头3内周一侧端面103和中空环状部23的外周外壁面102间的宽裕量为0.1cm。而用树脂制材料形成中空环状部23外周壁时，若令其厚度为0.1cm的话，中空环状部23外周的内壁面25的半径S[cm]则为：The distance between the center of the lens 104 of the read-write head 3 for CD-ROM disc playback is generally 0.7 cm from the end face 103 of the inner circumference of the head 3, and the distance between the end face 103 of the inner circumference of the head 3 and the hollow annular portion 23 The margin between the outer peripheral wall surfaces 102 is 0.1 cm. And when forming the outer peripheral wall of the hollow annular portion 23 with a resin material, if its thickness is 0.1 cm, the radius S [cm] of the inner wall surface 25 of the outer periphery of the hollow annular portion 23 is:

S＝2.3-0.7-0.1-0.1＝1.4cmS=2.3-0.7-0.1-0.1=1.4cm

另外，读写头3位于最内周记录轨117时，读写头3的透镜104的中心距主轴电动机2轴心的距离为2.3cm。In addition, when the head 3 is located on the innermost recording track 117 , the distance between the center of the lens 104 of the head 3 and the axis of the spindle motor 2 is 2.3 cm.

第二实施例中，若所用球体24是比重ρ约为7.8、半径r[cm]为0.1cm的钢球的话，利用上述式(8)变形得到的式(9)求出球体24最大个数n，便由In the second embodiment, if the sphere 24 used is a steel ball with a specific gravity ρ of about 7.8 and a radius r [cm] of 0.1 cm, the maximum number of spheres 24 can be obtained by using the formula (9) obtained by the deformation of the above formula (8) n, then by

n≦π/2/sin^-1{0.1/(1.4-0.1)}n≦π/2/sin ^-1 {0.1/(1.4-0.1)}

n≦20个n≦20

将球体24的个数设定为最大的20个，并将半径r＝0.1cm、比重ρ＝7.8、n＝13、S＝1.4cm代入式(6)的话，则The number of spheres 24 is set to the maximum 20, and if the radius r=0.1cm, specific gravity ρ=7.8, n=13, S=1.4cm are substituted into formula (6), then

Z＝0.55gcmZ=0.55gcm

球体24的个数n设定为最大的20个的话，球体24的平衡量Z便满足所需的0.43gcm以上。If the number n of spheres 24 is set to the maximum of 20, the balance Z of spheres 24 satisfies the required 0.43 gcm or more.

接下来，利用式(6)减少球体24的个数来求得平衡量的话，若个数n减少到12个的话，平衡量Z便为0.44gcm。所以，利用半径r[cm]为0.1cm的钢球，并使得球体24的个数n为12个以上、20个以下的话，便可以实现一种即便按120Hz旋转质量失衡量A为1gcm的盘片，仍具有充分振动抑制效果的薄型盘片驱动装置。Next, if the balance quantity is obtained by reducing the number of spheres 24 using formula (6), if the number n is reduced to 12, the balance quantity Z is 0.44 gcm. Therefore, if steel balls with a radius r [cm] of 0.1 cm are used, and the number n of balls 24 is 12 or more and 20 or less, a disc with a mass imbalance A of 1 gcm can be realized even at 120 Hz rotation. A thin disc drive unit that still has sufficient vibration suppression effect.

综上所述，利用第二实施例的盘片驱动装置构成，可以在避免装置厚度增加的情况下，在所装上的盘片1的质量失衡量A较大时仍可以确实地抑制底盘座6的振动。因此，第二实施例盘片驱动装置，即便高速旋转远达不到平衡的盘片1，也可以实现能稳定地进行记录或重放，能够高速旋转并且为薄型的盘片驱动装置。To sum up, with the configuration of the disk drive device of the second embodiment, it is possible to reliably restrain the chassis seat when the mass imbalance A of the mounted disk 1 is large while avoiding an increase in the thickness of the device. 6 vibrations. Therefore, the disc drive device of the second embodiment can stably perform recording or playback even if the disc 1 rotates at a high speed which is far from balanced.

《第三实施例》"Third Embodiment"

以下参照附图说明本发明第三实施例的盘片驱动装置。图5是示意本发明第三实施例盘片驱动装置中主轴电动机2周围的侧视剖面图。另外，对于与上述第一实施例和第二实施例盘片驱动装置中的组成部分实际相同的组成部分，加上相同标号，并引用先前实施例的说明以省略重复的说明。A disk drive device according to a third embodiment of the present invention will be described below with reference to the drawings. FIG. 5 is a side sectional view showing the surroundings of the spindle motor 2 in the disk drive apparatus according to the third embodiment of the present invention. In addition, the components that are substantially the same as those in the disk drive apparatus of the first and second embodiments described above are given the same reference numerals, and the descriptions of the previous embodiments are referred to to omit repeated descriptions.

本发明第三实施例的盘片驱动装置中，如图5所示，与上述第一实施例相同，形成有球体平衡器22a，能够与主轴电动机2的转子80一体旋转。球体平衡器22a具有以下构成：具有与主轴电动机2的主轴21同轴设置的环状通路而成为环状轨道部的中空环状部23；以及可移动地容纳在中空环状部23通路内的多个球体24。In the disk drive device according to the third embodiment of the present invention, as shown in FIG. 5, a ball balancer 22a is formed to rotate integrally with the rotor 80 of the spindle motor 2, as in the above-mentioned first embodiment. The ball balancer 22a has the following configurations: a hollow annular portion 23 that has an annular passage coaxially provided with the main shaft 21 of the spindle motor 2 to form an annular rail portion; A plurality of spheres 24 .

图5中，第三实施例的盘片驱动装置，还构成为靠定位球116压紧并固定转台110上的盘片1，由主轴电动机2旋转驱动。该盘片驱动装置中，靠读写头(未图示)执行盘片1上所记录数据的读出或对盘片1执行数据写入。通过弹性体40在底盘座6上装配固定主轴电动机2的电动机底座9。此外，底盘座6上还装配有读写头驱动用电动机和读写头驱动机构等。In FIG. 5 , the disk drive device of the third embodiment is further configured to press and fix the disk 1 on the turntable 110 by the positioning ball 116 , and is driven by the spindle motor 2 to rotate. In this disk drive device, data recorded on the disk 1 is read or written into the disk 1 by a head (not shown). The motor base 9 for fixing the spindle motor 2 is assembled on the chassis base 6 through the elastic body 40 . In addition, a head driving motor, a head driving mechanism, and the like are mounted on the chassis base 6 .

如图5所示，底盘座6通过隔振子7装配在主底座8上，可由隔振子7衰减从装置外部传递给底盘座6的振动或冲击。图5所示的盘片驱动装置主体，构成为通过装配在主底座8上的框架(未图示)组装到计算机装置等设备中。As shown in FIG. 5 , the chassis base 6 is assembled on the main base 8 through the vibration isolator 7 , and the vibration or impact transmitted to the chassis base 6 from the outside of the device can be attenuated by the vibration isolator 7 . The main body of the disk drive device shown in FIG. 5 is configured to be incorporated into equipment such as a computer device through a frame (not shown) attached to the main chassis 8 .

第三实施例的盘片驱动装置，为了使电动机底座9与底盘座6联结，采用了刚性低的弹性体40。第三实施例的盘片驱动装置中，因弹性体40形变所造成的电动机底座9的机械振动与盘片1记录面相平行方向上的一次谐振频率，设定得低于盘片1的旋转频率。具体来说，盘片1的旋转频率为100Hz。而读写头由读写头驱动机构所驱动方向(跟随方向)上的电动机底座9振动的一次谐振频率和与之相正交方向上的电动机底座9振动的一次谐振频率均设定为大约60Hz。In the disk drive device of the third embodiment, in order to connect the motor base 9 to the chassis base 6, an elastic body 40 with low rigidity is used. In the disk drive device of the third embodiment, the primary resonance frequency of the mechanical vibration of the motor base 9 caused by the deformation of the elastic body 40 and the direction parallel to the recording surface of the disk 1 is set lower than the rotation frequency of the disk 1 . Specifically, the rotation frequency of the disk 1 is 100 Hz. And the primary resonant frequency of the vibration of the motor base 9 on the driven direction (following direction) of the read-write head and the primary resonance frequency of the vibration of the motor base 9 in the direction orthogonal to it are all set to about 60Hz. .

如上所述构成的本发明第三实施例的盘片驱动装置中，利用上述图2和图5说明按100Hz使质量失衡量A较大的盘片1旋转时的动作。In the disk drive apparatus according to the third embodiment of the present invention constituted as described above, the operation when the disk 1 having a large mass imbalance A is rotated at 100 Hz will be described with reference to FIGS. 2 and 5 described above.

首先，盘片1存在离心力(也称为失衡力)F作用于其重心G1，其作用方向随盘片1的旋转而旋转。弹性体40因该失衡力F而发生形变，电动机底座9和该电动机底座9上搭载的主轴电动机2、球体平衡器22a以及盘片1均按盘片1的旋转频率振摆旋转。第三实施例的盘片驱动装置中，因弹性体40形变造成的电动机底座9的谐振频率(约60Hz)设定得低于盘片1的旋转频率(约100Hz)。由此，电动机底座9的位移方向和失衡力F的作用方向通常处于大致相反方向。也就是说，电动机底座9按与失衡力F大致相反相位振摆旋转。Firstly, there is a centrifugal force (also called unbalanced force) F acting on the center of gravity G1 of the disk 1 , and the acting direction of the disk 1 rotates with the rotation of the disk 1 . The elastic body 40 is deformed by the unbalanced force F, and the motor base 9 and the spindle motor 2 mounted on the motor base 9 , the ball balancer 22 a , and the disk 1 all vibrate and rotate at the rotation frequency of the disk 1 . In the disk drive device of the third embodiment, the resonance frequency (about 60 Hz) of the motor base 9 due to the deformation of the elastic body 40 is set lower than the rotation frequency of the disk 1 (about 100 Hz). Accordingly, the displacement direction of the motor base 9 and the acting direction of the unbalanced force F are generally in substantially opposite directions. That is, the motor base 9 vibrates in substantially the opposite phase to the unbalanced force F. As shown in FIG.

因而，与图2所示的上述第一实施例相同，电动机底座9上旋转的盘片1的振摆旋转的中心轴P1，配置在失衡力F作用的盘片1的重心G1和主轴电动机旋转中心轴P0之间。Therefore, similar to the above-mentioned first embodiment shown in FIG. 2 , the center axis P1 of the vibrating rotation of the disk 1 rotating on the motor base 9 is arranged between the center of gravity G1 of the disk 1 on which the unbalanced force F acts and the rotation of the spindle motor. Between the central axis P0.

此时，中空环状部23中容纳的球体24存在振摆旋转中心轴P1和球体24重心之间连线方向上的离心力q的作用。而且，球体24通过中空环状部23外周的内壁面25约束其移动，因此有外周内壁面25的支持力N作用于球体24上。来自该外周内壁面25的支持力N作用于朝向外周内壁面25的中心P2的方向。由此，在以外周内壁面25中心P2为中心通过球体24重心的圆周切线方向上，并远离振摆旋转中心轴P1的方向上存在作为离心力q和支持力N的合力的移动力R作用于球体24上。球体24靠该移动力R沿外周内壁面25移动，夹着振摆旋转的中心轴P1，向与盘片1的重心G1大致完全相对的位置集中。At this time, the spherical body 24 accommodated in the hollow annular portion 23 acts on the centrifugal force q in the direction of the line between the center axis of vibration P1 and the center of gravity of the spherical body 24 . Furthermore, the movement of the ball 24 is constrained by the inner wall surface 25 on the outer periphery of the hollow annular portion 23 , so the supporting force N of the inner wall surface 25 on the outer periphery acts on the ball 24 . The supporting force N from the outer peripheral inner wall surface 25 acts in a direction toward the center P2 of the outer peripheral inner wall surface 25 . Thus, in the direction of the tangential line passing through the center of gravity of the sphere 24 centered on the center P2 of the outer peripheral inner wall surface 25, and in the direction away from the center axis P1 of the vibrating rotation, there is a moving force R acting as the resultant force of the centrifugal force q and the supporting force N. Sphere 24. The spheres 24 move along the outer peripheral inner wall surface 25 by this moving force R, and gather at a position substantially completely opposite to the center of gravity G1 of the disk 1 across the center axis P1 of the oscillating rotation.

因此，令作用于集中好的各个球体24的离心力q在失衡力相同方向上的分力为平衡力zk的话，可利用该平衡力zk的合力Zn来抵消盘片1旋转所产生的失衡力F，作用于电动机底座9的力减小。因而，即便旋转失衡盘片1也可抑制电动机底座9的振动，还可抑制电动机底座9所装上的盘片1的振动。而且，传递给通过弹性体40与电动机底座9联结的底盘座6的振动也减小，底盘座6上搭载的读写头3的振动也受到抑制。Therefore, if the component force of the centrifugal force q acting on each concentrated ball 24 in the same direction as the unbalanced force is the balance force zk, the resultant force Zn of the balance force zk can be used to offset the unbalanced force F generated by the rotation of the disk 1 , the force acting on the motor base 9 decreases. Therefore, even if the disk 1 rotates out of balance, the vibration of the motor base 9 can be suppressed, and the vibration of the disk 1 mounted on the motor base 9 can also be suppressed. Furthermore, the vibration transmitted to the chassis base 6 connected to the motor base 9 through the elastic body 40 is also reduced, and the vibration of the head 3 mounted on the chassis base 6 is also suppressed.

上述第一实施例中，通过将隔振子7形变产生的底盘座6的谐振频率(约60Hz)设定得比盘片1旋转频率(约100Hz)低，来实现中空环状部23按与失衡力F大致相反相位振摆旋转。而本发明第三实施例的盘片驱动装置中，电动机底座9通过弹性体40装配在底盘座6上，并通过将弹性体40形变产生的电动机底座9的谐振频率(约60Hz)设定得比盘片1旋转频率(约100Hz)低，来实现中空环状部23按与失衡力F大致相反相位振摆旋转。通过这样构成，球体24与上述第一实施例相同，可确实向与盘片1重心G1大致完全相对的位置集中，可利用球体24确实消除盘片1的质量失衡量。In the above-mentioned first embodiment, by setting the resonance frequency (about 60 Hz) of the chassis base 6 generated by the deformation of the vibrator 7 to be lower than the rotation frequency (about 100 Hz) of the disk 1, the hollow annular portion 23 is pressed and unbalanced The force F vibrates in roughly opposite phase. In the disk drive device of the third embodiment of the present invention, the motor base 9 is assembled on the chassis seat 6 through the elastic body 40, and the resonance frequency (about 60 Hz) of the motor base 9 generated by the deformation of the elastic body 40 is set to Lower than the rotation frequency of the disk 1 (approximately 100 Hz), the hollow ring-shaped portion 23 is realized to vibrate in a substantially opposite phase to the unbalanced force F. With this configuration, the spheres 24 can surely be concentrated at a position substantially completely opposite to the center of gravity G1 of the disk 1, as in the above-mentioned first embodiment, and the mass imbalance of the disk 1 can be surely eliminated by the spheres 24 .

为了提高本发明球体平衡器抑制振动的效果，最好使球体24正确集中于与盘片1重心G1大致完全相对的位置上，使中空环状部23的振摆旋转和失衡力F其各自的作用方向尽可能接近相反相位，此外使得中空环状部23其中心振摆旋转的轨迹处于接近真圆的状态。因此，本发明第三实施例中，为了实现这种最佳的振动状态，另外设置了弹性体40。而且，第三实施例可以比由隔振子7兼顾实现上述振动状态和衰减装置外部传递给底盘座6的振动或冲击这两者的上述第一实施例更为容易地实现最佳状态。例如将电动机底座9的形状设定为在主轴电动机2的旋转中心轴P0上配置电动机底座9以及电动机底座9上搭载的主轴电动机2其整体重心，并且距旋转中心轴P0相同半径上按相等角间隔配置3～4个弹性体40的话，便可以使进行振摆旋转的电动机底座9上搭载的构成部件其整体重心和弹性体40支持中心两者均位于主轴电动机2旋转中心轴P0上。因而，利用第三实施例，可以使失衡力F所产生的中空环状部23其中心的振摆旋转轨迹大致为真圆。In order to improve the effect of suppressing vibration of the ball balancer of the present invention, it is preferable to make the ball 24 be correctly concentrated on the position substantially completely opposite to the center of gravity G1 of the disc 1, so that the swinging rotation of the hollow ring-shaped part 23 and the unbalanced force F are their respective The direction of action is as close to the opposite phase as possible, and in addition, the locus of the center oscillation of the hollow ring portion 23 is in a state close to a true circle. Therefore, in the third embodiment of the present invention, in order to realize this optimal vibration state, an elastic body 40 is additionally provided. Moreover, the third embodiment can achieve the optimal state more easily than the above-mentioned first embodiment in which both the above-mentioned vibration state and the vibration or impact transmitted to the chassis base 6 from the outside of the damping device are achieved by the vibration isolator 7 . For example, the shape of the motor base 9 is set such that the center of gravity of the motor base 9 and the overall center of gravity of the spindle motor 2 mounted on the motor base 9 is arranged on the rotation center axis P0 of the spindle motor 2, and the motor base 9 is set at the same radius from the rotation center axis P0 at equal angles. By arranging three to four elastic bodies 40 at intervals, both the center of gravity of the components mounted on the vibrating motor base 9 and the supporting center of the elastic bodies 40 can be located on the rotation center axis P0 of the spindle motor 2 . Therefore, according to the third embodiment, the locus of the center of the hollow annular portion 23 generated by the unbalanced force F can be made substantially a true circle.

此外，第三实施例盘片驱动装置，还容易使弹性体40的刚性为所希望的大小，以便中空环状部23的振摆旋转和失衡力F作用方向大致为相反相位，而且还可通过使弹性体40在旋转中心轴P0方向上的刚性和与之正交方向上的刚性为最佳，从而只产生振摆旋转这种振动方式。In addition, in the disk drive device of the third embodiment, it is easy to make the rigidity of the elastic body 40 a desired value, so that the vibration direction of the hollow annular portion 23 and the direction of the unbalanced force F are approximately in opposite phases, and it can also be achieved by The rigidity of the elastic body 40 in the direction of the rotation center axis P0 and the rigidity in the direction perpendicular thereto are optimized, so that only vibrations such as wobbling and rotation are generated.

综上所述，利用第三实施例盘片驱动装置的构成，可容易实现用以进一步提高球体平衡器22a抑制振动效果的最佳振动状态，而且即便是所装上的盘片1其质量失衡量较大时，也可以确实抑制电动机底座9和底盘座6的振动。因此，第三实施例的盘片驱动装置，即便高速旋转质量平衡量远达不到平衡的盘片1，也可以实现能稳定地进行记录或重放，能够高速旋转的盘片驱动装置。In summary, with the configuration of the disk drive device in the third embodiment, the optimal vibration state for further improving the vibration suppression effect of the ball balancer 22a can be easily realized, and even if the mass of the mounted disk 1 is out of balance When the amount is large, the vibration of the motor base 9 and the chassis base 6 can also be reliably suppressed. Therefore, the disk drive device of the third embodiment can realize a disk drive device capable of recording or reproducing stably and rotating at a high speed even if the disk 1 whose mass balance is far below the balance is rotated at high speed.

《第四实施例》"Fourth Embodiment"

接着参照附图说明本发明第四实施例的盘片驱动装置。图6是示意本发明第四实施例盘片驱动装置中与转子80一体设置的平衡器22c的平面剖面图。另外，对于与上述第一实施例盘片驱动装置中的组成部分实际相同的组成部分，加上相同标号，并引用先前实施例的说明以省略重复的说明。Next, a disk drive device according to a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a plan sectional view showing a balancer 22c integrally provided with a rotor 80 in a disk drive device according to a fourth embodiment of the present invention. In addition, the components that are actually the same as those in the disk drive apparatus of the above-mentioned first embodiment are given the same reference numerals, and the descriptions of the previous embodiments are referred to to omit repeated descriptions.

本发明第四实施例的盘片驱动装置如图6所示，与上述第一实施例相同，可与主轴电动机2的转子80一体旋转形成有球体平衡器22c。该球体平衡器22c由成为与主轴电动机2的主轴21同轴设置的环状轨道部的中空环状部23c和可移动地容纳于该中空环状部23c内部的多个球体24所构成。As shown in FIG. 6 , the disc drive device according to the fourth embodiment of the present invention is the same as the above-mentioned first embodiment, and a ball balancer 22 c is formed which can rotate integrally with the rotor 80 of the spindle motor 2 . The ball balancer 22c is composed of a hollow annular portion 23c serving as an annular rail portion provided coaxially with the main shaft 21 of the spindle motor 2, and a plurality of balls 24 movably housed inside the hollow annular portion 23c.

而且，本发明第四实施例的盘片驱动装置中，球体平衡器22c的中空环状部23c外周的内壁面25c相对于中空环状部23c中心轴(图6中P2)倾斜。上述以外构成与上述第一实施例相同。Furthermore, in the disk drive device according to the fourth embodiment of the present invention, the inner wall surface 25c of the outer periphery of the hollow annular portion 23c of the ball balancer 22c is inclined relative to the central axis (P2 in FIG. 6 ) of the hollow annular portion 23c. The configuration other than the above is the same as that of the above-mentioned first embodiment.

如上所述构成的第四实施例盘片驱动装置中，在旋转质量失衡量A较大的盘片1时，与图2所示的上述第一实施例相同，中空环状部23c以振摆旋转中心轴P1为中心进行振摆旋转动作。In the disk drive device of the fourth embodiment constructed as described above, when the disk 1 having a large mass imbalance A is rotated, the hollow annular portion 23c vibrates in the same manner as in the above-mentioned first embodiment shown in FIG. 2 . Vibrating rotation is performed around the rotation center axis P1.

此时，中空环状部23c中容纳的球体24存在振摆旋转中心轴P1和球体24重心之间连线方向上的离心力q作用。而且，球体24通过中空环状部23外周的内壁面25c约束其移动，因此有外周内壁面25的支持力N作用于球体24上。如图6所示，来自该外周内壁面25的支持力N垂直作用于外周内壁面25c，因而具有指向中空环状部23c中心P2方向上的分力N1和与中空环状部23c中心轴P2相平行方向上的分力N2。因此，如图2所示，在以外周内壁面25c中心P2为中心通过球体24重心的圆周切线方向上，并远离振摆旋转中心轴P1的方向上存在作为离心力q和支持力N其分力N1的合力的移动力R作用于球体24上。球体24靠该移动力R沿外周内壁面25c移动，夹着振摆旋转的中心轴P1，向与盘片1的重心G1大致完全相对的位置集中。At this time, the spherical body 24 accommodated in the hollow annular portion 23 c acts on the centrifugal force q in the direction of the line between the center axis of vibration P1 and the center of gravity of the spherical body 24 . Furthermore, the movement of the ball 24 is restricted by the inner wall surface 25 c on the outer periphery of the hollow annular portion 23 , so the support force N of the inner wall surface 25 on the outer periphery acts on the ball 24 . As shown in FIG. 6, the supporting force N from the outer peripheral inner wall surface 25 acts perpendicularly on the outer peripheral inner wall surface 25c, thus having a component force N1 directed to the center P2 of the hollow annular portion 23c and a central axis P2 of the hollow annular portion 23c. The component force N2 in the parallel direction. Therefore, as shown in FIG. 2, in the direction of the circumferential tangent line passing through the center of gravity of the sphere 24 around the center P2 of the outer peripheral inner wall surface 25c, and in the direction away from the vibrational rotation center axis P1, there are components of the centrifugal force q and the support force N. The moving force R of the resultant force of N1 acts on the ball 24 . The spheres 24 move along the outer peripheral inner wall surface 25c by this moving force R, and gather at a position almost completely opposite to the center of gravity G1 of the disk 1 across the center axis P1 of the oscillating rotation.

因此，令作用于集中好的各个球体24的离心力q在失衡力相同方向上的分力为平衡力zk的话，可利用平衡力zk的合力Zn来抵消盘片1旋转所产生的失衡力F，作用于底盘座6的力便减小。因而，旋转失衡盘片1时产生的底盘座6的振动便受到抑制。Therefore, if the component force of the centrifugal force q acting on each concentrated ball 24 in the same direction as the unbalanced force is the balance force zk, the resultant force Zn of the balance force zk can be used to offset the unbalanced force F generated by the rotation of the disc 1, Acting on the power of chassis base 6 just reduces. Accordingly, the vibration of the chassis base 6 generated when the unbalanced disk 1 is rotated is suppressed.

此外，球体24由支持力N的分力N2压紧在中空环状部23c的底面上。因而，即便从装置外部加上中空环状部23c中心轴P2方向上的振动或冲击，球体24仍由支持力N的分力N2维持与中空环状部23c底面碰接的状态。因此，第四实施例中可以避免球体24在中空环状部23c的内部与中空环状部23c中心轴P2相平行方向上跳动，从而避免球体24冲击中空环状部23c顶面或底面而产生噪声这种问题。Further, the ball 24 is pressed against the bottom surface of the hollow annular portion 23c by the component force N2 of the support force N. As shown in FIG. Therefore, even if vibration or impact in the direction of the central axis P2 of the hollow annular portion 23c is applied from outside the device, the ball 24 remains in contact with the bottom surface of the hollow annular portion 23c by the component force N2 of the supporting force N. Therefore, in the fourth embodiment, it is possible to prevent the ball 24 from bouncing in the direction parallel to the central axis P2 of the hollow ring-shaped part 23c inside the hollow ring-shaped part 23c, thereby avoiding the impact of the ball 24 on the top or bottom surface of the hollow ring-shaped part 23c. The problem of noise.

综上所述，利用本发明第四实施例的构成，可以靠球体平衡器22c抑制底盘座6的振动，而且可以防止球体平衡器22c本身产生的不适噪声。To sum up, with the structure of the fourth embodiment of the present invention, the vibration of the chassis base 6 can be suppressed by the ball balancer 22c, and the uncomfortable noise generated by the ball balancer 22c itself can be prevented.

《第五实施例》"Fifth Embodiment"

接着参照附图说明本发明第五实施例的盘片驱动装置。图7是示意本发明第五实施例盘片驱动装置中与转子80一体设置的具有中空环状部23d的球体平衡器22d的平面剖面图。另外，对于与上述第一实施例盘片驱动装置中的组成部分实际相同的组成部分，加上相同标号，并引用先前实施例的说明以省略重复的说明。Next, a disk drive device according to a fifth embodiment of the present invention will be described with reference to the drawings. 7 is a plan sectional view showing a ball balancer 22d having a hollow annular portion 23d integrally provided with a rotor 80 in a disk drive device according to a fifth embodiment of the present invention. In addition, the components that are actually the same as those in the disk drive apparatus of the above-mentioned first embodiment are given the same reference numerals, and the descriptions of the previous embodiments are referred to to omit repeated descriptions.

本发明第五实施例的盘片驱动装置，与上述第四实施例相同，减小平衡器本身产生噪声的大小。如图6所示，可与主轴电动机2的转子80一体旋转形成球体平衡器22d。该球体平衡器22d由成为与主轴电动机2的主轴21同轴设置的环状轨道部的中空环状部23d和可移动地容纳于该中空环状部23d内部的多个球体24所构成。The disk drive device according to the fifth embodiment of the present invention, like the above-mentioned fourth embodiment, reduces the amount of noise generated by the balancer itself. As shown in FIG. 6 , a ball balancer 22 d is formed that can rotate integrally with the rotor 80 of the spindle motor 2 . The ball balancer 22d is composed of a hollow annular portion 23d serving as an annular rail portion provided coaxially with the main shaft 21 of the spindle motor 2, and a plurality of balls 24 movably housed inside the hollow annular portion 23d.

如图7所示，本发明第五实施例的盘片驱动装置，球体平衡器22d外周的内壁剖面形成为楔形。上述以外构成与上述第一实施例相同。As shown in FIG. 7, in the disk drive device according to the fifth embodiment of the present invention, the cross section of the inner wall of the outer periphery of the ball balancer 22d is formed in a wedge shape. The configuration other than the above is the same as that of the above-mentioned first embodiment.

如上所述构成的第五实施例盘片驱动装置中，在旋转质量失衡量A较大的盘片1时，与图2所示的上述第一实施例相同，中空环状部23d以振摆旋转中心轴P1为中心进行振摆旋转动作。In the disk drive device of the fifth embodiment configured as described above, when the disk 1 having a large mass imbalance A is rotated, the hollow annular portion 23d vibrates in the same manner as in the first embodiment shown in FIG. 2 . Vibrating rotation is performed around the rotation center axis P1.

此时，中空环状部23d中容纳的球体24存在振摆旋转中心轴P1和球体24重心之间连线方向上的离心力q的作用。在此状态下，第五实施例的盘片驱动装置，其中空环状部23d楔形的外周内壁面25d、25e如图7所示，相对于与中空环状部23d的中心轴P2垂直并包含外周内壁面25d、25e中心的面对称形成。因此，球体24可确实地配置在外周内壁面25d、25e的中心，存在来自外周内壁面25d、25e的支持力N3、N4的合力N5作用于球体24。外周内壁面25d、25e相对于与中空环状部23d中心轴P2垂直的面对称形成，因而支持力N5的作用方向为指向中空环状部23d中心P2的方向。因此，在以中空环状部23d中心P2为中心通过球体24重心的圆周切线方向上，并远离振摆旋转中心轴P1的方向上存在作为离心力q和支持力N5的合力的移动力R作用于球体24上。球体24靠该移动力R沿外周内壁面25d、25e移动，夹着振摆旋转的中心轴P1，向与盘片1的重心G1大致完全相对的位置集中。At this time, the spherical body 24 housed in the hollow annular portion 23 d acts on the centrifugal force q in the direction of the line between the center axis of vibration P1 and the center of gravity of the spherical body 24 . In this state, in the disk drive device of the fifth embodiment, the wedge-shaped outer peripheral inner wall surfaces 25d, 25e of the hollow annular portion 23d, as shown in FIG. The plane at the center of the outer peripheral inner wall surfaces 25d, 25e is formed symmetrically. Therefore, the spherical body 24 can be reliably arranged at the center of the outer peripheral inner wall surfaces 25d, 25e, and the resultant force N5 of the supporting forces N3, N4 from the outer peripheral inner wall surfaces 25d, 25e acts on the spherical body 24. The outer peripheral inner wall surfaces 25d, 25e are symmetrically formed with respect to the plane perpendicular to the central axis P2 of the hollow annular portion 23d, so the direction of action of the supporting force N5 is directed toward the center P2 of the hollow annular portion 23d. Therefore, in the direction of the circumferential tangent line passing through the center of gravity of the spherical body 24 around the center P2 of the hollow annular portion 23d, and in the direction away from the vibrating rotation center axis P1, there is a moving force R that is the resultant force of the centrifugal force q and the support force N5 acting on Sphere 24. The ball 24 moves along the outer peripheral inner wall surfaces 25d and 25e by this moving force R, and gathers at a position substantially completely opposite to the center of gravity G1 of the disk 1 across the center axis P1 of the oscillating rotation.

此外，球体24由来自外周内壁面25d、25e的支持力N3、N4在中空环状部23d的中心轴P2方向上的两者分力保持在外周内壁面25d、25e的中心。因而，即便从装置外部加上中空环状部23d中心轴P2平行方向上的振动或冲击，球体24也不会在中空环状部23d内部与中空环状部23d中心轴P2平行方向上转动。所以，第五实施例的盘片驱动装置，可以避免球体24冲击中空环状部23d顶面或底面而产生噪声这种问题。Furthermore, the ball 24 is held at the center of the outer peripheral inner wall surfaces 25d, 25e by both component forces of the support forces N3, N4 from the outer peripheral inner wall surfaces 25d, 25e in the central axis P2 direction of the hollow annular portion 23d. Therefore, even if vibration or impact in the direction parallel to the central axis P2 of the hollow annular portion 23d is applied from outside the device, the ball 24 does not rotate in the direction parallel to the central axis P2 of the hollow annular portion 23d inside the hollow annular portion 23d. Therefore, the disk drive device of the fifth embodiment can avoid the problem of the ball 24 hitting the top surface or the bottom surface of the hollow annular portion 23d to generate noise.

综上所述，利用本发明第五实施例的构成，可以靠球体平衡器22d抑制底盘座6的振动，而且可以防止球体平衡器22d本身产生的不适噪声。To sum up, with the configuration of the fifth embodiment of the present invention, the vibration of the chassis base 6 can be suppressed by the ball balancer 22d, and uncomfortable noise generated by the ball balancer 22d itself can be prevented.

《第六实施例》"Sixth Embodiment"

接着参照附图说明本发明第六实施例的盘片驱动装置。图8是示意本发明第六实施例盘片驱动装置中与转子80一体设置的具有中空环状部23e的球体平衡器22e的平面剖面图。另外，对于与上述第一实施例盘片驱动装置中的组成部分实际相同的组成部分，加上相同标号，并引用先前实施例的说明以省略重复的说明。Next, a disk drive device according to a sixth embodiment of the present invention will be described with reference to the drawings. 8 is a plan sectional view showing a ball balancer 22e having a hollow annular portion 23e integrally provided with a rotor 80 in a disk drive device according to a sixth embodiment of the present invention. In addition, the components that are actually the same as those in the disk drive apparatus of the above-mentioned first embodiment are given the same reference numerals, and the descriptions of the previous embodiments are referred to to omit repeated descriptions.

本发明第六实施例的盘片驱动装置，与上述第四、第五实施例相同，减小平衡器本身产生噪声的大小。如图8所示，可与主轴电动机2的转子80一体旋转形成球体平衡器22e。该球体平衡器22e由成为与主轴电动机2的主轴21同轴设置并具有环状通路的环状轨道部的中空环状部23e，和可移动地容纳于该中空环状部23e内部的多个球体24所构成。The disk drive device according to the sixth embodiment of the present invention is the same as the above-mentioned fourth and fifth embodiments, and reduces the amount of noise generated by the balancer itself. As shown in FIG. 8 , a ball balancer 22 e is formed that can rotate integrally with the rotor 80 of the spindle motor 2 . The ball balancer 22e is composed of a hollow ring part 23e which is an annular rail part provided coaxially with the main shaft 21 of the spindle motor 2 and has a ring passage, and a plurality of hollow ring parts movably housed inside the hollow ring part 23e. Sphere 24 constitutes.

本发明第六实施例的盘片驱动装置中，中空环状部23e外周内壁面25f的剖面形状为曲面形状(凹面形状)。上述以外构成与上述第一实施例相同。In the disk drive device according to the sixth embodiment of the present invention, the cross-sectional shape of the outer peripheral inner wall surface 25f of the hollow annular portion 23e is a curved shape (concave shape). The configuration other than the above is the same as that of the above-mentioned first embodiment.

如上所述构成的第六实施例盘片驱动装置中，在旋转质量失衡量A较大的盘片1时，与图2所示的上述第一实施例相同，中空环状部23e以振摆旋转中心轴P1为中心进行振摆旋转动作。In the disk drive device of the sixth embodiment configured as described above, when the disk 1 having a large mass imbalance A is rotated, the hollow annular portion 23e vibrates in the same manner as in the above-mentioned first embodiment shown in FIG. 2 . Vibrating rotation is performed around the rotation center axis P1.

此时，中空环状部23e中容纳的球体24存在振摆旋转中心轴P1和球体24重心之间连线方向上的离心力q作用。这里，中空环状部23e的外周内壁面25f，如图8所示，包含中空环状部23e中心轴P2的平面剖面为凹面形状，该凹面形状的曲率设定为小于球体24外表面的曲率。因而，球体24靠离心力q和外周内壁面25f的支持力保持在与中空环状部23e中心轴P2平行的对于外周内壁面25f的切线其切点位置。这时，中空环状部23e作用于球体24的支持力N，发生在与中空环状部23e中心轴P2垂直且指向中空环状部23e中心轴P2的方向上。因此，在以中空环状部23e中心P2为中心通过球体24重心的圆周切线方向上，并远离振摆旋转中心轴P1的方向上存在作为离心力q和支持力N的合力的移动力R作用于球体24上。球体24靠该移动力R沿外周内壁面25f的圆周方向移动，夹着振摆旋转的中心轴P1，向与盘片1的重心G1大致完全相对的位置集中。At this time, the spherical body 24 accommodated in the hollow annular portion 23e is subjected to a centrifugal force q in the direction of the line between the center axis of vibration P1 and the center of gravity of the spherical body 24 . Here, the outer peripheral inner wall surface 25f of the hollow annular portion 23e, as shown in FIG. . Therefore, the ball 24 is held at the tangent point of the tangent to the outer inner wall surface 25f parallel to the central axis P2 of the hollow annular portion 23e by the centrifugal force q and the supporting force of the outer inner wall surface 25f. At this time, the support force N acting on the spherical body 24 by the hollow annular portion 23e occurs in a direction perpendicular to the central axis P2 of the hollow annular portion 23e and directed toward the central axis P2 of the hollow annular portion 23e. Therefore, in the direction of the tangential line passing through the center of gravity of the spherical body 24 around the center P2 of the hollow annular portion 23e, and in the direction away from the vibrational rotation center axis P1, there is a moving force R that is the resultant force of the centrifugal force q and the supporting force N acting on it. Sphere 24. The ball 24 moves in the circumferential direction of the outer peripheral inner wall surface 25f by this moving force R, and gathers at a position substantially completely opposite to the center of gravity G1 of the disk 1 across the center axis P1 of the oscillating rotation.

因此，令作用于集中好的各个球体24的离心力q在失衡力相同方向上的分力为平衡力zk的话，可利用平衡力zk的合力Zn来抵消盘片1旋转所产生的失衡力F，作用于底盘座6的力便减小。因而，旋转失衡盘片1时产生的底盘座6的振动便受到确实抑制。Therefore, if the component force of the centrifugal force q acting on each concentrated ball 24 in the same direction as the unbalanced force is the balance force zk, the resultant force Zn of the balance force zk can be used to offset the unbalanced force F generated by the rotation of the disc 1, Acting on the power of chassis base 6 just reduces. Accordingly, the vibration of the chassis base 6 generated when the unbalanced disk 1 is rotated is reliably suppressed.

如上所述，第六实施例盘片驱动装置中，球体24在中空环状部23e中心轴P2方向上的位置，由作用于球体24的离心力q和外周内壁面25f的支持力保持在与中空环状部23e中心轴P2平行的对于外周内壁面25f的切线其切点位置。因而，即便从装置外部加上与中空环状部23c中心轴P2平行方向上的振动或冲击，球体24也不会在中空环状部23e内部与中空环状部23e中心轴P2平行方向上转动。所以，利用第六实施例的盘片驱动装置，可以避免球体24冲击中空环状部23e顶面或底面而产生噪声这种问题。As described above, in the disk drive device of the sixth embodiment, the position of the spherical body 24 in the direction of the central axis P2 of the hollow annular portion 23e is kept in line with the hollow ring by the centrifugal force q acting on the spherical body 24 and the support force of the outer peripheral inner wall surface 25f. The position of the tangent point of the tangent line to the outer peripheral inner wall surface 25f parallel to the central axis P2 of the annular portion 23e. Therefore, even if vibration or impact in a direction parallel to the central axis P2 of the hollow annular portion 23c is applied from the outside of the device, the ball 24 will not rotate in a direction parallel to the central axis P2 of the hollow annular portion 23e inside the hollow annular portion 23e. . Therefore, with the disk drive device of the sixth embodiment, it is possible to avoid the problem that the ball 24 hits the top surface or the bottom surface of the hollow annular portion 23e to generate noise.

而且，球体24由于仅与外周内壁面25f点接触，因而容易沿外周内壁面25f圆周方向移动，能够使球体24确实位于与盘片1的重心G1完全相对位置。Moreover, since the ball 24 is only in point contact with the outer peripheral inner wall surface 25f, it is easy to move along the circumferential direction of the outer peripheral inner wall surface 25f, so that the ball 24 can be positioned exactly opposite to the center of gravity G1 of the disk 1 .

综上所述，利用本发明第六实施例的构成，可以靠球体平衡器22e更为确实地抑制底盘座6的振动，而且可以防止球体平衡器22e本身产生的不适噪声。To sum up, with the configuration of the sixth embodiment of the present invention, the vibration of the chassis base 6 can be more reliably suppressed by the ball balancer 22e, and uncomfortable noise generated by the ball balancer 22e itself can be prevented.

另外，本发明的第一实施例至第六实施例，给出的是盘片1存在质量失衡量时的动作和效果，但在转台110、主轴电动机2的转子80等主轴电动机2旋转驱动的任一部件存在质量失衡时，利用本发明也可获得抑制该质量失衡造成振动的效果。In addition, the first to sixth embodiments of the present invention describe the actions and effects when there is a mass imbalance in the disk 1. When there is a mass imbalance in any part, the present invention can also obtain the effect of suppressing the vibration caused by the mass imbalance.

综上所述，本发明第一实施例至第六实施例的盘片驱动装置，可适用于一种为抑制盘片等质量失衡所产生振动的装置，在旋转盘片的状态下，在盘片上记录数据或重放盘片上记录的数据的所谓盘片驱动装置。主要效果在于，可以通过将本发明技术思想应用于CD、CD-ROM等只读光盘驱动装置、需要对高精度的光学读写头与盘片上记录轨之间相对距离进行控制(记录轨跟随控制)的可记录装置，来实现可靠性更高的装置。To sum up, the disk driving device of the first to sixth embodiments of the present invention can be applied to a device for suppressing the vibration caused by the mass imbalance of the disk, etc., in the state of rotating the disk, the A so-called disc drive that records data on a disc or reproduces data recorded on a disc. The main effect is that the relative distance between the high-precision optical read-write head and the recording track on the disc can be controlled by applying the technical idea of the present invention to read-only optical disc drive devices such as CD and CD-ROM (track following control) ) recordable device to achieve a more reliable device.

此外，本发明第一实施例至第六实施例，其效果还在于，不仅是用光学读写头进行非接触记录重放的装置，还对于利用接触式磁头或气垫式磁头对盘片进行记录重放的装置，对盘片质量失衡所造成的不希望的振动进行抑制。In addition, the effects of the first to sixth embodiments of the present invention are that they are not only devices for non-contact recording and replaying with optical read-write heads, but also for recording on disks with contact-type magnetic heads or air-cushion magnetic heads. The playback device suppresses unwanted vibrations caused by disc mass imbalance.

另外，本发明第一实施例至第六实施例的盘片驱动装置中，说明的是具有按环状轨道部密闭的环状空间的中空环状部，但本发明不限于这种构成，若具有球体可转动的环状轨道，例如用线材构成环状轨道等，便有本发明效果。In addition, in the disk drive devices of the first to sixth embodiments of the present invention, the hollow annular portion having the annular space sealed by the annular rail portion is described, but the present invention is not limited to this configuration. If There is a rotatable ring track with a sphere, such as forming a ring track with wire rods, etc., which have the effect of the present invention.

综上所述，利用本发明第一实施例至第六实施例的盘片驱动装置，通过可与盘片一体旋转设置容纳有平衡部件的平衡器，可以确实地抑制盘片质量失衡造成的底盘座振动，能够实现稳定的记录或重放。To sum up, by using the disk drive device of the first to sixth embodiments of the present invention, by installing a balancer that accommodates a balance member that can rotate integrally with the disk, the chassis damage caused by the imbalance of the disk mass can be reliably suppressed. base vibration, enabling stable recording or playback.

而且，利用本发明第一实施例至第六实施例的盘片驱动装置，可实现失衡盘片的高速旋转，可实现数据传送速度的提高。Furthermore, by using the disk drive apparatuses of the first to sixth embodiments of the present invention, high-speed rotation of the unbalanced disk can be realized, and an increase in the data transmission speed can be realized.

此外，利用本发明第一实施例至第六实施例的盘片驱动装置，可实现低噪声、并具有较强抗振动·抗冲击特性的盘片驱动装置。In addition, by using the disk drive device according to the first to sixth embodiments of the present invention, a disk drive device with low noise and strong anti-vibration and anti-shock characteristics can be realized.

