JP2003263856A - Disk drive device and method of assembling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce vibration of a spindle system including a disk which is air-excited by high-speed rotation of a disk device, and in particular, to narrow a data track interval in a magnetic disk device. . A ring-shaped member (12) having a spindle hub (2) on which an information recording disk is mounted rotatably supported by a housing (43) and having a surface facing a bottom surface (2d) of the spindle hub (2).
Is provided on the housing 43, and the bottom surface 2d of the spindle hub 2 and the surface 12b of the ring-shaped member 12 opposed thereto constitute squeeze air bearing plates 2e and 12b. This allows
Vibration damping force can be obtained by viscous resistance force corresponding to the vibration of the bottom surface 2d of the spindle hub 2, and the vibration of the disk drive device and thus the vibration of the disk can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device, and in particular, it reduces disk vibration due to air excitation force due to high speed disk rotation of an information recording disk,
The present invention relates to a disk drive device capable of achieving high recording density.

[0002]

2. Description of the Related Art FIG. 19 is a perspective view showing a structure widely used in a magnetic disk device. One disk 1 which is responsible for information recording and storage is fixed to a spindle hub 2 which is rotated by a rotation driving device 5, or a plurality of disks 1 are laminated and fixed at equal intervals via spacers. Magnetic head 4 for recording and reproducing information
1 is rotatably arranged on both sides or one side of the disc 1. When the rotation driving device 5 rotates, the magnetic head 41 slightly floats above the disk 1 due to the air flow generated between the surface of the disk 1 and the magnetic head 41. The magnetic head 41 is fixed to the tip of an actuator 45, and a coil 47 of a voice coil motor 46 is provided at the other end of the actuator 45. On the other hand, the magnetic head 41 is rotated about the actuator rotation center shaft 45a by the driving force of the voice coil motor 46, and is movable in the radial direction on the disk 1. Data is recorded as magnetic information on data tracks that are drawn concentrically on the disk 1, and the rotation of the rotation driving device 5, that is, the rotation of the disk 1 and the magnetic head 41.
The rotation of allows the magnetic head 41 to access any position on any data track.

In order to read and write data accurately, the magnetic head 41 needs to follow the data track accurately. The magnetic head 41 follows the data track by detecting the current position from servo information discretely drawn at a plurality of positions on the data track at equal angular intervals, and moving the actuator 45 in the direction to correct the deviation from the data track. This is performed by moving the magnetic head 41. Magnetic head 4
The flying height of No. 1 is about several tens of nm, and the presence of dust between the magnetic head 41 and the disk 1 damages the magnetic head 41 and the disk 1 and causes a failure. Assembly is performed in a clean room, and after assembly, it is sealed with a cover and an airtight member.

The information recording apparatus is required to have various characteristics such as large capacity (high density), high transfer rate, high reliability, low power consumption, low cost, small size, light weight and portability. The magnetic disk device has an advantage in that it is convenient for users, particularly in terms of capacity and transfer speed, and is indispensable for computers and the like. It is considered that the capacity and the speed will be further increased in the future, that is, the density and the speed will be further increased. Along with that, the data track interval is narrowed and the disk drive is rotated at high speed, which is a promising means for realizing each of them. Will continue to progress in the future.

In order to realize a narrow data track interval, it is necessary to improve the positioning accuracy of the magnetic head 41 on the data track. The predominant factor that hinders high-accuracy positioning is the shake of the rotary drive device 5 and the disk 1, and its reduction is required. Among them, the problems that arise are asynchronous rotation shake due to the bearing of the rotary drive device 5, natural vibration of the spindle system including the spindle hub 2, and resonance caused by matching of their frequencies.

Among these, the asynchronous rotation runout of the bearing can be greatly reduced by using a fluid bearing whose mass production system has been established in recent years. Even in the case of ball bearings, non-synchronous runout is decreasing year by year due to improvement in processing technology.

Resonance between the asynchronous rotational runout of the ball bearing and the natural vibration of the spindle system can be almost avoided by design, and can be improved by using a fluid bearing.

In order to reduce the shake due to the natural vibration of the spindle system, it is necessary to reduce the exciting force or to have a structure in which the shake does not occur with respect to the exciting force. When the rotary drive device 5 rotates, the air in the vicinity thereof and the air between the plurality of disks 1 also rotate. When the rotation of the rotary drive device 5 becomes high speed, the air flow generated becomes high speed and turbulence and vortex are generated. As a result, a time-varying unsteady pressure difference occurs in the vicinity of the disk 1, and the air excitation force based on this causes a large factor in exciting the natural vibration of the spindle system including the disk 1. As described above, the rotational speed of the disk drive tends to increase due to the increase of the transfer speed, so that the air exciting force also increases. In this way, the reduction of shake due to the natural vibration of the spindle system and the high-speed rotation of the disk drive, that is, the narrowing of the data track interval and the high-speed rotation of the disk drive have opposite directions, and it is difficult to achieve both at the same time. Is a technical issue.

As one of the methods for reducing the shake due to the natural vibration of the spindle system with respect to the air exciting force in the conventional magnetic disk apparatus, a squeeze air in which a smooth surface is installed opposite to the surface of the disk 1 with a minute gap therebetween. Bearing plates have been proposed.

FIG. 20 is a sectional view showing the structure of a squeeze air bearing plate in a conventional magnetic disk device.
The squeeze air bearing plate 11 is fixed to the housing 43. Squeeze air bearing surface 1 facing the disk 1
Reference numeral 1a is a smooth surface parallel to the surface of the disk 1 and faces the surface of the disk 1 with a minute gap maintained between the smooth surface and the surface of the disk 1. Squeeze air bearing surface 1
1a is opposed to the disk 1 not in the entire surface of the disk 1 but in a partial area from the vicinity of the middle circumference to the outer circumference of the disk 1 in the radial direction. Further, it is often provided partially in the circumferential direction as well, but this is dimensional in terms of avoiding the rotation area of the magnetic head 41 shown in FIG. Due to restrictions and the like, the aspect of the partial region varies depending on the design. Further, the squeeze air bearing surface 11a may be provided so as to correspond to the surfaces of all of the plurality of discs 1, or may be provided so as to correspond to only the surface of any one disc 1.

The operation of the squeeze air bearing surface 11a is as follows.
It is as follows. That is, in response to the vibration of the disk 1, the air flowing between the surface of the disk 1 and the squeeze air bearing surface 11a facing the disk 1 tries to move, and the viscous resistance force at that time causes the disk 1 and It works as the main force to suppress the vibration of the spindle system.

[0012]

In order to enhance the effect of reducing the vibration of the disk 1 by using such a squeeze air bearing plate 11, the distance between the squeeze air bearing surface 11a and the surface of the disk 1 is reduced. The position where the squeeze air bearing surface 11a and the surface of the disk 1 face each other may be set to a position where the vibration speed is high, and the area where the squeeze air bearing surface 11a faces the surface of the disk 1 may be widened.

However, regarding the distance between the squeeze air bearing surface 11a and the surface of the disk 1 in the above-mentioned conventional example, depending on the improvement of the machining accuracy of the parts to reduce the distance increases the cost, so that the price competition. This is an unacceptable method in the information equipment industry where power is important. In the magnetic disk device, most of the surface of the disk 1 is a data area, and if the disk 1 contacts the squeeze air bearing surface 11a, the data of the disk 1 rotating at high speed will be destroyed.

If the gap between the two is guaranteed by design, the value will differ depending on the diameter of the disc and the number of laminated layers.
For example, when the squeeze air bearing plate 11 is provided only on the disk 1 of the 3.5-inch disk 1 which is closest to the housing, the industrially realizable gap is about 0.3 mm. This value is the dimensional error between the disk receiving surface of the spindle hub 2 and the squeeze air bearing plate mounting surface of the housing 43, the dimensional error between the squeeze air bearing surface 11a of the squeeze air bearing plate 11 and the housing mounting surface, and the spindle hub. 2 the inclination of the disc receiving surface and the accompanying inclination of the disc 1, the warp of the disc 1 due to the clamping of the disc 1, the deformation of the disc 1, the squeeze air bearing plate 11 and the housing 43 at the time of vibration / impact, etc. Is set in consideration.

As mentioned above, the squeeze air bearing surface 1
Since the position where 1a faces the surface of the disc 1 is often provided from the vicinity of the middle circumference to the outer circumference of the disc 1, the squeeze air bearing surface 11a and the surface of the disc 1 face each other at a position where the vibration speed of the disc 1 is high. It is possible. However, with such a configuration, as described above, the inclination of the disk 1 and the amount of deformation at the time of vibration / impact become large, so that the gap between the surface of the disk 1 and the squeeze air bearing surface 11a must be large. There is a disadvantage that it must be done.

The area in which the squeeze air bearing surface 11a faces the surface of the disk 1 is limited by dimensions such as avoiding the rotating area of the magnetic head 41 and securing a space for installation on the housing 43. It can only be partially provided in the circumferential direction. Under the condition that the dimensions of other parts are not sacrificed in this way, a value that can be achieved is, for example, about 45 ° to 200 °.
However, the value of about 200 ° is a value applicable only to the surface of the disc 1 facing the housing 43, and 90 ° when the squeeze air bearing plate 11 is inserted in the gap between the discs 1. The degree is the limit that can be realized.

If the squeeze air bearing surface 11a is made to face the surface of all the disks 1, the damping effect is increased in principle. However, in reality, the distance between the disks 1 of the current magnetic disk device may be smaller than 2 mm, and the thickness of the squeeze air bearing plate 11 itself is 1 mm.
The squeeze air bearing plate 11 itself vibrates because it can be formed to a thin thickness of only slightly over a millimeter, and only a small effect can be obtained. Further, finishing the squeeze air bearing surface 11a of the squeeze air bearing plate 11 formed in a comb shape corresponding to the plurality of discs 1 to be a smooth surface itself leads to a large cost increase. On the other hand, in order to facilitate the processing of the smooth surface forming the air bearing surface 11a, the smooth surface is formed into a separate piece made of a flat plate for surface finishing, and then the comb-shaped squeeze air bearing plate 11 is formed. It can be assembled, but in this case, the dimensional error between the squeeze air bearing surface 11a and the mounting surface of the squeeze air bearing plate 11 to the housing 43 becomes large, and the disc 1 and the squeeze air bearing surface 1
It becomes necessary to increase the gap with 1a, and the squeeze effect is reduced.

In this way, the squeeze air bearing plate 11
The structure of has a lot of room for improvement in order to obtain a larger damping effect or to reduce the cost. SUMMARY OF THE INVENTION It is therefore an object of the present invention to reduce the vibration of a spindle system including a disk that is air-excited by high-speed rotation, and particularly to realize a narrow data track interval in a magnetic disk device.

[0019]

In order to achieve this object, a disk drive device of the present invention rotatably supports a spindle hub on which an information recording disk is mounted in a housing, and the surface of the spindle hub is the same as that of the spindle hub. A ring-shaped member facing the bottom surface is provided in the casing, and the bottom surface of the spindle hub and the surface of the ring-shaped member facing the squeeze air bearing are configured.

According to this, as compared with the case where the air bearing plate is opposed to the information recording disk, the disk tilts due to the tilt of the disk receiving surface of the spindle hub, the disk warp due to clamping, and the disk shock due to vibration impact. Since it is not affected by surface runout of the disk due to deformation, the axial gap between the surface of the ring-shaped member and the bottom surface of the spindle hub can be significantly reduced.
Moreover, since there are no obstacles, a large damping effect can be obtained in the entire area of one round.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disk drive apparatus according to the present invention as set forth in claim 1 rotatably supports a spindle hub on which an information recording disk is mounted in a housing, and a surface thereof faces a bottom surface of the spindle hub. Such a ring-shaped member is provided on the housing, and the squeeze air bearing is constituted by the bottom surface of the spindle hub and the surface of the ring-shaped member facing the bottom surface.

According to this, as compared with the case where the air bearing plate is opposed to the information recording disk, the disk tilts due to the tilt of the disk receiving surface of the spindle hub, the disk warp due to clamping, and the disk shock due to vibration impact. Since it is not affected by surface runout of the disk due to deformation, the axial gap between the surface of the ring-shaped member and the bottom surface of the spindle hub can be significantly reduced.
Moreover, since there are no obstacles, a large damping effect can be obtained in the entire area of one round. As a result, it is possible to increase the vibration damping force of the disk drive device based on the action of the fluid force, and thus to reduce the vibration of the disk drive device and eventually the disk.