利用本发明第一实施例至第六实施例的盘片驱动装置，可实现一种即便盘片旋转频率超过100Hz时也充分抑制盘片质量失衡所造成振动量的盘片驱动装置。With the disk drive device according to the first to sixth embodiments of the present invention, it is possible to realize a disk drive device that sufficiently suppresses the amount of vibration caused by disc mass imbalance even when the disk rotation frequency exceeds 100 Hz.

利用本发明第一实施例至第六实施例的盘片驱动装置，即便质量失衡量超过1gcm，也能够进行100Hz以上的高速旋转。According to the disk drive device according to the first to sixth embodiments of the present invention, high-speed rotation of 100 Hz or higher can be performed even if the mass imbalance exceeds 1 gcm.

利用本发明第一实施例至第六实施例的盘片驱动装置，不必将环状轨道部容纳的平衡部件即球体的个数增加到超过所需数目，便可以确实地抑制所装上的盘片因质量失衡所产生的振动。Utilizing the disc drive devices according to the first to sixth embodiments of the present invention, it is not necessary to increase the number of balance members, that is, spheres, accommodated in the annular rail portion beyond the required number, and it is possible to reliably restrain the mounted disc. The vibration of the film due to mass imbalance.

利用本发明第一实施例至第六实施例的盘片驱动装置，可以实现一种即便使所装上的失衡盘片高速旋转，也可充分抑制振动，能够高速传送的薄型盘片驱动装置。By using the disk drive device according to the first to sixth embodiments of the present invention, it is possible to realize a thin disk drive device capable of sufficiently suppressing vibration even if the mounted unbalanced disk is rotated at high speed, and capable of high-speed transmission.

利用本发明第一实施例至第六实施例的盘片驱动装置，可以实现一种即便是所装上的盘片质量失衡量非常大的时候，也具有较高振动抑制效果，并且可减小不适噪声的盘片驱动装置。Utilizing the disk drive device of the first to sixth embodiments of the present invention, it is possible to achieve a high vibration suppression effect even when the mass imbalance of the mounted disk is very large, and can reduce Discomfortably noisy disc drive.

利用本发明第一实施例至第六实施例的盘片驱动装置用平衡器，可实现一种即便质量失衡量超过1gcm，也能够进行高于100Hz的高速旋转的盘片驱动装置。With the disc drive balancers according to the first to sixth embodiments of the present invention, it is possible to realize a disc drive capable of high-speed rotation of more than 100 Hz even if the mass imbalance exceeds 1 gcm.

利用本发明第一实施例至第六实施例的盘片驱动装置用平衡器，不必将环状轨道部容纳的平衡部件即球体的个数增加到超过所需数目，便可以确实地抑制所装上的盘片因质量失衡所产生的振动。With the disc drive balancers according to the first to sixth embodiments of the present invention, it is not necessary to increase the number of balls, that is, the balance members accommodated in the annular rail portion, more than necessary, and it is possible to reliably suppress the number of mounted balls. The vibration of the disc on the disc due to mass imbalance.

本发明第一实施例至第六实施例的盘片驱动装置用平衡器，可以抑制平衡器本身产生的噪声。The balancers for disc drive devices according to the first to sixth embodiments of the present invention can suppress the noise generated by the balancer itself.

《第七实施例至第十三实施例所解决的问题》"Problems Solved by the Seventh Embodiment to the Thirteenth Embodiment"

近年来，进行数据记录重放的盘片驱动装置，为了提高数据传送速度，正进一步使盘片高速旋转。但盘片存在因其厚度不均匀或偏心等造成的质量失衡。存在这样的问题，若高速旋转具有这种质量失衡的盘片的话，便有相对于盘片旋转中心偏离的离心力(失衡力)的作用，该失衡力所产生的振动会传递给装置整体。该失衡力大小与旋转频率的平方成正比增加，因而振动随盘片转速的提高而急剧加大。所以有如下问题，高速旋转盘片便振动，由于此振动而产生噪声，或使盘片旋转驱动用主轴电动机轴承损伤，并且盘片振动使进行记录重放的读写头振动，不能进行稳定的记录重放。此外，将盘片驱动装置内置于计算机等当中时，还有盘片的振动传递给其他周边设备带来不良影响这种问题。In recent years, in a disk drive device for recording and reproducing data, the disk is further rotated at a higher speed in order to increase the data transfer speed. However, the disc has a quality imbalance caused by its uneven thickness or eccentricity. There is a problem that if the disc having such mass imbalance is rotated at high speed, a centrifugal force (unbalance force) deviated from the rotation center of the disc acts, and the vibration generated by the imbalance force is transmitted to the whole device. The magnitude of the unbalanced force increases in proportion to the square of the rotation frequency, so the vibration increases sharply with the increase of the rotation speed of the disc. Therefore, there are problems as follows: the high-speed rotation of the disc vibrates, noise is generated due to this vibration, or the bearing of the spindle motor for driving the disc rotation is damaged, and the vibration of the disc vibrates the read/write head for recording and playback, making it impossible to perform stable recording. Record playback. In addition, when the disk drive device is built into a computer or the like, there is a problem that the vibration of the disk is transmitted to other peripheral devices and adversely affects other peripheral devices.

为了解决这类问题，现有的盘片驱动装置中，一般加上了在机架振动较大时判断不能进行记录重放，自动降低盘片转速的功能。具有这种功能的现有盘片驱动装置，构成为在高速旋转质量失衡量大的盘片场合检测出发生较大振动时，自动将盘片转速降低直到其振动相对较小为止，进行可靠的记录重放。In order to solve this type of problem, in the existing disk drive device, the function of automatically reducing the rotation speed of the disk is generally added to judge that the recording and playback cannot be performed when the frame vibration is relatively large. The existing disk drive device with this function is configured to automatically reduce the rotation speed of the disk until the vibration is relatively small when a large vibration is detected in the case of a disk with a high-speed rotating mass imbalance, so as to perform reliable operation. Record playback.

但不论盘片质量失衡量大小如何，对于盘片高速记录重放的市场需求总是较高，对盘片质量失衡所造成的不希望的振动进行抑制，成为该领域应完成的课题。另外，令盘片质量为M(g)，盘片中心距盘片重心的距离为L(cm)，失衡量A(gcm)则用A＝M×L表示。However, regardless of the disc quality imbalance, the market demand for high-speed recording and replay of the disc is always high, and suppressing the undesired vibration caused by the disc mass imbalance has become a subject to be completed in this field. In addition, let the mass of the disk be M(g), the distance between the center of the disk and the center of gravity of the disk be L(cm), and the imbalance A(gcm) is represented by A=M×L.

对上述课题，日本专利特开平10—83622号公报，也提出了称为平衡器，解除质量失衡的机构的方案。For the above-mentioned problems, Japanese Patent Application Laid-Open Publication No. 10-83622 also proposes a scheme called a balancer that removes mass imbalance.

接下来参照附图说明一例加装现有平衡器的盘片驱动装置。Next, an example of a disk drive device equipped with a conventional balancer will be described with reference to the accompanying drawings.

图9是示意现有盘片驱动装置的斜视图。图9中，盘片301由主轴电动机302旋转驱动。读写头303对盘片301上所记录的数据进行重放(读取)，或对盘片301进行数据记录(写入)。Fig. 9 is a perspective view schematically showing a conventional disk drive unit. In FIG. 9 , a disk 301 is rotationally driven by a spindle motor 302 . The head 303 reproduces (reads) data recorded on the disk 301 or records (writes) data on the disk 301 .

由传动齿条326和传动齿轮327构成的横向进给机构305，是用来将读写头303从盘片301内周移动至外周，或从外周移动至内周的机构。上述横向进给机构305构成为通过横向电动机304旋转驱动传动齿轮327来驱动。传动齿轮327的旋转驱动，靠传动齿条326变换为直线运动，传递给读写头303。底盘座306上装配有主轴电动机302、横向电动机304以及横向进给机构305等。底盘座306通过隔振子307(弹性体)装配在主底座308上。从装置外部传递给底盘座306的振动或冲击由隔振子307衰减。盘片驱动装置主体构成为通过主底座308上装配的框架(未图示)组装到计算机装置等当中。The transverse feed mechanism 305 composed of the transmission rack 326 and the transmission gear 327 is used to move the read/write head 303 from the inner periphery to the outer periphery of the disk 301 or from the outer periphery to the inner periphery. The traverse feed mechanism 305 described above is configured to be driven by the traverse motor 304 rotating the transmission gear 327 . The rotational drive of the transmission gear 327 is converted into a linear motion by the transmission rack 326 and transmitted to the read/write head 303 . The chassis base 306 is equipped with a spindle motor 302 , a traverse motor 304 , a traverse feed mechanism 305 and the like. The chassis seat 306 is assembled on the main base 308 through the vibration isolator 307 (elastic body). Vibration or impact transmitted to the chassis base 306 from the outside of the device is attenuated by the vibration isolator 307 . The main body of the disk drive device is configured to be incorporated into a computer device or the like via a frame (not shown) attached to the main chassis 308 .

图10是示意现有盘片驱动装置中主轴电动机302周围的侧视剖面图。转台301固定在主轴电动机302的主轴321上，可旋转地支持盘片301的夹紧区域311。转台310上一体形成有与盘片301的夹紧孔312嵌合的轴套314。通过盘片301与轴套314嵌合，对盘片301进行定位。轴套314上表面稍稍中央部位形成有定位孔313。而且，轴套314上表面埋设有对置磁轭315。FIG. 10 is a side sectional view showing the surroundings of the spindle motor 302 in the conventional disk drive device. The turntable 301 is fixed to the spindle 321 of the spindle motor 302 and rotatably supports the clamping area 311 of the disk 301 . The turntable 310 is integrally formed with a sleeve 314 fitted with the clamping hole 312 of the disc 301 . The disk 301 is positioned by fitting the disk 301 with the sleeve 314 . A positioning hole 313 is formed slightly in the center of the upper surface of the shaft sleeve 314 . Moreover, the opposite magnetic yoke 315 is buried on the upper surface of the shaft sleeve 314 .

夹紧机构350上形成有中心突起317，用来与转台310上设置的定位孔313嵌合并定位。而且，夹紧机构350的中心突起317的周围固定有环状磁体318。磁体318的外周设有中空环状部320，该中空环状部320当中配置了6个具有磁性的滚珠324。A central protrusion 317 is formed on the clamping mechanism 350 for fitting and positioning with the positioning hole 313 provided on the turntable 310 . Also, a ring magnet 318 is fixed around the center protrusion 317 of the clamping mechanism 350 . A hollow ring portion 320 is disposed on the outer periphery of the magnet 318 , and six magnetic balls 324 are arranged in the hollow ring portion 320 .

盘片301停转时，利用磁体318的磁力吸引滚珠324。可根据所放置的盘片301其质量失衡量大小来调整滚珠324的直径和个数。夹紧机构350的下表面形成有与盘片301接触的平整接触部319。When the disk 301 stops rotating, the magnetic force of the magnet 318 attracts the ball 324 . The diameter and number of the balls 324 can be adjusted according to the mass imbalance of the placed disc 301 . The lower surface of the clamping mechanism 350 is formed with a flat contact portion 319 that contacts the disk 301 .

如上所述构成的现有盘片驱动装置中，盘片301被夹紧状态下，通过夹紧孔312和轴套314嵌合，将盘片301置放在转台310上。而且，这时盘片301由夹紧机构350中内置的磁体318和转台310上固定的对置磁轭315之间的作用力所保持。这样保持的盘片301靠主轴电动机302与转台310和夹紧机构350一体旋转驱动。In the conventional disk drive device configured as above, when the disk 301 is clamped, the disk 301 is placed on the turntable 310 by fitting the clamp hole 312 and the sleeve 314 . Also, at this time, the disk 301 is held by the force between the magnet 318 built in the clamp mechanism 350 and the opposing yoke 315 fixed on the turntable 310 . The disc 301 held in this way is driven to rotate integrally with the turntable 310 and the clamp mechanism 350 by the spindle motor 302 .

此时，盘片301存在质量失衡的话，图10所示的盘片301的重心G1便有离心力(失衡力)F作用。该作用方向随盘片301的旋转而旋转。该失衡力F产生的振动通过转台310和主轴电动机302传递给底盘座306。通过为弹性体的隔振子307由主底座308支持底盘座306，因而底盘座306随隔振子307的形变因该失衡力F的作用有较大振摆旋转。失衡力F的大小与盘片301的质量失衡量(用gcm表示)和旋转频率的平方之间的乘积成正比。因此，底盘座306的振动加速度也与盘片301的旋转频率平方大致成正比急剧增大。At this time, if the mass of the disc 301 is out of balance, the center of gravity G1 of the disc 301 shown in FIG. 10 acts on the centrifugal force (unbalanced force) F. The action direction rotates with the rotation of the disk 301 . The vibration generated by the unbalanced force F is transmitted to the chassis base 306 through the turntable 310 and the spindle motor 302 . The chassis base 306 is supported by the main base 308 through the vibration isolator 307 which is an elastic body, so the chassis base 306 vibrates and rotates with the deformation of the vibration isolator 307 due to the unbalanced force F. The magnitude of the imbalance force F is proportional to the product of the mass imbalance (expressed in gcm) of the disk 301 and the square of the rotation frequency. Therefore, the vibration acceleration of the chassis base 306 also sharply increases roughly proportional to the square of the rotation frequency of the disk 301 .

图11是现有盘片驱动装置中用中空环状部等构成的平衡器322其动作的说明图。在如上所述将质量失衡的盘片301装到盘片驱动装置上的状态，夹紧机构350上设置的平衡器322中的中空环状部320与主轴电动机302的旋转中心轴P0同轴定位。因此，中空环状部320的中心即中空环状部320内侧外周壁面325的中心P2，与主轴电动机302的旋转中心轴P0位置相一致。FIG. 11 is an explanatory diagram showing the operation of a balancer 322 formed of a hollow annular portion or the like in a conventional disk drive device. In the state where the mass-unbalanced disc 301 is mounted on the disc drive device as described above, the hollow annular portion 320 in the balancer 322 provided on the clamp mechanism 350 is positioned coaxially with the rotation center axis P0 of the spindle motor 302 . Therefore, the center of the hollow annular portion 320 , that is, the center P2 of the inner peripheral wall surface 325 of the hollow annular portion 320 coincides with the rotation center axis P0 of the spindle motor 302 .

通过离心力(失衡力)F作用于盘片301的重心G1，中空环状部320进行振摆旋转(转圈)动作，盘片301的质量失衡量越大，该振摆旋转的中心轴P1距主轴电动机302旋转中心轴P0的偏移量越大。因此，盘片301的质量失衡量越大，隔振子307所支持的底盘座306的振动其振幅越大。When the centrifugal force (unbalanced force) F acts on the center of gravity G1 of the disc 301, the hollow annular part 320 performs a vibratory rotation (circling) movement. The greater the mass imbalance of the disc 301, the greater the distance between the central axis P1 of the vibratory rotation and the main shaft. The larger the amount of deviation of the rotation center axis P0 of the motor 302 is. Therefore, the greater the mass imbalance of the disk 301 is, the greater the vibration amplitude of the chassis base 306 supported by the vibrator 307 is.

此时，中空环状部320所容纳的滚珠324有振摆旋转中心轴P1和滚珠324重心连线方向上的离心力q作用。而且，滚珠324由中空环状部320的外周壁面325约束其移动，因而滚珠324有内侧外周壁面325的支持力N作用。来自该内侧外周壁面325的支持力N作用于朝向内侧外周壁面325中心P2的方向。At this time, the balls 324 accommodated in the hollow ring portion 320 are subjected to the centrifugal force q in the direction of the line connecting the center axis of vibration P1 and the center of gravity of the balls 324 . Furthermore, the movement of the ball 324 is constrained by the outer peripheral wall surface 325 of the hollow annular portion 320 , so that the ball 324 has the supporting force N of the inner outer peripheral wall surface 325 acting on it. The support force N from the inner outer peripheral wall surface 325 acts in a direction toward the center P2 of the inner outer peripheral wall surface 325 .

因而，在以内侧外周壁面325的中心P2为中心通过滚珠324重心的圆周切线方向上，并远离振摆旋转中心轴P1的方向上，存在作为离心力q和支持力N的合力的移动力R作用于滚珠324上。滚珠324靠该移动力R沿内侧外周壁面325移动，夹着振摆旋转的中心轴P1，向相对于盘片301的重心G1大致旋转180度的位置集中。Therefore, in the direction of the circumferential tangent line passing through the center of gravity of the ball 324 with the center P2 of the inner peripheral wall surface 325 as the center, and in the direction away from the vibrational rotation center axis P1, there is a moving force R acting as a resultant force of the centrifugal force q and the supporting force N. On the ball 324. The balls 324 move along the inner peripheral wall surface 325 by this moving force R, and gather at a position rotated approximately 180 degrees with respect to the center of gravity G1 of the disk 301 across the center axis P1 of the oscillating rotation.

因此，作用于集中好的6个滚珠324整体的离心力Q，作用于与盘片301的重心G1上作用的失衡力F的相反方向。可由该离心力Q抵消失衡力F。由此，通过盘片301、主轴电动机302作用于底盘座306的力减小。因此，振摆旋转中心轴P1至主轴电动机302的旋转中心轴P0的偏移量减小，隔振子307所支持的底盘座306的振动其振幅减小。因而，可抑制质量失衡量大的盘片301旋转时所产生的底盘座306的振动。Therefore, the centrifugal force Q acting on the entirety of the six balls 324 that have been concentrated acts in a direction opposite to the unbalanced force F acting on the center of gravity G1 of the disk 301 . The out-of-balance force F can be offset by this centrifugal force Q. Thus, the force acting on the chassis base 306 through the disk 301 and the spindle motor 302 is reduced. Therefore, the amount of offset from the vibration center axis P1 to the rotation center axis P0 of the spindle motor 302 is reduced, and the vibration amplitude of the chassis base 306 supported by the vibrator 307 is reduced. Therefore, vibration of the chassis base 306 generated when the disk 301 with a large mass imbalance is rotated can be suppressed.

如上所述的现有盘片驱动装置构成中，高速旋转具有质量失衡量的盘片时振动抑制效果好。但在高速旋转质量失衡小的盘片时，有时因下面原因，存在振动比未组装平衡机构的现有盘片驱动装置大的场合。In the configuration of the conventional disk drive device as described above, the vibration suppression effect is good when a disk having a mass imbalance is rotated at a high speed. However, when a disk with a small mass imbalance is rotated at high speed, the vibration may be larger than that of a conventional disk drive device without a balance mechanism due to the following reasons.

组装了现有平衡器机构的盘片驱动装置构成中，高速旋转具有质量失衡的盘片301的话，如图11所示，盘片301的重心G1便有离心力(失衡力)F作用，夹紧机构350设置的中空环状部320中容纳的磁性滚珠324便向盘片301的重心G1和振摆旋转中心P1的相反方向集中。因此，上述失衡力F由滚珠324的离心力Q抵消，因而解除了现有装置中底盘座306振动这种问题。In the configuration of the disk drive device assembled with the conventional balancer mechanism, if the disk 301 with mass imbalance is rotated at high speed, as shown in FIG. The magnetic balls 324 accommodated in the hollow ring portion 320 provided by the mechanism 350 concentrate toward the opposite direction of the center of gravity G1 of the disc 301 and the center of vibration P1 of rotation. Therefore, the above-mentioned unbalanced force F is offset by the centrifugal force Q of the ball 324, thereby eliminating the problem of vibration of the chassis base 306 in the prior art.

但作用于滚珠324的力，除了离心力q、为来自中空环状部320内侧外周壁面325反作用力的支持力N、以及为离心力q和支持力N的合力的移动力R，还存在与支持力N和内侧外周壁面325的摩擦系数成正比且较大、作用于与移动力相反方向的摩擦力M。该摩擦力M作用于滚珠324，移动力R超过摩擦力M时，滚珠324便开始移动。因而，仅当盘片301的质量失衡超过规定值时，滚珠324才在消除质量失衡的方向上移动。However, the force acting on the ball 324 includes the centrifugal force q, the support force N that is the reaction force from the inner peripheral wall surface 325 of the hollow annular portion 320, and the moving force R that is the resultant force of the centrifugal force q and the support force N, and the support force. N is proportional to the coefficient of friction of the inner peripheral wall surface 325 and is larger than the frictional force M that acts in the direction opposite to the moving force. The friction force M acts on the ball 324, and when the moving force R exceeds the friction force M, the ball 324 starts to move. Therefore, only when the mass imbalance of the disk 301 exceeds a predetermined value, the balls 324 move in the direction to eliminate the mass imbalance.

反之，高速旋转质量失衡低于规定值的盘片301或完全没有质量失衡的盘片301时，盘片301和底盘座306的振摆旋转中心P1的偏移量和振动的振幅也相对较小。这种场合，滚珠324的移动力R比摩擦力M小，因而滚珠324不能移动至消除质量失衡的位置。盘片301的旋转速度增加，因离心力q脱离磁体318后，滚珠324的位置便无法预测。Conversely, when the disc 301 whose mass imbalance is lower than the specified value is rotated at high speed or the disc 301 has no mass imbalance at all, the offset and vibration amplitude of the vibration center P1 of the disc 301 and the chassis base 306 are also relatively small. . In this case, since the moving force R of the ball 324 is smaller than the frictional force M, the ball 324 cannot move to a position where mass imbalance is eliminated. As the rotation speed of the disk 301 increases, the position of the ball 324 becomes unpredictable after being separated from the magnet 318 due to the centrifugal force q.

结果，高速旋转完全没有质量失衡的盘片301时，有时滚珠324集中于中空环状部320某一位置，相对于原来盘片301所具有的质量失衡使整体失衡增加。As a result, when the disc 301 with no mass imbalance is rotated at high speed, the balls 324 may be concentrated at a certain position of the hollow ring portion 320 , which increases the overall imbalance relative to the mass imbalance of the original disc 301 .

这样，就存在本来防止盘片301质量失衡造成盘片驱动装置振动为目的所设置的机构起到如上所述相反作用这种问题。Thus, there is a problem that the mechanism originally provided for the purpose of preventing the disk drive device from vibrating due to mass imbalance of the disk 301 has the opposite effect as described above.

一般市场上流通的盘片301，质量失衡少的盘片301占绝大多数，因而组装现有平衡器的盘片驱动装置如上所述反而发生振动大这种问题的频率非常高，该情形正是组装现有平衡器的盘片驱动装置所应解决的重大问题。Generally, among the disks 301 that are distributed in the market, the disks 301 with less mass imbalance account for the vast majority. Therefore, the frequency of the disk drive unit incorporating the conventional balancer is very high. It is a major problem to be solved in assembling the disk driving device of the existing balancer.

本发明的第七实施例或后面述及的第八实施例至第十三实施例，解决上述问题，提供一种不论盘片质量失衡大小如何，即便高速旋转也能进行稳定的记录或重放，具有较高数据传送速度的盘片驱动装置。The seventh embodiment of the present invention or the eighth embodiment to the thirteenth embodiment described later solves the above-mentioned problems, and provides a stable recording or playback even if the disc is rotated at a high speed regardless of the magnitude of the mass imbalance of the disc. , a disc drive with a higher data transfer speed.

《第七实施例》"Seventh Embodiment"

以下参照附图说明本发明第七实施例的盘片驱动装置。A disk drive device according to a seventh embodiment of the present invention will be described below with reference to the drawings.

图12是示意本发明第七实施例盘片驱动装置中主轴电动机302周围的侧视剖面图。图13是说明本发明第七实施例盘片驱动装置中对夹紧机构所设置的平衡器滚珠的作用力的平面剖面图。FIG. 12 is a side sectional view showing the surroundings of the spindle motor 302 in the disk drive apparatus according to the seventh embodiment of the present invention. 13 is a plan sectional view illustrating the force applied to the balancer ball provided in the clamping mechanism in the disk drive device according to the seventh embodiment of the present invention.

图12中，第七实施例的盘片驱动装置，构成为由夹紧机构316夹住转台310上的盘片301，由主轴电动机302旋转驱动盘片301。该盘片驱动装置中，利用读写头303读出盘片301上记录的数据，或对盘片301进行数据写入。底盘座306上装配有主轴电动机302、横向电动机和横向进给机构等。底盘座306通过隔振子307装配在主底座308上。从装置外部传递给底盘座306的振动或冲击可由隔振子307衰减。盘片驱动装置构成为通过主底座308上装配的框架组装到计算机装置等当中。In FIG. 12 , the disc drive device of the seventh embodiment is configured such that a disc 301 on a turntable 310 is clamped by a clamping mechanism 316 , and the disc 301 is rotationally driven by a spindle motor 302 . In this disk drive device, the data recorded on the disk 301 is read or written into the disk 301 by the head 303 . The chassis base 306 is equipped with a spindle motor 302, a transverse motor, a transverse feed mechanism, and the like. The chassis seat 306 is assembled on the main base 308 through the vibration isolator 307 . Vibration or impact transmitted to the chassis base 306 from the outside of the device can be attenuated by the vibration isolator 307 . The disk drive device is configured to be incorporated into a computer device or the like through a frame mounted on the main chassis 308 .

转台310固定在主轴电动机302的旋转轴21上，可旋转地支持盘片301的夹紧区域311。转台310上一体形成有与盘片301的夹紧孔312嵌合的轴套314。盘片301通过与轴套314嵌合，对盘片对准中心。而且轴套314的上部埋设有对置磁轭315。The turntable 310 is fixed to the rotating shaft 21 of the spindle motor 302 and rotatably supports the clamping area 311 of the disk 301 . The turntable 310 is integrally formed with a sleeve 314 fitted with the clamping hole 312 of the disc 301 . The disk 301 is aligned with the center of the disk by fitting with the sleeve 314 . Moreover, an opposing yoke 315 is embedded in the upper portion of the sleeve 314 .

夹紧机构316上设有用于与转台310上形成的定位孔313嵌合、对盘片301进行对准的中心突起317。夹紧机构316的中心突起317的周边固定有环状磁体318。The clamping mechanism 316 is provided with a central protrusion 317 for fitting with the positioning hole 313 formed on the turntable 310 to align the disc 301 . A ring magnet 318 is fixed around the periphery of the central protrusion 317 of the clamping mechanism 316 .

本发明第七实施例的盘片驱动装置中，夹紧机构316上设有平衡器221。如图12所示，第七实施例夹紧机构316上，与相对于转台310定位所用的中心突起(中心轴)317同轴设有中空环状部320。In the disc drive device according to the seventh embodiment of the present invention, the clamping mechanism 316 is provided with a balancer 221 . As shown in FIG. 12 , on the clamping mechanism 316 of the seventh embodiment, a hollow annular portion 320 is coaxially provided with a central protrusion (central axis) 317 for positioning relative to the turntable 310 .

图13示出的是第七实施例盘片驱动装置中夹紧机构316中设有的平衡器221的内部构成，是说明成为环状轨道的中空环状部320所封入的多个滚珠324a、324b、324c、324d受到的作用力的平面剖面图。如图13所示，中空环状部320的内部形成有由多个间隔330a、330b、330c、330d在圆周方向上分割的多个圆弧状平衡室323a、323b、323c、323d。这些圆弧状平衡室323a、323b、323c、323d中每一个分别可移动地容纳有1个滚珠324a、324b、324c、324d。如上所述，平衡器221由多个圆弧状平衡室323a、323b、323c、323d中分别容纳的滚珠324a、324b、324c、324d，该平衡器221与夹紧机构316一体形成。夹紧机构316的底面形成有与盘片301接触的平整接触部319。FIG. 13 shows the internal structure of the balancer 221 provided in the clamping mechanism 316 of the disk drive device of the seventh embodiment. Plane cross-sectional views of forces experienced by 324b, 324c, 324d. As shown in FIG. 13 , a plurality of arc-shaped balance chambers 323a, 323b, 323c, and 323d divided in the circumferential direction by a plurality of intervals 330a, 330b, 330c, and 330d are formed inside the hollow annular portion 320 . Each of these arc-shaped balance chambers 323a, 323b, 323c, 323d movably accommodates one ball 324a, 324b, 324c, 324d, respectively. As mentioned above, the balancer 221 is composed of balls 324 a , 324 b , 324 c , 324 d respectively housed in a plurality of arc-shaped balance chambers 323 a , 323 b , 323 c , 323 d , and the balancer 221 is integrally formed with the clamping mechanism 316 . The bottom surface of the clamping mechanism 316 is formed with a flat contact portion 319 that contacts the disk 301 .

如图12所示，转台310上形成有贯通转台310的定位孔313，该定位孔313与作为主轴电动机302旋转中心轴P0的主轴321嵌合。由此，转台310固定在主轴321上，构成为与主轴电动机302一体旋转。As shown in FIG. 12 , a positioning hole 313 penetrating through the turntable 310 is formed on the turntable 310 , and the positioning hole 313 is fitted with a spindle 321 serving as a rotation center axis P0 of the spindle motor 302 . Thus, the turntable 310 is fixed to the spindle 321 and is configured to rotate integrally with the spindle motor 302 .

在由上述夹紧机构316夹紧盘片301的状态下，与上述图32所示现有盘片驱动装置相同，盘片301将夹紧孔312和轴套314嵌合，置放在转台310上。而且，盘片301靠夹紧机构316上设置的磁体318和转台310上固定的对置磁轭315之间作用的磁力夹着并夹紧。这时，夹紧机构316设置的中心突起(中心轴)317与转台310上设置的定位孔313嵌合来定位。因而，与中心突起(中心轴)317同轴设置的中空环状部320，与主轴电动机302的旋转中心轴P0(图2)同轴。由此，夹紧机构316通过主轴电动机的驱动，与盘片301和转台310一体旋转驱动。In the state where the disc 301 is clamped by the above-mentioned clamping mechanism 316, the same as the conventional disc driving device shown in FIG. superior. Furthermore, the disk 301 is clamped and clamped by the magnetic force acting between the magnet 318 provided on the clamping mechanism 316 and the opposing magnetic yoke 315 fixed on the turntable 310 . At this time, the center protrusion (central shaft) 317 provided on the clamp mechanism 316 is fitted into the positioning hole 313 provided on the turntable 310 to be positioned. Therefore, the hollow annular portion 320 provided coaxially with the central protrusion (central axis) 317 is coaxial with the rotational central axis P0 ( FIG. 2 ) of the spindle motor 302 . Thus, the chuck mechanism 316 is driven to rotate integrally with the disk 301 and the turntable 310 by the drive of the spindle motor.

而且，本发明第七实施例的盘片驱动装置中，为了将底盘座306与主底座308联结，可采用对聚氨酯橡胶等弹性体整形得到的隔振子307。因此，将隔振子307形变造成的底盘座306的机械振动与盘片301记录面相平行方向的一次谐振频率设定得比盘片301旋转频率低。具体来说，将盘片301的旋转频率设定为大约100Hz时，再将读写头由横向进给驱动机构所驱动方向(横向进给方向)上的底盘座306的振动和与之相正交方向上(晃动方向)的底盘座306的振动其一次谐振频率均设定为大约60Hz。Furthermore, in the disk drive device of the seventh embodiment of the present invention, in order to connect the chassis base 306 and the main base 308, the vibration isolator 307 obtained by shaping an elastic body such as polyurethane rubber can be used. Therefore, the primary resonance frequency of the mechanical vibration of the chassis base 306 caused by the deformation of the vibration isolator 307 parallel to the recording surface of the disk 301 is set lower than the rotation frequency of the disk 301 . Specifically, when the rotational frequency of the disc 301 is set to approximately 100 Hz, the vibration of the chassis base 306 in the direction (cross-feed direction) driven by the read-write head by the traverse-feed drive mechanism and its phase The primary resonant frequency of the vibration of the chassis base 306 in the orthogonal direction (shaking direction) is set to about 60 Hz.

利用图12和图13说明如上所述构成的本发明第七实施例的盘片驱动装置按100Hz旋转质量失衡大的盘片301时的动作。The operation of the disk drive apparatus according to the seventh embodiment of the present invention constructed as described above when a disk 301 with a large mass imbalance is rotated at 100 Hz will be described with reference to FIGS. 12 and 13. FIG.

首先，图13(a)示出了按100Hz旋转盘片301时的初始状态。如图13(a)所示，盘片301的重心G有离心力(称为失衡力F)作用，其作用方向随盘片301的旋转而旋转。隔振子307(图12)因该失衡力F而形变，底盘座306和底盘座306上搭载的构成部件整体按盘片301的旋转频率进行振摆旋转的振动。这里，隔振子307形变造成的底盘座306的谐振频率(约60Hz)可设定得比盘片301旋转频率(约100Hz)低。由此，底盘座306的位移方向和失衡力F的作用方向总是为大致相反方向。因而，底盘座306上旋转的盘片301的振摆旋转中心轴P1偏移到失衡力F所作用的盘片301的重心G和主轴电动机302旋转中心轴P0之间。First, FIG. 13(a) shows the initial state when the disk 301 is rotated at 100 Hz. As shown in FIG. 13( a ), the center of gravity G of the disk 301 has a centrifugal force (called an unbalanced force F), and its acting direction rotates with the rotation of the disk 301 . The vibration isolator 307 ( FIG. 12 ) is deformed by the unbalanced force F, and the chassis base 306 and the components mounted on the chassis base 306 as a whole vibrate in a vibrating rotation at the rotation frequency of the disk 301 . Here, the resonant frequency (about 60 Hz) of the chassis base 306 caused by the deformation of the vibrator 307 can be set lower than the rotation frequency (about 100 Hz) of the disk 301 . Thus, the displacement direction of the chassis base 306 and the acting direction of the unbalanced force F are always substantially opposite directions. Accordingly, the center axis P1 of the wobbling rotation of the disk 301 rotating on the chassis base 306 is shifted between the center of gravity G of the disk 301 on which the unbalanced force F acts and the center axis of rotation P0 of the spindle motor 302 .

如上所述状态下，夹紧机构316设有的中空环状部320与主轴电动机302的旋转中心轴P0同轴定位，因而中空环状部320的中心即各圆弧状平衡室323a、323b、323c、323d的内侧外周壁面325a、325b、325c、325d的圆弧中心P2和主轴电动机302的旋转中心轴P0的位置一致。由此，中空环状部320以振摆旋转中心轴P1为中心进行振摆旋转动作。In the state as described above, the hollow annular portion 320 provided on the clamping mechanism 316 is positioned coaxially with the rotation center axis P0 of the spindle motor 302, so that the centers of the hollow annular portion 320 are the arc-shaped balance chambers 323a, 323b, The arc center P2 of the inner peripheral wall surface 325a, 325b, 325c, 325d of 323c, 323d coincides with the position of the rotation center axis P0 of the spindle motor 302 . As a result, the hollow annular portion 320 vibrates around the vibrating central axis P1.

此时，中空环状部320容纳的滚珠324a存在振摆旋转中心轴P1和滚珠324a本身重心连线方向上离心力q1的作用。而滚珠324a靠中空环状部320内侧外周壁面325a约束其移动，因而滚珠324a存在来自内侧外周壁面325a的支持力N1的作用。该内侧外周壁面325a的支持力N1作用于指向内侧外周壁面325a中心P2的方向上。由此，在以内侧外周壁面325a的中心P2为中心通过滚珠324a重心的圆周切线方向上，并远离振摆旋转中心轴P1的方向上，存在作为离心力q1和支持力N1的合力的移动力R1作用于滚珠324a上。滚珠324a由该移动力R1沿内侧外周壁面325a移动，移动到间隔330a限制移动位置处停止。At this time, the ball 324a accommodated in the hollow ring portion 320 has the effect of the centrifugal force q1 on the line connecting the center axis of vibration P1 and the center of gravity of the ball 324a itself. The movement of the ball 324a is restrained by the inner peripheral wall surface 325a of the hollow annular portion 320, so the ball 324a has the function of supporting force N1 from the inner peripheral wall surface 325a. The supporting force N1 of the inner peripheral wall surface 325a acts in a direction directed toward the center P2 of the inner peripheral wall surface 325a. Thus, in the direction of the circumferential tangent line passing through the center of gravity of the ball 324a around the center P2 of the inner peripheral wall surface 325a, and in the direction away from the vibrational rotation center axis P1, there is a moving force R1 that is the resultant force of the centrifugal force q1 and the support force N1. Acts on the ball 324a. The ball 324a moves along the inner outer peripheral wall surface 325a by this moving force R1, and stops at the position where the gap 330a restricts movement.

此时，与上述滚珠324a相同，其他滚珠324b、324c、324d也移动到各自间隔330b、330c、330d限制移动位置处停止。At this time, similarly to the ball 324a, the other balls 324b, 324c, and 324d also move to stop at the movement-limiting positions of the respective intervals 330b, 330c, and 330d.

因此，如图13(b)所示，作用于各个滚珠324a、324b、324c、324d的离心力q1、q2、q3、q4的合成矢量即离心力Q作用于与盘片301重心G上作用的失衡力F大致为相反方向。因此，可由离心力Q抵消失衡力F，作用于底盘座306上的力大幅减小。因而，具有质量失衡的盘片301旋转时所产生的底盘座306的振动受到抑制。Therefore, as shown in FIG. 13(b), the resultant vector of the centrifugal forces q1, q2, q3, and q4 acting on the respective balls 324a, 324b, 324c, and 324d, that is, the centrifugal force Q acts on the unbalanced force acting on the center of gravity G of the disc 301. F is roughly the opposite direction. Therefore, the centrifugal force Q can offset the balancing force F, and the force acting on the chassis base 306 is greatly reduced. Thus, the vibration of the chassis base 306 generated when the disk 301 having mass imbalance is rotated is suppressed.

接下来参照图14说明第七实施例盘片驱动装置中旋转质量失衡盘片301时各个滚珠324a、324b、324c、324d的移动。Next, the movements of the respective balls 324a, 324b, 324c, 324d in the disk drive device of the seventh embodiment when the mass-unbalanced disk 301 is rotated will be described with reference to FIG. 14 .

图14示出的是盘片驱动装置上装上质量失衡盘片301并加速旋转时夹紧机构316内滚珠324a、324b、324c、324d位置随时间的变化。图14所示状态，处于质量失衡盘片301的重心G位置位于间隔330a延长线(半径方向)上的状态，该状态示出的是将盘片301夹紧的状态。图14中，随着盘片301转速增加，平衡器状态按空心箭头方向变化。FIG. 14 shows the time-dependent changes in the positions of the balls 324a, 324b, 324c, and 324d in the clamping mechanism 316 when the mass-unbalanced disk 301 is mounted on the disk drive device and rotated at an accelerated rate. In the state shown in FIG. 14, the position of the center of gravity G of the mass-unbalanced disk 301 is located on the extension line (radius direction) of the space 330a, and this state shows the state in which the disk 301 is clamped. In FIG. 14 , as the rotation speed of the disk 301 increases, the state of the balancer changes in the direction of the hollow arrow.

图14(a)示出盘片301停转时的状态，各滚珠324a、324b、324c、324d由磁体318吸引而停下。FIG. 14( a ) shows the state when the disk 301 is stopped, and the balls 324 a , 324 b , 324 c , and 324 d are attracted by the magnet 318 to stop.

图14(b)示出盘片301加速初始状态，盘片301的转速较低，此时有[离心力]<[磁力]这一关系，因而滚珠324a、324b、324c、324d仍为磁体318所吸引，沿磁体318外周面移动。图14(b)中，盘片301沿右旋方向(顺时针方向)旋转，滚珠324a、324b、324c、324d因惯性沿磁体318外周面移动，从而按盘片301旋转方向相反的左旋方向旋转。Figure 14(b) shows the initial state of the acceleration of the disk 301. The rotation speed of the disk 301 is relatively low. At this time, there is a relationship of [centrifugal force]<[magnetic force]. Attract and move along the outer peripheral surface of the magnet 318. In Fig. 14(b), the disk 301 rotates in the right-handed direction (clockwise), and the balls 324a, 324b, 324c, 324d move along the outer peripheral surface of the magnet 318 due to inertia, thereby rotating in the left-handed direction opposite to the rotation direction of the disk 301. .

图14(c)示出盘片301加速中期状态，盘片301转速较高，此时有[离心力]>[磁力]这一关系，滚珠324a、324b、324c、324d脱离磁体318，到达圆弧状平衡室323a、323b、323c、323d的内侧外周壁面325a、325b、325c、325d。此时，滚珠324a、324b、324c、324d仍然按盘片301相反方向移动，与各间隔330a、330b、330c、330d接触后停下。Figure 14(c) shows the mid-acceleration state of the disk 301. The rotation speed of the disk 301 is relatively high. At this time, there is a relationship of [centrifugal force]>[magnetic force]. The inner peripheral wall surfaces 325a, 325b, 325c, 325d of the shape balance chambers 323a, 323b, 323c, 323d. At this time, the balls 324a, 324b, 324c, and 324d still move in the opposite direction of the disk 301, and stop after contacting each space 330a, 330b, 330c, and 330d.

图14(d)示出盘片301加速末期状态，表示盘片301振摆旋转振幅增大的状态。底盘座306的振摆旋转振动的振幅也因该影响增大。此时，底盘座306振摆旋转振动的跟随方向和晃动方向振动的相位差为90度，因而滚珠324a、324b、324c、324d在与盘片301的重心具有90度偏移(图14(d)左侧)方向上移动，使得滚珠324a、324b、324c、324d的离心力合力集中。FIG. 14(d) shows the state at the end of the acceleration of the disk 301, showing the state in which the amplitude of the wobble rotation of the disk 301 increases. The amplitude of the whirling rotational vibration of the chassis base 306 is also increased by this effect. At this time, the phase difference between the following direction of the vibration of the chassis base 306 and the vibration in the shaking direction is 90 degrees, so the balls 324a, 324b, 324c, 324d have a 90 degree offset with the center of gravity of the disc 301 (Fig. 14(d) ) to the left) to move in the direction, so that the resultant centrifugal force of the balls 324a, 324b, 324c, and 324d is concentrated.

图14(e)示出盘片301加速结束的状态，表示盘片301的转速达到最高速度(最高旋转频率)100Hz的状态。FIG. 14(e) shows the state in which the acceleration of the disk 301 is completed, and shows the state in which the rotational speed of the disk 301 has reached the maximum speed (maximum rotation frequency) of 100 Hz.

此时，底盘座306的振摆旋转振动其记录轨跟随方向(驱动读写头方向)和晃动方向(与记录轨跟随方向相正交方向)的振动相位差为180度。因此，滚珠324a、324b、324c、324d在与盘片301的重心具有180度偏移(图14(e)下侧)方向上移动，使得滚珠324a、324b、324c、324d的离心力合力集中。所以，可充分消除盘片301的质量失衡，底盘座306的振摆旋转振动受到抑制。At this time, the vibration phase difference between the pendulum rotation vibration of the chassis base 306 in the recording track following direction (direction to drive the read-write head) and the shaking direction (orthogonal direction to the recording track following direction) is 180 degrees. Therefore, the balls 324a, 324b, 324c, 324d move in a direction offset by 180 degrees from the center of gravity of the disk 301 (the lower side in FIG. Therefore, the mass imbalance of the disk 301 can be fully eliminated, and the whirling and rotating vibration of the chassis base 306 can be suppressed.

接下来，说明第七实施例的盘片驱动装置按100Hz高速旋转频率旋转没有质量失衡且质量平衡均匀的盘片301时滚珠324a、324b、324c、324d的移动状态。Next, the moving states of the balls 324a, 324b, 324c, and 324d when the disk drive device of the seventh embodiment rotates the disk 301 with no mass imbalance and uniform mass balance at a high-speed rotation frequency of 100 Hz will be described.