According to a second aspect of the present invention, there is provided a disk drive device in which a viscoelastic member is provided between the ring-shaped member and the housing. According to this, the vibration of the ring-shaped member and the housing that responds to the vibration of the disk drive device can be reduced by the viscoelastic member.

According to a third aspect of the present invention, there is provided a disk drive device in which a ring-shaped member is integrally formed with a housing. According to this, it is possible to reduce the number of parts and the cumulative value of the component dimensional error due to this, and it is possible to reduce the gap between the surface of the ring-shaped member and the bottom surface of the spindle hub. As a result, it is possible to reduce the vibration of the disk drive device and eventually the disk based on the increase of the damping force of the disk drive device due to the fluid force.

According to a fourth aspect of the present invention, there is provided a disk drive device in which a ring-shaped member is fixed to a housing with its axial position adjusted with respect to the bottom surface of the spindle hub. Is.

According to this, the gap between the surface of the ring-shaped member and the bottom surface of the spindle hub can be set to about several tens of μm without increasing the precision of the parts. It is possible to reduce the disk vibration based on the increase of the damping force of the disk.

According to a fifth aspect of the present invention, in the disk drive device of the present invention, the ring-shaped member has a held portion, and the housing moves the ring-shaped member while holding the held portion. The holding member has a hole through which a holding means that can position the member in the axial direction passes.

According to this, the holding means is inserted into the inside of the housing from the outside of the housing through the hole, and the held portion of the ring-shaped member is held by the holding means, so that the ring-shaped member is placed on the bottom surface of the spindle hub. The position can be easily adjusted in the axial direction.

According to a sixth aspect of the present invention, there is provided a method of assembling a disk drive device, wherein a spindle hub on which an information recording disk is mounted is rotatably supported in a housing, and a surface of the spindle hub faces a bottom surface of the spindle hub. A ring-shaped member is provided on the housing, and when assembling a disk drive device that constitutes a squeeze air bearing with the bottom surface of the spindle hub and the surface of the ring-shaped member facing it, the bottom surface of the spindle hub and this After bringing the surfaces of the ring-shaped members facing each other into contact with each other, the ring-shaped members are moved in the axial direction to provide a predetermined amount of axial gap between the two facing surfaces.

With this arrangement, the gap between the surface of the ring-shaped member and the bottom surface of the spindle hub can be set to about several tens of μm without having to improve the precision of the parts, which allows the disk drive by the fluid force. It is possible to reduce the disk vibration due to the increase of the damping force of the device.

According to a seventh aspect of the present invention, there is provided a disk drive device, which is provided between a ring-shaped member and a casing and is compressed so as to bring the surface of the ring-shaped member into contact with the bottom surface of the spindle hub. This ring-shaped member has a compressible member capable of generating a directional force, and the ring-shaped member is moved and fixed in the axial direction after being brought into contact with the bottom surface of the spindle hub by the axial force of the compressible member. It is configured such that a predetermined amount of axial clearance can be provided between the surface of the member and the bottom surface of the spindle hub.

According to this method, the surface of the ring-shaped member is brought into surface contact with the bottom surface of the spindle hub in advance by using a compressible member, so that the surface of the ring-shaped member is brought into surface contact with the bottom surface of the spindle hub. Can be omitted, and disk vibration can be easily reduced.

According to the disk drive device of the present invention described in claim 8, the held portion is formed by a convex portion or a concave portion. According to this, the ring-shaped member can be easily and accurately positioned, and the vibration of the disk can be reduced.

According to a ninth aspect of the present invention, there is provided a disk drive device in which the held portion is made of a magnetic material or a magnet. According to this, the magnetic material portion or the magnet portion forming the held portion of the ring-shaped member is
Since it can be supported and held by a magnet or a magnetic material, accurate positioning of the ring-shaped member can be easily performed, and vibration of the disk can be reduced.

According to a tenth aspect of the present invention, in the disk drive device of the present invention, the ring-shaped member has a held portion, and the housing moves the ring-shaped member while holding the held portion. The compressible member has a hole through which a holding means that can position the member in the axial direction is passed, and the compressible member can seal the periphery of the hole.

According to this, it is possible to provide a disk drive device which can save the labor for sealing the hole with an adhesive or a seal and can easily reduce the vibration of the disk.
In the disk drive device of the present invention according to claim 11, a feed screw is screwed onto a ring-shaped member, and the ring-shaped member is axially positioned with respect to the bottom surface of the spindle hub by rotation of the feed screw. Is configured to be adjusted.

According to this, the gap between the surface of the ring-shaped member and the bottom surface of the spindle hub can be finely adjusted only by rotating the feed screw. Therefore, the ring-shaped member is held to adjust the gap. It is possible to eliminate the need for equipment for precision movement in this state.

According to the twelfth aspect of the present invention, in the disk drive device of the present invention, the feed screw and the ring-shaped member are adjusted in a state where the position of the ring-shaped member is axially adjusted with respect to the bottom surface of the spindle hub by the rotation of the feed screw. At least one of the above is fixed to the housing.

According to this, the ring-shaped member can be fixed in the positioned state, and therefore, the disk vibration can be reduced due to the increase of the damping force of the disk drive device due to the fluid force.

According to a thirteenth aspect of the present invention, there is provided a method of assembling a disk drive device, wherein after two opposing surfaces are brought into contact with each other, a ring-shaped member is moved by a certain amount in the axial direction to provide a gap in the axial direction, After that, contact detection of the two surfaces is performed, and if they are in contact, a certain amount of axial movement and contact detection of the ring-shaped member are further performed, and this is repeated until the contact disappears.

In this way, it is possible to provide a minimum gap according to each product, and the disk vibration caused by the increase of the vibration damping force of the disk drive device by the stable fluid force with little variation. Reduction can be realized.

According to a fourteenth aspect of the present invention, in the method for assembling the disk drive device, after the surface of the ring-shaped member and the bottom surface of the spindle hub are not in contact with each other, the ring-shaped member is further axially moved by a predetermined amount. In the axial direction to increase the axial gap between the two opposing surfaces.

In this way, even if there is a deformation due to heat after assembly or a reduction in the gap due to disturbance during use,
It is possible to prevent contact between the surface of the ring-shaped member and the bottom surface of the spindle hub, and highly reliable reduction of disk vibration can be realized.

According to a fifteenth aspect of the present invention, there is provided a method for assembling a disk drive device, wherein contact between two surfaces is detected by detecting a rotational torque of the spindle hub when the spindle hub is not rotationally driven. Is.

In this way, highly reliable reduction of disk vibration can be realized without providing a special sensor. According to a sixteenth aspect of the present invention, there is provided a method for assembling a disk drive device, wherein contact between two surfaces is detected by detecting rotational runout of the spindle hub.

In this way, highly reliable reduction of disk vibration can be realized without providing a special sensor. According to a seventeenth aspect of the present invention, in the disk drive device of the present invention, a plurality of feed screws are provided, and the ring-shaped member is moved by the same feed amount by each of the feed screws to keep the two facing surfaces parallel to each other. It is configured such that a predetermined amount of axial clearance can be formed as it is.

According to this, the disk vibration can be reduced by keeping the surface of the ring-shaped member and the bottom surface of the spindle hub facing the ring-shaped member parallel to each other and obtaining a stable damping force.

In the disk drive device according to the eighteenth aspect of the present invention, it is possible to detect the axial movement of the ring-shaped member by detecting the rotational torque of the feed screw.

According to this, it is possible to realize highly reliable reduction of disk vibration without providing a special sensor. According to a nineteenth aspect of the present invention, in the disk drive device of the present invention, the feed screw has a head, and the ring-shaped member moves in the axial direction due to fluctuations in the rotational torque when the head is locked to another member. It is possible to detect that.

According to this, it is possible to realize highly reliable reduction of disk vibration without providing a special sensor. In the disk drive device of the present invention according to claim 20, the feed screw is a male screw, the ring-shaped member is provided with a female screw to which the male screw is screwed, and the screw head provided on the male screw is a casing. By locking the male screw in the axial direction, it is possible to position the male screw and the ring-shaped member in the axial direction by locking the male screw.

According to this, it is possible to use a feed screw, which is an easily available and inexpensive mechanical element, and the actuation of the feed screw is a simple work of turning the screw. Reduction can be realized.

According to a twenty-first aspect of the present invention, there is provided a method of assembling a disk drive device, wherein a spindle hub on which an information recording disk is mounted is rotatably supported in a housing, and a surface thereof faces a bottom surface of the spindle hub. A ring-shaped member is provided on the housing, and when assembling a disk drive device that constitutes a squeeze air bearing with the bottom surface of the spindle hub and the surface of the ring-shaped member facing it, the bottom surface of the spindle hub and this By interposing a spacer between the surfaces of the ring-shaped members facing each other, the spindle hub and the ring-shaped member are axially positioned with respect to each other, and then the spacers are removed so that the two surfaces facing each other are opposed to each other. A predetermined amount of axial gap is provided between the two.

By doing so, it is not necessary to adjust the gap during assembly, and a stable vibration damping force can be obtained, whereby the disk vibration can be reduced. The disk drive device of the present invention according to claim 22 is
The spindle hub has a disc-shaped extension extending in the outer peripheral direction at its bottom, and this disc-shaped extension forms the bottom surface of the spindle hub, and the outer diameter of the disc-shaped extension that forms the bottom surface of this spindle hub is information. It is formed to be larger than the inner diameter of the data area of the recording disk.

According to this, since the vibration speed increases toward the outer periphery of the spindle hub, a greater squeeze effect can be obtained, and the damping force of the disk drive device can be increased and the disk vibration can be reduced. it can.

According to a twenty-third aspect of the present invention, there is provided a disk drive device in which at least (0,1) and (0,0) of natural vibrations of a spindle portion including an information recording disk and a spindle hub are included.
In the 0) mode, the phase of vibration of the disk-shaped extending portion of the spindle hub and the other portion are the same.

According to this, the vibration direction of the disk-shaped extending portion is made to coincide with the vibration direction of the spindle hub or the disk, so that the disk drive device can be reliably damped and the disk vibration can be reduced.

According to a twenty-fourth aspect of the present invention, there is provided a disk drive device in which a voltage-displacement conversion member is provided between a ring-shaped member and a housing, and a voltage is applied to this voltage-displacement conversion member. The position of the ring-shaped member in the axial direction with respect to the bottom surface of the spindle hub is adjusted.

According to this, depending on the operating state and operating environment of the disk drive device, while avoiding contact, the gap between the surface of the ring-shaped member and the bottom surface of the spindle hub is kept to a minimum and stable damping force is obtained. As a result, it is possible to reduce the disk vibration.

According to a twenty-fifth aspect of the present invention, in the disk drive device of the present invention, the bottom surface of the spindle hub and the surface of the ring-shaped member are in surface contact with each other when no voltage is applied to the voltage-displacement conversion member, and the voltage- When a voltage is applied to the displacement converting member, an axial gap is formed between the bottom surface of the spindle hub and the surface of the ring-shaped member.

According to this, by making surface contact in advance, even when a large impact is applied in that state, damage due to collision of both can be prevented, and highly reliable reduction of disk vibration can be realized.

According to a twenty-sixth aspect of the present invention, in the disk drive device of the present invention, the surface of the ring-shaped member is away from the bottom surface of the spindle hub and the voltage-displacement is generated when the voltage-displacement conversion member is not applied with voltage. When a voltage is applied to the conversion member, the surface of the ring-shaped member approaches the bottom surface of the spindle hub, and an axial gap of a predetermined size is formed between the bottom surface of the spindle hub and the surface of the ring-shaped member. Is formed.

According to this, when a shock is applied when the disk drive is not operating, the shock may be greater than when the disk drive is operating. By increasing the clearance between the surface of the disk and the surface of the disk, damage due to collision between the two can be prevented, and highly reliable disk vibration can be reduced.

According to a twenty-seventh aspect of the present invention, there is provided a disk drive device capable of forming an axial gap between the bottom surface of the spindle hub and the surface of the ring-shaped member by thermal expansion of the ring-shaped member. is there.

According to this, similarly, depending on the operating state and operating environment of the disk drive device, the gap between the surface of the ring-shaped member and the bottom surface of the spindle hub is kept to a minimum while avoiding contact, and a stable damping force is achieved. Therefore, it is possible to reduce the disk vibration.

According to a twenty-eighth aspect of the present invention, there is provided a method for assembling a disk drive device, wherein a voltage is applied to a voltage-displacement conversion member provided between the ring-shaped member and the casing, or the ring-shaped member. Is thermally expanded to adjust the axial position of the ring-shaped member with respect to the bottom surface of the spindle hub.

In this way, it is possible to provide a minimum gap according to each product, and obtain a stable vibration damping force of the disk drive device with a small variation, thereby reducing the disk vibration. realizable.

According to a twenty-ninth aspect of the present invention, there is provided a method for assembling a disk drive device, wherein a voltage is applied to a voltage-displacement conversion member provided between the ring-shaped member and the casing, or the ring-shaped member. Of the ring-shaped member relative to the bottom surface of the spindle hub can be adjusted by utilizing the thermal expansion of the two, and the two opposing surfaces are spaced apart from each other in the axial direction. The ring-shaped member is moved by a first predetermined amount in a direction in which the two surfaces come close to each other, and then contact detection of the two surfaces is performed. If they are not in contact, the ring-shaped member is further moved to the first surface. The ring-shaped member is moved by a predetermined amount, and the first predetermined amount of movement of the ring-shaped member is repeated until the two surfaces come into contact with each other. When the two surfaces come into contact with each other, the two surfaces are moved forward in a direction away from each other. It is intended to move the ring-shaped member by a second predetermined amount.

In this way, it is possible to provide a minimum gap according to each product, and obtain a stable vibration damping force of the disk drive device with a small variation to reduce disk vibration. realizable.

According to a thirtieth aspect of the present invention, there is provided a method of assembling a disk drive device, which detects that two surfaces are in contact with each other, and moves the ring-shaped member by a second predetermined amount in a direction in which these two surfaces move away from each other. After moving the ring-shaped member, the ring-shaped member is moved in a direction in which the two surfaces are further apart from each other.

By doing so, it is possible to provide a minimum gap according to each product, and obtain a stable vibration damping force of the disk drive device with a small variation to reduce disk vibration. Can be realized and 2
By increasing the gap between the two surfaces, collision between these two surfaces can be reliably prevented.

According to a 31st aspect of the present invention, there is provided a method for assembling a disk drive device, wherein a voltage-displacement conversion member is used.
It detects contact between two surfaces. This way, it is highly reliable, without the need for a special sensor.
It is possible to reduce disk vibration.

According to a thirty-second aspect of the present invention, there is provided a disk drive device having means for detecting contact between the bottom surface of the spindle hub and the surface of a ring-shaped member facing the bottom surface of the spindle hub when the spindle hub is rotationally driven. However, the voltage-displacement conversion member is configured so as to be able to move the ring-shaped member away from the spindle hub when it is detected that these two surfaces are in contact with each other. is there.

According to this, by increasing the gap between the surface of the ring-shaped member and the bottom surface of the spindle hub, collision between these two surfaces can be avoided and highly reliable disk vibration reduction can be realized. .

According to a thirty-third aspect of the present invention, in the disk drive device of the present invention, the voltage-displacement conversion member also serves as contact detection means. According to this, highly reliable reduction of the disk vibration can be realized without providing a special sensor.

In the disk drive apparatus according to a thirty-fourth aspect of the present invention, acceleration detecting means is provided to increase the distance from the bottom surface of the spindle hub to the surface of the ring-shaped member when an impact of a predetermined value or more is applied. It is configured to be able to.

According to this, the disk drive device of the present invention according to claim 35, which can prevent the ring-shaped member from being damaged by the collision with the spindle hub and can realize highly reliable disk vibration reduction. A ring-shaped member, which rotatably supports a spindle hub on which an information recording disk is mounted, is rotatably supported on the housing, and a surface of which faces the bottom surface of the spindle hub is provided on the housing. A means for generating a dynamic pressure is provided between the surface of the ring-shaped member and the surface of the ring-shaped member facing each other.

According to this, the rigidity of the spindle system can be increased by the generated dynamic pressure and the disk vibration can be reduced. In the disk drive device according to a thirty-sixth aspect of the present invention, the dynamic pressure generating means is a convex portion or a concave portion formed on at least one of the bottom surface of the spindle hub and the surface of the ring-shaped member facing the bottom surface. It was done like this.

According to this, the rigidity of the spindle system is increased by the dynamic pressure generated by the pumping action,
It is possible to reduce disk vibration. The disk drive device of the present invention according to claim 37, wherein a spindle hub on which an information recording disk is mounted is rotatably supported by a housing, and an outer circumference or an inner circumference facing the inner circumference or the outer circumference side surface of the spindle hub. A ring-shaped member having a side surface of the spindle hub is provided on the housing, and an air bearing is formed by the inner or outer side surface of the spindle hub and the outer or inner side surface of the ring-shaped member facing the side surface. is there.

According to this, as compared with the case where the air bearing plate is opposed to the disk, the disk tilt due to the tilt of the disk receiving surface of the spindle hub, the disk warp due to clamping, and the deformation of the disk due to the vibration impact can be prevented. Since there is no surface run-out of the original disk, the gap between the ring-shaped member and the spindle hub can be greatly reduced, and there are no magnetic heads or other obstacles along the side of the spindle hub, which makes it possible to make a full circle. Ring-shaped members can be provided in all regions. As a result, it is possible to increase the damping force of the disk drive device based on the fluid force, and thereby reduce the disk vibration. Since it is possible to bring the spindle hub and the ring-shaped member into contact with each other during assembly, there is flexibility in the assembly method.

In the disk drive apparatus of the present invention as set forth in claim 38, the air bearing is either a squeeze air bearing or a dynamic pressure bearing. According to this, compared with the case where the air bearing plate is opposed to the information recording disk, it is based on the disk inclination due to the inclination of the disk receiving surface of the spindle hub, the disk warp due to clamping, and the deformation of the disk due to the vibration impact. Since it is not affected by surface runout of the disk, the axial gap between the surface of the ring-shaped member and the bottom surface of the spindle hub can be greatly reduced.

According to a thirty-ninth aspect of the present invention, there is provided a disk drive device in which a first side surface is provided on an inner circumference or an outer circumference of a spindle hub.
And a second chamfer on the outer or inner side surface of the ring-shaped member facing the inner or outer side surface of the spindle hub, and the first chamfer and the second chamfer are formed. In the chamfered portion, the third chamfered portion formed on the inner peripheral ring of the aligning member in which the inner peripheral ring and the outer peripheral ring are concentrically arranged contacts one of the first and second chamfered portions. It is possible and the fourth chamfered portion formed on the outer peripheral ring of the aligning member is capable of contacting the other of the first and second chamfered portions, so that the spindle hub and the ring shape are formed. The member and the member are configured so that they can be aligned with each other.

According to this, by the stable dynamic pressure generated from the air bearing surfaces provided concentrically, the rigidity of the spindle system can be increased and the disk vibration can be reduced. The present invention according to claim 40 relates to a magnetic disk device comprising the disk drive device of the present invention,
By increasing the damping force of the disk drive device, it is possible to reduce the vibration of the disk drive device and eventually the disk,
It is possible to provide a magnetic disk device capable of achieving high recording density.

Hereinafter, the embodiment of the present invention will be described with reference to FIG.
From FIG. 18 onward will be described. (Embodiment 1) FIG. 1 is a sectional view of a main part of a magnetic disk device using a disk drive device according to Embodiment 1 of the present invention. The disk drive device shown in FIG.
The cylindrical portion 43a of 3 holds the bearing 8, and the shaft 9 and the spindle hub 2 are rotatably held via the bearing 8. A predetermined amount of load is applied to the inner ring 8a of the bearing 8 in the axial direction in advance when the rotary drive device 5 is assembled, so that the bearing 8 has rigidity and the rotary drive device 5 is raised without rattling. Achieves precision rotation.
Up to this point, the operation is the same as that of a general disk drive device.

The disk drive device according to the first embodiment of the present invention is characterized in that the spindle hub bottom surface 2
The ring-shaped member 12 facing d is provided in the housing 43, and the squeeze air bearing surfaces 2e and 12b are formed by using the spindle hub bottom surface 2d and the surfaces of the ring-shaped member 12, that is, two surfaces facing each other as smooth surfaces. It is in. In FIG. 1, the ring-shaped member 12 is fixed to the housing 43 with an adhesive 14. The ring-shaped member 12 and the housing 43 may be integrally configured.

The operation of the air bearing surfaces 2e and 12b will be described below. When the rotary drive device 5 rotates, an air excitation force, which is a main factor of disturbance to the rotary drive device 5, acts. As described above, the bearing 8 has rigidity because it is preloaded, but the natural vibration is excited by the disturbance such as the air exciting force. In the natural vibration modes that have the greatest influence of preventing the magnetic head from following the data track on the disk 1, that is, in the (0,0) and (0,1) modes, the spindle hub bottom surface 2d has a large axial vibration component.

FIG. 2 shows the displacement of each part in the (0,0) and (0,1) modes when the disk 1 is placed on the rotary drive device 5. FIG. 2A shows the displacement in the (0,0) mode. In this case, the bearing 8 serves as a spring so that the rotating portions of the disk 1 and the spindle hub 2 are axially aligned in the same phase over the entire circumference. It is displaced. Figure 2
(B) shows the displacement in the (0,1) mode,
The bearing 8 serves as a spring, and the rotating parts such as the disk 1 and the spindle hub 2 are displaced in the inertial direction around the axis perpendicular to the paper surface.

In FIG. 1, the bottom surface 2d of the spindle hub vibrates in the axial direction, and the air bearing surface 2e and the air bearing surface 12 are
When the volume of the space sandwiched between b and b changes, the squeeze action provides a damping effect. This will be explained below. The bottom surface 2d of the spindle hub vibrates in the axial direction,
When the volume of the space sandwiched between the air bearing surface 2e and the air bearing surface 12b changes, the atmospheric pressure of that part changes. This causes air to flow in or out from the surroundings, but the movement of the air is hindered by the action of viscous resistance and inertia. When the vibration frequency is relatively low, the movement of air follows the vibration and the change in atmospheric pressure is eliminated, but when the vibration frequency is high, the movement of air cannot follow the vibration, The atmospheric pressure remains changed. Since the pressure difference due to the change in the atmospheric pressure acts in the direction to restore the displacement due to the vibration, the damping effect can be obtained. This squeeze action has a great effect in a magnetic disk device in a frequency range in which there is a natural vibration mode that has the greatest effect of preventing the magnetic head from following the data track on the disk.

Next, the effect of the air bearing surfaces 2e and 12b will be described. Compared with the case where the air bearing surface is provided near the outer periphery of the disk 1, the air bearing surface 2e and the air bearing surface 12b are provided at the positions corresponding to the bottom surface 2d of the spindle hub.
Of the disk 1 due to the inclination of the disk receiving surface 2c of
Since there is almost no influence such as warping of the disk 1 due to clamping and surface wobbling of the disk 1 due to deformation of the disk 1 due to vibration and impact, the air bearing surface 12b of the ring-shaped member 12 and the air bearing surface 2e of the spindle hub bottom surface 2d. The gap between and can be greatly reduced. Further, at this position, since there are no actuators for moving the magnetic head, an enclosure wall, an obstacle such as a filter, the ring-shaped member can be provided in the entire area of one circumference. As a result, it is possible to increase the damping force for the rotary drive unit 5, reduce the vibration of the rotary drive unit 5 and eventually the disc, and provide a magnetic disk drive capable of achieving high recording density. Further, when the surface of the disk 1 is used as the air bearing surface instead of the configuration of the present invention, the squeeze air bearing plate cannot be brought into contact with the surface of the disk 1 because the data surface may be damaged. When the air bearing surface 2e is provided on the bottom surface 2d of the spindle hub as in the invention, the air bearing surface 2 is assembled during assembly.
Since there is no problem even if the e and 12b contact each other, there is a degree of freedom in the assembling method.

FIG. 3 is a cross-sectional view of another disk drive device according to the first embodiment of the present invention and a main part of a disk device using the same. Since the disk drive device shown in FIG. 3 has a structure similar to that of the disk drive device shown in FIG.
Only the difference in structure will be described below. In FIG. 3 (a),
The viscoelastic member 13 is provided between the ring-shaped member 12 and the housing 43 to which the ring-shaped member 12 is fixed. In FIG. 3B, the ring-shaped member 12 itself includes the viscoelastic member 13.

In this structure as well, the squeeze action works as in the magnetic disk device shown in FIG. 1, but other actions will be described below. Ring-shaped member 12 and housing 4
A force that responds to the vibration of the rotary drive unit 5 acts on the unit 3. By providing the viscoelastic member 13, the force transmitted to the ring-shaped member 12 based on the vibration of the rotary drive device 5 can be converted into thermal energy by the viscoelastic member 13. This makes it possible to suppress the vibration of the housing 43. This point is effective as a measure for the case where the strength of the housing 43 is insufficient due to the limitation of the dimension in the axial direction, and thus has an effect of providing a magnetic disk device capable of realizing high recording density.