图15示出的是盘片驱动装置上装上没有质量失衡且均匀的盘片301并加速旋转时夹紧机构316内滚珠324a、324b、324c、324d位置随时间的变化。图15中，随着盘片301转速增加，平衡器状态按空心箭头方向变化。图15所示场合，盘片301没有质量失衡，因而省略重心G的表示。而且，盘片301的重心G和间隔330之间的位置关系也因该盘片301没有质量失衡而忽略。FIG. 15 shows the time-dependent changes in the positions of the balls 324a, 324b, 324c, and 324d in the clamping mechanism 316 when a uniform disc 301 with no mass imbalance is mounted on the disc drive and rotates at an accelerated rate. In FIG. 15 , as the rotation speed of the disk 301 increases, the state of the balancer changes in the direction of the hollow arrow. In the case shown in FIG. 15, since the disc 301 has no mass imbalance, the illustration of the center of gravity G is omitted. Also, the positional relationship between the center of gravity G of the disk 301 and the gap 330 is ignored because the disk 301 has no mass imbalance.

图15(a)示出盘片301停转时的状态，具有磁性的各滚珠324a、324b、324c、324d由磁体318吸引。FIG. 15( a ) shows the state when the disk 301 is stopped, and the magnetic balls 324 a , 324 b , 324 c , and 324 d are attracted by the magnet 318 .

图15(b)示出盘片301加速初始状态，盘片301的转速较低，因而此时有[离心力]<[磁力]这一关系，因而滚珠324a、324b、324c、324d仍处于为磁体318所吸引状态。此时，盘片301沿右旋方向(顺时针方向)旋转，滚珠324a、324b、324c、324d因惯性沿磁体318外周面移动，从而按盘片301旋转方向相反的左旋方向(逆时针方向)旋转。Figure 15(b) shows the initial state of the acceleration of the disc 301, the rotational speed of the disc 301 is relatively low, so there is a relationship of [centrifugal force]<[magnetic force] at this time, so the balls 324a, 324b, 324c, 324d are still in the position of magnets 318 attracted states. At this time, the disk 301 rotates in the right-handed direction (clockwise), and the balls 324a, 324b, 324c, 324d move along the outer peripheral surface of the magnet 318 due to inertia, thereby following the left-handed direction (counterclockwise) opposite to the rotation direction of the disk 301. rotate.

图15(c)示出盘片301加速中期状态，盘片301转速较高，此时有[离心力]>[磁力]这一关系，滚珠324a、324b、324c、324d脱离磁体318，到达圆弧状平衡室323a、323b、323c、323d的内侧外周壁面325a、325b、325c、325d。此时，滚珠324a、324b、324c、324d仍然按盘片301相反方向移动，与各间隔330a、330b、330c、330d接触后停下。Fig. 15(c) shows the mid-acceleration state of the disk 301, the rotation speed of the disk 301 is relatively high, there is a relationship of [centrifugal force] > [magnetic force] at this time, the balls 324a, 324b, 324c, 324d are separated from the magnet 318 and reach the arc The inner peripheral wall surfaces 325a, 325b, 325c, 325d of the shape balance chambers 323a, 323b, 323c, 323d. At this time, the balls 324a, 324b, 324c, and 324d still move in the opposite direction of the disk 301, and stop after contacting each space 330a, 330b, 330c, and 330d.

图15(d)示出盘片301加速末期状态，滚珠324a、324b、324c、324d稳定在与各自间隔330a、330b、330c、330d相接触位置上。Fig. 15(d) shows the final state of the acceleration of the disk 301, and the balls 324a, 324b, 324c, 324d are stabilized at the positions in contact with the respective spaces 330a, 330b, 330c, 330d.

这样，间隔330a、330b、330c、330d按盘片301旋转中心的转角(以下简称为中心角)每隔90度均匀角间距设置，因而滚珠324a、324b、324c、324d稳定在与间隔330a、330b、330c、330d相接触位置上。由此，滚珠324a、324b、324c、324d等间距配置，完全没有滚珠324a、324b、324c、324d配置所产生的失衡。In this way, the intervals 330a, 330b, 330c, and 330d are arranged at uniform angular intervals of 90 degrees according to the rotation angle of the rotation center of the disk 301 (hereinafter referred to as the central angle). , 330c, 330d are in contact with each other. Thus, the balls 324a, 324b, 324c, and 324d are arranged at equal intervals, and there is no imbalance caused by the arrangement of the balls 324a, 324b, 324c, and 324d.

本发明第七实施例盘片驱动装置的平衡器221是就按中心角每隔90度的均匀角间距设有4个对环状轨道的中空环状部320进行分割的间隔这种场合进行说明的，但如图16～图20所示，对中空环状部320进行分割的间隔个数不限于4个，由2、3、4、6、8个左右的间隔分割中空环状部320也可获得相同效果。图16～图20中，与上述第七实施例盘片驱动装置中组成相同功能的部件标注相同标号，并且对相同组成为多个时依次在该组成标号后标注小写字母(a，b，c，…)。尽管未图示并省略，但间隔数目为5个或7个也能得到与上述实施例相同的效果。The balancer 221 of the disk drive device in the seventh embodiment of the present invention will be described in the case where four intervals are provided for dividing the hollow annular portion 320 of the annular track at uniform angular intervals of 90 degrees at a central angle. However, as shown in FIGS. 16 to 20, the number of intervals for dividing the hollow annular portion 320 is not limited to four, and the hollow annular portion 320 is also divided by about 2, 3, 4, 6, or 8 intervals. The same effect can be obtained. In Figures 16 to 20, the parts with the same functions as those in the disk drive device of the seventh embodiment above are labeled with the same symbols, and when the same components are multiple, lowercase letters (a, b, c) are marked after the component labels in turn. ,...). Although not shown and omitted, the same effect as that of the above-described embodiment can be obtained even if the number of intervals is five or seven.

本发明第七实施例的盘片驱动装置中，是采用图13所示的间隔形状的部件作为中空环状部320分割部件进行说明的，但利用滚珠、圆柱、立方体、盘状部件、板状部件等固体部件作为在中空环状部320内所封入的平衡部件时，对中空环状部320进行分割的部件不需要是间隔形状的部件。例如，也可以构成为从图21所示的中空环状部320的内侧外周壁面325的局部向其内侧突出设置的突起形状部件331a、331b、331c、331d，并让上述平衡部件在各圆弧状平衡室323a、323b、323c、323d内可移动。而且还构成为在图22所示中空环状部320的环状空间内留有规定间距形成柱状部件332a、332b、332c、332d，滚珠324a、324b、324c、324d等固体平衡部件不可以移动到相邻平衡室323a、323b、323c、323d。通过如上所述分割中空环状部320，可获得与用间隔330a、330b、330c、330d分割中空环状部320时相同的效果。In the disk drive device of the seventh embodiment of the present invention, the interval-shaped members shown in FIG. When a solid member such as a member is used as a balance member enclosed in the hollow annular portion 320 , the member that divides the hollow annular portion 320 does not need to be a spacer-shaped member. For example, it may also be configured as protrusion-shaped members 331a, 331b, 331c, 331d protruding inwardly from part of the inner peripheral wall surface 325 of the hollow annular portion 320 shown in FIG. It can move in the shape balance chamber 323a, 323b, 323c, 323d. Moreover, it is also configured to leave predetermined intervals to form columnar members 332a, 332b, 332c, 332d in the annular space of the hollow annular portion 320 shown in FIG. Adjacent balancing chambers 323a, 323b, 323c, 323d. By dividing the hollow annular portion 320 as described above, the same effect as when the hollow annular portion 320 is divided by the intervals 330a, 330b, 330c, and 330d can be obtained.

本发明第七实施例的盘片驱动装置，尽管滚珠324a、324b、324c、324d用磁性材料构成，但用非磁性材料构成滚珠作为平衡部件，第七实施例盘片驱动装置也可抑制质量失衡的盘片的振动。In the disk drive device of the seventh embodiment of the present invention, although the balls 324a, 324b, 324c, and 324d are made of magnetic materials, the balls are made of non-magnetic materials as the balance member, and the disk drive device of the seventh embodiment can also suppress mass imbalance. vibration of the disc.

如本发明第七实施例那样，在夹紧机构316上设置平衡器221时，由于利用了其他组成部分较少的盘片301上方空间，因而还可以将中空环状部320的直径形成得更大，或增加每一个滚珠的质量或滚珠个数。因而，通过加大中空环状部320的直径，或增加每一个滚珠的质量或滚珠个数，即便对于质量失衡更加大的盘片也能充分抑制振动。Like the seventh embodiment of the present invention, when the balancer 221 is arranged on the clamping mechanism 316, the diameter of the hollow annular portion 320 can also be formed to be larger due to the utilization of the space above the disk 301 with fewer other components. Larger, or increase the quality of each ball or the number of balls. Therefore, by enlarging the diameter of the hollow annular portion 320 or increasing the mass of each ball or the number of balls, vibration can be sufficiently suppressed even for a disc with a greater mass imbalance.

本发明第七实施例的盘片驱动装置，说明的是在夹紧机构316中设置平衡器221的例子，但对于其他结构，若与盘片301旋转中心同轴地配置中空环状部320，并且设置成可与盘片301一体旋转的话，也可以获得与上述第七实施例相同的效果。例如，在装上盘片301的转台310上设置平衡器，或在主轴电动机302的转子部设置平衡器，或在底盘座306的主轴电动机302相对一侧设置平衡器，并将中空环状部配置成可与主轴电动机的转轴321一体旋转，也具有与上述第七实施例相同的效果。In the disk drive device of the seventh embodiment of the present invention, the example in which the balancer 221 is provided in the clamping mechanism 316 has been described, but for other configurations, if the hollow ring portion 320 is arranged coaxially with the rotation center of the disk 301, And if it is arranged to be able to rotate integrally with the disk 301, the same effect as that of the above-mentioned seventh embodiment can also be obtained. For example, a balancer is provided on the turntable 310 on which the disc 301 is loaded, or a balancer is provided on the rotor portion of the spindle motor 302, or a balancer is provided on the opposite side of the spindle motor 302 of the chassis base 306, and the hollow ring portion Arranging to be rotatable integrally with the rotating shaft 321 of the spindle motor also has the same effect as that of the above-mentioned seventh embodiment.

本发明第七实施例的盘片驱动装置中，容纳滚珠的中空环状部320的形状形成为内侧外周壁面325a、325b、325c、325d具有相同半径的圆环状。但本发明的盘片驱动装置，多个中空环状部未必需要具有相同半径的圆环形状。例如，如图23所示组合多个间隔343a、343b、343c、343d和半径不同的内侧外周壁面325a、325b、325c、325d所形成的2类圆弧状平衡室323a、230b、323c、230d，也可获得与上述第七实施例相同的效果。In the disk drive device according to the seventh embodiment of the present invention, the shape of the hollow ring portion 320 accommodating the balls is a ring shape in which the inner and outer peripheral walls 325a, 325b, 325c, and 325d have the same radius. However, in the disk drive device of the present invention, the plurality of hollow annular portions do not necessarily need to have the same radius of the ring shape. For example, as shown in Figure 23, two types of arc-shaped balance chambers 323a, 230b, 323c, 230d formed by combining a plurality of intervals 343a, 343b, 343c, 343d and inner peripheral wall surfaces 325a, 325b, 325c, 325d with different radii, The same effects as those of the seventh embodiment described above can also be obtained.

图24是示意第七实施例一例其他平衡器构成的平面剖面图(a)和一例另一平衡器构成的纵向剖面图(b)。图24(a)所示实施例中，在半径方向上以重复即双重方式配置有多个间隔344a、344b、344c、344d所形成的中心角大致180度的圆弧状平衡室323a、323b、323c、323d作为盘片驱动装置中的中空环状部320。利用此结构也可以获得与上述第七实施例相同的效果。图24(a)所示的平衡器221的形状给出的是圆弧状平衡室323a、323b、323c、323d内侧和外侧大致相差90度的结构。图24(a)的平衡器221给出的是在半径方向上有双重圆弧状平衡室323a、323b、323c、323d的结构。即便是如图13(b)所示，在盘片301旋转轴方向上配置双重相同直径的圆弧状平衡室，并使间隔位置配置成大致错开90度的结构，也可以获得与上述第七实施例相同的效果。Fig. 24 is a plane sectional view (a) showing an example of another balancer structure of the seventh embodiment and a longitudinal sectional view (b) of another example of the balancer structure. In the embodiment shown in Fig. 24 (a), in the radial direction, circular arc-shaped balance chambers 323a, 323b, 323b, 323b, and 323c, 323d serve as the hollow annular portion 320 in the disk drive device. Also with this structure, the same effect as that of the seventh embodiment described above can be obtained. The shape of the balancer 221 shown in FIG. 24(a) is a structure in which the inside and outside of the arc-shaped balance chambers 323a, 323b, 323c, and 323d differ by approximately 90 degrees. What the balancer 221 of Fig. 24 (a) provided is the structure that there are double-arc-shaped balance chambers 323a, 323b, 323c, 323d in the radial direction. Even if it is shown in Fig. 13 (b), arrange double arc-shaped balance chambers with the same diameter in the direction of the rotation axis of the disk 301, and make the interval position be arranged to be roughly staggered by 90 degrees, it is also possible to obtain the structure similar to the seventh one. Embodiment same effect.

《第八实施例》"Eighth Embodiment"

接下来参照附图说明本发明第八实施例的盘片驱动装置。图25、图26和图27是示意本发明第八实施例盘片驱动装置中夹紧机构设置的平衡器222其内部结构的平面剖面图。另外，对于与上述第七实施例的盘片驱动装置组成具有实际相同功能的组成来说，标注相同标号，通过引用先前实施例的说明，省略重复说明。而且，第八实施例的平衡器222与上述图12所示的纵向剖面图中的平衡器221具有相同表示，故省略第八实施例的平衡器222的纵向剖面图。Next, a disk drive device according to an eighth embodiment of the present invention will be described with reference to the drawings. Fig. 25, Fig. 26 and Fig. 27 are plan sectional views showing the internal structure of the balancer 222 provided for the clamping mechanism in the disk drive device according to the eighth embodiment of the present invention. In addition, components having substantially the same functions as those of the disk drive device of the seventh embodiment described above are given the same reference numerals, and repeated explanations are omitted by citing the descriptions of the previous embodiments. Moreover, the balancer 222 of the eighth embodiment has the same representation as the balancer 221 in the longitudinal sectional view shown in FIG. 12 , so the longitudinal sectional view of the balancer 222 of the eighth embodiment is omitted.

本发明第八实施例的盘片驱动装置，是在上述第七实施例中夹紧机构316(图12)上设置的中空环状部320设有弹性体的装置。该弹性体贴着分割中空环状部320的间隔，或者间隔本身由弹性体构成。The disk drive device according to the eighth embodiment of the present invention is a device in which the hollow ring portion 320 provided on the clamping mechanism 316 ( FIG. 12 ) in the seventh embodiment is provided with an elastic body. The elastic body is attached to the space dividing the hollow annular portion 320, or the space itself is made of an elastic body.

对于如上所述在平衡器222中设有弹性体的第八实施例的盘片驱动装置，说明竖直放置盘片驱动装置进行驱动的场合。With respect to the disc drive unit of the eighth embodiment in which the elastic body is provided in the balancer 222 as described above, a case where the disc drive unit is vertically placed and driven will be described.

使上述第七实施例中图12所示的盘片驱动装置竖直置放并动作的场合，使得盘片301记录面为竖直方向的夹紧机构316保持着进行驱动。盘片驱动装置竖直放置来高速旋转盘片301时，对于夹紧机构316的中空环状部320的各个圆弧状平衡室323a、323b、323c、323d内容纳的滚珠324a、324b、324c、324d来说，离心力的影响超过重力为主要的，因而处于与中空环状部320的内侧外周壁面325a、325b、325c、325d紧贴的状态。在此状态下，滚珠324a、324b、324c、324d不容易移动。When the disk drive device shown in FIG. 12 in the seventh embodiment is vertically placed and operated, the clamp mechanism 316 that makes the recording surface of the disk 301 vertical is kept and driven. When the disk driving device is placed vertically to rotate the disk 301 at high speed, the balls 324a, 324b, 324c, 324d, since the influence of centrifugal force is more dominant than that of gravity, it is in a state of close contact with the inner peripheral wall surfaces 325a, 325b, 325c, and 325d of the hollow annular portion 320. In this state, the balls 324a, 324b, 324c, 324d are not easily moved.

但低速旋转盘片301时或旋转刚开始后的低速旋转时，作用于各滚珠324a、324b、324c、324d的离心力减小，因而重力的影响是主要的，脱离磁体318的滚珠324a、324b、324c、324d和间隔330a、330b、330c、330d相碰撞，产生噪声。However, when the disc 301 is rotated at a low speed or when the rotation is started at a low speed, the centrifugal force acting on each ball 324a, 324b, 324c, 324d decreases, so the influence of gravity is the main one. The balls 324a, 324b, 324c, 324d and spaces 330a, 330b, 330c, 330d collide, generating noise.

如图25所示，间隔330a、330b、330c、330d的两面均贴着弹性体333。因此，低速旋转盘片301时，滚珠324a、324b、324c、324d和间隔330a、330b、330c、330d碰撞时所产生的噪声大幅减小。弹性体333的材料为天然橡胶、合成橡胶、海绵等可吸收滚珠324a、324b、324c、324d与间隔330之间碰撞时冲击的冲击吸收材料就行。As shown in FIG. 25 , both sides of the spacers 330 a , 330 b , 330 c , and 330 d are attached to the elastic body 333 . Therefore, when the disk 301 is rotated at a low speed, the noise generated when the balls 324a, 324b, 324c, 324d collide with the spaces 330a, 330b, 330c, 330d is greatly reduced. The elastic body 333 is made of natural rubber, synthetic rubber, sponge and other impact-absorbing materials that can absorb the impact when the balls 324a, 324b, 324c, 324d collide with the spacer 330.

图26是示意第八实施例中平衡器222的间隔用弹性体构成的例子的平面剖面图。如图26所示，由于在中空环状部320上形成弹性体间隔334a、334b、334c、334d，因而可获得与上述图25所示的平衡器222相同的效果。为了这样用弹性体形成间隔334a、334b、334c、334d并对中空环状部320进行分割，可将间隔334a、334b、334c、334d牢固地与平衡器222固定或粘接，以便间隔334a、334b、334c、334d充分吸收滚珠324a、324b、324c、324d造成的冲击，并实现成为间隔的功能。作为弹性体材料来说，为可吸收滚珠324a、324b、324c、324d碰撞所产生的冲击的材料就行，例如天然橡胶、合成橡胶等冲击吸收材料即可。Fig. 26 is a plan sectional view showing an example in which the spacer of the balancer 222 is formed of an elastic body in the eighth embodiment. As shown in FIG. 26, since the elastic body spaces 334a, 334b, 334c, and 334d are formed in the hollow annular portion 320, the same effect as that of the balancer 222 shown in FIG. 25 described above can be obtained. In order to form the spacers 334a, 334b, 334c, 334d with elastic bodies and divide the hollow annular part 320, the spacers 334a, 334b, 334c, 334d can be firmly fixed or bonded to the balancer 222 so that the spacers 334a, 334b , 334c, 334d fully absorb the impact caused by the balls 324a, 324b, 324c, 324d, and realize the function of being a spacer. As for the elastic body material, any material that can absorb the impact generated by the collision of the balls 324a, 324b, 324c, and 324d is sufficient, such as natural rubber, synthetic rubber, and other impact-absorbing materials.

但由于图26所示的中空环状部320的间隔334a、334b、334c、334d仅仅用弹性体形成，因而也可能发生作为间隔的刚性不足。因此，也可以如图27所示设置平衡器222，覆盖弹性体材料成型的管状间隔保持体336来包围磁体318外周，并具有从该间隔保持体336的外周面放射状突出的一体成型的间隔335a、335b、335c、335d。图27所示的平衡器222中的间隔335a、335b、335c、335d可确保成为间隔的刚性，可以吸收间隔335a、335b、335c、335d和滚珠324a、324b、324c、324d碰撞所产生的冲击，大幅减小噪声。图27所示间隔335a、335b、335c、335d的弹性体材料，为可用天然橡胶、合成橡胶等冲击吸收材料成型为图27所示间隔335a、335b、335c、335d特殊形状的材料即可。However, since the spaces 334a, 334b, 334c, and 334d of the hollow annular portion 320 shown in FIG. 26 are formed only with elastic bodies, insufficient rigidity of the spaces may occur. Therefore, as shown in FIG. 27 , the balancer 222 can also be provided, covering the tubular spacer 336 formed by the elastomer material to surround the outer periphery of the magnet 318, and having an integrally formed spacer 335a protruding radially from the outer peripheral surface of the spacer 336. , 335b, 335c, 335d. The intervals 335a, 335b, 335c, and 335d in the balancer 222 shown in FIG. 27 can ensure the rigidity of the intervals, and can absorb the impact generated by the collision between the intervals 335a, 335b, 335c, and 335d and the balls 324a, 324b, 324c, and 324d. Significantly reduces noise. The elastomer material of intervals 335a, 335b, 335c, and 335d shown in Figure 27 can be formed into special shapes of intervals 335a, 335b, 335c, and 335d shown in Figure 27 by impact-absorbing materials such as natural rubber and synthetic rubber.

如上所述，本发明第八实施例的盘片驱动装置，在竖直放置盘片驱动装置使之工作的场合，低速旋转盘片301时，减小滚珠与间隔之间碰撞所产生的噪声。As described above, the disk drive device according to the eighth embodiment of the present invention reduces the noise generated by the collision between the balls and the spacer when the disk drive device is operated vertically and rotates the disk 301 at a low speed.

上述第七实施例的盘片驱动装置中，竖直放置盘片驱动装置并低速旋转盘片301时，为了避免滚珠与间隔之间碰撞所产生的噪声，构成为滚珠采用磁性材料，低速旋转时由磁体318吸引，高速旋转时滚珠由于离心力从磁体上脱离。In the disk drive device of the seventh embodiment above, when the disk drive device is placed vertically and the disk 301 is rotated at a low speed, in order to avoid the noise generated by the collision between the balls and the spacers, the balls are made of magnetic materials, and when rotating at a low speed Attracted by the magnet 318, the ball is detached from the magnet due to centrifugal force during high-speed rotation.

但本发明第八实施例的盘片驱动装置中，由于间隔设有弹性体，因而可大幅减小滚珠与间隔之间的碰撞声。因此，第八实施例中不需要在低速旋转时由磁体吸住滚珠，对于滚珠材料，不论采用是否有磁性的材料，都可以大幅抑制噪声发生。However, in the disc drive device according to the eighth embodiment of the present invention, since the spacer is provided with an elastic body, the collision sound between the ball and the spacer can be greatly reduced. Therefore, in the eighth embodiment, there is no need for magnets to hold the balls during low-speed rotation, and no matter whether the materials of the balls are magnetic or not, the occurrence of noise can be greatly suppressed.

另外，上述第八实施例是就4个间隔的情形进行说明的，但本发明盘片驱动装置的间隔数目不限于4个，即便用2～8个左右的间隔分割中空环状部，也能获得与上述第八实施例相同的效果。In addition, the above-mentioned eighth embodiment is described with respect to the situation of 4 spaces, but the number of spaces of the disk drive device of the present invention is not limited to 4, and even if the hollow annular part is divided by about 2 to 8 spaces, it can The same effects as those of the eighth embodiment described above are obtained.

第八实施例的间隔是将中空环状部完全分割的间隔形状，但本发明不限于这种构成，平衡部件是在可移动空间中形成的构成就行。例如，间隔也可以如上述图21所示，构成为弹性体贴着中空环状部的部分内侧外周壁面其突出设置于内侧的突起上，还可以如上述图22所示，构成为弹性体贴着中空环状部其环状空间内设置的柱状体部。通过这样构成，可减小平衡部件即滚珠等与间隔之间的碰撞声，获得与间隔情形相同的效果。The space in the eighth embodiment is a space shape that completely divides the hollow annular portion, but the present invention is not limited to this configuration, and it is sufficient that the balance member is formed in the movable space. For example, as shown in the above-mentioned FIG. 21, the spacer can also be configured as an elastic body sticking to the part of the inner peripheral wall surface of the hollow ring-shaped part, which protrudes on the inner protrusion, or as shown in the above-mentioned FIG. The annular part is a cylindrical body part arranged in the annular space. With such a configuration, it is possible to reduce the collision sound between the balls, which are the balance members, and the spacer, and obtain the same effect as in the case of the spacer.

本发明第八实施例的盘片驱动装置，给出的是夹紧机构316上设置平衡器222的构成。但对于与此不同的构成，若与盘片301旋转中心同轴、并与盘片301可一体旋转地设置中空环状部320的话，也可以获得与上述第八实施例相同的效果。例如，在装上盘片301的转台310上设置平衡器，或在主轴电动机302的转子部设置平衡器，或在底盘座306的主轴电动机302相对一侧设置平衡器，并将平衡器构成为可与主轴电动机转轴321一体旋转，便可得到与上述第八实施例相同的效果。The disc drive device in the eighth embodiment of the present invention provides a structure in which the clamping mechanism 316 is provided with a balancer 222 . However, in a configuration different from this, if the hollow annular portion 320 is provided coaxially with the rotation center of the disk 301 and rotatable integrally with the disk 301, the same effect as that of the above-mentioned eighth embodiment can be obtained. For example, a balancer is provided on the turntable 310 on which the disc 301 is mounted, or a balancer is provided on the rotor portion of the spindle motor 302, or a balancer is provided on the opposite side of the chassis base 306 to the spindle motor 302, and the balancer is constituted as It can rotate integrally with the spindle motor shaft 321 to obtain the same effect as the above-mentioned eighth embodiment.

《第九实施例》"Ninth Embodiment"

接下来参照附图说明本发明第九实施例的盘片驱动装置。图28是示意本发明第九实施例盘片驱动装置中夹紧机构设有的平衡器223其内部结构的平面剖面图。另外，对于与上述第七实施例和第八实施例的盘片驱动装置组成具有实际相同功能的组成来说，标注相同标号，通过引用先前实施例的说明，省略重复说明。而且，第九实施例的平衡器223与上述图12所示的纵向剖面图中的平衡器221具有相同表示，故省略第九实施例的平衡器223的纵向剖面图。Next, a disk drive device according to a ninth embodiment of the present invention will be described with reference to the drawings. FIG. 28 is a plan sectional view showing the internal structure of a balancer 223 provided in the clamping mechanism of the disk drive device according to the ninth embodiment of the present invention. In addition, components having substantially the same functions as those of the disk drive apparatus of the seventh and eighth embodiments described above are denoted by the same reference numerals, and repeated descriptions are omitted by citing the descriptions of the previous embodiments. Moreover, the balancer 223 of the ninth embodiment has the same representation as the balancer 221 shown in the longitudinal sectional view of FIG. 12 , so the longitudinal sectional view of the balancer 223 of the ninth embodiment is omitted.

第九实施例的盘片驱动装置，是解决上述第七实施例和第八实施例盘片驱动装置中尽管发生频率低但总有可能存在的滚珠324移动不到最佳位置这一问题的，以下说明解决该问题的对策。The disc drive device of the ninth embodiment solves the problem that the ball 324 may not move to the optimal position in the disc drive devices of the seventh embodiment and the eighth embodiment, although the frequency of occurrence is low. A countermeasure to solve this problem will be described below.

第九实施例的盘片驱动装置，关注作为平衡部件的滚珠324a、324b、324c、324d的移动力R。以最高速度旋转盘片301时，夹紧机构316的中空环状部320所容纳的滚珠324a、324b、324c、324d所受到的作用力R1、R2、R3、R4如上述图13(a)和图13(b)中箭头所示。具体用可知道各滚珠324a、324b、324c、324d位置和移动力R1、R2、R3、R4之间关系的图13(b)进行以下说明。In the disk drive device of the ninth embodiment, attention is paid to the moving force R of the balls 324a, 324b, 324c, and 324d as the balance member. When the disk 301 is rotated at the highest speed, the forces R1, R2, R3, and R4 received by the balls 324a, 324b, 324c, and 324d received by the hollow ring portion 320 of the clamping mechanism 316 are as shown in the above-mentioned Fig. 13(a) and Indicated by the arrow in Figure 13(b). Specifically, the following description will be given using FIG. 13(b) in which the relationship between the positions of the balls 324a, 324b, 324c, and 324d and the moving forces R1, R2, R3, and R4 can be known.

若对比作用于各滚珠324a、324b、324c、324d各移动力R1、R2、R3、R4的大小，具有质量失衡的盘片301上距离其重心G错开大约90度位置的滚珠324b、324c所受到的移动力R2、R3，比错开大约180度位置的滚珠324a、324d所受到的移动力R1、R4大很多。这样移动力R1、R2、R3、R4随盘片301的重心G和滚珠324a、324b、324c、324d所夹的角度有很大差异。若在0～180度区间求移动力R的话，0度和180度位置给出移动力R最小值，90度位置给出移动力R最大值。Comparing the magnitudes of the moving forces R1, R2, R3, and R4 acting on the balls 324a, 324b, 324c, and 324d, the balls 324b, 324c on the disc 301 with an unbalanced mass are displaced by about 90 degrees from their center of gravity G. The moving forces R2, R3 of the balls are much larger than the moving forces R1, R4 received by the balls 324a, 324d at positions staggered by about 180 degrees. In this way, the moving forces R1 , R2 , R3 , R4 vary greatly with the angles between the center of gravity G of the disk 301 and the balls 324 a , 324 b , 324 c , 324 d. If the moving force R is calculated in the range of 0 to 180 degrees, the minimum value of the moving force R is given at the positions of 0 degrees and 180 degrees, and the maximum value of the moving force R is given at the position of 90 degrees.

由于存在这种滚珠位置和移动力R之间关系，因而第七实施例和第八实施例产生这样的问题，即，总有可能在盘片301的重心G一侧留有滚珠，有时便无法充分改善失衡。Due to the existence of such a relationship between the position of the ball and the moving force R, the seventh and eighth embodiments have a problem that there is always a possibility that there is a ball on the side of the center of gravity G of the disc 301, and sometimes it cannot be moved. Fully improve the imbalance.

以下，举具体的例子说明上述第七实施例中平衡器滚珠移动不到最佳位置这种问题的发生机理。Hereinafter, a specific example will be used to describe the mechanism of occurrence of the problem that the balls of the balancer do not move to the optimum position in the above-mentioned seventh embodiment.

图29是第七实施例中成为问题的平衡器滚珠移动不到最佳位置情形的说明图。图29(a)至图29(c)与上述图14(a)至图14(c)中所示的中空环状部内移动的滚珠随时变化的状态相同。图29中，随盘片301转速的增加，平衡器状态按空心箭头方向变化。Fig. 29 is an explanatory diagram of a situation where the balancer balls do not move to the optimum position, which becomes a problem in the seventh embodiment. Fig. 29(a) to Fig. 29(c) are the same as the states of the balls moving in the hollow annular part shown in Fig. 14(a) to Fig. 14(c) changing over time. In FIG. 29 , as the rotation speed of the disc 301 increases, the state of the balancer changes in the direction of the hollow arrow.

如图29(e)所示，滚珠324a留在盘片301距离重心基本上0度位置，即失衡一侧。研究其原因，发明人发现如下发生机理。As shown in FIG. 29(e), the ball 324a is left at a position of substantially 0 degrees from the center of gravity of the disc 301, that is, on the unbalanced side. Investigating the reason for this, the inventors found the following mechanism of occurrence.

图29(a)至图29(c)处于与上述图14所示滚珠324a、324b、324c、324d相同位置。但图29(d)所示状态下，滚珠324a、324b、324c、324d的离心力合力集中于左侧，但作用于右下滚珠324b的移动力R小，因而滚珠324b留在右侧。Fig. 29(a) to Fig. 29(c) are in the same positions as the balls 324a, 324b, 324c, 324d shown in Fig. 14 above. But under the state shown in Fig. 29 (d), the resultant centrifugal force of the balls 324a, 324b, 324c, 324d is concentrated on the left side, but the moving force R acting on the lower right ball 324b is small, so the ball 324b stays on the right side.

而盘片301以最高速度旋转时的图29(e)状态下，滚珠324a、324b、324c、324d的离心力合力集中于下侧，但滚珠324a由于其移动力R小，因而留在上侧。此时，滚珠324b在其移动力R增加下移动至下侧。因而，上述第七实施例中，盘片301达到最高速度时，有时多个滚珠324a、324b、324c、324d中至少一个留在盘片301的失衡一侧，未配置在适当位置上，所以存在滚珠324a、324b、324c、324d适当配置消除盘片301质量失衡的效果有时大幅下降这种问题。In the state of FIG. 29(e) when the disc 301 rotates at the highest speed, the resultant centrifugal force of the balls 324a, 324b, 324c, and 324d is concentrated on the lower side, but the ball 324a stays on the upper side due to its small moving force R. At this time, the ball 324b moves to the lower side with its moving force R increased. Therefore, in the above-mentioned seventh embodiment, when the disc 301 reaches the highest speed, sometimes at least one of the plurality of balls 324a, 324b, 324c, 324d remains on the unbalanced side of the disc 301 and is not arranged in an appropriate position, so there is a Proper arrangement of the balls 324a, 324b, 324c, and 324d may greatly reduce the effect of eliminating the mass imbalance of the disc 301.

为了解决上述问题，本发明第九实施例的盘片驱动装置中，如图28所示，各个圆弧状平衡室323a、323b、323c、323d的内侧外周壁面325a、325b、325c、325d其圆弧中心点形成为稍稍偏离盘片301的旋转中心。图28中，从圆弧的中心至各内侧外周壁面325a、325b、325c、325d的半径用箭头表示。若盘片301的旋转中心和内侧外周壁面325a、325b、325c、325d的圆弧中心一致的话，盘片301旋转时产生的滚珠324a、324b、324c、324d的离心力Q，是与内侧外周壁面325a、325b、325c、325d所受到的支持力N在一直线上作用于各个滚珠324a、324b、324c、324d的。因此，未产生使滚珠324a、324b、324c、324d移动的移动力R。In order to solve the above problems, in the disk drive device of the ninth embodiment of the present invention, as shown in FIG. The arc center point is formed slightly away from the rotation center of the disk 301 . In FIG. 28, the radii from the center of the arc to the respective inner peripheral wall surfaces 325a, 325b, 325c, and 325d are indicated by arrows. If the rotation center of the disk 301 coincides with the arc centers of the inner peripheral wall surfaces 325a, 325b, 325c, and 325d, the centrifugal force Q of the balls 324a, 324b, 324c, and 324d generated when the disk 301 rotates is equal to that of the inner peripheral wall surface 325a. , 325b, 325c, 325d received supporting force N acts on each ball 324a, 324b, 324c, 324d in a straight line. Therefore, the moving force R for moving the balls 324a, 324b, 324c, and 324d is not generated.

但如图28所示，使中空环状部320各内侧外周壁面325a、325b、325c、325d的圆弧的中心与盘片301的旋转中心错开时，由于盘片301旋转而在滚珠324a、324b、324c、324d上产生离心力Q时，内侧外周壁面325a、325b、325c、325d所受到的支持力N并非与离心力Q在一直线上作用于各个滚珠324a、324b、324c、324d的。因此，产生离心力Q和支持力N的合力，该合力作用于滚珠324a、324b、324c、324d。该合力的作用方向为右旋方向(图28中顺时针方向)，因而各滚珠324a、324b、324c、324d产生移动力R。所以，第九实施例的盘片驱动装置，具有滚珠324a、324b、324c、324d容易相对于盘片301旋转中心在半径增大方向上移动的结构。However, as shown in FIG. 28 , when the centers of the arcs of the inner and outer peripheral wall surfaces 325a, 325b, 325c, and 325d of the hollow annular portion 320 are deviated from the rotation center of the disc 301, due to the rotation of the disc 301, the balls 324a, 324b , 324c, 324d when the centrifugal force Q is generated, the support force N received by the inner peripheral wall surface 325a, 325b, 325c, 325d is not acting on each ball 324a, 324b, 324c, 324d in a straight line with the centrifugal force Q. Therefore, a resultant force of the centrifugal force Q and the supporting force N is generated, and the resultant force acts on the balls 324a, 324b, 324c, and 324d. The resultant force acts in a right-handed direction (clockwise in FIG. 28 ), so each ball 324a, 324b, 324c, 324d generates a moving force R. Therefore, the disk drive device of the ninth embodiment has a structure in which the balls 324a, 324b, 324c, and 324d are easily moved relative to the rotation center of the disk 301 in the direction of increasing radius.

接下来，说明图28所示的在夹紧机构316上搭载具有内侧外周壁面325a、325b、325c、325d的平衡器223的第九实施例盘片驱动装置上装上具有质量失衡的盘片301并使之高速旋转的情形。Next, a ninth embodiment in which a balancer 223 having inner peripheral wall surfaces 325a, 325b, 325c, and 325d is mounted on a clamping mechanism 316 shown in FIG. Make it rotate at high speed.

图29(e)所示状态下，滚珠324a存在微小且右旋方向的移动力R的作用，位于上侧的滚珠324a移动至虚线所示的右侧位置。In the state shown in FIG. 29( e ), the ball 324a has a slight right-handed moving force R, and the upper ball 324a moves to the right position shown by the dotted line.

第九实施例中，内侧外周壁面325a、325b、325c、325d的圆弧中心偏离盘片301旋转中心的偏心距离为10～100μm左右。若该偏心距离过大的话，圆弧中心错开产生的移动力R超出盘片301质量失衡产生的振摆旋转振动所产生的移动力R，全部滚珠324a、324b、324c、324d会按右旋方向(顺时针方向)移动，便不能消除盘片301的质量失衡。In the ninth embodiment, the eccentricity distance between the arc center of the inner peripheral wall surfaces 325a, 325b, 325c, 325d and the rotation center of the disk 301 is about 10-100 μm. If the eccentric distance is too large, the moving force R generated by the misalignment of the center of the arc exceeds the moving force R generated by the pendulum rotation vibration caused by the mass imbalance of the disc 301, and all the balls 324a, 324b, 324c, and 324d will rotate in the right-hand direction. (clockwise) movement, the mass imbalance of the disc 301 cannot be eliminated.

图30是示意本发明第九实施例盘片驱动装置中另一平衡器223内部结构的平面剖面图。如图30所示，本发明第九实施例的盘片驱动装置中，各内侧外周壁面325a、325b、325c、325d中间隔330a、330b、330c、330d附近一部分分别设有平整部分337a、337b、337c、337d。这些平整部分337a、337b、337c、337d如图29(e)所示仅设置在滚珠324a容易留存的位置。这样，通过在间隔330a、330b、330c、330d附近内侧外周壁面325a、325b、325c、325d中一部分设有平整部分337a、337b、337c、337d，滚珠324a、324b、324c、324d可获得与内侧外周壁面325a、325b、325c、325d圆弧中心稍微偏离盘片301旋转中心情形相同的效果。不然的话，便因为平整部分337a、337b、337c、337d距盘片301旋转中心的距离越向右旋方向移动，距离越长，具有与外周壁面325a、325b、325c、325d的圆弧中心错开情形相同的构成。FIG. 30 is a plan sectional view showing the internal structure of another balancer 223 in the disk drive apparatus according to the ninth embodiment of the present invention. As shown in FIG. 30, in the disk drive device according to the ninth embodiment of the present invention, flattened portions 337a, 337b, 337b, 337c, 337d. These flat portions 337a, 337b, 337c, 337d are provided only at positions where the balls 324a are likely to remain as shown in FIG. 29(e). In this way, by providing flattened portions 337a, 337b, 337c, 337d on some of the inner peripheral wall surfaces 325a, 325b, 325c, 325d in the vicinity of the intervals 330a, 330b, 330c, 330d, the balls 324a, 324b, 324c, 324d can be aligned with the inner peripheral walls. The same effect is achieved when the arc centers of the wall surfaces 325a, 325b, 325c, and 325d deviate slightly from the rotation center of the disc 301 . Otherwise, because the distance between the flat parts 337a, 337b, 337c, and 337d and the rotation center of the disk 301 moves to the right-handed direction, the distance becomes longer, and the center of the arc of the outer peripheral wall surface 325a, 325b, 325c, and 325d is staggered. Same composition.

通过使图28所示内侧外周壁面的圆弧中心偏离构成平衡器，在图30所示间隔附近部分设置平整部分构成平衡器，用树脂成型品进行大批量生产时，对模具进行加工的精度管理容易，可实现加工时间、加工成本方面大幅度减小。The balancer is constructed by offsetting the arc center of the inner and outer peripheral wall surface shown in Fig. 28, and the balancer is formed by providing a flat part near the interval shown in Fig. 30. When mass-producing resin molded products, the accuracy management of the mold is processed. It is easy, and the processing time and processing cost can be greatly reduced.

本发明第九实施例的盘片驱动装置中，给出的是平衡部件即滚珠用磁性材料形成的例子，但即便用非磁性材料形成的滚珠也可以获得与第九实施例相同的效果。In the disc drive device according to the ninth embodiment of the present invention, an example is given in which the balls, which are the balance members, are made of magnetic material, but the same effects as those of the ninth embodiment can be obtained even if balls made of non-magnetic material are used.

而且，本发明第九实施例是就间隔数目为4个的情形进行说明的，但本发明不限于此，即便用2～8个左右的间隔分割中空环状部，也能获得与上述第九实施例相同的效果。Moreover, the ninth embodiment of the present invention has been described with respect to the case where the number of intervals is 4, but the present invention is not limited thereto. Even if the hollow annular portion is divided into about 2 to 8 intervals, the above-mentioned ninth embodiment can be obtained. Embodiment same effect.

本发明第九实施例的盘片驱动装置，说明的是夹紧机构316上设置平衡器223的例子，但平衡器设置成与盘片301旋转中心同轴、与盘片301可一体旋转的话，可以获得与第九实施例相同的效果。例如，也可以在装上盘片301的转台310上设置平衡器，或在主轴电动机302的转子部设置平衡器，或在底盘座306的主轴电动机302相对一侧设置平衡器，并将平衡器构成为可与主轴电动机转轴321一体旋转。The disk driving device of the ninth embodiment of the present invention is an example in which the balancer 223 is provided on the clamping mechanism 316. However, if the balancer is arranged to be coaxial with the rotation center of the disk 301 and can rotate integrally with the disk 301, The same effects as those of the ninth embodiment can be obtained. For example, a balancer may also be provided on the turntable 310 on which the disk 301 is loaded, or a balancer may be provided on the rotor portion of the spindle motor 302, or a balancer may be provided on the side opposite to the spindle motor 302 of the chassis base 306, and the balancer It is configured to be rotatable integrally with the spindle motor shaft 321 .

此外，第九实施例中说明的是圆弧状平衡室内侧外周壁面形状为真圆中部分圆弧的例子，但本发明不限于此，为椭圆中的部分圆弧也可以获得相同效果。In addition, in the ninth embodiment, an example in which the inner and outer peripheral wall of the arc-shaped balance chamber is a partial arc of a true circle is described, but the present invention is not limited thereto, and the same effect can be obtained by using a partial arc of an ellipse.

《第十实施例》"Tenth Embodiment"

接下来参照附图说明本发明第十实施例的盘片驱动装置。Next, a disk drive device according to a tenth embodiment of the present invention will be described with reference to the drawings.

图31和图32是示意本发明第十实施例盘片驱动装置中夹紧机构设有的平衡器224其内部结构的平面剖面图，分别示出平衡器224内滚珠的动作。另外，对于与上述第七实施例、第八实施例、第九实施例的盘片驱动装置组成具有实际相同功能的组成来说，标注相同标号，通过引用先前实施例的说明，省略重复说明。而且，第十实施例的平衡器224与上述图12所示的纵向剖面图中的平衡器221具有相同表示，故省略第十实施例的平衡器224的纵向剖面图。31 and 32 are planar cross-sectional views showing the internal structure of the balancer 224 provided in the clamping mechanism of the disc drive device according to the tenth embodiment of the present invention, respectively showing the movement of balls in the balancer 224. In addition, components having substantially the same functions as those of the disk drive apparatus of the seventh, eighth, and ninth embodiments are given the same reference numerals, and repeated descriptions are omitted by citing the descriptions of the previous embodiments. Moreover, the balancer 224 of the tenth embodiment has the same representation as the balancer 221 shown in the longitudinal sectional view of FIG. 12 , so the longitudinal sectional view of the balancer 224 of the tenth embodiment is omitted.

本发明第十实施例的盘片驱动装置，构成为对夹紧机构316设置的平衡器224中的中空环状部320进行分割的间隔可旋转自如保持。The disc drive device according to the tenth embodiment of the present invention is configured so that the space between the hollow annular portion 320 in the balancer 224 provided in the clamp mechanism 316 can be rotatably maintained.

第十实施例的盘片驱动装置中，间隔338a、338b、338c可设置为将中空环状部320一分为三。间隔338a、338b、338c与磁体318外周处旋转自如保持的环状间隔保持体339一体形成。因此，能够在各间隔338a、338b、338c仍保持120度间距的状态下在中空环状部320内旋转。而且，用间隔338a、338b、338c分隔的中空环状部320中各圆弧状平衡室323a、323b、323c内分别容纳磁性金属滚珠324a、324b、324c。In the disk drive device of the tenth embodiment, the intervals 338a, 338b, 338c may be configured to divide the hollow ring portion 320 into three. The spaces 338 a , 338 b , and 338 c are integrally formed with an annular spacer 339 rotatably held on the outer periphery of the magnet 318 . Therefore, it is possible to rotate within the hollow ring-shaped part 320 while the intervals 338a, 338b, 338c are kept at a distance of 120 degrees. Moreover, magnetic metal balls 324a, 324b, 324c are accommodated in the arc-shaped balance chambers 323a, 323b, 323c of the hollow annular portion 320 separated by the intervals 338a, 338b, 338c.

说明如上所述构成的第十实施例的盘片驱动装置以100Hz高速旋转具有质量失衡的盘片301时滚珠324a、324b、324c的移动状态。The movement state of the balls 324a, 324b, and 324c when the disk drive device of the tenth embodiment configured as above rotates the disk 301 having a mass imbalance at a high speed of 100 Hz will be described.

图31示出的是第十实施例盘片驱动装置装上质量失衡的盘片301加速旋转时夹紧机构316内滚珠324a、324b、324c其位置随时间的变化。图31所示的状态，为质量失衡盘片301其重心G位置位于中心突起317上侧磁体318区域的状态，此状态示出盘片301被夹住状态。图31中，随着盘片301转速增加，平衡器状态按空心箭头方向变化。FIG. 31 shows the change of the position of the balls 324a, 324b, 324c in the clamping mechanism 316 with time when the disk drive device of the tenth embodiment is loaded with an unbalanced disk 301 and rotates at an accelerated speed. The state shown in FIG. 31 is a state in which the center of gravity G of the mass-unbalanced disk 301 is located in the area of the magnet 318 on the upper side of the central protrusion 317. This state shows that the disk 301 is clamped. In FIG. 31 , as the rotation speed of the disk 301 increases, the state of the balancer changes in the direction of the hollow arrow.

图31(a)示出盘片301停转时的状态，滚珠324a、324b、324c由磁体318吸住。FIG. 31( a ) shows the state when the disk 301 is stopped, and the balls 324 a , 324 b , 324 c are attracted by the magnet 318 .

图31(b)示出盘片301加速初始状态，盘片301的转速较低，此时有[离心力]<[磁力]这一关系，因而滚珠324a、324b、324c仍处于被磁体318吸住状态。此时，盘片301右旋(图31(b)中顺时针方向旋转)，滚珠324因惯性通过与盘片301旋转相反的左旋(图31(b)中逆时针方向旋转)沿间隔保持体339外周面移动。Figure 31(b) shows the initial state of the acceleration of the disc 301, the rotational speed of the disc 301 is relatively low, at this time there is a relationship of [centrifugal force]<[magnetic force], so the balls 324a, 324b, 324c are still attracted by the magnet 318 state. At this time, the disc 301 rotates right (clockwise in FIG. 31( b )), and the ball 324 rotates counterclockwise (rotating counterclockwise in FIG. 31( b )) along the spacer due to inertia. 339 the outer peripheral surface moves.

图31(c)示出盘片301加速中期状态，盘片301转速较高，此时有[离心力]>[磁力]这一关系，滚珠324a、324b、324c脱离磁体318的磁力，到达中空环状部320的内侧外周壁面325。Fig. 31(c) shows the mid-acceleration state of the disk 301, and the rotation speed of the disk 301 is high. At this time, there is a relationship of [centrifugal force]>[magnetic force]. The balls 324a, 324b, and 324c break away from the magnetic force of the magnet 318 and reach the hollow ring The inner peripheral wall surface 325 of the shaped portion 320 .

图31(c)所示状态下，盘片301的振摆旋转振动其振幅增大，在此影响下，底盘座306的振摆旋转振动其振幅也增大。此时，底盘座306的振摆旋转振动其记录轨跟随方向(磁头移动方向)和晃动方向(与记录轨跟随方向相正交方向)的振动相位差为90度，因而滚珠324a、324b、324c的离心力合力集中于与盘片301重心G错开90度的方向(图31(c)的左侧)上，滚珠324a、324b、324c分别移动至该方向。In the state shown in FIG. 31(c), the amplitude of the wobbling and rotating vibration of the disk 301 increases, and under this influence, the amplitude of the wobbling and rotating vibration of the chassis base 306 also increases. At this time, the vibration phase difference of the pendulum rotation vibration of the chassis base 306 in its recording track following direction (head moving direction) and shaking direction (direction orthogonal to the recording track following direction) is 90 degrees, so the balls 324a, 324b, 324c The resultant centrifugal force of the disc 301 concentrates on the direction (the left side in FIG. 31( c )) staggered by 90 degrees from the center of gravity G of the disc 301, and the balls 324a, 324b, and 324c respectively move to this direction.

图31(d)示出盘片301加速末期状态，底盘座306的振摆旋转振动其记录轨跟随方向和晃动方向的振动相位差接近180度，因而左侧滚珠沿左旋方向压紧间隔38的移动力R变大。因此，滚珠324a、324b、324c的离心力合力集中于与盘片301重心G错开大约180的方向(下侧)，滚珠324a、324b、324c和间隔338a、338b、338c旋转移动。但图31(d)所示状态，滚珠324a、324b、324c的离心力合力还稍稍朝向左下方向，盘片301质量失衡的离心力和滚珠324a、324b、324c的离心力尚未抵消，还存在各自离心力的合力。Figure 31(d) shows the final state of the acceleration of the disk 301, the vibration phase difference between the recording track following direction and the shaking direction of the vibrating and rotating vibration of the chassis base 306 is close to 180 degrees, so the left ball presses the gap 38 in the left-hand direction The movement force R becomes larger. Therefore, the resultant centrifugal force of the balls 324a, 324b, 324c is concentrated in a direction (lower side) that deviates from the center of gravity G of the disc 301 by about 180°, and the balls 324a, 324b, 324c and the spaces 338a, 338b, 338c rotate and move. However, in the state shown in Fig. 31(d), the resultant centrifugal force of the balls 324a, 324b, 324c is still slightly towards the lower left direction, the centrifugal force caused by the unbalanced mass of the disk 301 and the centrifugal force of the balls 324a, 324b, 324c have not yet offset, and there is still a resultant force of their respective centrifugal forces .

图31(e)示出盘片301加速结束状态，盘片301的转速达到最高速度100Hz。此时，3个滚珠324a、324b、324c集结到相对于质量失衡盘片301重心G位置错开180度的位置，可充分消除盘片301的质量失衡。因而，可抑制实施例4盘片驱动装置中底盘座306的振摆旋转振动。Fig. 31(e) shows the state where the acceleration of the disk 301 is completed, and the rotational speed of the disk 301 reaches the maximum speed of 100 Hz. At this time, the three balls 324 a , 324 b , 324 c are assembled at a position staggered by 180 degrees relative to the center of gravity G of the mass-unbalanced disk 301 , which can fully eliminate the mass imbalance of the disk 301 . Therefore, the whirling rotational vibration of the chassis base 306 in the disk drive apparatus of Embodiment 4 can be suppressed.

第十实施例的盘片驱动装置如上所述，按120度均匀间距设置各间隔338a、338b、338c，并且可旋转地保持间隔338a、338b、338c，因而上述实施例3中用图29说明的问题，具体来说，由于间隔固定使滚珠留在使盘片301质量失衡增加的位置上这种问题，不会在第十实施例中发生。As mentioned above, the disk drive device of the tenth embodiment sets the intervals 338a, 338b, 338c at uniform intervals of 120 degrees, and maintains the intervals 338a, 338b, 338c rotatably. The problem, specifically, that the balls remain in positions where the mass imbalance of the disc 301 increases due to the fixed spacing, does not occur in the tenth embodiment.

接下来，用图32说明第十实施例盘片驱动装置将无质量失衡的盘片301装上盘片驱动装置以100Hz高速旋转盘片301时滚珠的移动状态。Next, the moving state of the balls when the disc drive device of the tenth embodiment loads the disc 301 without mass imbalance on the disc drive device and rotates the disc 301 at a high speed of 100 Hz will be described with reference to FIG. 32 .

图32中，随着盘片301转速增加，平衡器状态按空心箭头方向变化。图32中，盘片301没有质量失衡，因而省略重心G表示。而且，盘片301不存在质量失衡，因而不需要考虑盘片301重心和间隔之间的位置关系。In FIG. 32 , as the rotation speed of the disk 301 increases, the state of the balancer changes in the direction of the hollow arrow. In FIG. 32, the disc 301 has no mass imbalance, so the center of gravity G is omitted. Moreover, there is no mass imbalance in the disk 301, so there is no need to consider the positional relationship between the center of gravity of the disk 301 and the interval.

图32(a)示出盘片301停转时的状态，滚珠324a、324b、324c由磁体318吸住。FIG. 32( a ) shows the state when the disk 301 is stopped, and the balls 324 a , 324 b , 324 c are attracted by the magnet 318 .

图32(b)示出盘片301加速初始状态。此时，盘片301转速较低，这时有[离心力]<[磁力]这一关系，因而滚珠324a、324b、324c仍处于通过间隔保持体被磁体318的磁力吸住的状态。此时，盘片301右旋，滚珠324因惯性按与盘片301旋转方向相反的左旋方向旋转，沿间隔保持体339外周面移动。Fig. 32(b) shows the initial state of acceleration of the disk 301. At this time, the rotation speed of the disc 301 is low, and there is a relationship of [centrifugal force]<[magnetic force] at this time, so the balls 324a, 324b, 324c are still in the state of being attracted by the magnetic force of the magnet 318 through the spacer. At this time, the disk 301 rotates right, and the ball 324 rotates in the counterclockwise direction opposite to the rotation direction of the disk 301 due to inertia, and moves along the outer peripheral surface of the spacer 339 .

图32(c)示出盘片301加速中期状态，盘片301转速较高，此时有[离心力]>[磁力]这一关系，因而滚珠324a、324b、324c脱离磁体318的磁力，到达中空环状部320的内侧外周壁面325。此时，滚珠324a、324b、324c依然按与盘片301旋转方向相反方向(左旋)移动。Figure 32(c) shows the mid-acceleration state of the disk 301. The rotation speed of the disk 301 is relatively high. At this time, there is a relationship of [centrifugal force]>[magnetic force]. Therefore, the balls 324a, 324b, and 324c break away from the magnetic force of the magnet 318 and reach the hollow space. The inner peripheral wall surface 325 of the annular portion 320 . At this time, the balls 324a, 324b, 324c still move in the opposite direction (clockwise) to the rotation direction of the disc 301 .

图32(d)示出盘片301加速末期状态，滚珠324a、324b、324c与间隔338a、338b、338c相接触。但间隔338a、338b、338c可旋转自如地保持，因而滚珠324a、324b、324c和间隔338a、338b、338c由于滚珠324a、324b、324c的惯性力一体地按左旋方向(逆时针方向)旋转。Fig. 32(d) shows the state at the end of the acceleration of the disk 301, where the balls 324a, 324b, 324c are in contact with the spaces 338a, 338b, 338c. However, the spaces 338a, 338b, and 338c are rotatably maintained, so the balls 324a, 324b, 324c and the spaces 338a, 338b, 338c are integrally rotated in the left-handed direction (counterclockwise) due to the inertial force of the balls 324a, 324b, 324c.

图32(e)示出盘片301加速结束状态。在此状态下，盘片301的转速达到最高速度100Hz。此时，滚珠324a、324b、324c的惯性力减小，滚珠324a、324b、324c和间隔338a、338b、338c的旋转在接触状态下停止。Fig. 32(e) shows the state where the acceleration of the disk 301 is completed. In this state, the rotational speed of the disk 301 reaches a maximum speed of 100 Hz. At this time, the inertial force of the balls 324a, 324b, 324c decreases, and the rotation of the balls 324a, 324b, 324c and the spaces 338a, 338b, 338c stops in a contact state.

这样，第十实施例的盘片驱动装置中，每隔120度均匀间距设有间隔338a、338b、338c，滚珠324a、324b、324c稳定地处于与间隔338a、338b、338c相接触位置的话，滚珠324a、324b、324c的配置造成的失衡便完全没有发生。In this way, in the disk drive device of the tenth embodiment, intervals 338a, 338b, and 338c are provided at uniform intervals of 120 degrees. The imbalance caused by the configuration of 324a, 324b, 324c does not occur at all.

而且，上述第八实施例中说明的问题，具体来说，由于间隔固定，因而在纵向放置盘片驱动装置并低速旋转盘片301时，随着间隔和滚珠的碰撞而产生噪声这种问题，因第十实施例中间隔可旋转自如地保持这种结构而得到解决。例如，即便滚珠与间隔碰撞，第十实施例中也可通过间隔的旋转来吸收滚珠碰撞时的冲击，因而没有滚珠和间隔间碰撞产生的噪声。Furthermore, the problems described in the above-mentioned eighth embodiment, specifically, since the interval is fixed, when the disk drive device is placed vertically and the disk 301 is rotated at a low speed, noise is generated due to collision between the interval and the balls, The problem is solved because the spacer in the tenth embodiment can rotatably maintain this structure. For example, even if the ball collides with the spacer, in the tenth embodiment, the spacer can rotate to absorb the impact when the ball collides, so there is no noise generated by the collision between the ball and the spacer.

本发明第十实施例的盘片驱动装置，用磁性材料所形成的滚珠进行说明，第十实施例中滚珠和间隔碰撞时没有噪声产生，因而不需要靠磁力吸住滚珠。因而，利用非磁性材料形成的滚珠来构成，也可获得与上述第十实施例相同的效果。The disk driving device of the tenth embodiment of the present invention is described by using the balls formed of magnetic materials. In the tenth embodiment, no noise is generated when the balls collide with the spacer, and thus the balls do not need to be attracted by magnetic force. Therefore, the same effect as that of the tenth embodiment described above can also be obtained by using balls formed of non-magnetic materials.

本发明第十实施例的盘片驱动装置中，对中空环状部320进行分割的间隔数目，说明的是按均匀间距每隔中心角120度设置共计设有3个的情形。但如图33至图37中平衡器平面剖面图所示，对中空环状部320进行分割的间隔个数不限于3个，由2、3、4、6、8个等间隔分割中空环状部320也可获得与上述第十实施例相同的效果。图33至图37中，与上述组成相同功能的部件标注相同标号，并且对多个组成依次在标号后标注小写字母(a，b，c，…)。尽管未图示并省略，但间隔数目为5个或7个，当然也能得到相同的效果。In the disk drive device according to the tenth embodiment of the present invention, the number of intervals for dividing the hollow annular portion 320 is described as a situation where a total of three are provided at intervals of 120 degrees at a central angle. But as shown in the plane sectional view of the balancer in Fig. 33 to Fig. 37, the number of intervals for dividing the hollow annular part 320 is not limited to 3, and the hollow annular part is divided into 2, 3, 4, 6, and 8 equal intervals. The portion 320 can also obtain the same effects as those of the tenth embodiment described above. In Fig. 33 to Fig. 37, components with the same function as the above-mentioned components are marked with the same reference numerals, and lowercase letters (a, b, c, . . . ) are marked after the multiple components in sequence. Although not shown and omitted, the same effect can of course be obtained even if the number of intervals is five or seven.

本发明第十实施例的盘片驱动装置，说明的是在夹紧机构316中设置平衡器221的例子，但对于其他结构，若与盘片301旋转中心同轴、并且可与盘片301一体旋转设置中空环状部的话，也可以获得与上述第十实施例相同的效果。例如，也可以在装上盘片301的转台310上设置平衡器，或在主轴电动机302的转子部设置平衡器，或在底盘座306的主轴电动机302相对一侧设置平衡器，并将平衡器构成为可与主轴电动机转轴321一体旋转。The disk driving device of the tenth embodiment of the present invention is an example in which the balancer 221 is provided in the clamping mechanism 316, but for other structures, if it is coaxial with the rotation center of the disk 301 and can be integrated with the disk 301 Even if the hollow annular portion is rotated, the same effect as that of the tenth embodiment described above can be obtained. For example, a balancer may also be provided on the turntable 310 on which the disk 301 is loaded, or a balancer may be provided on the rotor portion of the spindle motor 302, or a balancer may be provided on the side opposite to the spindle motor 302 of the chassis base 306, and the balancer It is configured to be rotatable integrally with the spindle motor shaft 321 .

《第十一实施例》"Eleventh Embodiment"

接下来参照附图说明本发明第十一实施例的盘片驱动装置。图38和图39是示意本发明第十一实施例盘片驱动装置中夹紧机构设有的平衡器225其内部结构的平面剖面图。另外，图38和图39当中对于与上述第七实施例、第八实施例、第九实施例和第十实施例的盘片驱动装置组成具有实际相同功能的组成来说，标注相同标号，通过引用先前实施例的说明，省略重复说明。而且，第十一实施例的平衡器225与上述图12所示的纵向剖面图中的平衡器221具有相同表示，故省略第十一实施例的平衡器225的纵向剖面图。Next, a disk drive device according to an eleventh embodiment of the present invention will be described with reference to the drawings. 38 and 39 are plan sectional views showing the internal structure of the balancer 225 provided in the clamping mechanism of the disk drive device according to the eleventh embodiment of the present invention. In addition, in Fig. 38 and Fig. 39, the components having substantially the same functions as those of the above-mentioned seventh embodiment, the eighth embodiment, the ninth embodiment and the tenth embodiment are denoted by the same reference numerals. The descriptions of the previous embodiments are cited, and repeated descriptions are omitted. Moreover, the balancer 225 of the eleventh embodiment has the same representation as the balancer 221 shown in the longitudinal sectional view of FIG. 12 , so the longitudinal sectional view of the balancer 225 of the eleventh embodiment is omitted.

本发明第十一实施例的盘片驱动装置，构成为平衡器225中对中空环状部320进行分割的间隔具有固定型和旋转型这2种但加以混合。固定型间隔340a、340b固定于平衡器225中对中空环状部320一分为二，而旋转型间隔338a、338b可旋转地保持在磁体318的外周。设置成将中空环状部320一分为二的旋转型间隔338a、338b，与可旋转地保持在磁体318外周的环状间隔保持体339一体构成。In the disk drive device according to the eleventh embodiment of the present invention, the space for dividing the hollow annular portion 320 in the balancer 225 is composed of two types, namely, a fixed type and a rotary type, but they are mixed. The fixed spacers 340 a , 340 b are fixed in the balancer 225 bisecting the hollow ring portion 320 , while the rotary spacers 338 a , 338 b are rotatably held on the outer periphery of the magnet 318 . Rotary spacers 338 a and 338 b provided to divide the hollow annular portion 320 into two are integrally formed with an annular spacer 339 rotatably held on the outer periphery of the magnet 318 .

4个间隔338a、338b、340a、340b所分割的圆弧状平衡室323a、323b、323c、323d分别容纳一个用磁性材料形成的滚珠324a、324b、324c、324d。因此，滚珠324a、324b、324c、324d收容在旋转型间隔338a、338b和固定型间隔340a、340b所围成的圆弧状平衡室323a、323b、323c、323d内，因而滚珠324a、324b、324c、324d可移动的平衡室323a、323b、323c、323d其大小是可变的。The arc-shaped balance chambers 323a, 323b, 323c, 323d divided by the four intervals 338a, 338b, 340a, 340b respectively accommodate a ball 324a, 324b, 324c, 324d formed of magnetic material. Therefore, the balls 324a, 324b, 324c, 324d are accommodated in the circular arc-shaped balance chambers 323a, 323b, 323c, 323d surrounded by the rotating type intervals 338a, 338b and the fixed type intervals 340a, 340b, so that the balls 324a, 324b, 324c , 324d The movable balance chambers 323a, 323b, 323c, 323d are variable in size.

接着，用图38说明第十一实施例盘片驱动装置旋转驱动质量失衡盘片301时滚珠的移动状态。Next, the moving state of the balls when the disk drive device of the eleventh embodiment rotates and drives the mass-unbalanced disk 301 will be described with reference to FIG. 38 .

现说明如上所述构成的本发明第十一实施例盘片驱动装置将质量失衡盘片置放在盘片驱动装置上以100Hz高速旋转盘片301的情形。图38中，随着盘片转速的增加，平衡器状态按空心箭头方向变化。Now, the eleventh embodiment of the disk drive device of the present invention constructed as above will describe the situation in which a mass-unbalanced disk is placed on the disk drive device and the disk 301 is rotated at a high speed of 100 Hz. In Fig. 38, as the rotation speed of the disk increases, the state of the balancer changes in the direction of the hollow arrow.

图38(a)示出盘片301停转时的状态，滚珠324a、324b、324c、324d被磁体318吸住。FIG. 38( a ) shows the state when the disk 301 is stopped, and the balls 324 a , 324 b , 324 c , and 324 d are attracted by the magnet 318 .

图38(b)示出盘片301加速初始状态，盘片301的转速较低，此时有[离心力]<[磁力]这一关系，因而滚珠324a、324b、324c、324d仍处于由磁体318的磁力通过间隔保持体329吸住的状态。此时，盘片301右旋(顺时针方向)，滚珠324a、324b、324c、324d因惯性力按与盘片301旋转方向相反的左旋(逆时针方向)方式沿间隔保持体339外周面移动。Figure 38(b) shows the initial state of the acceleration of the disc 301. The rotating speed of the disc 301 is relatively low. At this time, there is a relationship of [centrifugal force]<[magnetic force]. The magnetic force is held by the spacer 329. At this time, the disc 301 rotates right-handed (clockwise), and the balls 324a, 324b, 324c, 324d move along the outer peripheral surface of the spacer 339 in a left-handed (counterclockwise) manner opposite to the rotational direction of the disc 301 due to inertial force.

图38(c)示出盘片301加速中期状态。盘片301转速较高，此时有[离心力]>[磁力]这一关系，滚珠324a、324b、324c、324d脱离磁体318的磁力，到达中空环状部320的内侧外周壁面325。此时，盘片301的振摆旋转振动其振幅增大，在其影响下，底盘座306的振摆旋转振动其振幅也增大。此时，底盘座306的振摆旋转振动其记录轨跟随方向(磁头移动方向)和晃动方向(与记录轨跟随方向相正交方向)的振动相位差为90度，因而滚珠324a、324b、324c、324d的离心力合力集中于与盘片301重心G错开90度的方向(图38(c)的左侧)上，滚珠324a、324b、324c、324d向该方向移动。Fig. 38(c) shows a state in which the disk 301 is accelerated. The rotation speed of the disc 301 is relatively high. At this time, there is a relationship of [centrifugal force]>[magnetic force]. The balls 324a, 324b, 324c, and 324d break away from the magnetic force of the magnet 318 and reach the inner peripheral wall surface 325 of the hollow annular portion 320. At this time, the amplitude of the wobbling and rotating vibration of the disk 301 increases, and under the influence of this, the amplitude of the wobbling and rotating vibration of the chassis base 306 also increases. At this time, the vibration phase difference of the pendulum rotation vibration of the chassis base 306 in its recording track following direction (head moving direction) and shaking direction (direction orthogonal to the recording track following direction) is 90 degrees, so the balls 324a, 324b, 324c The resultant centrifugal force of 324d concentrates on the direction (the left side of FIG. 38(c)) staggered 90 degrees from the center of gravity G of the disc 301, and the balls 324a, 324b, 324c, 324d move in this direction.

图38(d)示出盘片301加速末期状态。此时，底盘座306的振摆旋转振动其记录轨跟随方向和晃动方向的振动相位差接近180度，因而滚珠324a、324b、324c、324d移动，使得滚珠324a、324b、324c、324d的离心力合力集中于与盘片301重心G错开约180度的方向上(下侧)。但图38(d)所示状态，滚珠324a、324b、324c、324d的离心力合力还稍稍朝向左下方向，盘片301质量失衡的离心力和滚珠324的离心力在相反方向上互相有偏移，还存在上述离心力的合力。Fig. 38(d) shows the state at the end of the acceleration of the disk 301. At this time, the vibration phase difference between the recording rail following direction and the shaking direction of the vibrating and rotating vibration of the chassis base 306 is close to 180 degrees, so the balls 324a, 324b, 324c, 324d move, and the centrifugal force of the balls 324a, 324b, 324c, 324d is combined. Concentrate on the direction (lower side) shifted by about 180 degrees from the center of gravity G of the disk 301 . However, in the state shown in Figure 38(d), the resultant centrifugal force of the balls 324a, 324b, 324c, and 324d is still slightly towards the lower left direction, and the centrifugal force caused by the mass imbalance of the disk 301 and the centrifugal force of the ball 324 are offset from each other in opposite directions. The resultant of the above centrifugal forces.

图38(e)示出盘片301加速结束的状态，此时盘片301的旋转频率达到最高速度100Hz。图38(e)中，左侧滚珠324d沿左旋方向(逆时针方向)旋转压紧间隔338b的移动力R变大，因而滚珠324d压紧着使另3个滚珠324a、324b、324c和间隔按左旋方向旋转。因此，滚珠324a、324b、324c、324d的离心力合力处于与盘片301质量失衡大致错开180度的状态，可充分消除盘片301的质量失衡。因而，可抑制第十一实施例盘片驱动装置中底盘座306的振摆旋转振动。Fig. 38(e) shows the state where the acceleration of the disk 301 is completed, and at this time the rotation frequency of the disk 301 reaches the maximum speed of 100 Hz. In Fig. 38(e), the moving force R of the left ball 324d rotating in the left-hand direction (counterclockwise) to compress the space 338b becomes larger, so that the ball 324d is pressed tightly so that the other three balls 324a, 324b, 324c and the space are pressed Rotate in left direction. Therefore, the resultant centrifugal force of the balls 324 a , 324 b , 324 c , and 324 d is approximately 180 degrees away from the mass imbalance of the disk 301 , which can fully eliminate the mass imbalance of the disk 301 . Thus, the whirling rotational vibration of the chassis base 306 in the disk drive apparatus of the eleventh embodiment can be suppressed.

这样，中空环状部320就可由旋转的间隔338a、338b和固定的间隔340a、340b按大小可变的多个圆弧状平衡室323a、323b、323c、323d划分，因而与上述第七实施例那样仅有固定间隔的情形或上述第十实施例那样仅有旋转间隔的情形相比，第十一实施例滚珠324a、324b、324c、324d其可移动范围大幅度扩大。因此，第十一实施例中滚珠324a、324b、324c、324d容易集中到相对于盘片质量失衡重心G的180度相对一侧。因此，第十一实施例的盘片驱动装置中，能够将滚珠324a、324b、324c、324d的重量、个数以及中空环状部直径设定得相对较小。In this way, the hollow annular portion 320 can be divided by a plurality of circular arc-shaped balance chambers 323a, 323b, 323c, 323d with variable sizes by the rotating intervals 338a, 338b and the fixed intervals 340a, 340b, thus it is different from the above-mentioned seventh embodiment. Compared with the case where there are only fixed intervals like that or the case where there are only rotational intervals as in the above-mentioned tenth embodiment, the movable range of the balls 324a, 324b, 324c, and 324d in the eleventh embodiment is greatly expanded. Therefore, in the eleventh embodiment, the balls 324a, 324b, 324c, 324d are easy to concentrate on the 180-degree opposite side with respect to the disc mass imbalance center G. Therefore, in the disk drive device of the eleventh embodiment, the weight, number, and diameter of the hollow annular portion of the balls 324a, 324b, 324c, and 324d can be set relatively small.

接下来，用图39说明第十一实施例盘片驱动装置将无质量失衡的均匀盘片301装上以100Hz旋转频率高速旋转盘片301时滚珠324a、324b、324c、324d的移动状态。图39中，随着盘片301转速增加，平衡器状态按空心箭头方向变化。图39中，盘片301没有质量失衡，因而省略重心G的表示。Next, the moving state of the balls 324a, 324b, 324c, 324d when the disk drive device of the eleventh embodiment is mounted on a uniform disk 301 with no mass imbalance and rotates at a high speed of 100 Hz is described with reference to FIG. 39 . In FIG. 39 , as the rotation speed of the disk 301 increases, the state of the balancer changes in the direction of the hollow arrow. In FIG. 39, since the disc 301 has no mass imbalance, the illustration of the center of gravity G is omitted.

图39(a)示出盘片301停转时的状态，滚珠324a、324b、324c、324d由磁体318吸住。FIG. 39( a ) shows the state when the disk 301 is stopped, and the balls 324 a , 324 b , 324 c , 324 d are attracted by the magnet 318 .

图39(b)示出盘片301加速初始状态。此时，盘片301转速较低，有[离心力]<[磁力]这一关系，因而滚珠324a、324b、324c、324d仍处于靠磁体318的磁力夹着间隔保持体339被吸住的状态。图39(b)所示状态，盘片301按右旋方向(顺时针方向)旋转，滚珠324a、324b、324c、324d因惯性力按与盘片301旋转方向相反的左旋方向(逆时针方向)旋转沿间隔保持体339外周面移动。Fig. 39(b) shows the initial state of acceleration of the disk 301. At this time, the rotation speed of the disc 301 is relatively low, and there is a relationship of [centrifugal force]<[magnetic force]. Therefore, the balls 324a, 324b, 324c, and 324d are still in the state of being attracted by the magnetic force of the magnet 318 sandwiching the spacer 339. In the state shown in Fig. 39(b), the disk 301 rotates in the right-handed direction (clockwise), and the balls 324a, 324b, 324c, 324d rotate in the left-handed direction (counterclockwise) opposite to the rotation direction of the disk 301 due to inertial force. The rotation moves along the outer peripheral surface of the spacer 339 .

图39(c)示出盘片301加速中期状态。此时，盘片301转速较高，有[离心力]>[磁力]这一关系，因而滚珠324a、324b、324c、324d脱离磁体318的磁力，到达中空环状部320的内侧外周壁面325。此时，滚珠324a、324b、324c、324d依然按与盘片301旋转方向相反方向(逆时针方向)移动。Fig. 39(c) shows a state in which the disk 301 is accelerated. At this time, the rotation speed of the disk 301 is relatively high, and there is a relationship of [centrifugal force]>[magnetic force]. Therefore, the balls 324a, 324b, 324c, and 324d break away from the magnetic force of the magnet 318 and reach the inner peripheral wall surface 325 of the hollow annular portion 320. At this time, the balls 324a, 324b, 324c, and 324d still move in the opposite direction (counterclockwise) to the rotation direction of the disc 301 .

图39(d)示出盘片301加速末期状态，滚珠324a、324b、324c、324d与间隔338a、338b、340a、340b相接触。但2个间隔338a、338b可旋转自如地由磁体318保持，因而滚珠324b、324d和间隔338a、338b由于滚珠324b、324d的惯性力一体左旋(逆时针方向旋转)。另外，与固定的间隔340a、340b接触的滚珠324a、324c则停留于其位置。Fig. 39(d) shows the state at the end of the acceleration of the disk 301, where the balls 324a, 324b, 324c, 324d are in contact with the spaces 338a, 338b, 340a, 340b. However, the two spaces 338a, 338b are rotatably held by the magnet 318, so the balls 324b, 324d and the spaces 338a, 338b rotate counterclockwise (counterclockwise) integrally due to the inertial force of the balls 324b, 324d. In addition, the balls 324a, 324c in contact with the fixed spaces 340a, 340b stay in their positions.

图39(e)示出盘片301加速结束状态，盘片301的转速达到最高速度100Hz。到此时为止，滚珠324b、324d压紧在2个旋转型间隔338a、338b上，而与2个固定型间隔340a、340b碰接的滚珠324a、324c通过碰接停留。然后，滚珠324b、324d的惯性力减小，滚珠324a、324b、324c、324d和间隔338a、338b、340a、340b的旋转在接触状态下停止。Fig. 39(e) shows the state where the acceleration of the disk 301 is completed, and the rotational speed of the disk 301 reaches the maximum speed of 100 Hz. Up to this point, the balls 324b, 324d are pressed against the two rotary-type spaces 338a, 338b, and the balls 324a, 324c abutting the two fixed-type spaces 340a, 340b stay by the contact. Then, the inertial force of the balls 324b, 324d decreases, and the rotation of the balls 324a, 324b, 324c, 324d and the spaces 338a, 338b, 340a, 340b stops in a contact state.

这样，旋转型间隔338a、338b和固定型间隔340a、340b分别处于相距180的位置关系，因而滚珠324a、324b、324c、324d稳定地处于与间隔338a、338b、340a、340b相接触位置的话，滚珠324a、324b、324c、324d重量造成的失衡便完全不会发生。In this way, the rotation-type intervals 338a, 338b and the fixed-type intervals 340a, 340b are in a positional relationship of 180° apart, so if the balls 324a, 324b, 324c, 324d are stably in contact with the intervals 338a, 338b, 340a, 340b, the balls will The imbalance caused by the weight of 324a, 324b, 324c, 324d will not occur at all.

本发明第十一实施例的盘片驱动装置中，说明的是靠2个旋转型间隔、2个固定型间隔共计4个间隔分割中空环状部的情形，本发明对中空环状部进行分割的间隔个数不限于4个，用4～8个左右间隔分割也可获得相同的效果。但为了在无质量失衡的均匀盘片的场合确保滚珠配置的均匀性，旋转型间隔和固定型间隔的个数最好相同。In the disk drive device of the eleventh embodiment of the present invention, the description is that the hollow annular portion is divided into four intervals in total by two rotary intervals and two fixed intervals. The present invention divides the hollow annular portion The number of intervals is not limited to 4, and the same effect can also be obtained by dividing by about 4 to 8 intervals. However, in order to ensure the uniformity of ball arrangement in the case of a uniform disk without mass imbalance, it is preferable to have the same number of rotating type spacers and fixed type spacers.

本发明第十一实施例的盘片驱动装置，给出的是在夹紧机构中设置平衡器的例子，本发明的平衡器，若与盘片旋转中心同轴、并且可与盘片一体旋转设置的话，也可以获得与上述第十一实施例相同的效果。例如，也可以在装上盘片的转台上设置平衡器，或在主轴电动机的转子部设置平衡器，或在底盘座的主轴电动机相对一侧设置平衡器，并将平衡器构成为可与主轴电动机转轴一体旋转。The disk driving device of the eleventh embodiment of the present invention provides an example of installing a balancer in the clamping mechanism. If the balancer of the present invention is coaxial with the rotation center of the disk and can rotate integrally with the disk, If set, the same effects as those of the above eleventh embodiment can also be obtained. For example, it is also possible to install a balancer on the turntable on which the disk is loaded, or to install a balancer on the rotor portion of the spindle motor, or to arrange a balancer on the opposite side of the chassis base to the spindle motor, and to make the balancer so that it can be connected to the spindle. The rotating shaft of the motor rotates integrally.

上述第十一实施例中也可如上述实施例2所示进行实施，在间隔上装弹性体，或者用弹性体形成间隔本身，通过这种实施，可以改善盘片低速旋转时容易发生的间隔和滚珠的碰撞所造成的噪声。The above-mentioned eleventh embodiment can also be implemented as shown in the above-mentioned embodiment 2, by installing elastic bodies on the spacers, or using elastic bodies to form the spacers themselves. Through this implementation, the space and space that are likely to occur when the disk rotates at a low speed can be improved. The noise caused by the collision of balls.

而且，本发明第十一实施例的盘片驱动装置，说明的是所用滚珠具有磁性的情形，但滚珠的材质即便用非磁性材料，也可获得与利用磁性滚珠时相同的效果。Moreover, the disk drive device of the eleventh embodiment of the present invention illustrates the use of magnetic balls, but the same effect as when using magnetic balls can be obtained even if the balls are made of non-magnetic materials.

《第十二实施例》"The Twelfth Embodiment"

接下来参照附图说明本发明第十二实施例的盘片驱动装置。图40是示意本发明第十一实施例盘片驱动装置中夹紧机构设有的平衡器226其内部结构的平面剖面图。另外，图40当中对于与上述第七实施例、第八实施例、第九实施例、第十实施例和第十一实施例说明的盘片驱动装置组成具有实际相同功能的组成来说，标注相同标号，通过引用先前实施例的说明，省略重复说明。而且，第十二实施例的平衡器226与上述图12所示的纵向剖面图中的平衡器221具有相同表示，故省略第十二实施例的平衡器226的纵向剖面图。Next, a disk drive device according to a twelfth embodiment of the present invention will be described with reference to the drawings. FIG. 40 is a plan sectional view showing the internal structure of the balancer 226 provided in the clamping mechanism of the disc drive device in the eleventh embodiment of the present invention. In addition, in FIG. 40 , for components that have substantially the same functions as those of the disc drive described in the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, and the eleventh embodiment, mark The same reference numerals refer to the descriptions of previous embodiments, and repeated descriptions are omitted. Moreover, the balancer 226 of the twelfth embodiment has the same representation as the balancer 221 shown in the longitudinal sectional view of FIG. 12, so the longitudinal sectional view of the balancer 226 of the twelfth embodiment is omitted.

本发明第十二实施例盘片驱动装置中平衡器226设于夹紧机构316上，用4个间隔330a、330b、330c、330d分割中空环状部320，具有圆弧状平衡室323a、323b、323c、323d。平衡室226的中央设有磁体318，磁体318的磁极(图40中磁极用N、S表示)配置成相对于间隔330a、330b、330c、330d为规定相位关系。若详细说明上述规定位置关系，磁体318的磁极可构成为配置在各间隔330a、330b、330c、330d的附近，在盘片301停止旋转或低速旋转时，保证磁性体的滚珠324a、324b、324c、324d吸到磁体318磁极位置的状态。In the disk drive device of the twelfth embodiment of the present invention, the balancer 226 is arranged on the clamping mechanism 316, and the hollow annular part 320 is divided by four intervals 330a, 330b, 330c, 330d, and has arc-shaped balance chambers 323a, 323b , 323c, 323d. A magnet 318 is provided in the center of the balance chamber 226, and the magnetic poles of the magnet 318 (indicated by N and S in FIG. 40) are arranged in a predetermined phase relationship with respect to the intervals 330a, 330b, 330c, and 330d. If the above-mentioned predetermined positional relationship is described in detail, the magnetic poles of the magnet 318 can be configured to be arranged in the vicinity of the respective intervals 330a, 330b, 330c, and 330d. , 324d are attracted to the state of the magnetic pole position of the magnet 318.

图40示出第十二实施例盘片驱动装置中盘片301停止旋转或低速旋转场合间隔330a、330b、330c、330d和磁性体滚珠324a、324b、324c、324d和磁体318之间位置关系。如图40所示，中空环状部320各内侧外周壁325a、325b、325c、325d与磁体318磁极(N极、S极)位置相对的位置上，埋设有弹性体341a、341b、341c、341d。40 shows the positional relationship between the spacers 330a, 330b, 330c, 330d and the magnetic balls 324a, 324b, 324c, 324d and the magnet 318 when the disk 301 stops rotating or rotates at a low speed in the disk drive device of the twelfth embodiment. As shown in FIG. 40, elastic bodies 341a, 341b, 341c, 341d are embedded in the positions where the inner peripheral walls 325a, 325b, 325c, 325d of the hollow annular portion 320 are opposite to the magnetic poles (N pole, S pole) of the magnet 318. .

图40所示的平衡器226当中，装在省略的盘片驱动装置上的盘片301沿右旋方向(顺时针方向)旋转。因而，与上述第七实施例至第十一实施例情形相同，盘片301旋转时加速过程中，滚珠324a、324b、324c、324d由惯性力移动，磁体318的磁极配置在与间隔330a、330b、330c、330d相接触的位置上。通过这样配置磁体318的磁极，滚珠324a、324b、324c、324d不论盘片301停止还是低速旋转，总可以在与间隔330a、330b、330c、330d相接触的位置上被吸住并停止。在这种状态下，盘片301高速旋转的话，作用于滚珠324a、324b、324c、324d的离心力大于磁体318磁力时，滚珠324a、324b、324c、324d沿着间隔330a、330b、330c、330d脱离磁体318。盘片301低速旋转时，滚珠324a、324b、324c、324d被磁力吸住，未脱离磁体318，因而，脱离后的滚珠324其速度急剧加快。In the balancer 226 shown in FIG. 40, the disk 301 mounted on the omitted disk drive means rotates in the clockwise direction (clockwise direction). Therefore, similar to the above-mentioned seventh to eleventh embodiments, during the acceleration process of the disk 301 rotation, the balls 324a, 324b, 324c, 324d are moved by inertial force, and the magnetic poles of the magnet 318 are arranged at the intervals 330a, 330b. , 330c, 330d are in contact with each other. By arranging the magnetic poles of the magnet 318 in this way, the balls 324a, 324b, 324c, 324d can always be attracted and stopped at the positions in contact with the spaces 330a, 330b, 330c, 330d no matter whether the disk 301 stops or rotates at a low speed. In this state, if the disc 301 rotates at a high speed, when the centrifugal force acting on the balls 324a, 324b, 324c, and 324d is greater than the magnetic force of the magnet 318, the balls 324a, 324b, 324c, and 324d are separated along the intervals 330a, 330b, 330c, and 330d. magnet 318 . When the disc 301 rotates at a low speed, the balls 324a, 324b, 324c, 324d are attracted by the magnetic force and do not separate from the magnet 318. Therefore, the speed of the separated balls 324 increases sharply.

但间隔330a、330b、330c、330d附近内侧外周壁面325a、325b、325c、325d预计与滚珠324a、324b、324c、324d相碰撞的预计碰撞面设有弹性体341a、341b、341c、341d，因而第十二实施例的平衡器226形成为吸收碰撞时冲击的构成。由于这种构成，第十二实施例的盘片驱动装置可改善滚珠324a、324b、324c、324d和内侧外周壁面325a、325b、325c、325d之间碰撞时产生的噪声。However, elastic bodies 341a, 341b, 341c, 341d are provided on the inner peripheral wall surfaces 325a, 325b, 325c, 325d expected to collide with the balls 324a, 324b, 324c, 324d near the intervals 330a, 330b, 330c, 330d. The balancer 226 of the twelfth embodiment is formed to absorb the shock at the time of collision. Due to this constitution, the disk drive device of the twelfth embodiment can improve the noise generated when the balls 324a, 324b, 324c, 324d collide with the inner peripheral wall surfaces 325a, 325b, 325c, 325d.

弹性体341a、341b、341c、341d的材质，可以用天然橡胶、合成橡胶、海绵等冲击吸收材形成，是能够吸收滚珠324a、324b、324c、324d和内侧外周壁面325a、325b、325c、325d之间碰撞时冲击的材质就行。也可以在内侧外周壁面325a、325b、325c、325d整个面设有弹性体，但为了能够方便地在内侧外周壁面325a、325b、325c、325d上移动滚珠324a、324b、324c、324d，内侧外周壁面325a、325b、325c、325d需要平滑，而滚珠324a、324b、324c、324d则需要不随离心力形变的足够刚性。为了满足这种要求，对于内侧外周壁面325a、325b、325c、325d材料，希望是成型精度高的ABS、聚碳酸酯、聚缩醛等材料、可确保刚性的树脂、铝、黄铜等金属材料。The material of the elastic body 341a, 341b, 341c, 341d can be formed by impact absorbing materials such as natural rubber, synthetic rubber, sponge, etc. The material that impacts when the object collides will do. Elastic bodies may also be provided on the entire surface of the inner peripheral wall surface 325a, 325b, 325c, 325d, but in order to move the balls 324a, 324b, 324c, 324d on the inner peripheral wall surface 325a, 325b, 325c, 325d easily, the inner peripheral wall surface 325a, 325b, 325c, 325d need to be smooth, while balls 324a, 324b, 324c, 324d need to be rigid enough not to deform with centrifugal force. In order to meet this requirement, materials for the inner and outer peripheral walls 325a, 325b, 325c, and 325d are desired to be high-precision molding materials such as ABS, polycarbonate, and polyacetal, and metal materials such as resins that can ensure rigidity, aluminum, and brass. .