(Embodiment 2) FIG. 4A is a sectional view showing a state in the middle of assembly of a disk drive apparatus according to Embodiment 2 of the present invention. In the disk drive device shown in FIG. 4, description of the same parts as those of a general disk drive device will be omitted. The feature of the second embodiment of the present invention is that the ring-shaped member 12 facing the bottom surface 2d of the spindle hub is provided in the housing 43, and the two surfaces of the two facing each other are smooth surfaces.
In the disk drive device of b, the spindle hub 2
There is a structure and an assembling method for making the gap between the air bearing surface 2e provided in the air bearing surface 2e and the air bearing surface 12b provided in the ring-shaped member 12 facing the air bearing surface 2e a predetermined amount.

As a specific structure, the ring-shaped member 12 is provided with a plurality of holding portions 12c fixed to the ring-shaped member 12, for example, protrusions. The housing 43 is provided with a hole 43b into which the holding portion 12c can freely move in the axial direction without resistance. Ring-shaped member 12
In a state in which is attached to the housing 43, the holding portion 12c projects toward the back surface 43c of the housing 43, and the projecting portion can be held by using the jig 15 or the like. When it is difficult to provide a sufficient size of the holding portion 12c due to the axial size limitation of the disk drive device, as shown in the drawing, the counterbore 43d is provided in the housing 43.
May be provided.

A method of assembling the disk drive device having such a structure into the vibration damping structure will be described below. First,
The holding portion 12c of the ring-shaped member 12 is inserted into the hole 43b provided in the housing 43. Then, the ring-shaped member 12 is attached to the housing 4
The rotary drive device 5 is assembled so as to be axially movable between the spindle 3 and the spindle hub 2. Here, the axial gap between the air bearing surface 2e of the spindle hub 2 and the ring-shaped member mounting surface 43e of the housing 43 is formed to be larger than the axial thickness of the ring-shaped member 43, and the air bearing surface of the spindle hub 2 is formed. 2e and ring-shaped member mounting surface 43e of the housing 43
The ring-shaped member 12 is configured to be movable in the axial direction within the gap between the and. Next, the holding portion 12c is held by the jig 15 or the like, and the air bearing surface 12b of the ring-shaped member 12 is brought into surface contact with the air bearing surface 2e of the spindle hub 2 to make the gap between them zero. The state at this time is shown in FIG.
It is shown in (a). Next, the air bearing surface 12b of the ring-shaped member 12 is replaced with the air bearing surface 2e of the spindle hub 2.
The jig 15 is moved in the axial direction by a predetermined amount so as to move away from it. Thereby, a required gap can be secured between the air bearing surface 12b of the ring-shaped member 12 and the air bearing surface 2e of the spindle hub 2. In this state, for example, the adhesive 1 is placed in the gap between the ring-shaped agent 12 and the ring-shaped member mounting surface 43e of the housing 43 and the gap between the holding portion 12c and the hole 43b.
4, the ring-shaped member 12 is fixed to the housing 43 and the gap is sealed. The state at this time is shown in FIG.
It shows in (b). If the work is performed with the back surface 43c of the housing 43 facing upward, the inflow of the adhesive 14 can be facilitated by the influence of gravity.

The size of the gap between the air bearing surface 2e of the spindle hub 2 and the air bearing surface 12b of the ring-shaped member 12 depends on the accuracy of the feed mechanism of the jig 15, the disturbance such as vibration and shock, and the thermal expansion of each member. Considering the trade-off between the fact that the gap does not become zero even if there is a change in this gap, that is, they do not contact each other, and the increase in power consumption by reducing the gap,
A large damping effect can be obtained. Regarding the accuracy of the feeding mechanism of the jig 15, it is possible to move the jig 15 with an accuracy of, for example, about 10 μm without requiring expensive equipment. From this, it is considered that even if the gap is set large in advance with a margin for reduction of the gap due to disturbance such as thermal expansion and vibration impact, it is industrially possible to make the gap several tens of μm.

The operation of the air bearing surfaces 2e, 12b constructed by such a structure and assembling method is the same as the squeeze operation described in the first embodiment, and therefore the description thereof is omitted here.

Next, the effect of the air bearing surfaces 2e and 12b will be described below. The effects of the air bearing surfaces 2e, 12b configured by such a structure and the assembling method are qualitatively similar to the squeeze effect described in the first embodiment, and therefore the details are omitted and only different points are shown. That is, the air bearing surface 12 of the ring-shaped member 12
b and the air bearing surface 2e of the spindle hub 2,
As described above, it can be reduced to, for example, about several tens of μm, whereby the vibration damping force for the rotary drive device 5 is greatly increased, vibration of the rotary drive device 5 and thus the disk 1 is reduced, and high recording density is achieved. It is possible to provide a magnetic disk device that can be realized.

FIG. 5 is a sectional view of another disk drive device according to the second embodiment of the present invention. The structure of the disk drive device shown in FIG. 5 is similar to that of the disk drive device shown in FIG. 4, and only different points will be described below. here,
Ring-shaped member 12 and ring-shaped member mounting surface 4 of housing 43
A compressible member 16 is provided between the compressive member 16 and 3e. As a material for forming the compressible member 16, a wave washer or a foamed rubber having closed cells is suitable.

A method of assembling the disk drive device having such a structure so as to have a vibration damping function will be described below. First, the ring-shaped member 12 and the compressible member 16 are interposed between the housing 43 and the spindle hub 2 to assemble the rotary drive device 5. At this time, the holding portion 12c of the ring-shaped member 12 is inserted into the hole 43b provided in the housing 43 in advance. At this time, by setting the size of the compressible member 16 so as to be axially compressed by the housing 43 and the ring-shaped member 12, the repulsive force of the compressible member 16 causes the air of the spindle hub 2 to move. The air bearing surface 12b of the ring-shaped member 12 can be held in surface contact with the bearing surface 2e.

With such a structure, the air bearing surface 2
When the e and 12b are brought into surface contact with each other, it is possible to save the labor of holding the holding portion 12c with the jig 15 as shown in FIG. 4 (a). A subsequent procedure for creating a predetermined amount of clearance between the air bearing surface 12b of the ring-shaped member 12 and the air bearing surface 2e of the spindle hub 2 and fixing the clearance to the housing 43 in this state is shown in FIG. It is similar to

The operation of the air bearing surfaces 2e, 12b having such a structure and assembling means is the same as the squeeze operation described in the first embodiment, and therefore detailed description thereof is omitted here.

Next, the effect of the air bearing surfaces 2e and 12b will be described. The effect of the air bearing surfaces 2e and 12b having such a structure and assembling means is as shown in FIG.
This is basically the same as the squeeze effect described in the disk drive device of FIG. Therefore, only different points will be described. That is, as described above, the air bearing surface 1 of the ring-shaped member 12 is held by holding the holding portion 12c with the jig 15 or the like, which was necessary when assembling the disk drive device of FIG.
It is possible to omit the procedure of bringing the air bearing surface 2e of the spindle hub 2 into contact with the air bearing surface 2e to make the gap between them zero. This simplifies the assembly procedure and also shortens the assembly time. Therefore, it is possible to provide a magnetic disk device that can easily realize high recording density.

The compressible member 16 may also serve as a sealing packing such as a gasket. Ring-shaped member 1
FIG. 6 shows another means for holding 2 and moving it axially.
Shown in. As shown in FIG. 6A, as a means for holding the ring-shaped member 12 and moving it in the axial direction, a part of the ring-shaped member 12 is made of a magnetic material or a magnet, and the ring-shaped member 12 is held by the member. If the jig 15 is made of a magnet or a magnetic material, the ring-shaped member 12 can be easily held.
Further, as shown in FIG. 6B, the ring-shaped member 12 is provided with a recess 12d, and the tip of the jig 15 is inserted into the recess 12d so that the ring-shaped member 12 is held by the jig 15. Good.

(Embodiment 3) FIG. 7A is a sectional view showing a state during assembly of a disk drive apparatus according to Embodiment 3 of the present invention, and FIG. 7B shows a completed assembly state. FIG. In the disk drive device shown in FIG. 7, detailed description of the same parts as those of a general disk drive device will be omitted. Here, the compressible member 16 is provided between the ring-shaped member 12 and the housing 43. As a result, as in the case of the second embodiment, when the rotary drive device 5 is assembled in the housing 43, the air bearing surface 12e of the ring-shaped member 12 makes surface contact with the air bearing surface 2e of the spindle hub 2. . The ring-shaped member 12 is provided with a female screw 12f that opens facing the hole 43b provided in the housing 43, and a gap adjusting screw 17 that passes through the hole 43b is screwed into the female screw 12f. The diameter of the screw head 17a of the clearance adjusting screw 17 is formed to be larger than the diameter of the hole 43b, so that the screw head 17a engages with the housing 43. When it is difficult to provide a sufficient axial dimension of the screw head 17a due to the axial dimension limitation of the disk drive device, the housing 43 is provided with a counterbore 43.
You may provide d.

A procedure for assembling the disk drive device having such a structure into a vibration damping structure in which a predetermined gap is provided between the air bearing surfaces 2e and 12b will be described below.
First, the plane positions of the female thread 12f of the ring-shaped member 12 and the hole 43b of the housing 43 are aligned, the clearance adjusting screw 17 is passed through the housing 43 and the compressible member 16, and then screwed to the female thread 12f. Lightly tighten on the strip member 12.
That is, when the compressive member 16 begins to compress due to the action of the clearance adjusting screw 17, the screw drive torque increases.
It is sufficient to stop tightening at that point.

Next, the rotary drive unit 5 is assembled to the housing 43. At this time, as shown in FIG. 7A, the air bearing surface 2e of the spindle hub 2 presses the air bearing surface 12b of the ring-shaped member 12 axially to make surface contact, and the gap between the two becomes zero. Further, the compressible member 16 is compressed in the axial direction,
As a result, there is a gap between the screw head bearing surface 17b of the gap adjusting screw 17 and the housing 43.

Next, the air bearing surface 2 of the spindle hub 2
The gap adjusting screw 17 is turned in a direction in which an axial gap is created between e and the air bearing surface 12b of the ring-shaped member 12.
When the screw head bearing surface 17b comes into contact with the housing 43, the torque for turning the screw, that is, the screw drive torque is increased by the frictional force due to the contact. At this time, the spindle hub 2
It can be considered that a slight gap is generated or has begun to occur between the air bearing surface 2e of the above and the air bearing surface 12b of the ring-shaped member 12. Therefore, in order to provide a predetermined amount of gap between them, the gap adjusting screw 17 is further rotated by a predetermined amount from this state, and the ring-shaped member 12
Away from the spindle hub bottom surface 2d in the axial direction. The state is shown in FIG.

The rotation amount of the gap adjusting screw 17 for creating a predetermined amount of axial gap between the air bearing surfaces 2e, 12b will be described. Set the pitch of the clearance adjustment screw 17 to P
Then, the rotation angle θ1 of the gap adjusting screw 17 for moving the ring-shaped member 12 by the distance L1 is L1 / P × 36.
It is 0 °. For example, P = 0.2 mm, L1 = 0.0
If it is 3 mm, θ1 = 54 °. Further, for example, when the error of the rotation angle of 5 ° occurs, the influence on the distance L1 is about 0.003 mm, and when the gap of about 0.03 mm is set, the error of the rotation angle of 5 ° is the air bearing surface 2e. , 12b, it can be considered that the influence is not so large as to bring them into contact with each other.

Therefore, in this state, if the clearance adjusting screw 17 is fixed to the housing 43 with the adhesive 14 or the like, the ring-shaped member 12 is fixed to the housing 43, and the air bearing surface 2e of the spindle hub 2 is fixed. A gap with the air bearing surface 12b of the ring-shaped member 12 can be maintained. Alternatively, as another means, the gap adjusting screw 17 can be fixed to the housing 43 by utilizing the elastic compressive force of the compressible member 16. In this case, the air bearing surface 2e of the spindle hub 2
The static frictional force due to the elastic compression force of the compressible member 16 in a state where a predetermined gap is provided between the ring-shaped member 12 and the air bearing surface 12b of the ring-shaped member 12 causes the ring-shaped member 12 and the gap adjusting screw 1
It may be designed so as to be larger than the inertial force due to the disturbance applied to 7.