上述第七实施例至第十一实施例中的盘片驱动装置，未规定磁体的磁极位置，因而无法确定滚珠脱离磁体的位置。因而第七实施例至第十一实施例中，难以避免滚珠和内侧外周壁面之间的碰撞声。但第十二实施例的盘片驱动装置中，由于可以确定滚珠324a、324b、324c、324d脱离磁体318的位置，因而可以大幅度抑制滚珠324a、324b、324c、324d脱离磁体318时所产生的滚珠324a、324b、324c、324d与内侧外周壁面325a、325b、325c、325d之间的碰撞声。The disc drive devices in the above-mentioned seventh to eleventh embodiments do not specify the magnetic pole positions of the magnets, so the positions where the balls leave the magnets cannot be determined. Therefore, in the seventh embodiment to the eleventh embodiment, it is difficult to avoid the collision sound between the ball and the inner peripheral wall surface. However, in the disk drive device of the twelfth embodiment, since the positions where the balls 324a, 324b, 324c, and 324d are separated from the magnet 318 can be determined, the noise generated when the balls 324a, 324b, 324c, and 324d are separated from the magnet 318 can be greatly suppressed. The collision sound between the balls 324a, 324b, 324c, 324d and the inner peripheral wall surfaces 325a, 325b, 325c, 325d.

上述第七实施例至第十一实施例中，磁体磁力大的场合，滚珠靠离心力脱离磁体时，脱离时盘片的转速较高，滚珠脱离的速度较快。这样磁体磁力大的场合，在盘片高速旋转时，比加速当中所预定的盘片转速慢，故滚珠脱离磁体的时候，有时产生比滚珠和内侧外周壁面之间碰撞还大的冲击声。In the above-mentioned seventh to eleventh embodiments, when the magnetic force of the magnet is large, when the ball is separated from the magnet by centrifugal force, the rotational speed of the disk is relatively high, and the speed of the ball's separation is relatively fast. When the magnetic force of the magnet is strong like this, when the disc rotates at a high speed, it is slower than the predetermined disc rotation speed during acceleration, so when the ball is separated from the magnet, the impact sound is sometimes louder than the collision between the ball and the inner peripheral wall.

而磁体磁力小时，滚珠脱离磁体时的盘片转速较低，滚珠脱离时盘片的速度较慢。这样磁体磁力小的场合，竖直放置盘片驱动装置按低速旋转盘片时，有时由于底盘座振动等造成的干扰，滚珠在盘片达到预定转速之前脱离磁体，产生滚珠和间隔碰撞的冲击声。And when the magnetic force of the magnet is small, the rotating speed of the disk is low when the balls are separated from the magnet, and the speed of the disk is slow when the balls are separated from the magnet. When the magnetic force of the magnet is small, when the disk drive device is placed vertically to rotate the disk at a low speed, sometimes due to the interference caused by the vibration of the chassis seat, the balls will break away from the magnet before the disk reaches the predetermined speed, resulting in the impact sound of balls and spacers colliding. .

第七实施例至第十一实施例中的盘片驱动装置中，磁体磁力过大或过小都容易产生噪声问题，因而磁体需要进行严格的磁化作业，以便磁体能够产生最佳磁力。In the disc drive devices in the seventh to eleventh embodiments, noise problems may easily occur if the magnetic force of the magnet is too large or too small, so the magnet needs to be magnetized strictly so that the magnet can generate the best magnetic force.

本发明第十二实施例盘片驱动装置中，对磁体进行的磁化作业在上述各实施例中并不需要很严格。但可以确定滚珠324a、324b、324c、324d脱离磁体318的位置，因而针对滚珠324a、324b、324c、324d脱离磁体318与内侧外周壁面325a、325b、325c、325d碰撞时的噪声采取措施。因而，第十二实施例有这样优异的效果，磁体318的磁力可通过充分强的磁化使之很宽裕，不需要进行高精度的磁化作业。In the disk drive device according to the twelfth embodiment of the present invention, the magnetization operation of the magnet does not need to be very strict as in the above-mentioned embodiments. However, the positions where the balls 324a, 324b, 324c, and 324d are detached from the magnet 318 can be determined, so measures can be taken for the noise when the balls 324a, 324b, 324c, 324d detach from the magnet 318 and collide with the inner peripheral wall surface 325a, 325b, 325c, 325d. Therefore, the twelfth embodiment has such an excellent effect that the magnetic force of the magnet 318 can be made abundant by sufficiently strong magnetization, and high-precision magnetization work is not required.

本发明第十二实施例的盘片驱动装置中，说明的是对中空环状部进行分割的间隔为4个的情形，本发明间隔个数不限于4个，用2～8个左右间隔分割中空环状部的构成也可获得与第十二实施例相同的效果。In the disk drive device of the twelfth embodiment of the present invention, the description is the case where the hollow annular portion is divided into four intervals. The number of intervals in the present invention is not limited to four, and is divided into about 2 to 8 intervals. Also in the configuration of the hollow annular portion, the same effect as that of the twelfth embodiment can be obtained.

本发明第十二实施例的盘片驱动装置，说明的是在夹紧机构中设置平衡器的例子，平衡器若与盘片旋转中心同轴、并且可与盘片一体旋转设置的话，就可以获得与上述第十二实施例相同的效果。例如，也可以在装上盘片的转台上设置平衡器，或在主轴电动机的转子部设置平衡器，或在底盘座的主轴电动机相对一侧设置平衡器，并将平衡器构成为可与主轴电动机转轴一体旋转。The disc driving device of the twelfth embodiment of the present invention describes an example in which a balancer is provided in the clamping mechanism. If the balancer is coaxial with the disc rotation center and can be integrally rotated with the disc, it can The same effects as those of the above-described twelfth embodiment are obtained. For example, it is also possible to install a balancer on the turntable on which the disk is loaded, or to install a balancer on the rotor portion of the spindle motor, or to arrange a balancer on the opposite side of the chassis base to the spindle motor, and to make the balancer so that it can be connected to the spindle. The rotating shaft of the motor rotates integrally.

《第13实施例》"The Thirteenth Embodiment"

下面，参照附图说明本发明第13实施例的盘片驱动装置。图41为表示于本发明第13实施例盘片驱动装置的夹紧机构设置的平衡器227的内部结构横剖面图。图41中，对具有与上述第7实施例、第8实施例、第9实施例、第10实施例、第11实施例及第12实施例中盘片驱动装置的构件实质上相同功能的构件赋以相同标号，引用先前的实施例的说明，省略重复的说明。第13实施例中的平衡器227与上述图12所示纵剖面图的平衡器221的图示相同，故省略第13实施例平衡器227的纵剖面图。Next, a disk drive device according to a thirteenth embodiment of the present invention will be described with reference to the drawings. FIG. 41 is a cross-sectional view showing the internal structure of a balancer 227 provided in the clamping mechanism of the disk drive device according to the thirteenth embodiment of the present invention. In FIG. 41, components having substantially the same functions as those of the disk drive apparatus in the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, and the twelfth embodiment The same reference numerals are used to refer to the previous descriptions of the embodiments, and redundant descriptions are omitted. The balancer 227 in the thirteenth embodiment is the same as the balancer 221 shown in the longitudinal sectional view in FIG. 12 described above, so the longitudinal sectional view of the balancer 227 in the thirteenth embodiment is omitted.

本发明第13实施例的盘片驱动装置利用特殊形状的隔板342a、342b、342c、342d分割夹紧机构316设置的平衡器的中空环状部320，结构上使磁铁318的磁极(N极，S极)相对于与隔板342a、342b、342c、342d呈规定的位置关系。The disk driving device of the thirteenth embodiment of the present invention utilizes the spacers 342a, 342b, 342c, 342d of special shape to divide the hollow annular portion 320 of the balancer provided by the clamping mechanism 316, and the magnetic pole (N pole) of the magnet 318 is structurally , S pole) is in a predetermined positional relationship with the separators 342a, 342b, 342c, and 342d.

图41表示第13实施例盘片驱动装置的平衡器中隔板342a、342b、342c、342d、磁性球324a、324b、324c、324d和磁铁318的磁极的位置关系。如图41所示，磁铁318的磁极配置在隔板342a、342b、342c、342d的旁边，在盘片301停止旋转或低速旋转时，结构上保持使磁性球324a、324b、324c、324d吸附于磁铁318的磁极位置的状态。且结构上使隔板342a、342b、342c、342d的形状具有曲面并与内侧外壁面325a、325b、325c、325d相连续。FIG. 41 shows the positional relationship of spacers 342a, 342b, 342c, 342d, magnetic balls 324a, 324b, 324c, 324d, and magnetic poles of magnets 318 in the balancer of the disk drive device of the thirteenth embodiment. As shown in FIG. 41, the magnetic poles of the magnet 318 are disposed beside the partitions 342a, 342b, 342c, and 342d. When the disk 301 stops rotating or rotates at a low speed, the structure keeps the magnetic balls 324a, 324b, 324c, and 324d adsorbed on them. The state of the magnetic pole position of the magnet 318 . And structurally, the partitions 342a, 342b, 342c, 342d have curved surfaces and are continuous with the inner and outer wall surfaces 325a, 325b, 325c, 325d.

如图41所示，在使盘片301加速旋转的情况下，第13实施例的平衡器227中的磁性球324a、324b、324c、324d在惯性力作用下移动，而磁铁318的磁极(N极，S极)配置在与隔板342a、342b、342c、342d接触的预定位置。由此，在盘片301停止或低速旋转时，球324a、324b、324c、324d总是吸附在与隔板342a、342b、342c、342d相接触的位置。在上述状态下，一旦使盘片301高速旋转，则当作用于球324a、324b、324c、324d的离心力大于磁铁318的磁力时，球324a、324b、324c、324d就沿隔板342a、342b、342c、342d移动，脱离磁铁318。As shown in FIG. 41, in the case of accelerating the rotation of the disk 301, the magnetic balls 324a, 324b, 324c, 324d in the balancer 227 of the thirteenth embodiment move under the action of inertial force, and the magnetic poles (N pole, S pole) are arranged at predetermined positions in contact with the separators 342a, 342b, 342c, 342d. Thus, when the disk 301 stops or rotates at a low speed, the balls 324a, 324b, 324c, and 324d are always attracted to positions in contact with the partitions 342a, 342b, 342c, and 342d. In the above state, once the disk 301 is rotated at a high speed, when the centrifugal force acting on the balls 324a, 324b, 324c, 324d is greater than the magnetic force of the magnet 318, the balls 324a, 324b, 324c, 324d will move along the partitions 342a, 342b, 342c, 342d move away from magnet 318.

第13实施例中，隔板342a、342b、342c、342d与球324a、324b、324c、324d的接触面的形状为曲面，而不是与从平衡器227中心沿半径方向延伸的直线平行的形状。由此，球324a、324b、324c、324d脱离磁铁318时，沿隔板342a、342b、342c、342d的曲面滚动到达中空环状部320的内侧外壁面325a、325b、325c、325d。In the thirteenth embodiment, the shape of the contact surfaces of the spacers 342a, 342b, 342c, 342d and the balls 324a, 324b, 324c, 324d is a curved surface instead of a shape parallel to a straight line extending radially from the center of the balancer 227. Thus, when the balls 324a, 324b, 324c, 324d are detached from the magnet 318, they roll along the curved surfaces of the partitions 342a, 342b, 342c, 342d and reach the inner and outer wall surfaces 325a, 325b, 325c, 325d of the hollow annular portion 320.

如图41所示，从隔板342a、342b、342c、342d向内侧外壁面325a、325b、325c、325d连续形成的曲面形状，其曲率比球324a、324b、324c、324d的曲率小。由此，球324a、324b、324c、324d到达内侧外壁面325a、325b、325c、325d时，球324a、324b、324c、324d的离心力朝着沿内侧外壁面325a、325b、325c、325d转动的方向变化。因此，在第13实施例中，球324a、324b、324c、324d脱离磁铁318后，球324a、324b、324c、324d与内侧外壁面325a、325b、325c、325d不会发生冲击，故能防止冲击时产生的噪声。As shown in FIG. 41, the curved shape continuously formed from the partitions 342a, 342b, 342c, and 342d toward the inner outer wall surfaces 325a, 325b, 325c, and 325d has a curvature smaller than that of the balls 324a, 324b, 324c, and 324d. As a result, when the balls 324a, 324b, 324c, and 324d reach the inner outer wall surfaces 325a, 325b, 325c, and 325d, the centrifugal force of the balls 324a, 324b, 324c, and 324d will rotate along the inner outer wall surfaces 325a, 325b, 325c, and 325d. Variety. Therefore, in the thirteenth embodiment, after the balls 324a, 324b, 324c, 324d are separated from the magnet 318, the balls 324a, 324b, 324c, 324d will not collide with the inside outer wall surfaces 325a, 325b, 325c, 325d, so the shock can be prevented. noise generated when.

如上所述，在本发明第13实施例的盘片驱动装置中，与前述第12实施例情形一样，其结构能指定球脱离磁铁的位置，使球不会冲击内侧外壁面，因而磁铁的磁力有余量，能进行足够强的磁化。As mentioned above, in the disk drive device of the thirteenth embodiment of the present invention, as in the case of the aforementioned twelfth embodiment, its structure can designate the position where the ball breaks away from the magnet, so that the ball will not hit the inner outer wall surface, so the magnetic force of the magnet With a margin, sufficiently strong magnetization can be performed.

在本发明第13实施例的盘片驱动装置中，所说明的分割中空环状部的隔板数为4个，但本发明不限定于4个隔板数，用2—8个左右的隔板分割中空环状部的结构也能获得与第13实施例相同的效果。In the disk drive device according to the thirteenth embodiment of the present invention, the number of spacers for dividing the hollow annular portion described is four, but the present invention is not limited to the number of four spacers, and about 2-8 spacers are used. The same effect as that of the thirteenth embodiment can be obtained also in the structure in which the plate divides the hollow annular portion.

在本发明第13实施例的盘片驱动装置中，是以将平衡器设置在夹紧机构为例进行了说明，但如果设置与盘片旋转中心同轴、与盘片成一体旋转的平衡器，也能获得与第13实施例一样的效果。例如，结构上也可将平衡器设置在安装盘片的转台，或设置在主轴电动机的转子部，或设置在底座的与主轴电动机相反侧的位置，使平衡器可与主轴电动机轴一体旋转。In the disk drive device according to the thirteenth embodiment of the present invention, the description was given by taking the balancer installed in the clamping mechanism as an example. , can also obtain the same effect as the thirteenth embodiment. For example, structurally, the balancer can also be installed on the turntable where the disk is installed, or on the rotor part of the spindle motor, or on the opposite side of the base to the spindle motor, so that the balancer can rotate integrally with the spindle motor shaft.

如上所述，按照本发明第7实施例至第13实施例的盘片驱动装置，通过设置可与盘片一体旋转的平衡器，构成的所述平衡器利用隔板将中空环状部所示的环状轨道分割成多个圆弧状轨道，并有平衡部件在各轨道移动，就可获得与盘片质量失衡的大小无关、可靠抑制在盘片高速旋转下易产生的振动的效果。As described above, according to the disk drive apparatuses of the seventh to thirteenth embodiments of the present invention, by providing a balancer that can rotate integrally with the disk, the balancer is constructed by dividing the hollow annular portion as shown by the partition plate. The ring-shaped track is divided into multiple arc-shaped tracks, and the balance parts move on each track, so that the effect of reliably suppressing the vibration that is easy to occur under the high-speed rotation of the disc has nothing to do with the size of the disc mass imbalance.

即使盘片高速旋转，本发明利用该效果也可稳定地进行记录或重放，可实现低噪声、具有强抗振、抗冲击特性的可高速数据传送的盘片驱动装置。Even if the disk rotates at high speed, the present invention can stably record or reproduce by using this effect, and can realize a disk drive device capable of high-speed data transmission with low noise, strong anti-vibration and anti-shock characteristics.

《第14至第19实施例要解决的问题》"Problems to be Solved in the 14th to 19th Embodiments"

近年来，在记录重放数据的盘片驱动装置中，为了提高数据传送的速度，作为记录媒体的盘片的旋转速度不断提高。但是，随着盘片转速的上升盘片的振动急剧加大。In recent years, in a disk drive device for recording and reproducing data, the rotation speed of a disk as a recording medium has been increased in order to increase the speed of data transfer. However, the vibration of the disk increases sharply with the increase of the rotation speed of the disk.

在数据的记录重放中，盘片的振动传送给主轴电动机、底架及横移用的导轨或支臂，最终引起读写盘片上信号的读写头的振动。因此，用与已有构造相同的盘片驱动装置难以稳定进行记录重放。换言之，为了进行稳定的记录重放，不得不将盘片的转速选择得比理论上必需的值低，以便抑制盘片的振动。因此，已往的盘片驱动装置存在所谓实际上数据传送速度不够、记录重放的速度不高的问题。In the recording and playback of data, the vibration of the disk is transmitted to the spindle motor, chassis, and guide rail or support arm for lateral movement, and finally causes the vibration of the read-write head that reads and writes the signal on the disk. Therefore, it is difficult to stably perform recording and reproduction with a disk drive device having the same structure as the conventional one. In other words, in order to perform stable recording and reproduction, the rotational speed of the disk has to be selected lower than theoretically necessary in order to suppress the vibration of the disk. Therefore, the conventional disk drive device has the problem that the actual data transfer speed is insufficient, and the recording/reproducing speed is not high.

此外，在个人计算机等中，盘片装置产生的振动会出现引发一个盘片装置外的另一盘片装置误动作的可能性。盘片装置振动产生的噪声还导致妨碍办公室中的业务或降低了家庭中娱乐温馨氛围的后果。In addition, in a personal computer or the like, there is a possibility that vibration generated by a disk drive may cause malfunction of another disk drive other than one disk drive. The noise generated by the vibration of the disk drive also has the effect of disrupting business in an office or reducing the ambience of entertainment in a home.

此外，盘片振动加速了主轴电动机的轴承及主轴的磨损、性能下降，从而又进一步导致盘片振动的加大。因此，为了通过提高盘片转速来提高数据传送速度，抑制盘片振动成为要实现的重要课题。In addition, the vibration of the disk accelerates the wear of the bearing and the spindle of the spindle motor, and the performance decreases, which further leads to the increase of the vibration of the disk. Therefore, in order to increase the data transfer rate by increasing the rotational speed of the disk, suppressing the vibration of the disk has become an important subject to be realized.

下面，参照附图说明已往盘片驱动装置的一例。在图42中，盘片501放置于转台582上，经夹紧机构581固定后，由主轴电动机502驱动旋转。读写头503读取记录于盘片501的数据，或对盘片501写数据。横移机构505由齿条506和齿轮507等构成，将横移电动机504的旋转运动变换为直线运动传递给读写头503。通过该横移机构505驱动读写头503沿盘片501的半径方向移动。底座508上安装有主轴电动机502、横移电动机504、及横移机构505。利用隔振子509(弹性体)衰减装置外部传给底座508的振动或冲击，底座508通过该隔振子509安装于主底架510。Next, an example of a conventional disk drive device will be described with reference to the drawings. In FIG. 42 , the disk 501 is placed on the turntable 582 , and after being fixed by the clamping mechanism 581 , it is driven to rotate by the spindle motor 502 . The read/write head 503 reads data recorded on the disk 501 or writes data to the disk 501 . The traverse mechanism 505 is composed of a rack 506 and a gear 507 , etc., and converts the rotational motion of the traverse motor 504 into linear motion and transmits it to the read/write head 503 . The traversing mechanism 505 drives the read/write head 503 to move along the radial direction of the disk 501 . A spindle motor 502 , a traverse motor 504 , and a traverse mechanism 505 are installed on the base 508 . Vibration isolators 509 (elastic bodies) are used to attenuate the vibration or impact transmitted to the base 508 from the outside of the device, and the base 508 is installed on the main chassis 510 through the vibration isolators 509 .

构成的上述盘片驱动装置通过安装于主底架510的框架(未图示)装入计算机装置等设备中。The configured disk drive device described above is installed in equipment such as a computer device through a frame (not shown) attached to the main chassis 510 .

图43是表示已往盘片驱动装置主轴电动机502附近的侧剖面图。转台582固定于主轴电动机的轴528上，可旋转支持着盘片501的夹紧区511。与盘片501的夹紧孔512配合的轴套522与转台582形成一体。利用盘片501的夹紧孔512与轴套522的配合对盘片501进行定位。FIG. 43 is a side sectional view showing the vicinity of the spindle motor 502 of a conventional disk drive device. The turntable 582 is fixed on the shaft 528 of the spindle motor and rotatably supports the clamping area 511 of the disk 501 . A shaft sleeve 522 that fits with the clamping hole 512 of the disk 501 is integrally formed with the turntable 582 . The disc 501 is positioned by the cooperation between the clamping hole 512 of the disc 501 and the sleeve 522 .

在轴套522与夹紧机构581相对的面(图43中的上面)上形成定位孔523。在轴套522上面埋设固定有环状的对置磁轭524。A positioning hole 523 is formed on a surface (upper surface in FIG. 43 ) of the sleeve 522 opposite to the clamp mechanism 581 . An annular opposing yoke 524 is embedded and fixed on the upper surface of the sleeve 522 .

如图43所示，夹紧机构581包含与安装后的盘片501的上面靠紧的盘片夹套542和磁铁支座543。盘片夹套542下面形成有与盘片501接触的平坦的面。磁铁支座543安装有中心突起546，用于与设置在转台582的轴套522的定位孔523相结合，确保转台582与夹紧机构581有相同的中心位置。磁铁支座543的内部安装有磁铁544和后磁轭545。As shown in FIG. 43 , the clamping mechanism 581 includes a disk jacket 542 and a magnet support 543 that are close to the upper surface of the installed disk 501 . A flat surface that contacts the disk 501 is formed on the lower surface of the disk jacket 542 . The magnet support 543 is equipped with a central protrusion 546 for combining with the positioning hole 523 of the sleeve 522 provided on the turntable 582 to ensure that the turntable 582 and the clamping mechanism 581 have the same center position. A magnet 544 and a rear yoke 545 are mounted inside the magnet support 543 .

在以上所述构成的已往盘片驱动装置中，在夹住盘片501的状态下，盘片501通过夹紧孔512与轴套522的配合被安装在转台582上。此时，利用包含在夹紧机构581内的磁铁544与固定于转台582中轴套522的对置磁轭524之间作用的磁力将盘片501保持住。由此，利用夹紧机构581和转台582夹住的盘片501随主轴电动机502的旋转与转台582和夹紧机构581成一体旋转。In the conventional disk drive device configured as described above, the disk 501 is mounted on the turntable 582 through the cooperation between the clamp hole 512 and the boss 522 in the state of clamping the disk 501 . At this time, the disk 501 is held by the magnetic force acting between the magnet 544 included in the clamping mechanism 581 and the opposing yoke 524 fixed to the sleeve 522 in the turntable 582 . Thus, the disk 501 clamped by the clamp mechanism 581 and the turntable 582 rotates integrally with the turntable 582 and the clamp mechanism 581 as the spindle motor 502 rotates.

但是，在如上构成的已有盘片驱动装置中，一旦盘片501高速旋转，则由盘片501厚度不均匀或转台582的振摆等产生失衡，导致盘片501激剧振动。However, in the conventional disk drive device constructed as above, once the disk 501 rotates at a high speed, the disk 501 vibrates sharply due to uneven thickness of the disk 501 or vibration of the turntable 582 and the like.

图44为表示将盘片501安装于已往盘片驱动装置的转台582上使盘片501旋转情况下盘片501的振动状态的侧剖面图。FIG. 44 is a side sectional view showing a vibration state of the disk 501 when the disk 501 is mounted on a turntable 582 of a conventional disk drive apparatus and the disk 501 is rotated.

图44所示为已有盘片驱动装置中的转台582相对于主轴528倾斜安装着。将盘片501放置于这样的转台582高速旋转时，在盘片501中与主轴528垂直的面上沿以主轴582为中心的放射方向会产生离心力X。该离心力X对盘片501产生盘片501半径方向的张力A和在与盘片501记录面垂直方向上产生弯曲盘片501的弯曲力B。该张力A和弯曲力B与盘片501旋转频率的平方大致成比例地增加。FIG. 44 shows that the turntable 582 is installed obliquely with respect to the main shaft 528 in the conventional disk drive device. When the disk 501 is placed on such a turntable 582 and rotated at high speed, a centrifugal force X is generated on the surface of the disk 501 perpendicular to the spindle 528 in a radial direction centered on the spindle 582 . The centrifugal force X generates a tension A in the radial direction of the disk 501 and a bending force B that bends the disk 501 in a direction perpendicular to the recording surface of the disk 501 on the disk 501 . The tension A and the bending force B increase approximately in proportion to the square of the rotation frequency of the disk 501 .

在离心力X产生的力中，对盘片501的记录面在大致垂直方向中起作用的弯曲力B引起盘片501的弹性形变。在这种状态下，盘片501旋转时，存在着盘片501振动急剧加大的旋转频率。Among the forces generated by the centrifugal force X, the bending force B acting in a substantially vertical direction on the recording surface of the disk 501 causes elastic deformation of the disk 501 . In this state, when the disk 501 rotates, there is a rotation frequency at which the disk 501 vibrates sharply.

这就是盘片501旋转频率的整数倍频率与盘片501的共振频率一致时产生的共振现象。通常，所有固体中存在取决于各自的材质、形状的共振频率，进行的设计要使这些固体旋转、振动时，使前述的共振频率与旋转频率或振动频率的整数倍不一致。This is the resonance phenomenon that occurs when the integral multiple frequency of the rotation frequency of the disk 501 is consistent with the resonant frequency of the disk 501 . Generally, all solids have resonant frequencies depending on their materials and shapes, and they are designed so that when these solids rotate and vibrate, the aforementioned resonant frequencies do not match the integral multiples of the rotation frequency or vibration frequency.

然而，像盘片驱动装置那样，一边高速旋转盘片501，一边将读写头正确地定位在规定位置的情况下，或使盘片的旋转频率在一定幅度范围内的情况下，不可避免地存在共振现象。However, when the head is accurately positioned at a predetermined position while rotating the disk 501 at a high speed like the disk drive device, or when the rotation frequency of the disk is within a certain range, unavoidable There is a resonance phenomenon.

在已有的盘片驱动装置中，由于盘片501的旋转频率低，故盘片501中产生的离心力X小，作为该离心力X的分力也就是使盘片弯曲的力B小。由此，在已往的盘片驱动装置中，因盘片501虽共振但振幅小，故问题还不明显。但是，近年来盘片501的旋转速度越来越高，故日益迫切希望解决盘片501振动引起的问题。In the conventional disk drive device, since the rotation frequency of the disk 501 is low, the centrifugal force X generated in the disk 501 is small, and the component force of the centrifugal force X, that is, the force B that bends the disk is small. Therefore, in the conventional disk drive apparatus, the problem is not obvious because the disk 501 resonates but the vibration amplitude is small. However, in recent years, the rotation speed of the disk 501 has become higher and higher, so it is increasingly desired to solve the problem caused by the vibration of the disk 501 .

盘片501具有由其材料的弹性系数、厚度和直径等形状决定的固有振动模式(形态)。作为振动模式，如有“2等分模式”，“4等分模式”，“6等分模式”，“8等分模式”等。下面，说明这些振动模式。The disk 501 has a natural vibration mode (morphology) determined by its material's elastic constant, thickness, diameter, and other shapes. As the vibration mode, there are "half-division mode", "quaternary division mode", "sixth division mode", "eight division mode" and the like. Next, these vibration modes will be described.

图45为说明盘片501在作为共振频率中最低、最单纯振动模式的“2等分模式”振动情况的盘片501的平面图。如图45所示，盘片501旋转中，盘片501出现“2等分模式”的振动。在图45中，(a)所示盘片501上所画的点划线表示振动的峰点位置，(b)所示盘片501上所画的虚线表示振动的谷点位置。这样，所谓“2等分模式”振动就是一边交替产生图45(a)和图45(b)所示状态，一边盘片501在振动。FIG. 45 is a plan view of the disk 501 illustrating how the disk 501 vibrates in the "half-half mode" which is the lowest and simplest vibration mode among resonance frequencies. As shown in FIG. 45 , while the disk 501 is rotating, the disk 501 vibrates in a "half-half mode". In FIG. 45 , the dotted line drawn on the disc 501 shown in (a) indicates the peak position of the vibration, and the dotted line drawn on the disc 501 shown in (b) indicates the valley point position of the vibration. In this way, the so-called "bisection mode" vibration means that the disk 501 vibrates while alternately producing the states shown in FIG. 45(a) and FIG. 45(b).

图46是说明盘片501按“4等分模式”振动情况的盘片501的平面图。如图46所示，与前述图45一样，盘片501交替产生图46(a)和(b)所示状态，以“4等分模式”振动。同样，图47为表示盘片501按“6等分模式”振动状态的盘片501的平面图，图48表示盘片501按“8等分模式”振动状态的盘片501的平面图。Fig. 46 is a plan view of the disk 501 illustrating how the disk 501 vibrates in the "quadrate mode". As shown in FIG. 46, like the aforementioned FIG. 45, the disc 501 alternately produces the states shown in FIG. 46 (a) and (b), vibrating in a "quadrate mode". Similarly, FIG. 47 is a plan view of the disc 501 in which the disc 501 vibrates in the "sixth mode", and Fig. 48 shows a plan view of the disc 501 in the "eight mode".

盘片501旋转、盘片501振动、在半径方向交替产生振动的峰点和谷点的情况下，盘片501按图45至图48所示的“2等分模式”、“4等分模式”、“6等分模式”及“8等分模式”振动。盘片501振动时，对应于该盘片501固有的共振频率以特定的振动模式振动。虽然，实际上还存在盘片501的共振频率高而更复杂的振动模式，但因振幅小，故从本发明说明中省略。When the disk 501 rotates, the disk 501 vibrates, and the peaks and valleys of the vibration are alternately generated in the radial direction, the disk 501 follows the "half-division mode" and "four-division mode" shown in Fig. 45 to Fig. 48 ”, “Sixth Mode” and “Eighth Mode” vibrate. When the disk 501 vibrates, it vibrates in a specific vibration mode corresponding to the natural resonance frequency of the disk 501 . Although there actually exists a more complex vibration mode with a higher resonant frequency of the disk 501, the amplitude is smaller, so it is omitted from the description of the present invention.

图49是表示已有盘片驱动装置中盘片振动分析结果的曲线图。在该振动分析中，盘片501以100Hz的旋转频率旋转。如用与“2等分模式”的共振频率一致的旋转频率使盘片501旋转时，对旋转时的盘片501的振动进行富利叶变换，振动分析的结果是分割成不同频率的盘片501的振动。在图49中，纵轴表示盘片振幅(dB)，横轴表示盘片501的振动频率(Hz)。Fig. 49 is a graph showing the results of disc vibration analysis in a conventional disc drive unit. In this vibration analysis, the disk 501 was rotated at a rotation frequency of 100 Hz. If the disk 501 is rotated at a rotation frequency that matches the resonant frequency of the "bisection mode", Fourier transform is performed on the vibration of the disk 501 during rotation, and the result of the vibration analysis is divided into disks of different frequencies. 501 vibrations. In FIG. 49 , the vertical axis represents the disk amplitude (dB), and the horizontal axis represents the vibration frequency (Hz) of the disk 501 .

如图49所示，已往盘片驱动装置中的盘片501的振动状态，在特定的振动频率存在离散的极值。在图49所示的曲线中，从横轴振动频率小的一侧离散的极值起依次为“2等分模式”、“4等分模式”、“6等分模式”、“8等分模式”的振动模式的各个共振频率存在的振动峰点值。As shown in FIG. 49, the vibration state of the disk 501 in the conventional disk drive apparatus has discrete extreme values at a specific vibration frequency. In the curve shown in Figure 49, from the discrete extremum on the side where the vibration frequency of the horizontal axis is small, there are "half-half mode", "quaternary mode", "sixth-half mode", "eight-half The vibration peak value of each resonant frequency of the vibration mode of "mode".

如图49所示，共振频率越低，振幅越大，在已往的盘片驱动装置中设计成使读写头503跟踪盘片501的振动。这样一来，控制盘片驱动装置使得通过读写头的跟踪抵消盘片501的振动。若是盘片501的共振频率低的情况，读写头503则有可能几乎100％地抵除盘片501的振幅。但是，随着以“4等分模式”、“6等分模式”、“8等分模式”共振的共振频率增高，读写头503对盘片501振动的跟踪变得困难起来，对数据的记录重放产生不利影响。As shown in FIG. 49 , the lower the resonance frequency, the larger the amplitude. In the conventional disk drive device, the head 503 is designed to follow the vibration of the disk 501 . In this way, the disk drive device is controlled so that the vibration of the disk 501 is canceled out by the tracking of the head. If the resonant frequency of the disk 501 is low, the read/write head 503 may cancel the vibration amplitude of the disk 501 almost 100%. However, as the resonant frequency of resonance in "quadrate mode", "six-equal-division mode" and "eight-divided mode" increases, it becomes difficult for the head 503 to track the vibration of the disk 501. Record playback is adversely affected.

另外，即使读写头503能跟踪盘片501的振动，也会由于盘片501的振动如前述已有技术栏中所记载的，将构成引发其它盘片驱动装置的误动作、产生噪声、缩短轴承寿命等的原因，而必须尽可能地降低盘片501的振动。In addition, even if the read-write head 503 can track the vibration of the disk 501, the vibration of the disk 501 will cause malfunction of other disk drive devices, generate noise, shorten The vibration of the disc 501 must be reduced as much as possible due to reasons such as bearing life.

盘片501的振动不只是起因于前面所述的转台582倾斜。由于盘片501的振摆、盘片501的最外周和夹紧孔512的偏移引起的偏心等也会引起这种振动。The vibration of the disk 501 is not caused only by the inclination of the turntable 582 as described above. Such vibrations are also caused by runout of the disk 501 , eccentricity caused by deviation of the outermost periphery of the disk 501 and the clamp hole 512 , and the like.

本发明人通过详细观测盘片501的振动，发现了与至此所讨论的问题不一样的影响盘片501振动的新因素。所谓新因素就是，压紧盘片501中夹紧区511的夹紧机构581中的盘片压紧面547的平面度。The inventors of the present invention discovered a new factor affecting the vibration of the disk 501 that is different from the problems discussed so far by observing the vibration of the disk 501 in detail. The so-called new factor is the flatness of the disc pressing surface 547 in the clamping mechanism 581 that presses the clamping area 511 in the disc 501 .

夹紧机构581的盘片压紧面547初看为平面，但在通常使用的树脂成型件中存在着微小的凹凸。若用形成平面状的砂纸对有这种凹凸的夹紧机构581的盘片压紧面547稍作研磨，就能证实如图50(b)所示的3点磨损部分。图50(a)是已有盘片驱动装置中夹紧机构581的侧剖面图，图50(b)是表示图50(a)夹紧机构581的盘片压紧面547的底面图。该图50(b)斜线所示的磨损部分表示：盘片压紧面547成型时因变形而形成3个凸起部分，当用转台582夹紧盘片501时，不是在盘片501的夹紧区511的整个面而是仅在其3处压紧盘片501。The disc pressing surface 547 of the clamp mechanism 581 is flat at first glance, but there are minute unevennesses in a generally used resin molding. If the disk pressing surface 547 of the clamping mechanism 581 having such unevenness is slightly ground with a flat sandpaper, the three-point worn part as shown in FIG. 50(b) can be confirmed. 50(a) is a side sectional view of a clamping mechanism 581 in a conventional disk drive device, and FIG. 50(b) is a bottom view showing the disk pressing surface 547 of the clamping mechanism 581 in FIG. 50(a). The worn part shown by the slanted line in Figure 50(b) indicates that: when the disc pressing surface 547 is molded, three convex parts are formed due to deformation. The entire surface of the clamping area 511 is pressed against the disk 501 only at three of them.

图51是用图形表示用夹紧机构581和转台582能可靠夹紧和不能夹紧盘片501时盘片501上下方向自由度的剖面图。51 is a cross-sectional view graphically showing the degree of freedom of the disk 501 in the vertical direction when the disk 501 can be securely clamped and cannot be clamped by the clamping mechanism 581 and the turntable 582.

图51(a)是由于未用夹紧机构581的盘片压紧面547压紧盘片501的夹紧区511因而从盘片501中最外周至与轴套522接触的位置盘片501可能产生的向上方向变形的状态。Fig. 51(a) shows that the disk 501 may be from the outermost periphery of the disk 501 to the position in contact with the shaft sleeve 522 due to the clamping area 511 of the disk 501 being pressed against the disk pressing surface 547 of the clamping mechanism 581. The resulting state of deformation in the upward direction.

图50(b)是由于夹紧机构581的盘片压紧面547压紧盘片501的夹紧区511因而从盘片501中最外周至压紧面547的最外周位置盘片501可能产生的向上方向变形状态。Fig. 50(b) shows that the disk 501 may produce deformation state in the upward direction.

如将两者比较，图51(a)所示盘片501比图51(b)所示盘片501有更宽的可变形范围，盘片501的上下方向的振幅大。Comparing the two, the disc 501 shown in FIG. 51( a ) has a wider deformable range than the disc 501 shown in FIG. 51( b ), and the amplitude of the up and down direction of the disc 501 is larger.

若考虑与上述夹紧机构581情况同样的情况，就可想像，转台582支持盘片501的面的平面度也是影响盘片501振动的一大因素。Considering the same situation as the clamping mechanism 581 above, it can be imagined that the flatness of the surface of the turntable 582 supporting the disk 501 is also a major factor affecting the vibration of the disk 501 .

与夹紧机构581成形时变形产生凹凸的相同的状态也会发生在夹紧机构581与盘片501之间落入灰尘或污垢的情况下。将盘片501放置于转台582后，如头发等异物偶然落在盘片501上，从其上用夹紧机构581夹紧盘片501，在使盘片501高速旋转情况下，与有凹凸的夹紧机构581夹紧盘片501的情形一样，盘片501会急剧振动。这不只是在夹紧机构581与盘片501间发生的问题，也是在转台582与盘片501间掉入灰尘或污垢等异物时发生的问题。The same state as the deformation of the clamp mechanism 581 to produce unevenness occurs also when dust or dirt falls between the clamp mechanism 581 and the disk 501 . After the disk 501 is placed on the turntable 582, foreign objects such as hair accidentally fall on the disk 501, and the disk 501 is clamped by the clamping mechanism 581 from above. As in the case where the clamping mechanism 581 clamps the disc 501, the disc 501 vibrates sharply. This is not only a problem that occurs between the clamp mechanism 581 and the disk 501, but also a problem that occurs when foreign matter such as dust or dirt falls between the turntable 582 and the disk 501.

本发明有关的第14实施例和从后述的第15实施例至第19实施例所提供的盘片驱动装置，是鉴于上述认识和与此相关的研究，在使盘片高速旋转情况下，通过降低盘片产生的振动能稳定地进行记录重放，同时保持数据传输的高速度并降低向盘片驱动装置外部传出的振动或噪声，提高了主轴电动机轴承的寿命。The fourteenth embodiment of the present invention and the disk drive device provided by the fifteenth to nineteenth embodiments described later are based on the above knowledge and research related to it. When the disk is rotated at a high speed, By reducing the vibration generated by the disk, stable recording and playback can be performed, while maintaining a high speed of data transmission and reducing the vibration or noise transmitted to the outside of the disk drive device, and the life of the spindle motor bearing is improved.

(第14实施例)(14th embodiment)

下面，参照附图52至图58说明本发明第14实施例的盘片驱动装置。Next, a disk drive device according to a fourteenth embodiment of the present invention will be described with reference to FIGS. 52 to 58. FIG.

图52是表示将盘片501放置于本发明第14实施例盘片驱动装置、并用夹紧机构541夹紧的状态的立体图。图53是表示第14实施例盘片驱动装置中主轴电动机502附近的侧剖面图。图54是表示第14实施例盘片驱动装置中夹紧机构541的侧剖面图(a)和底视图(b)。如图54(b)所示，在夹紧机构541的底面配置有多个夹紧机构突起551。FIG. 52 is a perspective view showing a state in which a disk 501 is set in a disk drive device according to a fourteenth embodiment of the present invention and clamped by a clamp mechanism 541. FIG. Fig. 53 is a side sectional view showing the vicinity of the spindle motor 502 in the disk drive apparatus of the fourteenth embodiment. Fig. 54 is a side sectional view (a) and a bottom view (b) showing a clamp mechanism 541 in the disk drive device of the fourteenth embodiment. As shown in FIG. 54( b ), a plurality of clamping mechanism protrusions 551 are arranged on the bottom surface of the clamping mechanism 541 .

在图52中，盘片501放置在转台521上，用夹紧机构541对其固定后，由主轴电动机502驱动旋转。读写头503读取记录在盘片501的数据，或对盘片501进行数据写入。横移机构505由齿条506和齿轮507等构成，将横移电动机504的旋转运动变换为直线运动传递给读写头503。利用该横移机构505，读写头503沿盘片501的半径方向移动。底座508上安装有主轴电动机502、横移电动机504及横移机构505。利用隔振子509(弹性体)衰减装置外部传给底座508的振动或冲击。底座508通过该隔振子509安装于主底架510。In FIG. 52 , a disk 501 is placed on a turntable 521 , fixed by a clamping mechanism 541 , and driven to rotate by a spindle motor 502 . The head 503 reads data recorded on the disk 501 or writes data to the disk 501 . The traverse mechanism 505 is composed of a rack 506 and a gear 507 , etc., and converts the rotational motion of the traverse motor 504 into linear motion and transmits it to the read/write head 503 . Using this traverse mechanism 505 , the head 503 moves in the radial direction of the disk 501 . A spindle motor 502 , a traverse motor 504 and a traverse mechanism 505 are installed on the base 508 . Vibrator 509 (elastic body) is used to attenuate the vibration or impact transmitted to the base 508 from the outside of the device. The base 508 is installed on the main chassis 510 through the vibration isolator 509 .

第14实施例构成的盘片驱动装置，通过安装于主底架510的框架(未图示)装入计算机装置等设备中。The disk drive unit according to the fourteenth embodiment is incorporated into equipment such as computer equipment through a frame (not shown) attached to the main chassis 510 .

图53是表示第14实施例盘片驱动装置中主轴电动机502附近的侧剖面图。主轴电动机502具有：与主轴528成一体固定的转子525；和配置在该转子525内侧的转子用磁铁526，与该转子用磁铁526相对设置有绕组527。利用径向轴承529和止推轴承530可旋转支持着主轴528。主轴电动机502的固定部固定于底座508。Fig. 53 is a side sectional view showing the vicinity of the spindle motor 502 in the disk drive apparatus of the fourteenth embodiment. The spindle motor 502 has a rotor 525 integrally fixed to a spindle 528 , and a rotor magnet 526 disposed inside the rotor 525 , and a winding 527 is provided facing the rotor magnet 526 . The main shaft 528 is rotatably supported by a radial bearing 529 and a thrust bearing 530 . The fixed portion of the spindle motor 502 is fixed to the base 508 .

金属制转台521固定于主轴电动机的轴528上，可旋转地支持着盘片501的夹紧区511。转台521上一体形成有与盘片501的夹紧孔512配合的轴套522。通过盘片501的夹紧孔512与轴套522的配合，盘片501对准中心。The metal turntable 521 is fixed on the shaft 528 of the spindle motor, and rotatably supports the clamping area 511 of the disk 501 . A shaft sleeve 522 cooperating with the clamping hole 512 of the disc 501 is integrally formed on the turntable 521 . Through the cooperation between the clamping hole 512 of the disc 501 and the sleeve 522, the disc 501 is aligned to the center.

在轴套522对着夹紧机构541的面(图53中的上面)形成有定位孔523。在轴套522的上面埋设固定有环状的对置磁轭524。A positioning hole 523 is formed on the surface of the sleeve 522 facing the clamping mechanism 541 (the upper surface in FIG. 53 ). An annular opposing yoke 524 is buried and fixed on the upper surface of the boss 522 .

如图53所示，树脂制的夹紧机构541具有与安装的盘片501的上面相对的盘片夹套542和磁铁支座543。盘片夹套542的底面形成平坦的面。磁铁支座543固定安装有中心突起546，用以与设置在转台521的轴套522的定位孔523配合，确保转台521和夹紧机构541有相同的中心位置。在磁铁支座543内部固定有磁铁544和后磁轭545。As shown in FIG. 53, a clamp mechanism 541 made of resin has a disk jacket 542 and a magnet holder 543 facing the upper surface of the mounted disk 501. As shown in FIG. The bottom surface of the disk jacket 542 forms a flat surface. The magnet support 543 is fixed with a central protrusion 546 for matching with the positioning hole 523 of the sleeve 522 of the turntable 521 to ensure that the turntable 521 and the clamping mechanism 541 have the same center position. A magnet 544 and a rear yoke 545 are fixed inside the magnet support 543 .

在如上构成的第14实施例盘片驱动装置中，当盘片501夹紧在夹紧机构541与转台521之间的状态下，夹紧孔512与轴套522配合，盘片501安装在转台521上。此时，盘片501通过作用于包含在夹紧机构541内的磁铁544与固定于转台521的对置磁轭524之间的吸引磁力而被保持住。这样保持住的盘片501随主轴电动机502的旋转而与转台521及夹紧机构541作整体旋转。In the disk drive device of the fourteenth embodiment constituted as above, when the disk 501 is clamped between the clamping mechanism 541 and the turntable 521, the clamping hole 512 cooperates with the sleeve 522, and the disk 501 is mounted on the turntable. 521 on. At this time, the disk 501 is held by the attractive magnetic force acting between the magnet 544 included in the clamp mechanism 541 and the opposing yoke 524 fixed to the turntable 521 . The disk 501 thus held rotates integrally with the turntable 521 and the clamp mechanism 541 as the spindle motor 502 rotates.

第14实施例的盘片驱动装置如图54(a)及(b)所示，在构成夹紧机构541底面的盘片夹套542的底面形成有圆柱形的4个夹紧机构突起551。夹紧机构突起551配置在以磁铁支座543的中心突起546的中心轴为中心的圆上，设置在夹紧机构551确实能压紧住盘片501的夹紧区511的位置上。在第14实施例中，夹紧机构突起551形成在离旋转中心15mm的位置。如图54(b)所示，4个夹紧机构突起551设置在4等分圆周的位置，也即，分别设置在每隔90度分割圆周的位置。形成的各夹紧机构突起551的高度(h1)差(平面度)在40μm范围内。转台521盘片放置面中的凹凸的高度差(平面度)比40μm(夹紧机构突起551中的平面度)小得多的情况下，利用4个夹紧机构突起551和转台521能可靠地夹住盘片501。In the disk drive device of the fourteenth embodiment, as shown in FIGS. 54( a ) and ( b ), four cylindrical clamp protrusions 551 are formed on the bottom surface of the disc chuck 542 constituting the bottom surface of the clamp mechanism 541 . The clamping mechanism protrusion 551 is arranged on a circle centered on the central axis of the central protrusion 546 of the magnet support 543 , and is set at a position where the clamping mechanism 551 can indeed press the clamping area 511 of the disc 501 . In the fourteenth embodiment, the clamping mechanism protrusion 551 is formed at a position 15 mm away from the rotation center. As shown in FIG. 54( b ), the four clamping mechanism protrusions 551 are arranged at positions that divide the circumference into four equal parts, that is, they are respectively disposed at positions that divide the circumference every 90 degrees. The height (h1) difference (flatness) of each clamping mechanism protrusion 551 is formed within a range of 40 μm. When the height difference (flatness) of the concavities and convexities on the disk placement surface of the turntable 521 is much smaller than 40 μm (the flatness in the clamp protrusions 551), four clamp protrusions 551 and the turntable 521 can reliably The disc 501 is clamped.

如上所述，用4个夹紧机构突起551和转台521夹住盘片501的情况下，前述图47所示的盘片501的“6等分模式”的振动可减小到基本上检测不出的状态。如果在用120度分割的位置用3个夹紧机构突起和转台521夹住盘片501，则会增大盘片501的夹紧区511中的可能变形的范围，变成易急剧发生“6等分模式”振动的状态。As described above, when the disc 501 is clamped by the four clamping mechanism protrusions 551 and the turntable 521, the vibration of the "sixth mode" of the disc 501 shown in FIG. 47 can be reduced to substantially undetectable. out state. If the disc 501 is clamped with three clamping mechanism protrusions and the turntable 521 at a position divided by 120 degrees, the range of possible deformation in the clamping area 511 of the disc 501 will be increased, and it becomes easy to rapidly occur "6 etc. Mode" vibration state.

通常，大批量生产加工夹紧机构541时，采用树脂的注射模塑成形品。此时，若取盘片501的夹紧区511的半径为离中心约15mm，则夹紧机构541的盘片压紧面547中的平面度变成100μm左右。由于表面上看夹紧机构541的盘片压紧面547是平滑的，故会误解为用转台521和夹紧机构541完全平面夹住盘片501。但是，成型时产生变形的夹紧机构541，在盘片压紧面547会产生凹凸，如对已有技术描述的那样，使得必然在3处压紧盘片501。如图50所示，这3处最好是不要配置成分别具有每隔120度分割的均等间隔。其理由是，如果在盘片501与转台521之间即使存在一个120度以上的非固定区间，则图47所示的“6等分模式”的振动会在盘片501部分地发生，盘片驱动装置的振动及噪声会加剧。Usually, when the clamp mechanism 541 is mass-produced, an injection molded product of resin is used. At this time, if the radius of the clamping area 511 of the disc 501 is about 15 mm from the center, the flatness of the disc pressing surface 547 of the clamping mechanism 541 becomes about 100 μm. Since the disk pressing surface 547 of the clamping mechanism 541 is smooth on the surface, it may be misunderstood that the disk 501 is completely clamped by the turntable 521 and the clamping mechanism 541 . However, the clamping mechanism 541 that is deformed during molding has irregularities on the disk pressing surface 547, as described in the prior art, so that the disk 501 must be pressed at three places. As shown in FIG. 50, it is preferable not to arrange these three places at equal intervals divided by 120 degrees. The reason is that if there is even a non-fixed interval of 120 degrees or more between the disk 501 and the turntable 521, the vibration of the "sixth mode" shown in FIG. 47 will partially occur on the disk 501, and the disk The vibration and noise of the drive will increase.

上述压紧盘片501的3处变得配置成非常不均匀，如1个区间为180度以上的间隔，且在盘片501与转台521间不固定，则在盘片501会部分地发生图46所示的“4等分模式”的振动。The above-mentioned three places of the pressing disk 501 are arranged very unevenly. If one interval is more than 180 degrees apart, and the space between the disk 501 and the turntable 521 is not fixed, then the disk 501 will partially generate a map. 46 shows the "quadrate mode" of vibration.

图55是表示第14实施例盘片驱动装置中夹紧机构541的另一具体例的侧剖面图(a)和底面图(b)。Fig. 55 is a side sectional view (a) and a bottom view (b) showing another specific example of the clamp mechanism 541 in the disk drive device of the fourteenth embodiment.

在图55中，在构成夹紧机构541底面的盘片夹套542形成有6个圆柱形夹紧机构突起551。形成夹紧机构突起551的位置在以磁铁支座543中心突起546的中心轴为中心的圆上，处在夹紧机构突起551能可靠压紧盘片501的夹紧区511的位置。如图55(b)所示，6个夹紧机构突起551设置在同一圆周6等分的位置，即分别设置在每隔60度分割圆周的位置。In FIG. 55, six cylindrical clamp protrusions 551 are formed on the disc cartridge 542 constituting the bottom surface of the clamp 541. In FIG. The position where the clamping mechanism protrusion 551 is formed is on a circle centered on the central axis of the central protrusion 546 of the magnet support 543 , at a position where the clamping mechanism protrusion 551 can reliably press the clamping area 511 of the disc 501 . As shown in FIG. 55( b ), the six clamping mechanism protrusions 551 are arranged at 6 equally divided positions of the same circle, that is, respectively arranged at positions where the circle is divided every 60 degrees.

各夹紧机构突起551的高度(h1)差(平面度)在40μm范围内。转台521的盘片放置面中的凹凸高度差(平面度)比夹紧机构突起551中平面度小得多的情况下，利用6处夹紧机构突起551能可靠地将盘片501固定在转台521上。The height (h1) difference (flatness) of each clamping mechanism protrusion 551 is within 40 μm. In the case where the height difference (flatness) of the unevenness (flatness) of the disc placement surface of the turntable 521 is much smaller than that of the clamp protrusions 551, the disc 501 can be securely fixed on the turntable by the six clamp protrusions 551 521 on.

这样一来，通过用6处夹紧机构突起551将盘片501固定在转台521，与4个夹紧机构突起551的情况相比，能进一步减小盘片501的振动。In this way, by fixing the disk 501 to the turntable 521 with six clamp protrusions 551 , the vibration of the disk 501 can be further reduced compared to the case of four clamp protrusions 551 .

夹紧机构突起551为4个的情况，由于在各间隔为90度的4处压紧盘片501，故盘片501可变形的区间为90度。由此，盘片501变成易急剧发生如图48所示的“8等分模式”振动的状况。但是，在夹紧机构突起551为6个的情况下，盘片501的夹紧区511中可变形的区间变成60度。由此，盘片501的“8等分模式”振动减小到基本上检测不到的状态。In the case of four clamping mechanism protrusions 551, since the disc 501 is pressed at four positions at intervals of 90 degrees, the deformable section of the disc 501 is 90 degrees. As a result, the disk 501 is likely to rapidly vibrate in the "eighth mode" as shown in FIG. 48 . However, when the number of clamping mechanism protrusions 551 is six, the deformable section in the clamping area 511 of the disk 501 becomes 60 degrees. As a result, the "eighth mode" vibration of the disk 501 is reduced to a substantially undetectable state.

图56是表示第14实施例盘片驱动装置中夹紧机构541的另一具体例的侧剖面图(a)和底视图(b)。Fig. 56 is a side sectional view (a) and a bottom view (b) showing another specific example of the clamp mechanism 541 in the disk drive device of the fourteenth embodiment.

在图56中，在构成夹紧机构541底面的盘片夹套542形成9个圆柱形的夹紧机构突起551。形成夹紧机构突起551的位置在以磁铁支座543中心突起546的中心轴为中心的圆上，该位置就是夹紧机构突起551能可靠压紧盘片501的夹紧区511的位置。如图56(b)所示，9个夹紧机构突起551设置在同一圆周9等分的位置，即分别设置在每隔40度分割圆周的位置。In FIG. 56, nine cylindrical clamp protrusions 551 are formed on the disc cartridge 542 constituting the bottom surface of the clamp 541. In FIG. The position where the clamping mechanism protrusion 551 is formed is on a circle centered on the central axis of the central protrusion 546 of the magnet support 543 , and this position is the position where the clamping mechanism protrusion 551 can reliably press the clamping area 511 of the disc 501 . As shown in FIG. 56( b ), the nine clamping mechanism protrusions 551 are arranged at 9 equally divided positions on the same circle, that is, respectively arranged at positions where the circle is divided every 40 degrees.

各夹紧机构突起551的高度(h1)差(平面度)在40μm范围内。转台521的盘片放置面中的凹凸高度差(平面度)比夹紧机构突起551中平面度小得多的情况下，利用9处夹紧机构突起551能可靠地将盘片501夹紧在转台521上。The height (h1) difference (flatness) of each clamping mechanism protrusion 551 is within 40 μm. When the unevenness (flatness) of the disk placement surface of the turntable 521 is much smaller than the flatness of the clamping mechanism protrusions 551, the disc 501 can be reliably clamped by the nine clamping mechanism protrusions 551. On turntable 521.

这样一来，通过用9处夹紧机构突起551将盘片501固定在转台521，与6个夹紧机构突起551的情况相比，能进一步减小盘片501的振动。这是因为，能进一步减小盘片501振动的高阶振动模式。In this way, by fixing the disk 501 to the turntable 521 with nine clamp protrusions 551 , the vibration of the disk 501 can be further reduced compared to the case of six clamp protrusions 551 . This is because the higher-order vibration modes in which the disk 501 vibrates can be further reduced.

在因盘片夹套542成形不良使夹紧机构突起551哪怕缺掉一个的情况下，例如，夹紧机构突起551为6个时，盘片501的夹紧区511中可变形范围的区间从60度扩大到120度。此时，如前所述，就发生“6等分模式”的盘片501的振动。然而，假如夹紧机构突起551为9个，则即使在因盘片夹套542成形不良使夹紧机构突起551缺了一个的情况下，盘片501的夹紧区511中可变形范围的区间只不过变成80度。由此，与夹紧机构突起551为6个的情况一样，盘片501中“8等分模式”的振动能减小到大致检测不出的状态。In the case where even one clamping mechanism protrusion 551 is missing due to a bad shape of the disc jacket 542, for example, when there are six clamping mechanism protrusions 551, the deformable range of the clamping area 511 of the disc 501 ranges from 60 degrees expanded to 120 degrees. At this time, as described above, the vibration of the disk 501 in the "sixth mode" occurs. However, if there are nine clamping mechanism protrusions 551, even if one of the clamping mechanism protrusions 551 is missing due to a bad shape of the disc jacket 542, the deformable range in the clamping area 511 of the disc 501 It's just 80 degrees. Thus, similar to the case where there are six clamping mechanism protrusions 551, the vibration in the "eighth mode" of the disk 501 can be reduced to a state where it is almost undetectable.

在已往的盘片驱动装置中，在夹紧机构的盘片压紧面没有夹紧机构突起的情况下，将盘片501放置于转台上时，附着于夹紧区511的微小灰尘或污垢等异物会夹在盘片501与夹紧机构之间，会出现夹紧机构实质上以倾斜状态固定盘片501的情况。在这样的情况下，在盘片501的夹紧区511中由夹紧机构和转台没有夹紧的可变形范围的区间增大，盘片501按“4等分模式”、“6等分模式”及“8等分模式”振动的可能性变大。In the conventional disk drive device, when the disk 501 is placed on the turntable when the disk pressing surface of the clamping mechanism has no clamping mechanism protrusions, fine dust or dirt adhering to the clamping area 511 will be eliminated. Foreign matter may be caught between the disk 501 and the clamping mechanism, and the clamping mechanism may substantially fix the disk 501 in an inclined state. In this case, in the clamping area 511 of the disc 501, the interval of the deformable range that is not clamped by the clamping mechanism and the turntable increases, and the disc 501 is divided into "4 equal division mode" and "6 equal division mode". ” and “eighth mode” are more likely to vibrate.

但是，在本发明第14实施例的盘片驱动装置中，如果取夹紧机构突起551的直径为φ1～φ2mm左右，则由于能充分固定盘片501，故附着于夹紧区511的微小灰尘或垃圾等与夹紧机构突起551压紧盘片501的地方重合的可能性很小，从而难以受灰尘或垃圾等的影响。However, in the disc drive device according to the fourteenth embodiment of the present invention, if the diameter of the clamping mechanism protrusion 551 is about φ1˜φ2 mm, the disc 501 can be sufficiently fixed, so the fine dust attached to the clamping area 511 There is very little possibility that the protrusion 551 of the clamping mechanism overlaps the place where the disk 501 is pressed by dust or rubbish, so that it is difficult to be affected by dust or rubbish.

倘若在夹紧机构突起551的前端即使偶然附着有灰尘的情况下，由于夹紧机构突起551前端的表面积小，故灰尘附着于盘片501一侧，当取走盘片501时，随盘片501排除灰尘的可能性也大，第14实施例的盘片驱动装置具有被动自清洁的功能。If there is dust attached to the front end of the clamping mechanism protrusion 551 even by accident, since the surface area of the front end of the clamping mechanism protrusion 551 is small, the dust adheres to the disk 501 side. 501 is more likely to remove dust, and the disk drive device of the fourteenth embodiment has a passive self-cleaning function.

由于各夹紧机构突起551具有一定的高度(例如100μm)，若附着于盘片夹套542底面或与其靠紧的盘片501夹紧区511表面的灰尘等异物的高度小于夹紧机构突起551的高度(h1)，就具有防止所述异物导致盘片保持不稳定的效果。Since each clamping mechanism protrusion 551 has a certain height (for example, 100 μm), if the height of foreign matter such as dust attached to the bottom surface of the disc jacket 542 or the surface of the clamping area 511 of the disc 501 close to it is smaller than that of the clamping mechanism protrusion 551 The height (h1) has the effect of preventing the disc from being held unstable by the foreign matter.

图57是表示第14实施例盘片驱动装置中夹紧机构突起551的形状图。图57中(a)为表示圆柱形夹紧机构突起551形状的侧剖面图。为了进一步提高上述效果，若如图57(b)、(c)、及(d)所示使夹紧机构突起551的前端变小，则可减小夹紧机构突起551前端的表面积，进一步减小灰尘附着的几率。Fig. 57 is a view showing the shape of a clamping mechanism protrusion 551 in the disk drive device of the fourteenth embodiment. (a) of FIG. 57 is a side sectional view showing the shape of the cylindrical clamp mechanism protrusion 551 . In order to further improve the above-mentioned effect, if the front end of the clamping mechanism protrusion 551 is reduced as shown in Figure 57 (b), (c) and (d), the surface area of the clamping mechanism protrusion 551 front end can be reduced, further reducing The probability of small dust adhesion.

图58是表示第14实施例盘片驱动装置中夹紧机构541另一具体例的底面图。图58所示夹紧机构541的多个夹紧机构突起551配置的中心角不均等，例如，图58(a)所示的夹紧机构541是6个夹紧机构突起551配置不均匀的情况。按照图58(a)所示，如果相邻夹紧机构突起551间的最大角度θ1’在90度以下，则盘片501不会发生“8等分模式”的振动。Fig. 58 is a bottom view showing another specific example of the clamp mechanism 541 in the disk drive device of the fourteenth embodiment. The central angles of a plurality of clamping mechanism protrusions 551 of the clamping mechanism 541 shown in Figure 58 are not uniform, for example, the clamping mechanism 541 shown in Figure 58 (a) is the case where six clamping mechanism protrusions 551 are not uniformly configured . As shown in Fig. 58(a), if the maximum angle θ1' between adjacent clamping mechanism protrusions 551 is less than 90 degrees, the disk 501 will not vibrate in the "eight equal division mode".

图58(b)所示夹紧机构541是9个夹紧机构突起551配置的中心角不均匀的情况。倘若相邻的夹紧机构突起551间的最大角度θ2’在120度以上，则盘片501会发生“6等分模式”的振动。虽然完全不必将夹紧机构突起551设置成不均匀，但在注射模塑成形夹紧机构541的情形下，用于注射模塑成形的针状浇注口和夹紧机构突起551的位置发生冲突时，最好沿用上述考虑将夹紧机构突起551的位置挪到最佳位置。这样，能获得与均匀配置夹紧机构突起551情况大致相同的效果。The clamping mechanism 541 shown in FIG. 58( b ) is a case where the center angles of the nine clamping mechanism protrusions 551 are not uniform. If the maximum angle θ2' between adjacent clamping mechanism protrusions 551 is above 120 degrees, the disk 501 will vibrate in a "sixth mode". Although it is absolutely unnecessary to dispose the clamping mechanism protrusion 551 unevenly, in the case of injection molding the clamping mechanism 541, when the positions of the needle-shaped gate for injection molding and the clamping mechanism protrusion 551 collide , preferably follow the above considerations to move the position of the clamping mechanism protrusion 551 to an optimal position. In this way, substantially the same effect as in the case of uniformly arranging the clamping mechanism protrusions 551 can be obtained.

第14实施例的盘片驱动装置中，是将夹紧机构突起551配置在圆周上，但如果能配置在夹紧机构突起551能可靠压紧盘片501的夹紧区511的位置上，即使离固定于磁铁支座543中心的中心突起546的半径多少变化时，在减小盘片501振动的效果上不会有多大的变化。In the disk drive device of the fourteenth embodiment, the clamping mechanism protrusion 551 is disposed on the circumference, but if it can be disposed at a position where the clamping mechanism protrusion 551 can reliably press the clamping area 511 of the disc 501, even When the radius of the central protrusion 546 fixed to the center of the magnet support 543 varies, the effect of reducing the vibration of the disc 501 will not change much.

在第14实施例的盘片驱动装置中，各夹紧机构突起551的高度(h1)差(平面度)若在40μm范围内，则夹紧机构551能可靠地夹紧盘片501的夹紧区511。最好是，如果夹紧机构突起551的平面度在20μ范围内，则盘片501可更可靠地被夹紧在夹紧机构541与转台521之间，能进一步减小盘片501高速旋转时的振动。In the disc drive device of the fourteenth embodiment, if the height (h1) difference (flatness) of each clamping mechanism protrusion 551 is within the range of 40 μm, the clamping mechanism 551 can reliably clamp the disc 501. District 511. Preferably, if the flatness of the clamping mechanism protrusion 551 is in the range of 20 μ, then the disk 501 can be clamped between the clamping mechanism 541 and the turntable 521 more reliably, which can further reduce the time when the disk 501 rotates at a high speed. vibration.

在已往的盘片驱动装置中，夹紧机构的盘片压紧面547做成平面。因此，即便是想要修正金属模使得盘片压紧面547中凹凸的高度差在40μm范围内，也不是削除凸部，而是通过磨削其它部分使与凸部的高度一致来确保平面度。在此，要对盘片压紧面547的整个面再次磨削，若考虑磨削用工具的刀尖移动，要想通过金属模的磨削将平面度取在40μm内是非常困难的。此外，若考虑成形条件的变动、成形后的热膨胀等，则要想仅用金属模将夹紧机构的盘片压紧面547的平面度成形加工在40μm范围内，事实上是不可能的。In the conventional disk drive device, the disk pressing surface 547 of the clamp mechanism is made flat. Therefore, even if it is intended to correct the metal mold so that the height difference of the concavities and convexities on the disc pressing surface 547 is within the range of 40 μm, the flatness is ensured by grinding other parts to match the heights of the convex parts instead of cutting off the convex parts. . Here, the entire surface of the disc pressing surface 547 is to be ground again. Considering the movement of the cutting edge of the grinding tool, it is very difficult to achieve a flatness within 40 μm by grinding the die. In addition, considering variations in molding conditions, thermal expansion after molding, etc., it is practically impossible to shape the flatness of the disc pressing surface 547 of the clamping mechanism within 40 μm using only a die.

与此相反，第14实施例的盘片驱动装置，即便点数多少多了些，也很容易确保各夹紧机构突起551的高度(h1)的差(平面度)在40μm范围内。这是因为，分别测定夹紧机构突起551的高度(h1)，将夹紧机构突起551的高度(h1)按照高的顺序选择3个夹紧机构突起551，然后，由这3个夹紧机构突起551形成平面，将其余夹紧机构突起551的高度(h1)与该平面对齐，这样只要改变金属模就足够了。在平面情况下成为问题的成形条件变化、成形后的热膨胀引起的变形范围大体上可以估计到。由此，夹紧机构突起551还可以配置在变形范围外影响较小的地方。On the contrary, in the disk drive device of the fourteenth embodiment, even if the number of dots is somewhat larger, it is easy to ensure that the difference (flatness) of the height (h1) of each clamping mechanism protrusion 551 is within the range of 40 μm. This is because the height (h1) of the clamping mechanism protrusion 551 is measured respectively, and three clamping mechanism protrusions 551 are selected according to the height (h1) of the clamping mechanism protrusion 551 in order of height, and then the three clamping mechanism The protrusion 551 forms a plane with which the height (h1) of the remaining clamping mechanism protrusion 551 is aligned, so that it is sufficient to just change the die. In the case of a flat surface, the change in molding conditions and the range of deformation caused by thermal expansion after molding can be roughly estimated. Therefore, the clamping mechanism protrusion 551 can also be arranged in a place outside the deformation range where the influence is small.

在第14实施例的驱动装置中，依次说明了夹紧机构突起551数目为4个、6个、9个的情况。但是，本发明的盘片驱动装置并不限定夹紧机构突起551的数目为4个、6个、9个，即使是5个、7个、8个、或10个以上，对减小盘片501振动的效果也毫无问题。对于将盘片501夹紧在转台521与夹紧机构541之间而言，夹紧机构突起551的数目越多，意味着盘片501的可变形范围越受限制，因而减小盘片501振动的效果越好。但是，对于确保平面度用的金属模加工精度的管理，以及最佳夹紧机构突起551的数目，可以认为自然由盘片驱动装置的计划台数及成本来决定。In the driving device of the fourteenth embodiment, the cases where the number of clamping mechanism protrusions 551 are four, six, and nine are sequentially described. However, the disk drive device of the present invention does not limit the number of clamping mechanism protrusions 551 to 4, 6, or 9, even if it is 5, 7, 8, or more than 10, it is necessary to reduce the number of disks. The effect of the 501 vibration is also no problem. For clamping the disc 501 between the turntable 521 and the clamping mechanism 541, the more the clamping mechanism protrusions 551, the more limited the deformable range of the disc 501, thus reducing the vibration of the disc 501 The better the effect. However, the management of mold processing accuracy for ensuring flatness and the number of optimum clamping protrusions 551 can be considered to be naturally determined by the planned number and cost of disk drives.

第14实施例的盘片驱动装置中，以夹紧机构突起551的形状为圆柱或前端变小的水平剖面形状为圆形的突起说明了实施例。但是，本发明的盘片驱动装置，其夹紧机构突起551的水平剖面形状未必是圆形，可设定为三角形、四边形、椭圆形等自由剖面形状。但是若考虑金属模的加工，则圆柱形最简单，有利于改变夹紧机构突起551的高度(h1)。In the disk drive device of the fourteenth embodiment, the chuck mechanism protrusion 551 has been described as a cylindrical shape or a circular protrusion with a tapered horizontal cross-section. However, in the disc drive device of the present invention, the horizontal cross-sectional shape of the clamping mechanism protrusion 551 is not necessarily a circle, but can be set to a free cross-sectional shape such as a triangle, a quadrangle, or an ellipse. However, if the processing of the metal mold is considered, the cylindrical shape is the simplest, and it is beneficial to change the height (h1) of the clamping mechanism protrusion 551 .

第14实施例的盘片驱动装置中，夹紧机构突起551的高度(h1)是自由的。但是，要使形状是树脂注射模塑成形时不受变形影响的形状，则夹紧机构突起511的高度(h1)最好设定为其粗细的1/10～1/20左右。例如，若设夹紧机构突起551的直径为φ2mm，按1/20算高度为100μm，若设直径为φ1mm，按1/10算高度为100μm。若是这样的高度，则用夹紧机构突起551可足以避免毛发粗细大小的异物导致夹紧时的异常现象。In the disk drive device of the fourteenth embodiment, the height (h1) of the clamping protrusion 551 is free. However, the height (h1) of the clamping protrusion 511 is preferably set to about 1/10 to 1/20 of its thickness in order to have a shape that is not affected by deformation during resin injection molding. For example, if the diameter of the clamping mechanism protrusion 551 is φ2 mm, the height is 100 μm calculated by 1/20; if the diameter is φ1 mm, the height is 100 μm calculated by 1/10. If such a height is used, then the protrusion 551 of the clamping mechanism can be enough to avoid abnormal phenomena during clamping caused by foreign matter of the size of hair.

第14实施例盘片驱动装置，在结构上，是夹紧机构541内含有磁铁544和后磁轭545，对置磁轭524埋设在转台521的轴套522中。但是，本发明的盘片驱动装置结构上，即使转台521的轴套522内含有磁铁544和后磁轭545，夹紧机构541内含有对置磁轭524，也一定有减小盘片501高速旋转时振动的效果。The structure of the fourteenth embodiment of the disk driving device is that the clamping mechanism 541 contains a magnet 544 and a rear yoke 545 , and the opposing yoke 524 is embedded in the sleeve 522 of the turntable 521 . However, in the structure of the disk drive device of the present invention, even if the sleeve 522 of the turntable 521 contains the magnet 544 and the rear yoke 545, and the clamping mechanism 541 contains the opposite yoke 524, there must be a reduction in the speed of the disk 501. The effect of vibration when rotating.

如上所述，按照第14实施例盘片驱动装置的结构，4个以上的夹紧机构突起511配置在夹紧机构541的盘片压紧面，故能可靠减小盘片501的振动。由此，第14实施例盘片驱动装置，在将盘片501放置在有振摆的转台521上并高速旋转情况下，或在盘片501有振摆并导致严重失去平衡的盘片501高速旋转的情况下，也能减小盘片501的振动。因此，能不降低数据的传送速率进行稳定的记录重放。按照第14实施例的盘片驱动装置，也能减小对盘片驱动装置外部造成的振动及噪声，在此基础上，能实现延长主轴电动机502寿命的盘片驱动装置。As described above, according to the structure of the disk drive apparatus of the fourteenth embodiment, four or more clamping mechanism protrusions 511 are arranged on the disk pressing surface of the clamping mechanism 541, so the vibration of the disk 501 can be reliably reduced. Therefore, in the disk drive device of the fourteenth embodiment, when the disk 501 is placed on the turntable 521 with vibration and rotates at high speed, or the disk 501 with vibration of the disk 501 causes serious loss of balance, the disk 501 rotates at high speed. In the case of rotation, the vibration of the disk 501 can also be reduced. Therefore, stable recording and reproduction can be performed without reducing the data transfer rate. According to the disk drive device of the fourteenth embodiment, vibration and noise to the outside of the disk drive device can also be reduced, and on this basis, a disk drive device that prolongs the life of the spindle motor 502 can be realized.

《第15实施例》"The Fifteenth Embodiment"

下面，参照附图59说明本发明第15实施例的盘片驱动装置。Next, referring to Fig. 59, a disk drive device according to a fifteenth embodiment of the present invention will be described.

图59是表示本发明第15实施例盘片驱动装置中夹紧机构541附近的侧剖面图(a)和该夹紧机构541的底视图(b)。在图59(b)的夹紧机构541的底视图中用剖面线图示形成在转台212上的转台突起552的位置。在第15实施例中，对与前述图52～图58所示第14实施例盘片驱动装置中构件具有实质上相同功能、结构的构件，赋以相同的标号，引用先前实施例的说明，并省略重复的说明。Fig. 59 is a side sectional view (a) showing the vicinity of the clamp mechanism 541 and a bottom view (b) of the clamp mechanism 541 in the disk drive apparatus according to the fifteenth embodiment of the present invention. The position of the turntable protrusion 552 formed on the turntable 212 is shown by hatching in the bottom view of the clamp mechanism 541 in FIG. 59( b ). In the fifteenth embodiment, the components having substantially the same functions and structures as those in the disk drive device of the fourteenth embodiment shown in FIGS. and omit repeated descriptions.

如图59(a)所示，放置盘片501的转台212固定于主轴电动机的轴528上，可旋转支持着盘片501的夹紧区511。与盘片501的夹紧孔512配合的轴套522与转台212形成一体。利用盘片501与轴套522的配合对盘片501定位。在轴套522与夹紧机构541相对的面的中央形成定位孔523，环状的对置磁轭524埋设固定于轴套522中。As shown in FIG. 59( a ), the turntable 212 on which the disc 501 is placed is fixed on the shaft 528 of the spindle motor, and rotatably supports the clamping area 511 of the disc 501 . A shaft sleeve 522 that fits with the clamping hole 512 of the disc 501 is integrally formed with the turntable 212 . The disk 501 is positioned by the cooperation of the disk 501 and the sleeve 522 . A positioning hole 523 is formed in the center of the surface of the shaft sleeve 522 opposite to the clamping mechanism 541 , and the ring-shaped opposing magnetic yoke 524 is buried and fixed in the shaft sleeve 522 .

如图59(a)所示，树脂制的夹紧机构541具有与安装的盘片501的上面相对的盘片夹套542和磁铁支座543。盘片夹套542的底面形成平坦的面。磁铁支座543固定安装有中心突起546，用以与设置在转台212的轴套522的定位孔523配合，确保转台212和夹紧机构541有相同的中心位置。在磁铁支座543内部固定有磁铁544和后磁轭545。As shown in FIG. 59(a), a clamp mechanism 541 made of resin has a disk jacket 542 and a magnet holder 543 facing the upper surface of the mounted disk 501. As shown in FIG. The bottom surface of the disk jacket 542 forms a flat surface. The magnet support 543 is fixed with a central protrusion 546 for matching with the positioning hole 523 of the sleeve 522 of the turntable 212 to ensure that the turntable 212 and the clamping mechanism 541 have the same center position. A magnet 544 and a rear yoke 545 are fixed inside the magnet support 543 .

在如上构成的第15实施例盘片驱动装置中，当盘片501夹紧在夹紧机构541与转台212之间的状态下，盘片501的夹紧孔512与转台212的轴套522配合，盘片501安装在转台212上。此时，盘片501通过作用于包含在夹紧机构541内的磁铁544与固定于轴套522的对置磁轭524之间的吸引磁力而被保持住。In the disk drive device of the fifteenth embodiment constituted as above, when the disk 501 is clamped between the clamping mechanism 541 and the turntable 212, the clamping hole 512 of the disk 501 is engaged with the bushing 522 of the turntable 212. , the disk 501 is installed on the turntable 212 . At this time, the disk 501 is held by the attractive magnetic force acting between the magnet 544 included in the clamp mechanism 541 and the opposing yoke 524 fixed to the boss 522 .

这样保持住的盘片501随主轴电动机502的旋转而与转台212及夹紧机构541作整体旋转。The disc 501 thus held rotates integrally with the turntable 212 and the clamp mechanism 541 as the spindle motor 502 rotates.

第15实施例的盘片驱动装置如图59(b)所示，在构成树脂制夹紧机构541底面的盘片夹套542形成有圆柱形的4个夹紧机构突起551。夹紧机构突起551配置在以磁铁支座543的中心突起546的中心轴为中心的圆上，形成在夹紧机构突起551确实能压紧盘片501的夹紧区511的位置。如图59(b)所示，4个夹紧机构突起551设置在同一圆中4等分的位置，也即，分别设置在每隔90度分割圆周的位置。各夹紧机构突起551的高度(h1)差(平面度)规定在40μm范围内。In the disk drive device of the fifteenth embodiment, as shown in FIG. 59(b), four cylindrical clamp protrusions 551 are formed on the disc jacket 542 constituting the bottom surface of the resin clamp 541. As shown in FIG. The clamping protrusion 551 is arranged on a circle centered on the central axis of the central protrusion 546 of the magnet holder 543 , and is formed at a position where the clamping protrusion 551 can surely press the clamping area 511 of the disc 501 . As shown in FIG. 59( b ), the four clamping mechanism protrusions 551 are arranged at positions that divide the same circle into four equal parts, that is, they are respectively arranged at positions that divide the circumference every 90 degrees. The height (h1) difference (flatness) of each clamping mechanism protrusion 551 is specified within the range of 40 μm.

如图59(a)所示，在第15实施例盘片驱动装置中树脂制的转台212的上面形成有圆柱形转台突起552。在图59(b)中，形成在转台212的转台突起552的位置用斜线表示在夹紧机构541的底面。即，在转台212，4个转台突起552形成在以主轴电动机502的定位孔523为中心的同一圆上。形成转台突起552的位置是转台突起552能可靠压紧盘片501的夹紧区511的位置。如图59(b)所示，4个转台突起552设置在同一圆中4等分的位置，也即，分别设置在每隔90度分割圆周的位置。各转台突起552的高度(h1)差(平面度)规定在40μm范围内。As shown in FIG. 59(a), a cylindrical turntable protrusion 552 is formed on the upper surface of the resin-made turntable 212 in the disk drive apparatus of the fifteenth embodiment. In FIG. 59( b ), the position of the turntable protrusion 552 formed on the turntable 212 is indicated by oblique lines on the bottom surface of the clamp mechanism 541 . That is, on the turntable 212 , four turntable projections 552 are formed on the same circle centered on the positioning hole 523 of the spindle motor 502 . The position where the turntable protrusion 552 is formed is the position where the turntable protrusion 552 can reliably press the clamping area 511 of the disk 501 . As shown in FIG. 59( b ), four turntable protrusions 552 are provided at positions that divide the same circle into four equal parts, that is, at positions that divide the circumference every 90 degrees. The height (h1) difference (flatness) of each turntable protrusion 552 is specified within the range of 40 μm.

在第15实施例中，如果各夹紧机构突起551的高度(h1)差(平面度)在40μm范围内，各转台突起552的高度(h2)差(平面度)在40μm范围内，则盘片501在其上面和下面合计8处被可靠地夹紧在夹紧机构541和转台212当中。In the fifteenth embodiment, if the height (h1) difference (flatness) of each clamping mechanism protrusion 551 is within 40 μm and the height (h2) difference (flatness) of each turntable protrusion 552 is within 40 μm, the disk The sheet 501 is securely clamped in the clamping mechanism 541 and the turntable 212 at a total of 8 places above and below it.

在第15实施例的盘片驱动装置中，一旦将盘片501放置于转台212上，则盘片501随固定主轴电动机502的底座508一起向上推向夹紧机构541。其结果，通过夹紧机构541和转台212夹紧盘片501。此时，在夹紧机构541、盘片501和转台212之间的定位，除了将它们的中心与主轴电动机528的中心对准外，不存在旋转方向位置方面的限制，可任意定位。即使在这样的情况下，夹紧机构541能防止盘片501的“6等分模式”中向上的盘片501的变形。转台212能防止盘片501的“6等分模式”中向下的盘片501的变形。In the disk driving apparatus of the fifteenth embodiment, once the disk 501 is placed on the turntable 212, the disk 501 is pushed upward toward the clamping mechanism 541 together with the base 508 on which the spindle motor 502 is fixed. As a result, the disc 501 is clamped by the clamp mechanism 541 and the turntable 212 . At this time, the positioning among the clamp mechanism 541, the disk 501 and the turntable 212, except that their centers are aligned with the center of the spindle motor 528, there is no restriction on the position in the rotational direction, and they can be positioned arbitrarily. Even in such a case, the clamping mechanism 541 can prevent deformation of the disk 501 facing upward in the "sixth mode" of the disk 501 . The turntable 212 can prevent deformation of the disk 501 facing downward in the "sixth mode" of the disk 501 .

因此，在第15实施例的盘片驱动装置中，能防止盘片501的“6等分模式”的上下方向的变形，在盘片501高速旋转情况下，能将盘片501“6等分模式”的振动减小到基本上检测不出的状态。Therefore, in the disc drive device of the fifteenth embodiment, the deformation in the up and down direction of the "six equally divided mode" of the disc 501 can be prevented, and the disc 501 can be divided into "six equal parts" when the disc 501 rotates at a high speed. mode" vibrations are reduced to an essentially undetectable state.

第15实施例的盘片驱动装置如果是能用手动方式将夹紧机构541固定于转台212以便夹紧盘片的盘片驱动装置，则通过使夹紧机构突起551和转台突起552在旋转方向的位置一致，将夹紧机构551准确地设置在转台突起552上，并将夹紧机构541与转台521固定，就能进一步减小盘片501高速旋转情况下的振动。If the disk driving device of the fifteenth embodiment is a disk driving device that can manually fix the clamping mechanism 541 to the turntable 212 so as to clamp the disk, by making the clamping mechanism protrusion 551 and the turntable protrusion 552 align in the direction of rotation The positions of the disks 501 and 521 are consistent, and the clamping mechanism 551 is accurately arranged on the protrusion 552 of the turntable, and the clamping mechanism 541 and the turntable 521 are fixed, so as to further reduce the vibration of the disk 501 when the disk 501 rotates at a high speed.

在第15实施例的盘片驱动装置中，假定各夹紧机构突起551的高度(h1)差(平面度)在40μm范围内，则用4个以上的夹紧机构突起551能可靠地夹紧盘片501的夹紧区511。最好是能使夹紧机构突起551的平面度在20μm范围内，则与转台212之间能进一步可靠地夹紧，能进一步减小盘片501高速旋转情况下的振动。In the disk drive device of the fifteenth embodiment, assuming that the height (h1) difference (flatness) of each clamping mechanism protrusion 551 is within the range of 40 μm, then four or more clamping mechanism protrusions 551 can reliably clamp The clamping area 511 of the disc 501 . Preferably, the flatness of the protrusion 551 of the clamping mechanism can be within the range of 20 μm, so that the protrusion 551 can be more reliably clamped with the turntable 212, and the vibration of the disk 501 can be further reduced when the disc 501 rotates at a high speed.

在第15实施例的盘片驱动装置中，若各转台突起552的高度(h2)差(平面度)在40μm范围内，则前面已经叙述了转台突起552能可靠地夹紧盘片501的夹紧区511。但是，最好若使转台突起552的平面度在20μm范围内，则在与夹紧机构541之间能进一步可靠地夹紧盘片501，能进一步减小盘片501高速旋转时的振动。In the disk drive device of the fifteenth embodiment, if the height (h2) difference (flatness) of each turntable protrusion 552 is within the range of 40 μm, then the clamping method that the turntable protrusions 552 can reliably clamp the disk 501 has been described above. Tight District 511. However, if the flatness of the turntable protrusion 552 is preferably within the range of 20 μm, the disk 501 can be more reliably clamped between the clamping mechanism 541 and the vibration when the disk 501 rotates at a high speed can be further reduced.

在第15实施例的盘片驱动装置中，如果夹紧机构突起551和转台突起552各自的直径为φ1～φ2mm左右，则由于能充分固定盘片501，故附着于夹紧区511中的微小灰尘或垃圾等异物的位置与夹紧机构突起551或转台突起552压紧盘片501的位置重合的可能性很小，从而难以受灰尘或垃圾等的影响。即使在夹紧机构突起551或转台突起552的前端偶然附着有灰尘的情况下，由于它们前端的表面积小，故灰尘附着于盘片501一侧，当取走盘片501时具有随盘片501一起排除灰尘、被动自清洁的功能。In the disk drive device of the fifteenth embodiment, if the respective diameters of the clamping mechanism projection 551 and the turntable projection 552 are about φ1˜φ2 mm, the disk 501 can be sufficiently fixed, so the microscopic particles in the clamping area 511 can be attached. The position of foreign matter such as dust or garbage is less likely to coincide with the position where the clamping mechanism protrusion 551 or the turntable protrusion 552 presses the disk 501, so it is difficult to be affected by dust or garbage. Even in the case where dust is accidentally attached to the front ends of the clamp mechanism protrusion 551 or the turntable protrusion 552, since their front ends have a small surface area, the dust adheres to the side of the disc 501, and when the disc 501 is taken away, there is Remove dust together, passive self-cleaning function.

为了进一步提高上述效果，若如前述图57(b)、(c)、及(d)所示使夹紧机构突起551和转台突起552的前端变小，则可减小夹紧机构突起551和转台突起552前端的表面积，进一步减小灰尘附着的几率。In order to further improve the above-mentioned effect, if the front ends of the clamping mechanism protrusion 551 and the turntable protrusion 552 are reduced as shown in the foregoing Figure 57 (b), (c) and (d), the clamping mechanism protrusion 551 and the front end of the turntable protrusion 552 can be reduced. The surface area of the front end of the turntable protrusion 552 further reduces the probability of dust adhesion.