From the viewpoint of stabilizing the posture of the ring-shaped member 12, it is preferable that the number of the female screws 12f be three at equal intervals along the circumferential direction of the ring-shaped member 12. That is, in this case, a plurality of female screws 12f and gap adjusting screws 17 corresponding thereto are provided along the circumferential direction of the housing 43,
The ring-shaped member 12 is moved by the same feed amount by the respective gap adjusting screws 17, and the two facing surfaces 2e, 1
It is possible to form a predetermined amount of axial gap while maintaining the parallelism of 2b. As a result, the air bearing surface 12b of the ring-shaped member 12 and the air bearing surface 2e of the spindle hub 2 facing the ring-shaped member 12 are kept parallel to each other, and stable vibration damping force is obtained, so that the disk vibration can be reduced.

There are the following methods for further reducing the axial gap between the air bearing surface 2e of the spindle hub 2 and the air bearing surface 12b of the ring-shaped member 12. That is, the predetermined amount of the gap between the two is set small in advance, and the presence or absence of contact between the air bearing surface 2e of the spindle hub 2 and the air bearing surface 12b of the ring-shaped member 12 is detected. The air bearing surfaces 2e and 12b are parallel smooth surfaces in terms of design, but in the actual machined surface, it is impossible to make the waviness completely zero and the parallelism completely zero.
Therefore, when the relative rotational positional relationship between the air bearing surfaces 2e and 12b changes, that is, the rotary drive device 5
It is conceivable that when the is rotated, the axial gap changes, and the contact occurs accordingly. If the spindle hub 2 and the ring-shaped member 12 contact each other, the ring-shaped member 12 is further moved in the axial direction from the air bearing surface 2e of the spindle hub 2, and contact detection is performed again. This is repeated until the two do not contact each other.

In this method, since it is not possible to finally know how much the minimum gap between the two is present, it is conceivable that the two come into contact with each other due to thermal deformation or vibration impact. Therefore,
After the two are no longer in contact with each other, the ring-shaped member 12 may be further moved in the axial direction by a separately set predetermined amount to widen the gap. It is preferable that the further movement amount is set in consideration of the reduction amount of the axial gap between the air bearing surfaces 2e and 12b due to thermal deformation or vibration impact.

As the contact detecting means for both of them, the rotational torque of the disk drive device when the power is not applied or the rotational runout of the disk drive device can be used. FIG. 8 shows the rotation torque when the power is not supplied. The horizontal axis represents the rotation angle and the vertical axis represents the rotation torque. The rotational torque described here is a torque applied to the disk drive device when the disk drive device is slowly rotated by an external force. FIG. 8A shows the rotation torque when there is no contact between them. When there is no contact, the attracting force of each of the rotor magnets of the disk drive device and the stator pole teeth changes in accordance with the change in the relative position, resulting in a wavy curve as illustrated. Figure 8
(B) shows the rotational torque when there is a contact between the two. When they come into contact with each other, a frictional force due to the contact acts to prevent rotation of the disk drive device, so that a hill like a hill in the figure and a peak like a beard appear. In this way, contact detection can be performed based on the rotational torque waveform.

FIG. 9 shows the rotational runout of the disk drive device. The horizontal axis represents the rotation angle or frequency, and the vertical axis represents the amplitude. The rotational runout described here is a relative displacement of the spindle hub 2 in the axial direction or the radial direction when the disk drive device is rotated at a predetermined rotation speed. Figure 9
(A) shows the rotational shake when there is no contact between the two, with the horizontal axis as the rotation angle. It can measure almost wavy and smooth waveforms. FIG. 9B shows the rotational shake when the two are in contact with each other, with the horizontal axis representing the rotational angle. You can measure peaks like a sharp mustache. FIG. 9C shows the rotational shake when there is no contact between the two, with the horizontal axis representing frequency. There is no peak in the high frequency region above 10 kHz. FIG. 9D shows the rotational shake when the two are in contact, with the horizontal axis representing frequency. A sharp whisker-like peak can be measured even in a high frequency region exceeding 10 kHz. The contact can be detected by such a difference that appears in the rotating torque and the rotating touch waveform when the contact is made and when the contact is not made.

The operation of the air bearing surfaces 2e and 12b constructed by such a structure and assembling method is the same as the squeeze operation described in the first embodiment, and therefore the detailed description thereof will be omitted here.

Next, the effect of the air bearing surfaces 2e and 12b will be described. The effects of the air bearing surfaces 2e and 12b configured by such a structure and assembling method are qualitatively similar to the squeeze effect described in the first embodiment, and therefore detailed description thereof will be omitted and different. Only points are shown. The gap between the air bearing surface 12b of the ring-shaped member 12 and the air bearing surface 2e of the spindle hub 2 can be formed by a simple operation of simply rotating the screw 17 without using a device for positioning the ring-shaped member 12. As described above, for example, it can be about several tens of μm.
As a result, the vibration damping force for the rotary drive device 5 is greatly increased, and the vibration of the rotary drive device 5 and thus the disk can be reduced. As a result, it is possible to provide a magnetic disk device capable of achieving high recording density.

(Embodiment 4) FIG. 10 is a sectional view of a disk drive device according to Embodiment 4 of the present invention. In the disk drive device shown in FIG. 10, detailed description of the same parts as those of a general disk drive device will be omitted. The concrete structure here is the bottom surface 2 of the spindle hub.
A slit 43g having an axial width that covers the axial width when a predetermined gap provided between the air bearing surface 2e of d and the air bearing surface 12b of the ring-shaped member 12 is projected in the radial direction. It is provided on the side surface of the cylindrical portion 43f of the housing 43.

Next, the assembling procedure will be described. First,
The ring-shaped member 12 is attached to the housing 43 and the bottom surface 2d of the spindle hub.
A rotary drive device 5 is assembled by arranging the rotary drive device 5 in the axially movable state. Here, the air bearing surface 2 of the spindle hub 2
e in the gap between the ring-shaped member mounting surface 43e of the housing 43 and the air-bearing surface 2e of the spindle hub 2 and the housing 4 so that the ring-shaped member 12 can move in the axial direction.
The gap between the ring-shaped member mounting surface 43e and the ring-shaped member mounting surface 43e is a predetermined axial gap between the axial thickness of the ring-shaped member 12 and the air bearing surfaces 2e and 12b to be provided after the ring-shaped member 12 is fixed. It is set to be larger than the amount of Sato. Next, a spacer 1 having a required axial thickness
8 is inserted into the housing 43 through the slit 43g, and is inserted between the air bearing surface 2e of the spindle hub bottom surface 2d and the air bearing surface 12b of the ring-shaped member 12. next,
The ring-shaped member 12 is moved in a direction in which the axial gap between the air bearing surface 12b and the air bearing surface 2e decreases, and one surface of the spacer 18 makes surface contact with the air bearing surface 2e, and the other surface of the spacer 18 becomes The spacer 18 is in surface contact with the air bearing surface 12b, and the gap between the air bearing surfaces 2e and 12b is formed by the spacer 18
It should be the same as the axial thickness of. Ring-shaped member 1
The movement of 2 in the axial direction may be performed by inserting the jig 15 or the like through the hole 43b provided in the housing 43 and pushing it.
Then, in this state, the ring-shaped member 12 is fixed and sealed to the housing 43 with an adhesive or the like. Then, the spacer 18 is removed. Since the force for pressing the ring-shaped member 12 is light enough to move the ring-shaped member 12, the spacer 18 can be easily pulled out.

If the work is performed with the back surface 43c of the housing 43 facing upward, the ring-shaped member 12 can be naturally moved in the axial direction toward the spindle hub 2 by the action of gravity. In addition, the inflow of the adhesive can be facilitated. Further, the ring-shaped member 12 is moved in the axial direction by its own weight, and the air bearing surface 12b can be kept in a state in which a predetermined amount of axial gap is maintained with respect to the air bearing surface 2e via the spacer 18.

The operation of the air bearing surfaces 2e, 12b having such a structure and assembling procedure is the same as the squeeze operation described in the first embodiment, and therefore the detailed description thereof is omitted here.

Next, the effect of the air bearing surfaces 2e and 12b will be described below. The effect of the air bearing surfaces 2e, 12b configured by such a structure and the assembling procedure is qualitatively similar to the squeeze effect described in the first embodiment, and therefore the detailed description thereof will be omitted.
Only the differences are shown. The air bearing surface 12b of the ring-shaped member 12 is formed by using the spacer 18 having a predetermined thickness.
And the air bearing surface 2e of the spindle hub 2 are formed, there is no need to adjust the gap during assembly,
It is possible to provide a stable gap that depends on the thickness of the spacer 18 in the axial direction and has little variation among products.
As a result, the vibration damping force for the rotation drive device 5 is greatly increased, the vibration of the rotation drive device 5 and eventually the disk is reduced, and a magnetic disk drive capable of achieving high recording density can be provided.

(Fifth Embodiment) FIG. 11 is a sectional view of a disk drive apparatus according to the fifth embodiment of the present invention. Figure 11
In the disk drive device shown in FIG. 2, detailed description of the same parts as those of a general disk drive device will be omitted.
The fifth embodiment of the present invention is characterized in that the spindle hub bottom surface 2d, that is, the flange portion 2a of the spindle hub 2 is provided with a disk-shaped extending portion 2f extending outward along the radial direction. An air bearing surface 2e is formed by the bottom surface of the flange portion 2a and the bottom surface of the disc-shaped extending portion 2f, while the housing 43 is provided with a ring-shaped member 12 having an air bearing surface 12b facing the air bearing surface 2e. The squeeze air bearing surface is formed by using the two air bearing surfaces 2e and 12b facing each other as smooth surfaces. The outer diameter of the disc-shaped extending portion 2f is formed larger than the inner diameter of the data area of the information recording disc.

FIG. 12 is a sectional view showing a vibration mode in a disk device using the disk drive device according to the fifth embodiment of the present invention. The arrow in the figure indicates the direction of vibration of each member at a certain moment. Since the damping force due to the squeeze action acts on the air bearing surfaces 2e and 12b, if the disc-shaped extension 2f provided with the air bearing face 2e vibrates in the same phase as the spindle hub 2 and the disc 1, the damping force due to the squeeze action will occur. The force is the rotary drive 5 and the disc 1.
Acts to reduce the vibration of.

In particular, as shown in the drawing, a plurality of discs 1,
A magnetic head follows a data track on the disk 1 in a state where a spacer 7 sandwiched between adjacent disks 1 and 1 is integrally fixed to a rotary drive device 5 with a clamp 3 and a screw 4. The natural vibration modes that have a large influence to prevent this are the (0, 1) and (0, 0) modes. Therefore, in these (0,1) and (0,0) modes, the shape of the disc-shaped extension 2f may be determined so that the vibration direction, that is, the phase of the vibration of the disc-shaped extension 2f and the spindle hub 2 match. .

FIG. 12A shows a state in which the phase of the disk-shaped extending portion 2f and the spindle hub 2 are in phase with each other in the (0,1) mode. (0, 1) in FIG. 12 (a)
In the mode, the disc-shaped extension 2f and other portions of the spindle hub 2 and the disc 1 vibrate in the same phase. In this case, the damping force acting on the air bearing surface 2e has the effect of reducing the vibration of the spindle hub 2 and the disk 1.

In FIG. 12B, the phase of the disk-shaped extension 2f and the spindle hub 2 is 180 ° in the (0,1) mode.
It shows how they are displaced. In the (0, 1) mode of FIG. 12B, the disc-shaped extension 2f and the disc 1 vibrate in a phase shifted by 180 °.
In this case, the vibration damping force acting on the air bearing surface 2e has a reduced effect of reducing the vibration of the spindle hub 2 and the disk 1.

The air bearing surfaces 2e, 12 having such a structure.
Since the action of b is the same as the squeeze action described in the first embodiment, the detailed description thereof is omitted here.

Next, the effect of the air bearing surfaces 2e and 12b will be described below. Air bearing surface 2 having such a structure
Since the effects of e and 12b are qualitatively similar to the squeeze effect described in the first embodiment, detailed description thereof will be omitted and only different points will be shown. As described in the first embodiment, the squeeze effect acts to restore the displacement caused by the vibration in response to the vibration, and thus the larger the vibration amplitude, the greater the vibration damping effect. In the (0,0) mode and the (0,1) mode, which are typical natural vibration modes that have the effect of preventing the magnetic head from following the data track on the disk 1, the spindle hub becomes closer to the outer peripheral side. The amplitude of the axial vibration of 2 becomes large. Therefore, if the gaps between the air bearing surfaces 2e and 12b are the same, the obtained damping force becomes large. As a result, the damping force on the rotary drive unit 5 is greatly increased, and the rotary drive unit 5
As a result, it is possible to provide a magnetic disk device capable of realizing high recording density by reducing vibration of the disk 1.

(Sixth Embodiment) FIG. 13 is a sectional view of a disk drive device according to a sixth embodiment of the present invention. Figure 1
In the disk drive device shown in FIG. 3, detailed description of the same parts as those of a general disk drive device will be omitted. Here, as a specific structure, the piezoelectric member 19 is provided between the ring-shaped member 12 and the housing 43, and the ring-shaped member 1
Reference numeral 2 is attached to the piezoelectric member 19, and the piezoelectric member 19 is fixed to the housing 43 by using the adhesive 14 or the like. The piezoelectric member 19 is electrically connected to the voltage supply source, but no voltage is applied when the rotary drive device 5 or the disk device using the rotary drive device 5 is in a non-operating state. When the rotary drive device 5 is not operating, the air bearing surface 12b of the ring-shaped member 12 and the air bearing surface 2e of the spindle hub 2 are in surface contact with each other, and the axial gap between the two is zero. The state at this time is shown in FIG.

Incidentally, the air bearing surface 1 of the ring-shaped member 12
2b and the air bearing surface 2e of the spindle hub 2 are assembled in a state where they are in surface contact with each other as follows. That is,
After assembling the spindle hub 2 into the housing 43, the housing 4
The piezoelectric member 1 by inserting a jig or the like through the hole 43b provided in
9 and the ring-shaped member 12 are pressed against the spindle hub 2 in the axial direction, the piezoelectric member 19 is bonded with the adhesive 14.
The housing 43 may be bonded and sealed. Alternatively, if the piezoelectric member 19 and the housing 43 are bonded and sealed with the adhesive 14 in such a posture that the air bearing surfaces 2e and 12b are in surface contact with each other due to the own weight of the piezoelectric member 19 and the ring-shaped member 12. Good.

When the rotary drive device 5 is activated, a voltage is supplied to the piezoelectric member 19, the axial thickness of the piezoelectric member 19 contracts by a predetermined length, and the air bearing surface 12b of the ring-shaped member 12 is axially moved. Move a predetermined amount to the air bearing surface 2
An axial gap is created between e and 12b. The state at this time is shown in FIG.

The operation of the air bearing surfaces 2e, 12b constructed by such a structure and assembling method is the same as the squeeze operation described in the first embodiment, and therefore the detailed description thereof is omitted here.

Next, the effect of the air bearing surfaces 2e and 12b will be described. Since the effect of the air bearing surfaces 2e and 12b configured by such a structure and the assembling method is qualitatively similar to the squeeze effect described in the first embodiment, detailed description thereof will be omitted and different points. Only shown. Here, the air bearing surface 1 of the ring-shaped member 12
The gap between 2b and the air bearing surface 2e of the spindle hub 2 can be reduced to, for example, 10 μm or less.
As a result, the vibration damping force to the rotary drive device 5 is greatly increased, the vibration of the rotary drive device 5 and eventually the disk is reduced, and a magnetic disk device capable of achieving high recording density can be provided. Further, when not operating, the air bearing surface 12b of the ring-shaped member 12 and the air bearing surface 2e of the spindle hub 2 are
By making the surfaces contact with each other, it is possible to prevent the occurrence of damage due to the collision between the two due to a disturbance such as an impact, and it is possible to provide a highly reliable magnetic disk device.

FIG. 14 is a sectional view of another disk drive device according to the sixth embodiment of the present invention. The structure of the disk drive device shown in FIG. 14 is similar to the structure of the disk drive device shown in FIG. 13, and differences will be mainly described here. As a specific structure, the piezoelectric member 19 is provided between the ring-shaped member 12 and the housing 43, and the ring-shaped member 12
Is fixed to the housing 43 with the adhesive 14 or the like via the piezoelectric member 19. Although the piezoelectric member 19 is electrically connected to the voltage supply source, no voltage is applied when the rotary drive device 5, that is, the disk device using the rotary drive device 5 is not operating. Rotational drive device 5 shown in FIG.
In the non-operating state, an axial gap L2 is provided between the air bearing surface 12b of the ring-shaped member 12 and the air bearing surface 2e of the spindle hub 2. When assembling in such a state that the axial gap L2 is provided between the air bearing surface 12b of the ring-shaped member 12 and the air bearing surface 2e of the spindle hub 2, as described in Embodiment 4 above. It is preferable to use the spacer 18 by providing the housing 43 with the slit 43g.

Instead of providing the piezoelectric member 18, the ring-shaped member 12 made of a material having a high coefficient of thermal expansion may have a heat source such as a filament built therein.

In operation, when the rotary drive device 5 is activated, a voltage is supplied to the piezoelectric member 19 and the piezoelectric member 19 expands in the axial direction to increase its thickness. The air bearing surface 12b may move in the axial direction toward the air bearing surface 2e of the spindle hub 2 by a predetermined amount to provide an axial gap L1 (L2> L1) between the air bearing surfaces 2e and 12b. it can. This state is shown in FIG.

The operation of the air bearing surfaces 2e, 12b constructed by such a structure and assembling method is the same as the squeeze operation described in the first embodiment, and therefore the detailed description thereof is omitted here.

Next, the effect of the air bearing surfaces 2e and 12b will be described. Since the effect of the air bearing surfaces 2e and 12b configured by such a structure and the assembling method is qualitatively similar to the squeeze effect described in the first embodiment, detailed description thereof will be omitted and different points. Only shown. During the operation of the rotary drive device 5 shown in FIG. 14B, the axial gap between the air bearing surface 12b of the ring-shaped member 12 and the air bearing surface 2e of the spindle hub 2 should be greatly reduced to L1. You can As a result, the vibration damping force applied to the rotary drive device 5 is greatly increased, vibration of the rotary drive device 5 and eventually the disk is reduced, and a magnetic disk device capable of achieving a high recording density can be provided. In the non-operation shown in FIG. 14A, the ring-shaped member 1
By providing a large gap in the axial direction between the second air bearing surface 12b and the air bearing surface 2e of the spindle hub 2 as L2, it is possible to prevent damage due to a collision between the two due to a disturbance such as an impact. A highly reliable magnetic disk device can be provided.

As the piezoelectric member 19, one ring-shaped member may be used, or a plurality of partial ring-shaped members may be used. (Embodiment 7) FIGS. 13 and 14 are sectional views of a disk drive apparatus according to Embodiment 6 of the present invention, but the disk drive apparatus according to Embodiment 7 has the same structure.

The feature of the first disk drive device according to the seventh embodiment of the present invention is that the air bearing surface 2e provided on the spindle hub 2 and the air provided on the ring-shaped member 12 facing the air bearing surface 2e. The present invention relates to means for setting the gap between the bearing surface 12b and a predetermined amount L1. This will be explained below. As shown in FIG. 13A, the air bearing surfaces 2e and 12b are in surface contact with each other when the rotary drive device 5 is stopped, but when the rotary drive device 5 is activated, a voltage is supplied to the piezoelectric member 19. Then, the axial thickness of the piezoelectric member 19 contracts, and
As shown in (b), the air bearing surface 1 of the ring-shaped member 12
2b moves in the axial direction by a predetermined amount, and air bearing surfaces 2e, 1
An axial gap is created between the 2b and 2b. The processes up to this point are the same as those of the disk drive device according to the sixth embodiment of the present invention.

In the seventh embodiment, next, the presence or absence of contact between the air bearing surface 2e of the spindle hub 2 and the air bearing surface 12b of the ring-shaped member 12 is detected. Air bearing surface 2
Although e and 12b are parallel smooth surfaces in terms of design, it is impossible to make the waviness completely zero and the parallelism completely zero in the actual machined surface. Therefore, it is conceivable that when the relative rotational positional relationship between the two changes, the axial gap changes and they come into contact during the operation shown in FIG. 13 (b).

Therefore, if the spindle hub 2 is in operation.
When the ring-shaped member 12 comes into contact with the ring-shaped member 12, the ring-shaped member 12 is further moved in the axial direction by a predetermined amount, and then contact detection is performed again. This is repeated until the two do not contact each other.

However, in this method, it is not possible to finally know how much the gap between them is. Therefore, it is conceivable that they will come into contact with each other due to the subsequent thermal deformation or vibration impact. Therefore, after the two are no longer in contact with each other, the ring-shaped member 12 may be further moved in the axial direction by a predetermined amount set separately to widen the gap. The predetermined amount for further widening the gap is the air bearing surface 2e of the spindle hub 2 and the ring-shaped member 12 due to thermal deformation or vibration impact.
It is preferable to allow for the reduction amount of the axial gap between the air bearing surface 12b and the air bearing surface 12b.

As the means for detecting the contact between the spindle hub 2 and the ring-shaped member 12, the rotational torque of the disk drive device in the non-energized state described with reference to FIG. 7 in the third embodiment of the present invention or FIG. 8 is used. The rotational runout of the disk drive device described above can be used. Therefore, a specific description of the contact detection means is omitted here. Alternatively, a piezoelectric member may be used as the contact means. The piezoelectric member has a characteristic of generating a voltage when a slight force is applied from the outside. In the case of contact, since a high frequency voltage is generated, this may be used for contact detection. According to this method, it is possible to detect contact between the spindle hub 2 and the ring-shaped member 12 during operation, and when contact between the two is detected,
By changing the supply voltage to the piezoelectric member 19, the ring-shaped member 1
By moving 2, it is possible to increase the axial clearance between the two.

The operation of the air bearing surfaces 2e and 12b having such a structure and assembling means is the same as the squeeze operation described in the first embodiment, and therefore the description thereof is omitted here.

Next, the effect of the air bearing surfaces 2e and 12b will be described. Since the effect of the air bearing surfaces 2e and 12b configured by such a structure and the assembling method is qualitatively similar to the squeeze effect described in the first embodiment, its details are omitted and different. Only points are shown. Here, the gap between the air bearing surface 12b of the ring-shaped member 12 and the air bearing surface 2e of the spindle hub 2 can be reduced to, for example, 10 μm or less.
As a result, the vibration damping force to the rotary drive device 5 is greatly increased, the rotary drive device 5 and thus the disk vibration is reduced, and a magnetic disk device capable of realizing a high recording density can be provided. In addition, the air bearing surface 12b of the ring-shaped member 12
By providing the air bearing surface 2e of the spindle hub 2 and the air bearing surface 2e of the spindle hub 2 when they are not in operation, it is possible to prevent damage due to collision of both due to external disturbance such as impact, and to provide a highly reliable magnetic disk device. You can

Next, a disk drive device according to the seventh embodiment will be described with reference to FIG. Here, FIG.
When the rotary drive device 5 shown in FIG. 4A or the disk device using the rotary drive device 5 is not operating, no voltage is applied to the piezoelectric member 19, and the air bearing surface 1 of the ring-shaped member 12 is not applied.
An axial gap L2 is provided between 2b and the air bearing surface 2e of the spindle hub 2.

On the other hand, when the rotary drive device 5 is activated, a voltage is supplied to the piezoelectric member 19 as shown in FIG. 14B, the piezoelectric member 19 expands in the axial direction, and the ring-shaped member 12 The air bearing surface 12b moves in the axial direction by a predetermined amount, and an axial gap L1 smaller than that in the case of FIG. 14A can be provided between the air bearing surfaces 2e and 12b. The processes up to this point are the same as those of the disk drive device according to the sixth embodiment of the present invention.

Here, next, the air bearing surface 2e of the spindle hub 2 and the air bearing surface 12b of the ring-shaped member 12.
Detects the presence or absence of contact with. Air bearing surface 2e, 12b
Is not in contact, the ring-shaped member 12 is further moved in the axial direction by a predetermined amount in the direction in which the air-bearing surface 12b of the ring-shaped member 12 approaches the air-bearing surface 2e of the spindle hub 2, and contact detection is performed again. I do. This is repeated until they contact each other. When they come into contact with each other, the ring-shaped member 12 is then moved in the returning direction by a predetermined amount so that the air bearing surfaces 2e and 12b are provided with an axial gap so that they do not come into contact with each other. In this method, since it is not known how much the gap between the two finally exists, it is possible that the two come into contact with each other due to subsequent thermal deformation or vibration impact. Therefore, after the two are no longer in contact with each other, the ring-shaped member 12 may be further moved in the axial direction by a separately set predetermined amount to widen the gap. The predetermined amount for further widening the gap should be the reduction amount of the axial gap between the air bearing surface 2e of the spindle hub 2 and the air bearing surface 12b of the ring-shaped member 12 due to thermal deformation or vibration impact. Is preferred.