第15实施例的盘片驱动装置中，以夹紧机构突起551和转台552的形状为圆柱形或前端变小的水平剖面形状为圆形的突起说明了实施例。但是，本发明中夹紧机构突起551和转台突起552的水平剖面形状未必要圆形，可设定为三角形、四边形、椭圆形等自由剖面形状。In the disk drive device of the fifteenth embodiment, the clamping mechanism protrusion 551 and the turntable 552 are described as cylindrical or circular in horizontal cross-sectional shape with a tapered front end. However, in the present invention, the horizontal cross-sectional shape of the clamping mechanism protrusion 551 and the turntable protrusion 552 is not necessarily circular, and can be set to a free cross-sectional shape such as a triangle, a quadrangle, or an ellipse.

但是若考虑金属模的加工，则圆柱形最简单，有利于改变夹紧机构突起551或转台突起552的高度(h2)。However, if the processing of the metal mold is considered, the cylindrical shape is the simplest, and it is beneficial to change the height (h2) of the clamping mechanism protrusion 551 or the turntable protrusion 552.

在第15实施例的盘片驱动装置中，取夹紧机构突起551和转台突起552的个数分别为4个进行了说明。但是，本发明与前述第14实施例的盘片驱动装置情况相同，若构成6个、9个或9个以上，则相应能更进一步减小盘片501高速旋转时的振动。In the disk drive device of the fifteenth embodiment, the number of clamping mechanism protrusions 551 and the number of turntable protrusions 552 are respectively four. However, the present invention is the same as the disk drive device of the aforementioned fourteenth embodiment. If there are 6, 9 or more disk drives, the vibration when the disk 501 rotates at a high speed can be further reduced accordingly.

在第15实施例的盘片驱动装置中，取夹紧机构突起551和转台突起552的个数相同分别为4个进行了说明。但是，夹紧机构突起551和转台突起552未必要相同的个数，即使是个数各不相同，也能取得盘片501高速旋转时减小振动的效果。In the disk drive device of the fifteenth embodiment, the number of the clamping mechanism protrusions 551 and the turntable protrusions 552 are the same as the number of four, respectively. However, the number of clamping mechanism protrusions 551 and turntable protrusions 552 is not necessarily the same, and even if the numbers are different, the effect of reducing vibration when the disk 501 rotates at a high speed can be obtained.

第15实施例的盘片驱动装置，是以树脂制的转台212进行了说明，但即使将树脂制的转台突起一体成形在金属制的转台(外部成形)也能获得同样的效果。The disk drive device of the fifteenth embodiment has been described using the resin turntable 212, but the same effect can be obtained even if the resin turntable projections are integrally molded on the metal turntable (external molding).

第15实施例构成的盘片驱动装置，其夹紧机构541内含有磁铁544和后磁轭545，对置磁轭524内含在转台212的轴套522中。但是若这样构成，即使转台212的轴套522内含有磁铁544和后磁轭545，夹紧机构541内含有对置磁轭524，也一定具有减小盘片501高速旋转时振动的效果。由于各转台突起552具有一定的高度(例如100μm)，若附着于转台212的盘片放置面或与其靠紧的盘片501夹紧区511表面的灰尘等异物的高度小于转台突起552的高度(h2)，就具有防止所述异物导致盘片保持不稳定的效果。In the disk drive device according to the fifteenth embodiment, the clamping mechanism 541 includes a magnet 544 and a rear yoke 545 , and the opposing yoke 524 is included in the sleeve 522 of the turntable 212 . However, if constituted in this way, even if the sleeve 522 of the turntable 212 contains the magnet 544 and the rear yoke 545, and the clamping mechanism 541 contains the opposite yoke 524, it will definitely have the effect of reducing the vibration of the disk 501 when it rotates at high speed. Since each turntable protrusion 552 has a certain height (for example, 100 μm), if the height of foreign matter such as dust attached to the disc placement surface of the turntable 212 or the surface of the clamping area 511 of the disc 501 close to it is smaller than the height of the turntable protrusion 552 ( h2), it has the effect of preventing the foreign matter from causing the disk to remain unstable.

如上所述，按照第15实施例的盘片驱动装置，由于夹紧机构541的盘片压紧面上配置4个以上的夹紧机构突起551，转台212的盘片放置面上配置4个以上的转台突起552，故能可靠减小盘片501的振动。因此，第15实施例的盘片驱动装置，在将盘片501放置在有振摆的转台212上并高速旋转情况下，或在盘片501有振摆并导致严重失去平衡的盘片501高速旋转的情况下，也能减小盘片501的振动。其结果，按照第15实施例的盘片驱动装置，能不降低数据的传送速率进行稳定的记录重放。按照第15实施例，也能减小对盘片驱动装置外部造成的振动或噪声，同时能实现延长主轴电动机502寿命的盘片驱动装置。As described above, according to the disk drive device of the fifteenth embodiment, since four or more clamp mechanism projections 551 are arranged on the disk pressing surface of the clamp mechanism 541, four or more clamp mechanism projections 551 are arranged on the disk placement surface of the turntable 212. The turntable protrusion 552 can reliably reduce the vibration of the disk 501. Therefore, in the disk drive device of the fifteenth embodiment, when the disk 501 is placed on the turntable 212 with wobble and rotates at a high speed, or when the disk 501 has wobble and causes serious loss of balance, the disk 501 rotates at a high speed. In the case of rotation, the vibration of the disk 501 can also be reduced. As a result, according to the disk drive device of the fifteenth embodiment, stable recording and reproduction can be performed without reducing the data transfer rate. According to the fifteenth embodiment, it is also possible to reduce vibration and noise to the outside of the disk drive device and to realize a disk drive device that prolongs the life of the spindle motor 502 .

《第16实施例》"The 16th embodiment"

下面，参照附图60和图61说明本发明第16实施例的盘片驱动装置。Next, a disk drive device according to a sixteenth embodiment of the present invention will be described with reference to FIGS. 60 and 61. FIG.

图60是表示本发明第16实施例盘片驱动装置中夹紧机构413附近的侧剖面图(a)和该夹紧机构413的底视图(b)。在图60(b)的夹紧机构413的底视图中用斜线图示形成在转台213上的转台突起552的位置，夹紧机构突起551和转台突起552在与主轴电动机轴平行的方向形成的位置相同。图61是表示第16实施例盘片驱动装置中位置对准机构的立体图。图61中，(a)为将夹紧机构413的底面向上表示的立体图，(b)为表示转台213的立体图。60 is a side sectional view (a) showing the vicinity of the clamp mechanism 413 and a bottom view (b) of the clamp mechanism 413 in the disk drive apparatus according to the sixteenth embodiment of the present invention. In the bottom view of the clamping mechanism 413 in FIG. 60( b ), the position of the turntable protrusion 552 formed on the turntable 213 is shown with oblique lines, and the clamping mechanism protrusion 551 and the turntable protrusion 552 are formed in a direction parallel to the spindle motor shaft. in the same position. Fig. 61 is a perspective view showing the alignment mechanism in the disk drive device of the sixteenth embodiment. In FIG. 61 , (a) is a perspective view showing the bottom surface of the clamp mechanism 413 upward, and (b) is a perspective view showing the turntable 213 .

在第16实施例中，对与前述图52～图59所示第14实施例及第15实施例的盘片驱动装置中的构件具有实质上相同功能、结构的构件，赋以相同的标号，引用先前实施例的说明，并省略重复的说明。In the sixteenth embodiment, the components having substantially the same functions and structures as those in the disk drive apparatuses of the fourteenth embodiment and the fifteenth embodiment shown in FIGS. 52 to 59 are given the same reference numerals, The descriptions of the previous embodiments are cited, and repeated descriptions are omitted.

如图60(a)所示，放置盘片501的转台213固定于主轴电动机的轴528上，可旋转支持着盘片501的夹紧区511。与盘片501的夹紧孔512配合的轴套522与转台213形成一体。利用盘片501与轴套522的配合对盘片501定位。在轴套522与夹紧机构413相对的面的中央形成定位孔523，环状的对置磁轭524埋设固定于轴套522中。As shown in FIG. 60( a ), the turntable 213 on which the disc 501 is placed is fixed on the shaft 528 of the spindle motor, and rotatably supports the clamping area 511 of the disc 501 . A shaft sleeve 522 that fits with the clamping hole 512 of the disc 501 is integrally formed with the turntable 213 . The disk 501 is positioned by the cooperation of the disk 501 and the sleeve 522 . A positioning hole 523 is formed in the center of the surface of the shaft sleeve 522 opposite to the clamping mechanism 413 , and the ring-shaped opposing magnetic yoke 524 is buried and fixed in the shaft sleeve 522 .

如图60(a)所示，树脂制的夹紧机构413具有与安装的盘片501的上面相对的盘片夹套542和磁铁支座543。盘片夹套542的底面形成平坦的面。磁铁支座543固定安装有中心突起546，用以与设置在转台213的轴套522的定位孔523配合，确保夹紧机构541与转台213同轴。在磁铁支座543内部固定有磁铁544和后磁轭545。As shown in FIG. 60(a), the clamp mechanism 413 made of resin has a disk jacket 542 and a magnet holder 543 facing the upper surface of the mounted disk 501. As shown in FIG. The bottom surface of the disk jacket 542 forms a flat surface. The magnet support 543 is fixedly mounted with a central protrusion 546 for cooperating with the positioning hole 523 of the sleeve 522 of the turntable 213 to ensure that the clamping mechanism 541 is coaxial with the turntable 213 . A magnet 544 and a rear yoke 545 are fixed inside the magnet support 543 .

在如上构成的第16实施例盘片驱动装置中，当盘片501夹紧在夹紧机构413与转台213之间的状态下，盘片501通过夹紧孔512与轴套522的配合，安装在转台213上。此时，盘片501通过作用于包含在夹紧机构413内的磁铁544与固定于轴套522的对置磁轭524之间的吸引磁力而被保持住。这样保持住的盘片501随主轴电动机502的旋转而与转台213及夹紧机构413作整体旋转。In the disk drive device of the sixteenth embodiment constituted as above, when the disk 501 is clamped between the clamping mechanism 413 and the turntable 213, the disk 501 is installed through the cooperation of the clamping hole 512 and the sleeve 522. On turntable 213. At this time, the disk 501 is held by the attractive magnetic force acting between the magnet 544 included in the clamp mechanism 413 and the opposing yoke 524 fixed to the boss 522 . The disc 501 thus held rotates integrally with the turntable 213 and the clamp mechanism 413 as the spindle motor 502 rotates.

在图60(b)的夹紧机构413的底面图中，一起所示的形成在转台213的转台突起552的位置与夹紧机构突起551相同。In the bottom view of the clamp mechanism 413 in FIG. 60( b ), the position of the turntable protrusion 552 formed on the turntable 213 shown together is the same as that of the clamp mechanism protrusion 551 .

第16实施例的盘片驱动装置如图60(b)所示，在构成树脂制夹紧机构413底面的盘片夹套542的底面形成有圆柱形的4个夹紧机构突起551。形成的夹紧机构突起551的位置在以磁铁支座543的中心突起546的中心轴为中心的圆上，是在夹紧机构突起551确实能压紧盘片501的夹紧区511的位置。而且，夹紧机构突起551设置在将该圆的圆周4等分的位置，也即，设置在每隔90度分割的位置。各夹紧机构突起551的高度(h1)差(平面度)规定在40μm范围内。In the disk drive device of the sixteenth embodiment, as shown in FIG. 60(b), four cylindrical clamp protrusions 551 are formed on the bottom surface of the disc jacket 542 constituting the bottom surface of the resin clamp 413. The position of the formed clamping mechanism protrusion 551 is on the circle centered on the central axis of the central protrusion 546 of the magnet holder 543, and is the position where the clamping mechanism protrusion 551 can really press the clamping area 511 of the disc 501. Also, the clamping mechanism protrusions 551 are provided at positions where the circumference of the circle is divided into four, that is, at positions divided every 90 degrees. The height (h1) difference (flatness) of each clamping mechanism protrusion 551 is specified within the range of 40 μm.

如图60(b)所示，第16实施例盘片驱动装置在树脂制的转台213的盘片放置面上形成4个圆柱形转台突起552。形成的转台突起552的位置是在以主轴电动机502的定位孔523为中心的圆上，是在转台突起552能可靠压紧盘片501的夹紧区511的位置。而且，转台突起552设置在4等分该圆的圆周的位置即每隔90度分割的位置上。各转台突起552的高度(h2)差(平面度)规定在40μm范围内。As shown in FIG. 60(b), in the disk drive apparatus of the sixteenth embodiment, four cylindrical turntable projections 552 are formed on the disk placement surface of the turntable 213 made of resin. The position of the formed turntable protrusion 552 is on the circle centered on the positioning hole 523 of the spindle motor 502 , and is the position where the turntable protrusion 552 can reliably press the clamping area 511 of the disk 501 . Further, the turntable protrusions 552 are provided at positions that divide the circumference of the circle into four equal parts, that is, positions divided every 90 degrees. The height (h2) difference (flatness) of each turntable protrusion 552 is specified within the range of 40 μm.

如上所述，若各夹紧机构突起551的高度(h1)差(平面度)在40μm范围内，各转台突起552的高度(h2)差(平面度)在40μm范围内，则盘片501在其上面和下面合计8处被可靠地夹紧在夹紧器413和转台213当中。As mentioned above, if the height (h1) difference (flatness) of each clamping mechanism protrusion 551 is within the range of 40 μm, and the height (h2) difference (flatness) of each turntable protrusion 552 is within the range of 40 μm, then the disc 501 is A total of 8 places above and below it are reliably clamped among the clamper 413 and the turntable 213 .

一旦第16实施例的盘片驱动装置将盘片501放置于转台213上，则盘片501随固定主轴电动机502的底座508一起推向夹紧机构413的方向。其结果，通过夹紧机构413和转台213夹紧盘片501。Once the disk drive device of the sixteenth embodiment places the disk 501 on the turntable 213 , the disk 501 is pushed toward the direction of the clamping mechanism 413 together with the base 508 on which the spindle motor 502 is fixed. As a result, the disc 501 is clamped by the clamp mechanism 413 and the turntable 213 .

如图61(b)所示，在第16实施例盘片驱动装置中，轴套522的上面在与转台突起552旋转方向的位置对应的角度形成有结合部522a，该结合部522a具有与转台突起552相同数目的台阶。As shown in FIG. 61(b), in the disk drive device of the sixteenth embodiment, the upper surface of the sleeve 522 is formed with a coupling portion 522a at an angle corresponding to the position of the turntable protrusion 552 in the rotation direction. The protrusions 552 have the same number of steps.

此外，如图61(a)所示，在夹紧机构413的盘片夹套542的与轴套522的结合部522a对应的位置形成具有台阶的结合部542a。在与盘片夹套542的结合部542a的旋转方向位置对应的角度设置与转台突起552相同数目的夹紧机构突起551。图61(a)的夹紧机构413为了说明方便起见，将夹紧机构413的底面朝上表示。Furthermore, as shown in FIG. 61( a ), a joint portion 542 a having a step is formed at a position corresponding to the joint portion 522 a of the hub 522 of the disc chuck 542 of the clamp mechanism 413 . The same number of clamping mechanism protrusions 551 as the turntable protrusions 552 are provided at an angle corresponding to the rotational direction position of the coupling portion 542 a of the disc chuck 542 . The clamp mechanism 413 of FIG. 61( a ) is shown with the bottom surface of the clamp mechanism 413 facing upward for convenience of description.

如上形成的轴套522结合部522a的台阶和夹紧机构413结合部542a的台阶在夹紧盘片501时相结合，夹紧机构突起551和转台突起552在旋转方向中始终为相同角度，且配置在同一圆上。由此，夹紧机构突起551和转台突起552始终在相同位置可靠地夹紧盘片501的上面和下面。其结果，第16实施例盘片驱动装置中，在盘片501高速旋转情况下，与夹紧机构突起551和转台突起552错开的情况相比，能更进一步减小盘片501中“6等分模式”的振动。The step of the coupling portion 522a of the bushing 522 and the step of the coupling portion 542a of the clamping mechanism 413 formed as above are combined when the disc 501 is clamped, the clamping mechanism protrusion 551 and the turntable protrusion 552 always have the same angle in the rotation direction, and arranged on the same circle. Thus, the clamping mechanism protrusion 551 and the turntable protrusion 552 reliably clamp the upper and lower surfaces of the disk 501 at the same position at all times. As a result, in the disc drive device of the sixteenth embodiment, when the disc 501 rotates at a high speed, the "6 etc. mode" vibration.

在第16实施例的盘片驱动装置中，假定各夹紧机构突起551的高度(h1)差(平面度)在40μm范围内，则夹紧机构突起551能可靠地夹紧盘片501的夹紧区511。最好是能使夹紧机构突起551的平面度在20μm范围内，则盘片501能更进一步可靠地夹紧在夹紧机构413与转台213之间，能进一步减小盘片501高速旋转情况下的振动。In the disk drive device of the sixteenth embodiment, assuming that the height (h1) difference (flatness) of each clamping mechanism protrusion 551 is within the range of 40 μm, the clamping mechanism protrusion 551 can reliably clamp the disk 501. Tight District 511. It is preferable to make the flatness of the clamping mechanism protrusion 551 within the range of 20 μm, then the disk 501 can be further reliably clamped between the clamping mechanism 413 and the turntable 213, and the high-speed rotation of the disk 501 can be further reduced down the vibration.

在第16实施例的盘片驱动装置中，若各转台突起552的高度(h2)差(平面度)在40μm范围内，则用4个以上的转台突起552能可靠地夹紧盘片501的夹紧区511。最好能使转台突起552的平面度在20μm范围内，则盘片501能更进一步可靠地夹紧在夹紧机构413与转台213之间，能进一步减小盘片501高速旋转时的振动。In the disc drive device of the sixteenth embodiment, if the height (h2) difference (flatness) of the turntable protrusions 552 is within the range of 40 μm, the disc 501 can be reliably clamped by four or more turntable protrusions 552. Clamping zone 511 . It is preferable to make the flatness of the turntable protrusion 552 within the range of 20 μm, then the disc 501 can be clamped between the clamping mechanism 413 and the turntable 213 more reliably, and the vibration of the disc 501 when rotating at high speed can be further reduced.

在第16实施例的盘片驱动装置中，如果夹紧机构突起551和转台突起552的直径为φ1～φ2mm左右，则由于能充分固定盘片501，故在夹紧区511中附着有微小灰尘或垃圾等异物的位置与夹紧机构突起551或转台突起552压紧盘片501的位置重合的可能性很小，从而难以受灰尘或垃圾等异物的影响。In the disc drive device of the sixteenth embodiment, if the diameters of the clamping mechanism protrusion 551 and the turntable protrusion 552 are about φ1˜φ2 mm, since the disc 501 can be sufficiently fixed, fine dust is attached to the clamping area 511. The position of the foreign matter such as dust or rubbish is less likely to coincide with the position where the clamping mechanism protrusion 551 or the turntable protrusion 552 presses the disc 501, so it is difficult to be affected by foreign matter such as dust or rubbish.

即使在夹紧机构突起551或转台突起552的前端偶然附着有灰尘的情况下，由于它们前端的表面积小，故灰尘附着于盘片501一侧，当取走盘片501时具有随盘片501一起排除灰尘、被动自清洁的功能。Even in the case where dust is accidentally attached to the front ends of the clamp mechanism protrusion 551 or the turntable protrusion 552, since their front ends have a small surface area, the dust adheres to the side of the disc 501, and when the disc 501 is taken away, there is Remove dust together, passive self-cleaning function.

第16实施例的盘片驱动装置中，以夹紧机构突起551和转台552的形状为圆柱形或前端变小的水平剖面形状为圆形突起说明了实施例。但是，本发明中夹紧机构突起551和转台突起552的水平剖面形状未必要圆形，可设定为三角形、四边形、椭圆形等自由剖面形状。In the disk drive device of the sixteenth embodiment, the chuck mechanism protrusion 551 and the turntable 552 are described as cylindrical or circular protrusions with a tapered horizontal cross-section. However, in the present invention, the horizontal cross-sectional shape of the clamping mechanism protrusion 551 and the turntable protrusion 552 is not necessarily circular, and can be set to a free cross-sectional shape such as a triangle, a quadrangle, or an ellipse.

在第16实施例的盘片驱动装置中，取夹紧机构突起551和转台突起552的个数分别为4个进行了说明。但是，本发明与前述第14实施例的盘片驱动装置情况相同，若构成6个、9个或9个以上，则相应能更进一步减小盘片501高速旋转时的振动。In the disk drive device of the sixteenth embodiment, the number of the clamping mechanism protrusions 551 and the number of the turntable protrusions 552 are respectively four. However, the present invention is the same as the disk drive device of the aforementioned fourteenth embodiment. If there are 6, 9 or more disk drives, the vibration when the disk 501 rotates at a high speed can be further reduced accordingly.

第16实施例的盘片驱动装置，是以树脂制的转台213进行了说明，但即使将树脂制的转台突起一体成形在金属制的转台(例如，外部成形)也能获得同样的效果。The disc drive device of the sixteenth embodiment has been described using the resin turntable 213, but the same effect can be obtained even if the resin turntable projections are integrally formed (eg, externally formed) on the metal turntable.

第16实施例构成的盘片驱动装置，其夹紧机构413内含有磁铁544和后磁轭545，对置磁轭524内含在转台213的轴套522中。但是若这样构成，即使转台213的轴套522内含有磁铁544和后磁轭545，夹紧机构413内含有对置磁轭524，也一定具有减小盘片501高速旋转时振动的效果。In the disc drive device according to the sixteenth embodiment, the clamping mechanism 413 includes a magnet 544 and a rear yoke 545 , and the opposing yoke 524 is included in a sleeve 522 of the turntable 213 . However, if constituted in this way, even if the sleeve 522 of the turntable 213 contains the magnet 544 and the rear yoke 545, and the clamping mechanism 413 contains the opposite yoke 524, it will definitely have the effect of reducing the vibration of the disk 501 when it rotates at high speed.

在第16实施例的盘片驱动装置中，取夹紧机构413的结合部542a和转台213的结合部522a的个数与夹紧机构突起551和转台突起552的个数相同为4个进行了说明。但是，夹紧机构413结合部542a和夹紧机构突起551及转台213的结合部522a和转台突起552的各个数目未必要相同。根据不同的夹紧机构413的结合部542a和转台213的结合部522a，如果夹紧机构突起551和转台突起552的位置至少有4个以上一致，则即便夹紧机构突起551或转台突起552某一方有多余的突起，也能取得盘片501高速旋转时减小振动的效果。In the disk drive device of the sixteenth embodiment, the number of joint portions 542a of the clamp mechanism 413 and the joint portions 522a of the turntable 213 is the same as the number of clamp mechanism protrusions 551 and the number of turntable protrusions 552 to be four. illustrate. However, the respective numbers of the joint portion 542a of the clamping mechanism 413 and the protrusion 551 of the clamping mechanism and the joint portion 522a of the turntable 213 and the protrusion 552 of the turntable are not necessarily the same. Depending on the joint portion 542a of the clamping mechanism 413 and the joint portion 522a of the turntable 213, if at least four of the clamping mechanism protrusions 551 and the positions of the turntable protrusions 552 are consistent, even if the clamping mechanism protrusions 551 or the turntable protrusions 552 One side has redundant protrusions, which can also achieve the effect of reducing vibration when the disk 501 rotates at a high speed.

如上所述，按照第16实施例的盘片驱动装置的结构，由于夹紧机构413的盘片压紧面上配置4个以上的夹紧机构突起551，转台213的盘片放置面上配置4个以上的转台突起552，同时夹紧机构突起551和转台突起552实际上在相同的位置夹紧盘片501的上面和下面，故能可靠减小盘片501的振动。由此，第16实施例的盘片驱动装置，在将盘片501放置在有振摆的转台213上并高速旋转情况下，或在盘片501有振摆并导致严重失去平衡的盘片501高速旋转的情况下，也能减小盘片501的振动。因此，第16实施例的盘片驱动装置，能不降低数据的传送速率进行稳定的记录重放。按照第16实施例，能减小对盘片驱动装置外部造成的振动或噪声，同时能实现延长主轴电动机502寿命长的盘片驱动装置。As described above, according to the structure of the disk drive device of the sixteenth embodiment, since four or more clamping mechanism protrusions 551 are arranged on the disk pressing surface of the clamping mechanism 413, four or more clamping mechanism protrusions 551 are arranged on the disk placing surface of the turntable 213. At the same time, the clamping mechanism protrusion 551 and the turntable protrusion 552 clamp the top and bottom of the disk 501 at the same position, so the vibration of the disk 501 can be reliably reduced. Thus, in the disk drive device of the sixteenth embodiment, when the disk 501 is placed on the turntable 213 with wobble and rotates at a high speed, or the disk 501 is seriously out of balance due to the wobble of the disk 501 Even in the case of high-speed rotation, the vibration of the disk 501 can be reduced. Therefore, the disk drive device of the sixteenth embodiment can perform stable recording and reproduction without reducing the data transfer rate. According to the sixteenth embodiment, it is possible to reduce vibration and noise to the outside of the disk drive device and to realize a long life of the spindle motor 502 at the same time.

《第17实施例》"The Seventeenth Embodiment"

下面，参照附图62至图64说明本发明第17实施例的盘片驱动装置。Next, a disk drive device according to a seventeenth embodiment of the present invention will be described with reference to FIGS. 62 to 64. FIG.

图62是表示本发明第17实施例盘片驱动装置中夹紧机构414附近的侧剖面图。图63是表示第17实施例盘片驱动装置中夹紧机构414动作的平面剖面图。图64是表示本发明第16实施例盘片驱动装置中夹紧机构414附近的侧剖面图。对与图52～图61所示第14实施例至第16实施例的盘片驱动装置中构件具有实质上相同功能、结构的构件，赋以相同的标号，引用先前实施例的说明，并省略重复的说明。Fig. 62 is a side sectional view showing the vicinity of the clamp mechanism 414 in the disk drive device according to the seventeenth embodiment of the present invention. Fig. 63 is a plan sectional view showing the operation of the clamp mechanism 414 in the disk drive device of the seventeenth embodiment. Fig. 64 is a side sectional view showing the vicinity of the clamp mechanism 414 in the disk drive device according to the sixteenth embodiment of the present invention. Components having substantially the same functions and structures as those in the disc drive devices of the fourteenth to sixteenth embodiments shown in FIGS. 52 to 61 are given the same reference numerals, and the descriptions of the previous embodiments are quoted and omitted. Repeat instructions.

在夹紧机构414设有中心突起546，与形成在转台214的轴套522的定位孔523配合，使盘片501对准中心进出，其周围固定有环状磁铁544及后磁轭545。在夹紧机构414的底面(图62中的下面)形成有与盘片501接触的4个夹紧机构突起551。The clamping mechanism 414 is provided with a central protrusion 546, which cooperates with the positioning hole 523 formed in the sleeve 522 of the turntable 214 to align the disc 501 in and out, and a ring magnet 544 and a rear yoke 545 are fixed around it. On the bottom surface (the lower surface in FIG. 62 ) of the clamp mechanism 414 are formed four clamp mechanism protrusions 551 that come into contact with the disk 501 .

第17实施例盘片驱动装置，在夹紧机构414内部形成具有环状空间的环状轨道部562。在该环状轨道部562中放有可移动的多个(例如6个)磁性球563。如图62及图63所示，环状轨道部562是中空的空间，形成在夹紧机构414中心的中心突起546周围固定的环状磁铁544和后磁轭545的更外侧，与中心突起546同轴。用上述构成的环状轨道部562和放在该环状轨道部562内的多个球563构成平衡器561，平衡器561与夹紧机构414形成一体。In the disk drive device of the seventeenth embodiment, an annular rail portion 562 having an annular space is formed inside the clamp mechanism 414 . A plurality of (for example, six) magnetic balls 563 are placed in the annular rail portion 562 to move. As shown in Fig. 62 and Fig. 63, the annular track part 562 is a hollow space, and is formed on the outer side of the annular magnet 544 and the rear yoke 545 fixed around the central protrusion 546 in the center of the clamping mechanism 414, and is connected with the central protrusion 546. coaxial. The balancer 561 is constituted by the annular rail portion 562 configured as above and a plurality of balls 563 placed in the annular rail portion 562 , and the balancer 561 is integrated with the clamp mechanism 414 .

盘片501停止时，磁性球563吸附于磁铁544(图62(a))。一旦盘片501旋转，放在与盘片501一起旋转的夹紧机构414的环状轨道部562内的球563因离心力而脱离磁铁544，沿环状轨道部562内侧外周壁面转动(图62〔b〕)。When the disk 501 stops, the magnetic ball 563 is attracted to the magnet 544 (FIG. 62(a)). Once the disc 501 rotates, the ball 563 placed in the annular track portion 562 of the clamping mechanism 414 that rotates with the disc 501 is separated from the magnet 544 due to centrifugal force, and rotates along the inner peripheral wall surface of the annular track portion 562 (Fig. 62 [ b)).

在第17实施例盘片驱动装置中，采用刚性低的隔振子(弹性体)509，如图52所示，用于连接底座508和主底架510。该隔振子509变形引起底座508的机械振动(与盘片501记录面平行的方向中的一次共振频率)设定得比盘片501的旋转频率低。具体而言，盘片501的旋转频率为约100Hz，通过隔振子509将读写头503(图52)移动方向的底座508的振动和与其正交方向的底座508的振动的一次共振频率设定成约60Hz。In the disk drive device of the seventeenth embodiment, a low-rigidity isolator (elastic body) 509 is used for connecting the base 508 and the main chassis 510 as shown in FIG. 52 . The mechanical vibration of the chassis 508 (primary resonance frequency in a direction parallel to the recording surface of the disk 501 ) caused by the deformation of the isolator 509 is set lower than the rotational frequency of the disk 501 . Specifically, the rotation frequency of the disk 501 is about 100 Hz, and the primary resonance frequency of the vibration of the base 508 in the moving direction of the read/write head 503 ( FIG. 52 ) and the vibration of the base 508 in the direction perpendicular to the vibration isolator 509 is set. into about 60Hz.

在如上构成的第17实施例盘片驱动装置中，设置平衡器561是为了改善盘片501的失衡，使盘片501高速稳定旋转。In the disk drive device of the seventeenth embodiment constructed as above, the balancer 561 is provided to improve the unbalance of the disk 501, so that the disk 501 rotates stably at a high speed.

所谓盘片501的失衡，是因盘片501的夹紧孔512的偏心、盘片501厚度不均匀等成形时发生的不均匀造成的。在本发明中，将这些盘片501的不均匀归纳定义为失衡量，该盘片501的失衡量越大，盘片501旋转时的盘片振动量就越大。The so-called unbalance of the disk 501 is caused by unevenness during molding, such as the eccentricity of the clamping hole 512 of the disk 501 and the uneven thickness of the disk 501 . In the present invention, the unevenness of the disk 501 is collectively defined as an imbalance, and the greater the imbalance of the disk 501, the greater the disk vibration when the disk 501 rotates.

在第17实施例盘片驱动装置中，在放置于转台214上的盘片501旋转时，例如，使失衡量大的盘片501以100Hz旋转时，在离心力作用下，底座508一边使隔振子509变形，一边按盘片501的旋转频率振摆旋转。此时，因底座508的共振频率比旋转频率低，故盘片501的离心力的方向与底座508的位移方向大致相反。在底座508上旋转着的盘片501的振摆旋转的中心轴配置在盘片501的重心与主轴电动机502的旋转中心轴之间。也即，若以平衡器561为中心加以观测，则对平衡器561中的球563的离心力作用在与盘片501的离心力大致相反的方向上。由此，盘片501的偏心引起的失衡被球563的重量抵消一部分。因此，若与没有平衡器561的情形相比，放置于转台214上的盘片501和夹紧机构414的失衡量被减小。盘片501的失衡量与平衡器561的失衡量平衡时，从表面上看，构成与转台214上放置平衡盘片501的旋转相同的状态。In the disk drive device of the seventeenth embodiment, when the disk 501 placed on the turntable 214 rotates, for example, when the disk 501 with a large imbalance is rotated at 100 Hz, the base 508 rotates the vibration isolator under the action of centrifugal force. 509 is deformed and rotates according to the rotation frequency of the disk 501 while vibrating. At this time, since the resonance frequency of the base 508 is lower than the rotation frequency, the direction of the centrifugal force of the disk 501 is substantially opposite to the displacement direction of the base 508 . The center axis of the oscillating rotation of the disk 501 rotating on the base 508 is arranged between the center of gravity of the disk 501 and the rotation center axis of the spindle motor 502 . That is, when viewed with the balancer 561 as the center, the centrifugal force on the balls 563 in the balancer 561 acts in a direction substantially opposite to the centrifugal force of the disk 501 . Thus, the weight of the ball 563 partially offsets the imbalance caused by the eccentricity of the disk 501 . Therefore, compared with the situation without the balancer 561 , the imbalance between the disc 501 placed on the turntable 214 and the clamping mechanism 414 is reduced. When the unbalanced amount of the disk 501 is balanced with the unbalanced amount of the balancer 561 , the same state as the rotation of the balanced disk 501 placed on the turntable 214 is constituted on the surface.

因此，按照第17实施例盘片驱动装置，盘片501、主轴电动机502及底座508不会振动，能进行稳定的数据记录重放。对盘片驱动装置外部也能减小振动、噪声，能确保延长主轴电动机502的寿命。Therefore, according to the disk drive device of the seventeenth embodiment, the disk 501, the spindle motor 502, and the chassis 508 do not vibrate, and stable data recording and reproduction can be performed. Vibration and noise can be reduced also on the outside of the disk drive device, and the life of the spindle motor 502 can be ensured to be extended.

在第17实施例盘片驱动装置的平衡器561中，夹紧机构414内部放有多个球563。如图63所示，在盘片501的失衡量大的情况下，球563集中在与盘片501失衡相反的一侧(图63(b))。相反，在盘片501平衡情况下，球563在环状轨道部562的内侧外周壁面等间隔分布，且球563本身不会产生失衡(图63(c))。在盘片501的失衡量处于上述中间情况下，球563也处于上述中间状态配置。由此，平衡器561能适应盘片501的各种失衡量。In the balancer 561 of the disk drive apparatus of the seventeenth embodiment, a plurality of balls 563 are placed inside the clamp mechanism 414 . As shown in FIG. 63, when the imbalance of the disk 501 is large, the balls 563 concentrate on the side opposite to the imbalance of the disk 501 (FIG. 63(b)). On the contrary, when the disc 501 is balanced, the balls 563 are distributed at equal intervals on the inner and outer peripheral walls of the annular track portion 562, and the balls 563 themselves will not be unbalanced (FIG. 63(c)). When the imbalance of the disk 501 is in the above-mentioned intermediate state, the balls 563 are also arranged in the above-mentioned intermediate state. Thus, the balancer 561 can adapt to various imbalances of the disk 501 .

图64是表示夹紧机构414的盘片压紧面有凹凸情况的夹紧机构414附近的侧剖面图。在图64所示情况下，在盘片501与夹紧机构414之间发生晃动。于是，平衡器561的球563的动作不规则，球563进行伴有上下动的转动，使得在环状轨道部562的内侧外周壁面跳动。由于球563上下运动引起振动，故球563沿环状轨道部562的内侧外周壁面不能进行平滑的转动。因此，在上述状态下，当盘片501高速旋转时仅用平衡器561不可能充分抵消失衡。其结果是，有时仅设置平衡器561也不能充分减小盘片501失衡产生的振动。此外，在平衡的盘片501高速旋转情况下，由于平衡器561的球563沿环状轨道部562内侧外周壁面不能平滑转动，故反过来会对主轴电动机502产生失衡，结果增加了盘片501及整个盘片驱动装置整体的振动。FIG. 64 is a side sectional view of the vicinity of the clamp mechanism 414, showing that the disc pressing surface of the clamp mechanism 414 has unevenness. In the situation shown in FIG. 64 , wobbling occurs between the disk 501 and the clamp mechanism 414 . Then, the movement of the ball 563 of the balancer 561 is irregular, and the ball 563 rotates with up and down movement, thereby bouncing on the inner outer peripheral wall surface of the ring-shaped rail portion 562 . Since the ball 563 vibrates when moving up and down, the ball 563 cannot rotate smoothly along the inner peripheral wall surface of the annular rail portion 562 . Therefore, in the above state, it is impossible to sufficiently counteract the unbalance only with the balancer 561 when the disk 501 rotates at a high speed. As a result, even providing the balancer 561 alone may not sufficiently reduce the vibration caused by the imbalance of the disk 501 . In addition, when the balanced disk 501 rotates at a high speed, since the ball 563 of the balancer 561 cannot rotate smoothly along the inner peripheral wall surface of the ring-shaped rail portion 562, it will conversely produce an imbalance in the spindle motor 502, resulting in an increase in the number of disks 501. And the overall vibration of the entire disk drive device.

在已有的盘片驱动装置中，采用没有夹紧机构突起的夹紧机构，故即使与盘片501间没有晃动，则因在3处夹紧盘片501而易在盘片501中发生“6等分模式”的振动。在这样的已有盘片驱动装置中即使设置上述平衡器561，也会因“6等分模式”振动使平衡器561中球563的动作不规则，所进行的转动伴有上下运动，使球563在环状轨道部562的内侧外周壁面跳动。因此，在已有的盘片驱动装置中，即使在与盘片501间没有晃动，也会由于球563在环状轨道部562的内侧外周壁面中不能平滑转动而增加盘片501及整个盘片驱动装置的振动。In the conventional disk drive device, a clamp mechanism without a clamp mechanism protrusion is used, so even if there is no vibration between the disk 501 and the disk 501 is clamped at three places, it is easy to cause "clamping" in the disk 501. 6 equal parts mode" vibration. Even if the above-mentioned balancer 561 is provided in such an existing disk drive device, the action of the ball 563 in the balancer 561 will be irregular due to the vibration of the "six equally divided mode", and the rotation carried out is accompanied by up and down motion, causing the ball to move up and down. 563 dances on the inner peripheral wall surface of the ring-shaped rail portion 562 . Therefore, in the existing disk driving device, even if there is no shaking between the disk 501, the ball 563 cannot rotate smoothly in the inner peripheral wall surface of the annular track portion 562, which increases the number of disks 501 and the entire disk. Vibration of the drive unit.

针对上述问题，在本发明第17实施例驱动装置中，通过在夹紧机构414的盘片压紧面547设置4个夹紧机构突起551，消除了盘片501与夹紧机构414间的晃动。因此，球563在环状轨道部562内沿内侧外周壁面平滑转动，可获得充分抵消盘片501失衡的效果。In view of the above-mentioned problems, in the driving device of the seventeenth embodiment of the present invention, four clamping mechanism protrusions 551 are provided on the disc pressing surface 547 of the clamping mechanism 414 to eliminate the shaking between the disc 501 and the clamping mechanism 414 . Therefore, the ball 563 rotates smoothly along the inner peripheral wall surface in the ring-shaped track portion 562 , and the effect of fully offsetting the unbalance of the disk 501 can be obtained.

在第17实施例盘片驱动装置中，由于夹紧机构突起551设置4个以上，故能减小“6等分模式”、“8等分模式”的振动，同时球563在环状轨道部562内平滑转动，能获得充分抵消盘片501失衡的效果。In the disc drive device of the seventeenth embodiment, since there are more than four clamping mechanism protrusions 551, the vibrations in the "sixth mode" and "eighth mode" can be reduced. 562, the smooth rotation can obtain the effect of fully offsetting the unbalance of the disc 501.

在第17实施例的盘片驱动装置中，各夹紧机构突起551的高度(h1)差(平面度)在40μm范围内。如在该范围内，则利用4个夹紧机构突起551和转台214能可靠地夹紧住盘片501。最好是能使夹紧机构突起551的平面度在20μm范围内，则在与转台214之间能更进一步可靠地夹紧盘片501，能进一步减小盘片501高速旋转情况下的振动。在此基础上，在第17实施例盘片驱动装置中由于加上平衡器561的效果而消除盘片501的失衡，故能更进一步减小盘片501的振动。In the disk drive device of the seventeenth embodiment, the height (h1) difference (flatness) of each chucking mechanism protrusion 551 is within the range of 40 [mu]m. Within this range, the disc 501 can be securely clamped by the four clamp mechanism protrusions 551 and the turntable 214 . Preferably, the flatness of the clamping protrusion 551 can be within 20 μm, so that the disc 501 can be more reliably clamped between the disc 501 and the turntable 214, and the vibration of the disc 501 can be further reduced when the disc 501 rotates at a high speed. On this basis, in the disk drive device of the seventeenth embodiment, the unbalance of the disk 501 can be eliminated by adding the effect of the balancer 561, so the vibration of the disk 501 can be further reduced.

在第17实施例的盘片驱动装置中，以夹紧机构突起551和转台552的形状为圆柱形进行了说明。但是，本发明中夹紧机构突起551的水平剖面形状未必要圆形，可设定为三角形、四边形、椭圆形等自由剖面形状。夹紧机构突起551的前端与前述第14实施例的一样，将前端变小，也能获得同样的效果。In the disk drive device of the seventeenth embodiment, the description has been made on the assumption that the chuck mechanism protrusion 551 and the turntable 552 are cylindrical in shape. However, in the present invention, the horizontal cross-sectional shape of the clamping mechanism protrusion 551 is not necessarily circular, and can be set to a free cross-sectional shape such as a triangle, a quadrangle, or an ellipse. The front end of the clamping mechanism protrusion 551 is the same as that of the aforementioned fourteenth embodiment, and the same effect can be obtained by making the front end smaller.

在第17实施例的盘片驱动装置中，以仅在夹紧机构414侧设置夹紧机构突起551为例进行了说明，但也可在转台214设置4个转台突起552保证盘片501稳定并处于平面状态，这样也能充分发挥平衡器561的效果。In the disc drive device of the seventeenth embodiment, the clamping mechanism protrusion 551 is provided only on the clamping mechanism 414 side as an example for description, but four turntable protrusions 552 may be provided on the turntable 214 to ensure that the disc 501 is stable and In a flat state, the effect of the balancer 561 can also be brought into full play.

第17实施例盘片驱动装置，在平衡器561中使用了球563，但球563未必要是磁性体，如果是具有重量能抵消盘片501偏心造成失衡的某种材料物品，就不限定是球形，即使是圆柱、立方体、盘片上构件、板状构件，也能获得同样的效果。材料也不限定为磁性材料，即使是非磁性的金属、树脂、陶瓷、或比重大的液体，也能获得同样的效果。In the seventeenth embodiment of the disk drive device, the ball 563 is used in the balancer 561, but the ball 563 is not necessarily a magnetic body. If it is a material item with a weight that can offset the imbalance caused by the eccentricity of the disk 501, it is not limited. Spherical, even cylinders, cubes, disc-on-members, and plate-like members can achieve the same effect. The material is not limited to a magnetic material, and the same effect can be obtained even if it is a non-magnetic metal, resin, ceramics, or a liquid with a large specificity.

第17实施例构成盘片驱动装置，其夹紧机构414内含有磁铁544和后磁轭545，对置磁轭524内含在转台214的轴套522中。但是其构成也可以改为，使转台214的轴套522内含有磁铁544和后磁轭545，夹紧机构414内含有对置磁轭524，也一定具有减小盘片501高速旋转时振动的效果。The seventeenth embodiment constitutes a disk drive device, the clamping mechanism 414 includes a magnet 544 and a rear yoke 545 , and the opposing yoke 524 is included in a sleeve 522 of the turntable 214 . But its structure also can be changed, make the axle sleeve 522 of turntable 214 contain magnet 544 and rear yoke 545, and clamping mechanism 414 contains opposite yoke 524, also must have the effect of reducing the vibration when disk 501 rotates at high speed Effect.