Both contact detecting means can be constructed in the same manner as in the sixth embodiment. According to this, it is possible to detect the contact between the spindle hub 2 and the ring-shaped member 12 during the operation, and when the contact between the both is detected, the supply voltage to the piezoelectric member 19 is changed. It is also possible to move the ring-shaped member 12 to increase the axial clearance between them.

The operation of the air bearing surfaces 2e, 12b constructed by such a structure and assembling method is the same as the squeeze operation described in the first embodiment, and therefore detailed description thereof will be omitted here.

Next, the effect of the air bearing surfaces 2e and 12b will be described. Since the effect of the air bearing surfaces 2e and 12b configured by such a structure and the assembling method is qualitatively similar to the squeeze effect described in the first embodiment, detailed description thereof will be omitted and different points. Only shown. That is, here, the air bearing surface 12b of the ring-shaped member 12 and the air bearing surface 2e of the spindle hub 2 are arranged.
The gap between and can be reduced to, for example, 10 μm or less. As a result, the vibration damping force to the rotary drive device 5 is greatly increased, the vibration of the rotary drive device 5 and eventually the disk is reduced, and a magnetic disk device capable of achieving high recording density can be provided. Further, by providing a large gap in the axial direction between the air bearing surface 12b of the ring-shaped member 12 and the air bearing surface 2e of the spindle hub 2 when not in operation, damage due to collision between the two due to disturbance such as impact is prevented. This makes it possible to provide a highly reliable magnetic disk device.

(Embodiment 8) Embodiment 8 of the present invention will be described below with reference to FIG. Since the structure of the disk drive device in the disk device shown in FIG. 15 is similar to that of the disk drive devices according to the sixth and seventh embodiments of the present invention shown in FIG. 13, only the part according to the eighth embodiment will be described. Will be briefly described below.

That is, in the disk drive device in which the ring-shaped member 12 facing the spindle hub bottom surface 2d is provided in the housing 43 and the air bearing surfaces 2e and 12b are formed with the two surfaces facing each other as smooth surfaces. 12
The piezoelectric member 19 is provided between the housing and the housing 43, and the ring-shaped member 1 is formed by using the adhesive 14 or the like via the piezoelectric member 19.
2 is fixed to the housing 43. The piezoelectric member 19 is electrically connected to a voltage supply source, and in operation, a predetermined amount of axial direction is provided between the air bearing surface 2e of the spindle hub 2 and the air bearing surface 12b of the ring-shaped member 12 facing the air bearing surface 2e. A gap is provided. Up to this point, the structure is the same as that of the disk drive device according to the seventh embodiment of the present invention.

Characteristic features of the disk device according to the eighth embodiment of the present invention will be described below. A shock of several hundred G may be applied to this disk device during operation. When the axial gap L has a very small value of 10 μm or less, it is conceivable that the air bearing surfaces 2e and 12b come into contact with each other due to a large impact. In order to prevent this, in the disk drive device according to the eighth embodiment of the present invention, the acceleration sensor 21 is provided on the circuit board (the same figure (a)) or the casing 43 (the same figure (b)), and the preset value or more When the acceleration of the ring-shaped member 12 is applied,
Is moved in the axial direction by a predetermined amount to move the air bearing surfaces 2e, 12
b Expand the axial gap between them. It is preferable that this predetermined amount is set in consideration of the amount of reduction in the axial gap between the air bearing surface 2e of the spindle hub 2 and the air bearing surface 12b of the ring-shaped member 12 due to impact. The piezoelectric member 19 may be used as the acceleration sensor 21.

The operation of the air bearing surfaces 2e, 12b constructed by such a structure and assembling method is the same as the squeeze operation described in the first embodiment, and therefore the detailed description thereof is omitted here.

Next, the effect of the disk drive device provided with the acceleration sensor 21 and the air bearing surfaces 2e and 12b will be described. The air bearing surface 2e configured in this way,
Since the effect of 12b is qualitatively similar to the squeeze effect described in the first embodiment, detailed description thereof will be omitted and only different points will be shown. When the gap between the air bearing surface 12b of the ring-shaped member 12 and the air bearing surface 2e of the spindle hub 2 is reduced to, for example, 10 μm or less, it is possible that the two come into contact with each other due to a large impact. However, based on the fact that the acceleration sensor 21 detects an impact applied from the outside, the axial gap between the air bearing surfaces 2e and 12b is widened to prevent damage due to collision of the two, and to provide a highly reliable magnetic disk device. Can be provided.

(Embodiment 9) FIG. 16 is a sectional view of a disk drive device according to Embodiment 9 of the present invention. FIG.
Since the structure of the disk drive device shown in FIG. 6 is similar to the disk drive devices according to the first to eighth embodiments of the present invention, only the specific structure of the portion related to the features of the ninth embodiment will be described here. The details will be described. Spindle hub bottom 2
The ring-shaped member 12 opposed to d is provided in the housing 43, and the two surfaces of the spindle hub bottom surface 2d and the ring-shaped member 12 that oppose each other are air bearing surfaces 2e and 12e.
In the disk drive device provided as b, a groove is formed on the air bearing surface 12b so as to generate a dynamic pressure by a pumping action as the rotary drive device 5 rotates. Regarding the method of installing the ring-shaped member 12 in the housing 43 and providing a predetermined amount of axial clearance in the air bearing surfaces 2e, 12b, any one of the methods described in the first to seventh embodiments of the present invention can be used. Should be used.

FIG. 17 is a plan view of the air bearing surface in the disk drive device according to the ninth embodiment of the present invention. As shown in FIG. 17A, the air bearing surface 12b of the ring-shaped member 12 is provided with a herringbone-shaped dynamic pressure groove 22. Alternatively, as shown in FIG. 17 (b), the air bearing surface 12 b of the ring-shaped member 12 is provided with a convex portion 25 that generates a dynamic pressure.

The air bearing surfaces 2e, 12 having such a structure.
The operation of b will be described below. Due to the rotation of the rotary drive device 5, the air in the gap between the air bearing surfaces 2e and 12b flows, and a dynamic pressure is generated in the groove 22 or the convex portion 25 by the pumping action. Due to this dynamic pressure, the air bearing surface 12b
Rotatably supports the air bearing surface 2e. A dynamic pressure groove or a convex portion may be provided on the air bearing surface 2e. Further, such a configuration of the ninth embodiment can be used together with any of the configurations of the first to eighth embodiments.

The air bearing surfaces 2e, 12 having such a structure.
The effect of b will be described below. Dynamic pressure groove 22 or convex portion 25 provided on the air bearing surface 12b of the ring-shaped member 12.
The dynamic pressure generated in the rotatably supports the air bearing surface 2e, that is, the rotary drive device 5, so that the rotary drive device 5
It is possible to provide a magnetic disk device capable of achieving a high recording density by significantly improving the vibration damping force of the disk drive, reducing the vibration of the rotation drive device 5, and eventually the disk.

(Embodiment 10) FIG. 18 is a sectional view of a disk drive apparatus according to Embodiment 10 of the present invention. In the disk drive device shown in FIG. 18, detailed description of the same parts as those of a general disk drive device will be omitted. The structure characterized in Embodiment 10 of the present invention is that the flange portion 2a of the spindle hub 2 has an outer peripheral side surface 2g.
And a ring-shaped member 12 having an inner peripheral side surface 12e facing the outer peripheral side surface 8 is provided in the housing 43, and these two surfaces 2g, 12e facing each other are smooth surfaces and the squeeze air bearing surfaces 2e, 12b. Has been configured.

The inner peripheral side surface 12e of the ring-shaped member 12 is preferably provided concentrically with the outer peripheral side surface 2g of the flange portion 2a, but eccentricity occurs due to dimensional errors of parts and the like. To deal with it, the squeeze air bearing surface 2
A structure and a method for assembling the e and 12b in a concentric or centered state will be described. First, the centering structure is the outer peripheral side surface 2g of the flange portion of the spindle hub 2 and the disk receiving surface 2
chamfer 2h provided at the intersection with c, chamfer 12g provided on the inner peripheral side surface 12e of the ring-shaped member 12,
The chamfer 2h and the chamfer 12g are located at substantially the same axial position. Further, the aligning jig 23 includes an inner peripheral ring 23A provided with an inner peripheral inclined surface 23a having substantially the same diameter as the chamfer 2h, and an outer peripheral ring 23B provided with an outer peripheral inclined surface 23b having substantially the same diameter as the chamfer 12g. The inner peripheral ring 23A and the outer peripheral ring 23B are concentrically arranged and are axially movable relative to each other by fitting with a very small clearance. As a matter of course, the chamfer 2h has an outer peripheral side surface 2g, the chamfer 12g has an inner peripheral side surface 12e, and the inner peripheral inclined surface 23a1 has an inner peripheral ring 23a.
The outer peripheral inclined surface 23b1 is provided concentrically with the outer peripheral ring 23b.

A method of concentrically assembling the disk drive device and the air bearing surfaces 2e, 12b provided with such an aligning structure will be described. When the inner peripheral ring 23A is moved to press the inner peripheral inclined surface 23a in the axial direction toward the chamfer 2h of the outer peripheral side surface 2g of the flange portion, when the both contact over the entire circumference, the inner peripheral surface 2g of the flange portion and the inner peripheral surface A concentric state with the ring 23a is obtained, and at this time, it is in a stable state, so that both are kept in this state. Next, the outer peripheral ring 23B is moved to press the outer peripheral inclined surface 23b axially toward the chamfer 12g of the ring-shaped member inner peripheral side surface 12e. Inner peripheral side surface 12e and outer peripheral ring 2
A concentric state with 3B is obtained, and at this time, since it is in a stable state, both are kept in this state. Therefore,
The air bearing surface 12b provided on the inner peripheral side surface 12e of the ring-shaped member 12 is disposed concentrically with respect to the air bearing surface 2e provided on the flange outer peripheral side surface 2g via the aligning member 23. Here, for example, the outer peripheral side surface 12h of the ring-shaped member 12 is adhered and fixed to the housing 43 with the adhesive 14. FIG. 18 shows a state after the ring-shaped member 12 is thus attached by adhesion.

The operation of the air bearing surfaces 2e, 12b constructed by such a structure and assembling method is the same as the squeeze operation described in the first embodiment, and therefore the detailed description thereof is omitted here.

Next, the effect of the air bearing surfaces 2e and 12b will be described below. Since the effect of the air bearing surfaces 2e and 12b configured by such a structure and the assembling method is qualitatively similar to the squeeze effect described in the first embodiment, detailed description thereof will be omitted and different points. Only shown. Air bearing surface 12b of the ring-shaped member 12
The gap between the air bearing surface 2e of the spindle hub 2 and the air bearing surface 2e can be reduced to, for example, 10 μm or less. As a result, the vibration damping force to the rotary drive device 5 is greatly increased, the vibration of the rotary drive device 5 and eventually the disk is reduced, and a magnetic disk drive capable of achieving high recording density can be provided.

The disk drive device shown in the first to tenth embodiments is a shaft rotary disk drive device in which the shaft 9 rotates, but the present invention is applied to a shaft fixed disk drive device. Also has similar actions and effects.

In the first to tenth embodiments, the number of disks may be one or plural.

[0168]

As described above, according to the present invention, by providing the squeeze air bearing or the dynamic pressure bearing on the bottom surface of the spindle hub, it is possible to reduce the disk vibration excited by air due to the high speed rotation of the disk device. As a result, it is possible to provide a magnetic disk device capable of achieving high recording density.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a magnetic disk device using a disk drive device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing displacement in (0,0) and (0,1) modes of a magnetic disk device.

FIG. 3 is a sectional view of a main part of a disk device using another disk drive device according to the first embodiment of the present invention.

FIG. 4 is a sectional view of a disk drive device according to a second embodiment of the present invention.

FIG. 5 is a sectional view of another disk drive device according to the second embodiment of the present invention.

FIG. 6 is a sectional view showing a holding means for a ring-shaped member in a disk drive device according to a second embodiment of the present invention.

FIG. 7 is a sectional view of a disk drive device according to a third embodiment of the present invention.

FIG. 8 is a diagram showing rotational torque when the disk drive device of the present invention is not energized.

FIG. 9 is a diagram showing rotational runout of the disk drive device of the present invention.

FIG. 10 is a sectional view of a disk drive device according to a fourth embodiment of the present invention.

FIG. 11 is a sectional view of a disk drive device according to a fifth embodiment of the present invention.

FIG. 12 is a sectional view showing a vibration mode in a disk device using a disk drive device according to a fifth embodiment of the present invention.

FIG. 13 is a sectional view of a disk drive device according to a sixth embodiment of the present invention.

FIG. 14 is a sectional view of another disk drive device according to the sixth embodiment of the present invention.

FIG. 15 is a sectional view of a disk drive device according to an eighth embodiment of the present invention.

FIG. 16 is a sectional view of a disk drive device according to a ninth embodiment of the present invention.

FIG. 17 is a plan view of an air bearing surface in a disk drive device according to a ninth embodiment of the present invention.

FIG. 18 is a sectional view of a disk drive device according to a tenth embodiment of the present invention.

FIG. 19 is a perspective view showing a configuration that is widely and generally used in a conventional magnetic disk device.

FIG. 20 is a sectional view showing the configuration of a squeeze air bearing plate in a conventional magnetic disk device.

[Explanation of symbols]

1 disc 2 spindle hub 2e Air bearing surface 5 Disk drive 12 Ring-shaped member 12b Air bearing surface 14 Adhesive 15 jigs 17 Gap adjustment screw 19 Piezoelectric member 23 Aligning jig 43 housing

Claims (40)

[Claims] 1. A spindle hub on which an information recording disk is mounted is rotatably supported in a housing, and a ring-shaped member whose surface faces a bottom surface of the spindle hub is provided in the housing. A disk drive device comprising a squeeze air bearing composed of a bottom surface and a surface of the ring-shaped member facing the bottom surface. 2. The disk drive device according to claim 1, wherein a viscoelastic member is provided between the ring-shaped member and the housing. 3. The disk drive device according to claim 1, wherein the ring-shaped member is formed integrally with the housing. 4. The ring-shaped member is fixed to the housing in a state in which the position in the axial direction is adjusted with respect to the bottom surface of the spindle hub, and the ring-shaped member is fixed to the housing. The disk drive described. 5. The ring-shaped member has a held portion, and the housing is a holding means capable of positioning the ring-shaped member in the axial direction by moving the ring-shaped member while holding the held portion. 5. The disk drive device according to claim 4, further comprising a hole through which 6. A spindle-shaped member on which an information recording disk is mounted is rotatably supported in a housing, and a ring-shaped member whose surface is opposed to the bottom surface of the spindle hub is provided in the housing. When assembling a disk drive device that constitutes a squeeze air bearing with the bottom surface and the surface of the ring-shaped member facing the bottom surface, after contacting the bottom surface of the spindle hub with the surface of the ring-shaped member facing the bottom surface, A method of assembling a disk drive device, wherein the ring-shaped member is moved in the axial direction, and a predetermined amount of axial gap is provided between the two facing surfaces. 7. A compressible member that is provided between the ring-shaped member and the housing and is capable of generating an axial force that causes the surface of the ring-shaped member to contact the bottom surface of the spindle hub by being compressed. The ring-shaped member is brought into contact with the bottom surface of the spindle hub by the axial force of the compressible member and then moved and fixed in the axial direction, so that the ring-shaped member and the bottom surface of the spindle hub have a predetermined amount. 2. The disk drive device according to claim 1, wherein the disk drive device is configured so that an axial gap can be provided. 8. The disk drive device according to claim 5, wherein the held portion is formed by a convex portion or a concave portion. 9. The disk drive device according to claim 5, wherein the held portion is made of a magnetic material or a magnet. 10. The ring-shaped member has a held portion, and the housing has a holding means capable of positioning the ring-shaped member in the axial direction by moving the ring-shaped member while holding the held portion. 8. The disk drive device according to claim 7, further comprising a hole through which the compressible member can seal around the hole. 11. A feed screw is screwed onto the ring-shaped member, and the ring-shaped member is configured such that its position in the axial center direction is adjusted with respect to the bottom surface of the spindle hub by the rotation of the feed screw. 4. The disk drive device according to claim 1, wherein the disk drive device is a disk drive device. 12. At least one of the feed screw and the ring-shaped member is fixed to the housing in a state where the ring-shaped member is axially adjusted with respect to the bottom surface of the spindle hub by the rotation of the feed screw. The disk drive device according to claim 11, wherein the disk drive device is a disk drive device. 13. After contacting two facing surfaces,
The ring-shaped member is moved in the axial direction by a certain amount in order to provide an axial gap, and then contact detection of the two surfaces is performed. If there is contact, the ring-shaped member is further contacted with a certain amount of axial movement. 7. The method for assembling a disk drive device according to claim 6, wherein the detection is performed and the detection is repeated until there is no contact. 14. After the surface of the ring-shaped member and the bottom surface of the spindle hub are no longer in contact with each other, the ring-shaped member is further moved in the axial direction by a predetermined amount, and the axial gap between the two surfaces facing each other. 14. The method for assembling a disk drive device according to claim 13, wherein the number of disk drives is increased. 15. The method for assembling a disk drive device according to claim 13, wherein the contact between the two surfaces is detected by detecting the rotational torque of the spindle hub when the spindle hub is not rotationally driven. . 16. The method of assembling a disk drive device according to claim 13, wherein the contact between the two surfaces is detected by detecting the rotational runout of the spindle hub. 17. A plurality of feed screws are provided, and the ring-shaped member is moved by the same feed amount by each of the feed screws, and a predetermined amount of axial gap is maintained while keeping the two facing surfaces parallel to each other. The disk drive device according to claim 11, wherein the disk drive device can be formed. 18. The method according to claim 11, wherein the axial movement of the ring-shaped member can be detected by detecting the rotational torque of the feed screw.
The disk drive device according to any one of 1. 19. The feed screw has a head, and it is possible to detect that the ring-shaped member has moved in the axial direction by the fluctuation of the rotational torque when the head is locked to another member. 19. The disk drive device according to claim 18, wherein: 20. The feed screw is a male screw, and the ring-shaped member is provided with a female screw to which the male screw is screwed. The screw head provided on the male screw is locked to the housing, 12. The disk drive device according to claim 11, wherein the axial movement of the male screw is restricted so that the male screw and the ring-shaped member can be axially positioned. 21. A spindle hub on which an information recording disk is mounted is rotatably supported in a housing, and a ring-shaped member whose surface faces the bottom surface of the spindle hub is provided in the housing, and the spindle hub of the spindle hub is provided. When assembling a disk drive device that constitutes a squeeze air bearing with the bottom surface and the surface of the ring-shaped member facing the bottom surface, a spacer is interposed between the bottom surface of the spindle hub and the surface of the ring-shaped member facing the bottom surface. The spindle hub and the ring-shaped member are axially positioned with respect to each other, and then the spacer is removed to provide a predetermined amount of axial gap between the two facing surfaces. Disk drive assembly method. 22. The spindle hub has a disc-shaped extending portion extending in the outer peripheral direction at the bottom thereof, the disc-shaped extending portion forming the bottom surface of the spindle hub, and the disc-shaped extending portion forming the bottom surface of the spindle hub. 2. The disk drive device according to claim 1, wherein the outer diameter of the disk is larger than the inner diameter of the data area of the information recording disk. 23. At least (0,1) of the natural vibration of the spindle section including the information recording disk and the spindle hub.
23. The disk drive device according to claim 22, wherein, in the (0,0) mode, the phases of vibrations of the disk-shaped extending portion and other portions of the spindle hub are the same. 24. A voltage-displacement conversion member is provided between the ring-shaped member and the housing, and a voltage is applied to the voltage-displacement conversion member, whereby the shaft of the ring-shaped member relative to the bottom surface of the spindle hub. 4. The disk drive device according to claim 1, wherein the disk drive device is configured so that the position in the axial direction is adjusted. 25. The bottom surface of the spindle hub and the surface of the ring-shaped member are in surface contact with each other when no voltage is applied to the voltage-displacement converting member, and when the voltage is applied to the voltage-displacement converting member. 25. The disk drive device according to claim 24, wherein an axial gap is formed between the bottom surface of the spindle hub and the surface of the ring-shaped member. 26. The surface of the ring-shaped member is away from the bottom surface of the spindle hub when no voltage is applied to the voltage-displacement conversion member, and when the voltage is applied to the voltage-displacement conversion member, The surface of the ring-shaped member approaches the bottom surface of the spindle hub, and an axial gap of a predetermined size is formed between the bottom surface of the spindle hub and the surface of the ring-shaped member. 25. The disk drive device according to claim 24, which is characterized in that. 27. An axial gap can be formed between the bottom surface of the spindle hub and the surface of the ring-shaped member by the thermal expansion of the ring-shaped member. The disk drive device according to item 1. 28. The ring-shaped member relative to the bottom surface of the spindle hub by applying a voltage to a voltage-displacement conversion member provided between the ring-shaped member and the housing or by thermally expanding the ring-shaped member. The position of the member in the axial direction is adjusted, and the position of the member is adjusted.
17. A method for assembling a disk drive device according to any one of 15 and 16. 29. The ring with respect to the bottom surface of the spindle hub by applying a voltage to a voltage-displacement conversion member provided between the ring-shaped member and the housing, or by utilizing thermal expansion of the ring-shaped member. The axial position of the ring-shaped member is adjustable, and the two members facing each other are spaced apart in the axial direction, and the ring-shaped member is placed at the first position in the direction in which the two surfaces approach each other. Move only a fixed amount,
Thereafter, contact detection of the two surfaces is performed, and if they are not in contact, the ring-shaped member is further moved by the first predetermined amount, and the movement of the ring-shaped member of the first predetermined amount is performed by the 7. The disk according to claim 6, wherein when the two surfaces come into contact with each other, the ring-shaped member is moved by a second predetermined amount in a direction in which the two surfaces move away from each other. Drive assembly method. 30. Detecting contact between two surfaces,
30. The ring-shaped member is moved in a direction in which the two surfaces are further apart after the ring-shaped member is moved by a second predetermined amount in a direction in which the two surfaces are separated from each other. Disk drive assembly method. 31. The contact detection of two surfaces is performed by using a voltage-displacement conversion member.
0. A method for assembling a disk drive device according to item 0. 32. A means for detecting contact between the bottom surface of the spindle hub and the surface of the ring-shaped member facing the bottom surface of the spindle hub when the spindle hub is rotationally driven is provided, and the voltage-displacement conversion member has these two components. 27. The ring-shaped member is configured to be movable in a direction away from the spindle hub when it is detected that the surfaces are in contact with each other, 27. Disk drive. 33. The disk drive device according to claim 32, wherein the voltage-displacement conversion member also serves as contact detection means. 34. Acceleration detection means is provided so that the distance from the bottom surface of the spindle hub to the surface of the ring-shaped member can be increased when an impact of a predetermined value or more is applied. Claims 24, 2 characterized in that
The disk drive device according to any one of 5, 26, 27, 32, and 33. 35. A spindle hub on which an information recording disk is mounted is rotatably supported in a housing, and a ring-shaped member whose surface is opposed to the bottom surface of the spindle hub is provided in the housing. A disk drive device comprising means for generating a dynamic pressure between a bottom surface and a surface of the ring-shaped member facing the bottom surface. 36. The dynamic pressure generating means is a convex portion or a concave portion formed on at least one of the bottom surface of the spindle hub and the surface of the ring-shaped member facing the bottom surface of the spindle hub. Disk drive. 37. A ring-shaped member, which rotatably supports a spindle hub on which an information recording disk is placed, and which has an outer peripheral surface or an inner peripheral side surface facing an inner peripheral surface or an outer peripheral side surface of the spindle hub. A disk drive device, wherein an air bearing is provided on the casing, and an air bearing is constituted by an inner or outer side surface of the spindle hub and an outer or inner side surface of the ring-shaped member facing the side surface. 38. The disk drive device according to claim 37, wherein the air bearing is either a squeeze air bearing or a dynamic pressure bearing. 39. A first chamfer is formed on the inner or outer side surface of the spindle hub, and a first chamfer is formed on the outer or inner side surface of the ring-shaped member facing the inner or outer side surface of the spindle hub. A second chamfered portion, and the first chamfered portion and the second chamfered portion are formed on the inner peripheral ring of the aligning member in which the inner peripheral ring and the outer peripheral ring are concentrically arranged. Of the first chamfered portion is contactable with one of the first and second chamfered portions, and the fourth chamfered portion formed on the outer peripheral ring of the aligning member is the chamfered portion of the first and second chamfered portions. 39. The disk drive device according to claim 37, wherein the spindle hub and the ring-shaped member are configured to be aligned with each other by being able to contact the other. 40. Any one of claims 1 to 5,
Or any one of claims 7 to 12, or any one of claims 17 to 20, or claim 2
A magnetic disk device comprising the disk drive device according to any one of claims 2 to 27 or claim 32 to 39.