如上所述，按照第17实施例的盘片驱动装置的结构，夹紧机构414的盘片压紧面上配置4个以上的夹紧机构突起551，夹紧机构414内部的环状轨道部562放有可移动的多个(如6个)球563，故能抵消盘片501偏心或厚度不均匀等引起的失衡，能可靠地减小盘片501的振动。由此，第17实施例的盘片驱动装置，在将盘片501放置在有振摆的转台214上并高速旋转情况下，或在盘片501有振摆或严重失衡的盘片501高速旋转的情况下，也能减小盘片501的振动。在此基础上，按照第17实施例的盘片驱动装置，即使放置失衡量大的盘片501进行高速旋转，也能减小盘片501的振动。因此，第17实施例的盘片驱动装置能不降低数据的传送速率进行稳定的记录重放。按照第17实施例的盘片驱动装置，能减小对盘片驱动装置外部造成的振动或噪声，同时能实现延长主轴电动机502寿命的盘片驱动装置。As described above, according to the structure of the disc drive device of the seventeenth embodiment, four or more clamping mechanism protrusions 551 are arranged on the disc pressing surface of the clamping mechanism 414, and the annular rail portion 562 inside the clamping mechanism 414 There are a plurality of movable balls 563 (such as 6), so the imbalance caused by the disc 501's eccentricity or uneven thickness can be offset, and the vibration of the disc 501 can be reliably reduced. Thus, in the disk drive device of the seventeenth embodiment, when the disk 501 is placed on the turntable 214 with wobble and rotates at a high speed, or when the disk 501 has wobble or is severely unbalanced, the disk 501 rotates at a high speed. In the case of , the vibration of the disk 501 can also be reduced. On this basis, according to the disk drive apparatus of the seventeenth embodiment, even if the disk 501 with a large imbalance is placed and rotated at a high speed, the vibration of the disk 501 can be reduced. Therefore, the disk drive device of the seventeenth embodiment can perform stable recording and reproduction without reducing the data transfer rate. According to the disk drive device of the seventeenth embodiment, vibration and noise to the outside of the disk drive device can be reduced, and at the same time, the life of the spindle motor 502 can be prolonged.

《第18实施例》"Eighteenth Embodiment"

下面，参照附图65和图68说明本发明第18实施例的盘片驱动装置。Next, a disk drive device according to an eighteenth embodiment of the present invention will be described with reference to FIGS. 65 and 68. FIG.

图65是表示本发明第18实施例盘片驱动装置中夹紧机构415附近的侧剖面图(a)和该夹紧机构415的底视图(b)。图66是用于说明设置夹紧机构突起551引起的盘片501振动状态的夹紧机构附近的侧剖面图。图67及图68是表示本发明第18实施例盘片驱动装置中其它例的夹紧机构附近的侧剖面图(a)和该夹紧机构的底面图(b)。对与前述图52～图64所示第14～17实施例的盘片驱动装置中的构件具有实质上相同功能、结构的构件，赋以相同的标号，引用先前实施例的说明，并省略重复的说明。Fig. 65 is a side sectional view (a) showing the vicinity of the clamp mechanism 415 and a bottom view (b) of the clamp mechanism 415 in the disk drive apparatus according to the eighteenth embodiment of the present invention. FIG. 66 is a side sectional view of the vicinity of the clamp mechanism for explaining the vibration state of the disk 501 caused by the provision of the clamp mechanism protrusion 551. FIG. 67 and 68 are side sectional views (a) and bottom views (b) showing the vicinity of the clamping mechanism in other examples of the disk drive device according to the eighteenth embodiment of the present invention. Components having substantially the same functions and structures as those in the disc drive devices of the fourteenth to seventeenth embodiments shown in FIGS. 52 to 64 are given the same reference numerals, and the descriptions of the previous embodiments are cited, and repetitions are omitted. instruction of.

在图65中，转台521固定于主轴电动机的轴528上，可旋转支持着盘片501的夹紧区511。与盘片501的夹紧孔512配合的轴套522与转台521形成一体。利用盘片501与轴套522的配合对盘片501定位。在轴套522与夹紧机构415相对的面(图65(a)中的上面)的中央形成定位孔523。对置磁轭524埋设固定于轴套522。In FIG. 65 , the turntable 521 is fixed on the shaft 528 of the spindle motor, and rotatably supports the clamping area 511 of the disc 501 . A shaft sleeve 522 that fits with the clamping hole 512 of the disc 501 is integrally formed with the turntable 521 . The disk 501 is positioned by the cooperation of the disk 501 and the sleeve 522 . A positioning hole 523 is formed in the center of the surface (the upper surface in FIG. 65( a )) of the boss 522 opposed to the clamp mechanism 415 . The opposing yoke 524 is embedded and fixed on the sleeve 522 .

在夹紧机构415中，磁铁支座543上固定有中心突起546，用来与转台521设置的定位孔523配合以确保转台521和夹紧机构415在同一中心位置。在该中心突起546周围固定有磁铁544和后磁轭545。在构成夹紧机构415底面的盘片夹套542的底面形成平坦的面。In the clamping mechanism 415 , a central protrusion 546 is fixed on the magnet support 543 for cooperating with the positioning hole 523 provided on the turntable 521 to ensure that the turntable 521 and the clamping mechanism 415 are at the same central position. A magnet 544 and a rear yoke 545 are fixed around the center protrusion 546 . A flat surface is formed on the bottom surface of the disc chuck 542 constituting the bottom surface of the clamp mechanism 415 .

在如上构成的第18实施例盘片驱动装置中，当盘片501夹紧在夹紧机构415与转台521之间的状态下，盘片501通过夹紧孔512与轴套522的配合，安装在转台521上。此时，盘片501通过作用于包含在夹紧机构415内的磁铁544与固定于转台521的对置磁轭524之间的吸引磁力而被保持住。这样保持住的盘片501随主轴电动机502的旋转而与转台521及夹紧机构415作整体旋转。In the disk drive device of the eighteenth embodiment constituted as above, when the disk 501 is clamped between the clamping mechanism 415 and the turntable 521, the disk 501 is installed through the cooperation of the clamping hole 512 and the sleeve 522. On turntable 521. At this time, the disk 501 is held by the attractive magnetic force acting between the magnet 544 included in the clamp mechanism 415 and the opposing yoke 524 fixed to the turntable 521 . The disc 501 thus held rotates integrally with the turntable 521 and the clamp mechanism 415 as the spindle motor 502 rotates.

第18实施例的盘片驱动装置如图65(a)和(b)所示，在树脂制夹紧机构415底面的盘片夹套542形成有圆柱形的8个夹紧机构突起551。形成夹紧机构突起551的位置在以磁铁支座543的中心突起546为中心的2个同心圆上，每个圆上形成4个。在内周圆上的夹紧机构突起551形成在夹紧机构突起551确实能压紧住盘片501的夹紧区511的位置上。配置夹紧机构突起551的外周圆在离开夹紧区511外侧的位置，配置在距盘片501外周的内侧范围内。In the disk drive device of the eighteenth embodiment, as shown in FIGS. 65(a) and (b), eight cylindrical clamp protrusions 551 are formed on the disc chuck 542 on the bottom surface of the resin clamp 415. The positions where the clamping mechanism protrusions 551 are formed are on two concentric circles centered on the central protrusion 546 of the magnet holder 543, and four are formed on each circle. The clamping mechanism protrusion 551 on the inner circumference is formed at a position where the clamping mechanism protrusion 551 can indeed press against the clamping area 511 of the disc 501 . The outer circumference of the clamping mechanism protrusion 551 is located outside the clamping area 511 and within the inner range from the outer circumference of the disc 501 .

分别在内周圆和外周圆上的夹紧机构突起551设置在将该圆4等分的位置，也即，设置在每隔90度分割的位置。各夹紧机构突起551的高度(h1)差(平面度)规定在40μm范围内。这样一来，如果各夹紧机构突起551的高度(h1)差(平面度)在40μm范围内，转台521的盘片放置面上凹凸的高度差(平面度)比夹紧机构突起551的平面度小得多，则用4个夹紧机构突起551和转台521能可靠地夹紧盘片501。The clamping mechanism protrusions 551 on the inner and outer peripheral circles, respectively, are provided at positions where the circle is equally divided into four, that is, at positions divided every 90 degrees. The height (h1) difference (flatness) of each clamping mechanism protrusion 551 is specified within the range of 40 μm. In this way, if the height (h1) difference (flatness) of each clamping mechanism protrusion 551 is within the range of 40 μm, the height difference (flatness) of the unevenness (flatness) on the disk placement surface of the turntable 521 is larger than that of the clamping mechanism protrusion 551 plane. If the degree is much smaller, the disc 501 can be reliably clamped by the four clamping mechanism protrusions 551 and the turntable 521.

在第18实施例的盘片驱动装置中，一旦将盘片501放置于转台521上，则盘片501随固定于主轴电动机502的底座508一起向上推向夹紧机构415的方向。其结果，通过夹紧机构415和转台521夹紧盘片501。此时，在夹紧机构415、盘片501和转台521间的定位，除了它们的中心要与主轴电动机的轴528的中心一致外，对旋转方向的位置没有限制，可任意定位。在这种情况下，夹紧机构415也能防止盘片501的“6等分模式”中盘片501的向上变形。且转台521能防止盘片501的“6等分模式”中盘片501的向下变形。In the disk driving device of the eighteenth embodiment, once the disk 501 is placed on the turntable 521 , the disk 501 is pushed upward toward the clamping mechanism 415 together with the base 508 fixed to the spindle motor 502 . As a result, the disc 501 is clamped by the clamp mechanism 415 and the turntable 521 . At this time, the positioning among the clamping mechanism 415, the disk 501 and the turntable 521, except that their centers must be consistent with the center of the shaft 528 of the spindle motor, there is no restriction on the position in the rotation direction, and can be positioned arbitrarily. In this case, the clamping mechanism 415 can also prevent the upward deformation of the disk 501 in the "sixth mode" of the disk 501 . And the turntable 521 can prevent the disk 501 from being deformed downward in the "six equal division mode" of the disk 501 .

因此，在第18实施例盘片驱动装置中，防止了盘片501作为“6等分模式”的上下方向的变形。在盘片501高速旋转情况下，能将盘片501的“6等分模式”振动减小至基本上检测不到的状态。Therefore, in the disk drive apparatus of the eighteenth embodiment, deformation in the up-down direction of the disk 501 as a "sixth pattern" is prevented. When the disk 501 rotates at a high speed, the "sixth mode" vibration of the disk 501 can be reduced to a substantially undetectable state.

在第18实施例的盘片驱动装置中，若各转台突起552的高度(h2)差(平面度)在40μm范围内，则能可靠地夹紧盘片501的夹紧区511。最好是使转台突起552中平面度在20μm范围内，则在与夹紧机构415之间能更进一步可靠地夹紧盘片501，能进一步减小盘片501高速旋转时的振动。In the disk drive device of the eighteenth embodiment, if the height (h2) difference (flatness) of the turntable protrusions 552 is within 40 μm, the clamping area 511 of the disk 501 can be reliably clamped. It is preferable to make the flatness of the turntable protrusion 552 within the range of 20 μm, then the disc 501 can be more reliably clamped between the clamping mechanism 415 and the vibration of the disc 501 when the disc 501 rotates at a high speed can be further reduced.

在已有技术的盘片驱动装置中，如图66(a)所示，在用已有的夹紧机构581不能夹紧盘片501的夹紧区511的情况下，从盘片501的最外周至夹紧孔512的位置，处于盘片501可能向上变形的状态。因此，盘片501高速旋转时，盘片501在上下方向可能变形的范围较宽，故盘片501振动的振幅量会很大。In the prior art disc drive apparatus, as shown in FIG. 66(a), when the clamping area 511 of the disc 501 cannot be clamped by the existing clamping mechanism 581, the disc 501 from the outermost The position from the outer periphery to the clamping hole 512 is in a state where the disc 501 may be deformed upward. Therefore, when the disk 501 rotates at a high speed, the range in which the disk 501 may deform in the vertical direction is relatively wide, so the vibration amplitude of the disk 501 will be large.

在前述第14实施例盘片驱动装置中，如图66(b)所示，由于能可靠地夹紧夹紧区511，故在从盘片501的最外周至夹紧区511的区间，盘片501处于可在上下方向变形的状态。因此，盘片501高速旋转时，与用已往的夹紧机构581夹紧的情况相比，盘片501可上下变形的范围窄，与已有的盘片驱动装置相比能减小盘片501的振动量。In the disk drive device of the fourteenth embodiment described above, as shown in FIG. 66(b), since the clamping area 511 can be reliably clamped, in the section from the outermost periphery of the disk 501 to the clamping area 511, the disk The sheet 501 is in a state deformable in the vertical direction. Therefore, when the disc 501 rotates at a high speed, the range in which the disc 501 can be deformed up and down is narrow compared with the case of clamping by the conventional clamping mechanism 581, and the size of the disc 501 can be reduced compared with the existing disc drive device. amount of vibration.

除此之外，在第18实施例盘片驱动装置中，如图66(c)所示，除了可靠夹紧盘片501的夹紧区511外，配置在外周圆上的夹紧机构突起551限制着盘片501向上方的变形。由此，在从盘片501最外周至夹紧机构突起551的外周圆的区间不能形成盘片501的上下方向的变形。因此，比起第14实施例盘片驱动装置的夹紧机构541，进一步缩小了盘片501上下方向可变形的范围，能进一步减小盘片501高速旋转时振动的振幅量。In addition, in the disk drive device of the eighteenth embodiment, as shown in FIG. 66(c), in addition to the clamping area 511 that securely clamps the disk 501, the clamping mechanism protrusions 551 arranged on the outer circumference The upward deformation of the disc 501 is restricted. Accordingly, deformation in the vertical direction of the disk 501 cannot be formed in the section from the outermost periphery of the disk 501 to the outer periphery of the clamp protrusion 551 . Therefore, compared with the clamping mechanism 541 of the disk drive device in the fourteenth embodiment, the range of deformation in the vertical direction of the disk 501 is further narrowed, and the amplitude of vibration when the disk 501 rotates at high speed can be further reduced.

图67及图68是表示本发明中第18实施例盘片驱动装置中其它例的夹紧机构附近的侧剖面图(a)和该夹紧机构的底面图(b)。67 and 68 are side sectional views (a) and bottom views (b) showing the vicinity of the clamp mechanism in other examples of the disk drive device of the eighteenth embodiment of the present invention.

在图67(b)所示的盘片驱动装置中，关于夹紧机构突起551在圆周上的配置，是使内圆周的4个与外圆周的4个旋转45度而错开配置。即使这样配置夹紧机构突起551，在盘片501高速旋转情况下减小振动的效果也不会有多大差别。In the disk drive device shown in FIG. 67(b), the circumferential arrangement of the clamping mechanism protrusions 551 is such that four on the inner circumference and four on the outer circumference are shifted by 45 degrees. Even if the clamping mechanism protrusions 551 are arranged in this way, there is not much difference in the effect of reducing vibration when the disk 501 rotates at a high speed.

在图68(b)所示的盘片驱动装置中，夹紧机构突起551这样配置，即在内圆周上等间隔形成4个，在外圆周上等间隔形成8个。如果这样配置夹紧机构突起551，则能更进一步减小盘片501高速旋转时的振动。In the disk drive device shown in FIG. 68(b), the clamping mechanism protrusions 551 are arranged such that four are formed at equal intervals on the inner circumference and eight are formed at equal intervals on the outer circumference. By arranging the clamping mechanism protrusions 551 in this way, the vibration when the disk 501 rotates at a high speed can be further reduced.

这样一来，夹紧机构突起551在盘片501的夹紧区511中夹紧盘片501的内圆周上和在其外侧的限制盘片501向上方变形的外圆周上的位置沿盘片501的旋转方向错开配置，或增加夹紧机构突起551的数目，盘片501的振动与仅在内圆周配置夹紧机构突起551的情况相比，能更进一步减小盘片501高速旋转时的振动。In this way, the position of the clamping mechanism protrusion 551 on the inner circumference of the clamping disc 501 in the clamping area 511 of the disc 501 and on the outer circumference of the outer circumference restricting the upward deformation of the disc 501 is along the position of the disc 501. The rotation direction of the disc 501 is staggered, or the number of clamping mechanism protrusions 551 is increased, and the vibration of the disc 501 can further reduce the vibration of the disc 501 when the disc 501 rotates at a high speed compared with the case where the clamping mechanism protrusions 551 are only arranged on the inner circumference. .

第18实施例的盘片驱动装置中，以夹紧机构突起551的形状为圆柱形进行了说明。但是，本发明中夹紧机构突起551的水平剖面形状未必要圆形，可设定为三角形、四边形、椭圆形等自由剖面形状。In the disk drive device of the eighteenth embodiment, the chuck mechanism protrusion 551 has been described as a cylindrical shape. However, in the present invention, the horizontal cross-sectional shape of the clamping mechanism protrusion 551 is not necessarily circular, and can be set to a free cross-sectional shape such as a triangle, a quadrangle, or an ellipse.

在第18实施例盘片驱动装置中，夹紧机构551的前端与前述第14实施例的一样，即使前端变小也能获得与前述第14实施例相同的效果。例如，假定内圆周的夹紧机构突起551和外圆周的夹紧机构突起551位于沿盘片501的旋转方向相同的位置，则通过在夹紧机构突起551间形成一体化的椭圆或长方形，也能简化夹紧机构突起551的形状。In the disk drive device of the eighteenth embodiment, the front end of the clamp mechanism 551 is the same as that of the fourteenth embodiment described above, and the same effect as that of the fourteenth embodiment described above can be obtained even if the front end is made smaller. For example, assuming that the clamping mechanism protrusions 551 of the inner circumference and the clamping mechanism protrusions 551 of the outer circumference are located at the same position along the rotation direction of the disc 501, by forming an integrated ellipse or rectangle between the clamping mechanism protrusions 551, it is also possible to The shape of the clamping mechanism protrusion 551 can be simplified.

在第18实施例盘片驱动装置中，只是在夹紧机构415侧设置夹紧机构突起551，但是在转台521设置4个以上的转台突起552，确保盘片501的稳定而且保持平面，则能更进一步获得减小盘片501高速旋转时的振动的效果。In the disc drive device of the eighteenth embodiment, only the clamping mechanism protrusion 551 is provided on the clamping mechanism 415 side, but more than four turntable protrusions 552 are provided on the turntable 521 to ensure that the disc 501 is stable and maintains a plane, then it can Still further, the effect of reducing vibration when the disk 501 rotates at a high speed is obtained.

第18实施例构成的盘片驱动装置，其夹紧机构415内含有磁铁544和后磁轭545，对置磁轭524内含在转台521的轴套522中。但是其构成也可以改为，使转台521的轴套522内含有磁铁544和后磁轭545，夹紧机构415内含有对置磁轭524，也一定具有减小盘片501高速旋转时振动的效果。In the disk drive device according to the eighteenth embodiment, the clamping mechanism 415 includes a magnet 544 and a rear yoke 545 , and the opposing yoke 524 is included in a sleeve 522 of a turntable 521 . But its composition also can be changed, make the axle sleeve 522 of turntable 521 contain magnet 544 and rear yoke 545, and clamping mechanism 415 contains opposite yoke 524, also must have the effect of reducing the vibration when disk 501 rotates at high speed Effect.

如上所述，按照第18实施例的盘片驱动装置的结构，夹紧机构415的盘片压紧面上配置4个以上的夹紧机构突起551，除此之外，在盘片501的夹紧区外侧也配置4个以上的夹紧机构突起551，故能可靠减小盘片501的振动。由此，第18实施例的盘片驱动装置，在将盘片501放置在有振摆的转台521上并高速旋转情况下，或在盘片501有振摆或严重失衡的盘片501高速旋转的情况下，也能减小盘片501的振动。因此，按照第18实施例的盘片驱动装置，能不降低数据的传送速率进行稳定的记录重放。另外，第18实施例的盘片驱动装置，能减小对盘片驱动装置外部造成的振动或噪声，同时能实现延长主轴电动机502的寿命。As described above, according to the structure of the disk drive device of the eighteenth embodiment, four or more clamping mechanism protrusions 551 are arranged on the disk pressing surface of the clamping mechanism 415, and in addition, there More than 4 clamping mechanism protrusions 551 are arranged outside the tight area, so the vibration of the disc 501 can be reliably reduced. Thus, in the disk drive device of the eighteenth embodiment, when the disk 501 is placed on the turntable 521 with wobble and rotates at a high speed, or when the disk 501 has wobble or is severely unbalanced, the disk 501 rotates at a high speed. In the case of , the vibration of the disk 501 can also be reduced. Therefore, according to the disk drive device of the eighteenth embodiment, stable recording and reproduction can be performed without reducing the data transfer rate. In addition, the disk drive device of the eighteenth embodiment can reduce the vibration and noise to the outside of the disk drive device, and at the same time can realize the extension of the life of the spindle motor 502 .

《第19实施例》"The Nineteenth Embodiment"

下面，参照附图69～图71说明本发明第19实施例的盘片驱动装置。Next, a disk drive device according to a nineteenth embodiment of the present invention will be described with reference to FIGS. 69 to 71. FIG.

图69是表示本发明第19实施例盘片驱动装置中夹紧机构541附近的侧剖面图(a)和该夹紧机构541的底视图(b)。在图69(b)中，用斜线图示设置在夹紧机构541底面的夹紧机构突起551和贴附于转台216的转台用橡胶薄片571，并图示出各自的位置关系。Fig. 69 is a side sectional view (a) showing the vicinity of the clamp mechanism 541 and a bottom view (b) of the clamp mechanism 541 in the disk drive apparatus according to the nineteenth embodiment of the present invention. In FIG. 69( b ), the clamping mechanism protrusion 551 provided on the bottom surface of the clamping mechanism 541 and the turntable rubber sheet 571 attached to the turntable 216 are shown with oblique lines, and their positional relationship is shown in the figure.

图70及图71是表示本发明中第19实施例盘片驱动装置中其它例的夹紧机构附近的侧剖面图(a)和该夹紧机构的底面图(b)。对与前述图52～图68所示第14～18实施例的盘片驱动装置中的构件具有实质上相同功能、结构的构件，赋以相同的标号，引用先前实施例的说明，并省略重复的说明。70 and 71 are a side sectional view (a) and a bottom view (b) showing the vicinity of the clamp mechanism in another example of the disk drive device of the nineteenth embodiment of the present invention. Components having substantially the same functions and structures as those in the disc drive devices of the fourteenth to eighteenth embodiments shown in FIGS. 52 to 68 are given the same reference numerals, and the descriptions of the previous embodiments are cited, and repetitions are omitted. instruction of.

在图69(a)中，转台216固定于主轴电动机的轴528上，对着盘片501夹紧区511的转台216的盘片放置面216a贴附有环状转台用橡胶薄片571。由此，转台216在结构上通过转台用橡胶薄片571可旋转支持着盘片501的夹紧区511。In FIG. 69( a ), the turntable 216 is fixed on the shaft 528 of the spindle motor, and a rubber sheet 571 for an annular turntable is attached to the disk placement surface 216 a of the turntable 216 facing the clamping area 511 of the disk 501 . Thus, the turntable 216 structurally supports the clamping area 511 of the disk 501 through the rubber sheet 571 for the turntable to rotatably support.

与盘片501的夹紧孔512配合的轴套522与转台216形成一体。利用盘片501夹紧孔512与轴套522的配合对盘片501定位。在轴套522与夹紧机构541相对的面(图69(a)中的上面)的中央形成定位孔523。对置磁轭524埋设固定于轴套522。The sleeve 522 that fits with the clamping hole 512 of the disc 501 is integrally formed with the turntable 216 . The disc 501 is positioned by utilizing the cooperation between the clamping hole 512 of the disc 501 and the sleeve 522 . A positioning hole 523 is formed in the center of the surface (the upper surface in FIG. 69( a )) of the boss 522 that faces the clamp mechanism 541 . The opposing yoke 524 is embedded and fixed on the sleeve 522 .

在夹紧机构541中，磁铁夹套543上固定有中心突起546，用来与转台216设置的定位孔523配合以确保转台216和夹紧机构541在同一中心位置。在该中心突起546周围固定有磁铁544和后磁轭545。在构成夹紧机构541底面的盘片夹套542的底面形成平坦的面。In the clamping mechanism 541 , a central protrusion 546 is fixed on the magnet jacket 543 for cooperating with the positioning hole 523 provided on the turntable 216 to ensure that the turntable 216 and the clamping mechanism 541 are at the same central position. A magnet 544 and a rear yoke 545 are fixed around the center protrusion 546 . A flat surface is formed on the bottom surface of the disc chuck 542 constituting the bottom surface of the clamp mechanism 541 .

在如上构成的第19实施例盘片驱动装置中，当盘片501由夹紧机构541和转台521经转台用橡胶薄片571处于夹紧状态下，盘片501通过夹紧孔512与轴套522的配合，安装在转台216上。此时，盘片501通过作用于包含在夹紧机构541内的磁铁544与固定于转台216的对置磁轭524之间的吸引磁力而被保持住。这样保持住的盘片501随主轴电动机502的旋转而与转台216及夹紧机构541作整体旋转。In the disk drive device of the nineteenth embodiment constituted as above, when the disk 501 is clamped by the clamping mechanism 541 and the turntable 521 via the rubber sheet 571 for the turntable, the disk 501 passes through the clamping hole 512 and the shaft sleeve 522 The fit is installed on the turntable 216. At this time, the disk 501 is held by the attractive magnetic force acting between the magnet 544 included in the clamp mechanism 541 and the opposing yoke 524 fixed to the turntable 216 . The disc 501 thus held rotates integrally with the turntable 216 and the clamp mechanism 541 as the spindle motor 502 rotates.

第19实施例的盘片驱动装置如图69(b)所示，在构成树脂制夹紧机构541底面的盘片夹套542的底面形成有圆柱形的4个夹紧机构突起551。夹紧机构突起551配置在以磁铁支座543的中心突起546为中心的圆上，设置在夹紧机构突起551确实能压紧住盘片501的夹紧区511的位置上。夹紧机构突起551设置在将以中心突起546为中心的圆周4等分的位置，也即，等间隔设置在每隔90度分割的位置。In the disk drive device of the nineteenth embodiment, as shown in FIG. 69(b), four cylindrical clamp protrusions 551 are formed on the bottom surface of a disc jacket 542 constituting the bottom surface of a resin clamp 541. The clamping mechanism protrusion 551 is arranged on a circle centered on the central protrusion 546 of the magnet support 543 , and is arranged at a position where the clamping mechanism protrusion 551 can indeed press the clamping area 511 of the disc 501 . The clamping mechanism protrusions 551 are provided at positions that divide the circumference centered on the central protrusion 546 into four equal parts, that is, at equal intervals at positions divided by 90 degrees.

各夹紧机构突起551的高度(h1)差(平面度)规定在40μm范围内。如果在该范围内，则利用4个夹紧机构突起551和经过转台用橡胶薄片571与转台216能可靠地夹紧住盘片501。The height (h1) difference (flatness) of each clamping mechanism protrusion 551 is specified within the range of 40 μm. Within this range, the disc 501 can be securely clamped by the four clamping mechanism protrusions 551 and the rubber sheet 571 passing through the turntable and the turntable 216 .

在第19实施例盘片驱动装置中，盘片501通过金属制转台216的转台用橡胶薄片571放置于转台521上。盘片放置面216a中凹凸的高度差(平面度)取决于转台521的加工方法。假定转台216是由铝或黄铜棒切削形成，则容易实现20μm以内的平面度，但加工时间长，成本高。与此相反，冲裁金属板制成的转台216能实现低成本，但要将盘片放置面216a的平面度作到100μm以下是困难的。这样一来，结果在盘片放置面216a平面度差的转台216上，变成以3点夹紧盘片501。In the disk drive apparatus of the nineteenth embodiment, the disk 501 is placed on the turntable 521 through the turntable rubber sheet 571 of the metal turntable 216 . The height difference (flatness) of the concavities and convexities in the disk placement surface 216 a depends on the processing method of the turntable 521 . Assuming that the turntable 216 is formed by cutting an aluminum or brass rod, it is easy to achieve a flatness within 20 μm, but the processing time is long and the cost is high. On the contrary, the turntable 216 made of punched metal plate can realize low cost, but it is difficult to make the flatness of the disk placement surface 216a to be 100 μm or less. As a result, the disk 501 is clamped at three points on the turntable 216 having a poor flatness of the disk placement surface 216a.

转台216的平面度在100μm以上，即使设置4个夹紧机构突起551来限制盘片501向夹紧机构541侧可变形的范围，但向转台216侧可变形范围变大。因此，盘片501高速旋转情况下，在盘片501会产生如前述图47所示那样的“6等分模式”的大的振动，盘片驱动装置的振动、噪声会急增。The flatness of the turntable 216 is above 100 μm. Even if four clamping mechanism protrusions 551 are provided to limit the deformable range of the disc 501 toward the clamping mechanism 541 side, the deformable range toward the turntable 216 side becomes larger. Therefore, when the disk 501 rotates at a high speed, a large vibration in the "sixth mode" as shown in FIG. 47 is generated on the disk 501, and the vibration and noise of the disk drive device increase rapidly.

然而，在第19实施例的盘片驱动装置中，通过将转台用橡胶薄片571贴附于转台216，能吸收金属板制转台216的凹凸。However, in the disk drive device of the nineteenth embodiment, by affixing the rubber sheet 571 for the turntable to the turntable 216, unevenness of the turntable 216 made of a metal plate can be absorbed.

例如，根据不同的橡胶硬度，形成厚度为0.1~1.0mm的硬度为20～80度的转台用橡胶薄片571。如果盘片501的夹紧区511的直径为30mm左右，则一片转台用橡胶薄片571形成的厚度误差容易达到100μm以下。用粘接剂或两面胶带将这种转台用橡胶薄片571贴附于转台216上。由于转台用橡胶薄片571具有橡胶弹性，因此利用转台用橡胶薄片571的形变很容易吸收转台216的100μm左右的凹凸不平。For example, a rubber sheet 571 for a turntable with a thickness of 0.1 to 1.0 mm and a hardness of 20 to 80 degrees is formed according to different rubber hardnesses. If the diameter of the clamping area 511 of the disk 501 is about 30 mm, the thickness error formed by the rubber sheet 571 for a turntable is likely to be less than 100 μm. This turntable rubber sheet 571 is attached to the turntable 216 with an adhesive or a double-sided tape. Since the rubber sheet 571 for the turntable has rubber elasticity, the unevenness of about 100 μm of the turntable 216 can be easily absorbed by the deformation of the rubber sheet 571 for the turntable.

在将盘片501放置于贴附有这样的转台用橡胶薄片571的转台216的情况下，盘片501向转台216侧的变形受到限制。由于转台用橡胶薄片571具有弹性，故在转台用橡胶薄片571的最外周多少有变形。然而，因橡胶的压缩应力急剧上升，故在转台用橡胶圈571的内周侧完全不变形。因此，盘片501在夹紧区511的内侧360度一圈上完全被束缚。因而即使盘片501高速旋转，盘片501也不发生“6等分模式”、“8等分模式”等的振动。When the disk 501 is placed on the turntable 216 to which such a turntable rubber sheet 571 is attached, deformation of the disk 501 toward the turntable 216 side is restricted. Since the rubber sheet 571 for a turntable has elasticity, the outermost periphery of the rubber sheet 571 for a turntable is somewhat deformed. However, since the compressive stress of the rubber rises sharply, the inner peripheral side of the rubber ring 571 for a turntable is not deformed at all. Thus, the disk 501 is fully bound on the inner 360 degree turn of the clamping area 511 . Therefore, even if the disk 501 rotates at a high speed, the disk 501 does not vibrate in the "sixth mode", "eighth mode" or the like.

如上所述，第19实施例盘片驱动装置利用在转台216贴附转台用橡胶薄片571，能吸收金属板制转台216大的凹凸不平。在第19实施例盘片驱动装置中，在用切削铝或黄铜制成的转台216上贴附转台用橡胶薄片571的情况，与金属板制转台的情况相比，能进一步吸收转台216的凹凸。因此，按照第19实施例盘片驱动装置，能大幅度减小盘片501高速旋转时的盘片501的振动。As described above, the disk drive device of the nineteenth embodiment can absorb large unevenness of the turntable 216 made of a metal plate by attaching the rubber sheet 571 for the turntable to the turntable 216 . In the disk drive device of the nineteenth embodiment, when the rubber sheet 571 for the turntable is attached to the turntable 216 made of cut aluminum or brass, the vibration of the turntable 216 can be absorbed more than when the turntable is made of a metal plate. Bump. Therefore, according to the disk drive apparatus of the nineteenth embodiment, the vibration of the disk 501 when the disk 501 rotates at a high speed can be greatly reduced.

在第19实施例的盘片驱动装置中，若各转台突起551的高度(h1)差(平面度)在40μm范围内，则用4个以上的夹紧机构突起551能可靠地夹紧盘片501的夹紧区511。最好是能使转台突起551的平面度在20μm范围内，则用转台216和夹紧机构541能更可靠地夹紧盘片501，能进一步减小盘片501高速旋转时的振动。In the disc drive device of the nineteenth embodiment, if the height (h1) difference (flatness) of the turntable protrusions 551 is within the range of 40 μm, the disc can be reliably clamped by more than four clamping mechanism protrusions 551. 501 of the clamping area 511 . It is preferable to make the flatness of the turntable protrusion 551 within 20 μm, then the turntable 216 and the clamping mechanism 541 can clamp the disc 501 more reliably, and further reduce the vibration of the disc 501 when it rotates at high speed.

第19实施例的盘片驱动装置中，以夹紧机构突起551的形状为圆柱形进行了说明，但是，本发明中夹紧机构突起551的水平剖面形状未必要圆形，可设定为三角形、四边形、椭圆形等自由剖面形状。再有，夹紧机构突起551的前端与前述第14实施例的一样，使前端变小，能获得与第14实施例相同的效果。In the disk drive device of the nineteenth embodiment, the shape of the clamping mechanism protrusion 551 is described as a cylinder, but in the present invention, the horizontal cross-sectional shape of the clamping mechanism protrusion 551 is not necessarily circular, and may be set as a triangle. , quadrilateral, ellipse and other free cross-sectional shapes. In addition, the front end of the clamping mechanism protrusion 551 is the same as that of the aforementioned fourteenth embodiment, and the front end is made smaller, so that the same effect as that of the fourteenth embodiment can be obtained.

第19实施例的盘片驱动装置，结构上是在夹紧机构541侧设置4个夹紧机构突起551，将转台用橡胶薄片571贴附于转台216，盘片501在夹紧区511的内侧360度一圈上完全被约束。然而，如图70(a)和(b)所示，结构上也可在转台212形成4个转台突起552，将夹紧机构用橡胶薄片572贴附于夹紧机构416，也能可靠夹紧盘片501。利用这种结构也能减小盘片501高速旋转时的盘片501的振动。The disk driving device of the nineteenth embodiment is structurally provided with four clamping mechanism protrusions 551 on the side of the clamping mechanism 541, and the rubber sheet 571 for the turntable is attached to the turntable 216, and the disk 501 is inside the clamping area 511. Fully constrained on a 360 degree circle. However, as shown in Figure 70 (a) and (b), four turntable protrusions 552 can also be formed on the turntable 212 structurally, and the rubber sheet 572 for the clamping mechanism can be attached to the clamping mechanism 416, and the clamping mechanism can also be reliably clamped. Disc 501. Also with this structure, the vibration of the disk 501 when the disk 501 rotates at a high speed can be reduced.

如图71(a)和(b)所示，即使结构上将转台用橡胶薄片571贴附于转台216，将夹紧机构用橡胶薄片572贴附于夹紧机构416，也能可靠夹紧盘片501。利用这种结构，也能减小盘片501高速旋转时的盘片501的振动。As shown in Figure 71 (a) and (b), even if the rubber sheet 571 for the turntable is attached to the turntable 216 structurally, and the rubber sheet 572 for the clamping mechanism is attached to the clamping mechanism 416, the disk can be reliably clamped. Sheet 501. Also with this structure, the vibration of the disk 501 when the disk 501 rotates at a high speed can be reduced.

在第19实施例的盘片驱动装置中，取图69中夹紧机构突起551和图70中转台突起552的个数分别为4个进行了说明。但是，本发明与前述第14实施例的盘片驱动装置情况相同，若构成6个、9个或9个以上，则相应能更进一步减小盘片501高速旋转时的振动。In the disk drive device of the nineteenth embodiment, the number of clamping mechanism protrusions 551 in FIG. 69 and the number of turntable protrusions 552 in FIG. 70 are described as four. However, the present invention is the same as the disk drive device of the aforementioned fourteenth embodiment. If there are 6, 9 or more disk drives, the vibration when the disk 501 rotates at a high speed can be further reduced accordingly.

在第19实施例的盘片驱动装置中，虽然没有安装图62所示第17实施例中的平衡器561，但在如图69、70、及图71所示的夹紧机构541、416安装平衡器561，也能抵消旋转时盘片501偏心产生的失衡。此外，将平衡器561安装于夹紧机构541、416，也不会影响抵消盘片高速旋转时“6等分模式”、“8等分模式”等的振动的效果。In the disk drive device of the nineteenth embodiment, although the balancer 561 in the seventeenth embodiment shown in FIG. 62 is not installed, it is installed in the clamping mechanisms 541, 416 shown in FIGS. The balancer 561 can also offset the imbalance caused by the eccentricity of the disc 501 during rotation. In addition, the installation of the balancer 561 on the clamping mechanisms 541 and 416 will not affect the effect of canceling the vibration of the "sixth mode" and "eighth mode" when the disk rotates at high speed.

在第19实施例的盘片驱动装置的图69、70、及图71中，取转台用橡胶薄片571、夹紧机构用橡胶薄片572为圆环状，但只要是同一厚度的橡胶薄片，即使将橡胶薄片分割成多片，也能获得同样的效果。In FIGS. 69, 70, and 71 of the disc drive device of the nineteenth embodiment, the rubber sheet 571 for the turntable and the rubber sheet 572 for the clamping mechanism are ring-shaped, but as long as they are rubber sheets of the same thickness, even The same effect can also be obtained by dividing the rubber sheet into multiple pieces.

第19实施例构成的盘片驱动装置，其夹紧机构541、416内含有磁铁544和后磁轭545，对置磁轭524埋设在转台521、216的轴套522中。但是，其构成也可以改为使转台521、216的轴套522内含有磁铁544和后磁轭545，夹紧机构541、416内含有对置磁轭524，也一定具有减小盘片501高速旋转时振动的效果。In the disk drive device according to the nineteenth embodiment, the clamping mechanisms 541, 416 include magnets 544 and rear yokes 545, and the opposing yokes 524 are embedded in the sleeves 522 of the turntables 521, 216. But its structure also can change to make the axle sleeve 522 of turntable 521,216 contain magnet 544 and rear yoke 545, and clamping mechanism 541,416 contains opposite yoke 524, also must have the function of reducing the high speed of disk 501. The effect of vibration when rotating.

如上所述，在第19实施例的盘片驱动装置中，利用在转台216的盘片放置面贴附转台用橡胶薄片571的结构，或利用在夹紧机构416的盘片压紧面上贴附夹紧机构用橡胶薄片572的结构，能可靠减小盘片501的振动。由此，第19实施例的盘片驱动装置，在将盘片501放置在有振摆的转台上并高速旋转情况下，或在盘片501有振摆或严重失衡的盘片501高速旋转的情况下，也能减小盘片501的振动。因此，按照第19实施例的盘片驱动装置，能不降低数据的传送速率进行稳定的记录重放。另外，第19实施例的盘片驱动装置，能减小对盘片驱动装置外部造成的振动或噪声，同时能实现延长主轴电动机502的寿命。As described above, in the disk drive device of the nineteenth embodiment, the rubber sheet for turntable 571 is attached to the disk placement surface of the turntable 216, or the rubber sheet 571 for the turntable is attached to the disk pressing surface of the clamp mechanism 416. The structure with the rubber sheet 572 for the clamping mechanism can reliably reduce the vibration of the disc 501 . Thus, in the disk drive device of the nineteenth embodiment, when the disk 501 is placed on a wobbling turntable and rotates at a high speed, or when the disk 501 has wobble or is seriously unbalanced and the disk 501 is rotated at a high speed In this case, the vibration of the disk 501 can also be reduced. Therefore, according to the disk drive device of the nineteenth embodiment, stable recording and reproduction can be performed without reducing the data transfer rate. In addition, in the disk drive device of the nineteenth embodiment, vibration and noise to the outside of the disk drive device can be reduced, and at the same time, the life of the spindle motor 502 can be prolonged.

如上所述，按照本发明第14至第19实施例的盘片驱动装置，为了夹紧盘片的夹紧区，从而在夹紧机构的盘片压紧面或转台的盘片放置面形成4个以上的突起。由此，第14至第19实施例的盘片驱动装置能获得旋转时有振摆、有失衡的盘片高速旋转时减小盘片振动的效果。As described above, according to the disc driving apparatuses of the fourteenth to nineteenth embodiments of the present invention, in order to clamp the clamping area of the disc, 4 are formed on the disc pressing surface of the clamp mechanism or the disc placement surface of the turntable. more than one protrusion. Thus, the disk drive apparatuses of the fourteenth to nineteenth embodiments can achieve the effect of reducing the vibration of the disk when the disk with wobble or unbalance rotates at a high speed.

按照本发明，因有上述效果，故能实现盘片即使高速旋转也能稳定地记录重放数据、能高速数据传送的盘片驱动装置。According to the present invention, due to the above effects, it is possible to realize a disk drive device capable of stably recording and reproducing data even when the disk rotates at a high speed, and capable of high-speed data transfer.

按照本发明，能大幅度地减小对盘片驱动装置外部产生的振动或该振动引起的噪声。According to the present invention, it is possible to greatly reduce the vibration generated outside the disk drive unit or the noise caused by the vibration.

虽然以较佳实施例在某种程度上较详细地说明了本发明，但该较佳实施例所揭示的内容在结构细节方面理所当然会有变化，各构件的组合或顺序的变化在不脱离本发明权利要求的范围及构思是能够实现的Although the present invention has been described in detail to a certain extent with a preferred embodiment, the content disclosed in the preferred embodiment will naturally change in terms of structural details, and the combination or sequence of each component can be changed without departing from the present invention. The scope and concept of the invention claims can be realized

工业上的可应用性Industrial Applicability

本发明可应用于对个人计算机、游戏机、录像重放机、及网络或卫星广播等的信息加以运用的装置(机顶盒)，用于使作为记录媒体的盘片高速旋转时的数据记录或重放。The present invention can be applied to devices (set-top boxes) that use information such as personal computers, game machines, video playback machines, and Internet or satellite broadcasts, and are used for recording or reproducing data when a disk as a recording medium is rotated at high speed. put.

Claims

1. a disc drive appts is characterized in that, comprising:

Leaning on difference in height separately is 4 the turntables with upper process support disc sheet of flatness in 40 mu m ranges, and

Have separately difference in height and be flatness 4 in 40 mu m ranges with upper process, clamp the clamp system of described disc by the projection of this projection and described turntable;

The projection of described turntable and the projection of described clamp system are arranged at relative position.

2. disc drive appts as claimed in claim 1 is characterized in that, comprising:

The subbase of fixed disc rotation drive motor;

Assemble the main base of described subbase by elastic body; And

Have annular orbit and be removably set on equalizing feature on this annular orbit, and be arranged to can with the evener of disc one rotation.

3. disc drive appts as claimed in claim 1 is characterized in that, described projection be configured in the coaxial circumference of disc rotation center on.

4. disc drive appts as claimed in claim 1 is characterized in that, described projection is configured on the circumference with the coaxial different radii of disc rotation center.

5. a disc drive appts is characterized in that, comprising:

On the face of putting the recording medium disc, elastomeric turntable is set; And

Have separately difference in height and be flatness 4 in 40 mu m ranges with upper process, clamp the clamp system of described disc by described projection and described turntable.

6. a disc drive appts is characterized in that, comprising:

Leaning on difference in height separately is 4 the turntables with upper process support disc sheet of flatness in 40 mu m ranges; And

Elastic body is set compressing on the face of described disc, clamps the clamp system of described disc by described elastic body and described turntable.

7. as claim 5 or 6 described disc drive appts, it is characterized in that described elastic body is a rubber sheet.