JP2813268B2 - Magnetic disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive, and more particularly to an improvement in a head positioning mechanism.

[0002]

2. Description of the Related Art As one type of magnetic disk device used as an external storage device such as an electronic computer, a disk as a magnetic storage medium is rotated and a head is moved on the disk so that the head can arbitrarily change the surface of the disk. There is known a device in which information is written or read at the position of (1).

This magnetic disk drive has a structure as shown in FIG. 7, for example. FIG. 7 shows a magnetic disk drive of the type in which the head is positioned by moving the head in the radial direction of the rotating disk by causing the carriage to perform a linear motion. The disk a is fitted and fixed to the spindle b. The spindle is held by a spindle bearing d in the housing c. The spindle motor e is installed in the housing, and coupling the shaft to the spindle. Head f
Is attached to the guide arm g via a gimbal. The guide arm is installed on the carriage h.
Carriage roller in this by rolling on rails in the housing and moving the head in the radial direction of the disk. Driving is performed by an actuator having a co-yl and the magnet. The coil i is attached to the carriage, and the magnet is fixed to the housing together with the member j that holds the coil, and the carriage makes the linear movement by the electromagnetic action of the coil and the magnet.

In such a magnetic disk drive, the carriage h moves by the electromagnetic action of the coil and the magnet.
At this time, the magnet and the member j carrying the magnet are receiving a reaction force. Since this member is directly fixed to the housing c , the reaction force is directly transmitted to the housing, and further transmitted to the spindle b via the spindle bearing d. Spindle bearings are relatively rigid
Is small, a spring-mass system is formed in which the spindle bearing is a spring and the spindle is a mass, and the spindle vibrates together with the disk. Since the spindle bearing has almost no viscosity, the vibration peak at the resonance frequency becomes high, so that the carriage cannot sufficiently follow this vibration, and a positioning error of the head occurs.
In the following description, such vibration will be referred to as spindle vibration. FIG. 8 shows the relationship between spindle vibration and head positioning accuracy. The horizontal axis represents the frequency, and the vertical axis represents the displacement of the head, that is, the positioning error of the head. In the above-described magnetic disk drive, when the excitation frequency component of the reaction force against the member on the housing side of the actuator matches the natural frequency of the spindle, the viscosity of the spindle bearing is small. And the positioning accuracy of the head is reduced.

In order to prevent spindle vibration and improve head positioning accuracy, see, for example, Japanese Patent Application Laid-Open No. 64-39.
In Japanese Patent No. 685, a member on the housing side of the actuator is supported by a leaf spring and a shear rubber damper, and the natural frequency of the member on the housing side is made lower than the spindle frequency as shown by reference numeral B in FIG. By doing so, the spindle vibration is reduced. Further, U.S. Pat.
In No. 42, connected The rewritable to move the member in a housing side in the same direction as the seek direction of the head, the housing-side member to the diaphragm-type air spring in the housing of the actuator, the diaphragm-type movement of the housing member It is regulated by an air spring to reduce spindle vibration.

[0006]

Problems to be Solved by the Invention
In the magnetic disk drive disclosed in Japanese Patent Application Laid-Open No. 5 (1999) -2000, even if the natural frequency of the member on the housing side of the actuator is made lower than the natural frequency of the spindle, and the vibration is attenuated by the shear rubber damper, as shown by reference numeral B in FIG. In addition, the natural frequency of the spindle is higher than that of the housing side member, and the spindle and the housing vibrate integrally on a leaf spring between the magnetic circuit .
Then , because the carriage does not vibrate following these,
There is a limit in improving the positioning accuracy of the head. of course,
As shown by reference numeral C in FIG. 8, the natural frequency of the housing-side member of the actuator is sufficiently reduced .
If this is the case, the positioning accuracy of the head can be improved by making the carriage follow the movement of the spindle and the housing by utilizing the high compressibility in the low frequency range of several tens of Hz or less in the servo system. However , since the leaf spring cannot have a large amplitude, the natural frequency of the housing-side member of the actuator cannot be reduced so much, and the positioning accuracy of the head can not be improved.

In the magnetic disk drive disclosed in US Pat. No. 3,643,242, the member on the housing side of the actuator is supported by linear bearings. The amplitude at low frequencies can be increased. However, diaphragm type air spring, since the attenuation characteristic is not good, the reaction force to cause draw resonance when applied to the housing side member of the actuator, the amplitude of the housing side member is also several times the normal amplitude. If the amplitude is excessive, the diaphragm deforms in an unscheduled direction, the spring constant rapidly increases, and the acceleration of the vibration applied to the housing changes suddenly, so that the positioning accuracy of the head decreases.

An object of the present invention is to provide an improved magnetic disk drive which can eliminate the influence of the positioning accuracy of the head due to the vibration of a member on the housing side of the actuator based on the reaction force generated at the time of head seeking. It is in.

[0009]

In order to achieve the above object, the present invention provides a head assembly including a disk, a drive mechanism for supporting and rotating the disk, and a head for performing operations of writing and reading information to and from the disk. A mechanism that supports the head assembly, a mechanism that guides the support mechanism so that the head moves on the disk, a housing that carries these mechanisms, a coil and a magnet, and one of these is a support mechanism. An actuator carried on the other side by the housing, a guide mechanism for causing the support mechanism to move in the same direction as the movement direction of the support mechanism on a member on the housing side, and when the actuator causes the head to make the movement. In the actuator due to the reaction force generated in the actuator An air spring having a throttle for attenuating vibration generated in a member on the housing side, and a member on the support mechanism side of the actuator is provided with a spring for regulating a relative positional relationship with members around the housing. It is provided in between.

[0010]

When a current is passed through the coil of the actuator, a mechanism for supporting the head assembly, such as a carriage and a swing arm, linearly moves or swings due to the electromagnetic action of the coil and the magnet to perform the movement required for positioning the head. Let it. When the actuator is actuated, a member on the housing side of the actuator receives a reaction force. However , the air spring attenuates the vibration of the housing side member of the actuator based on this reaction force, and significantly reduces the vibration transmitted to the components of the disk drive mechanism such as the spindle and the spindle bearing via the housing. The vibration of the disk is minimized, and the positioning accuracy of the head is improved. Further, in the magnetic disk apparatus of the present invention, even when a reaction force that causes a resonance of the housing side member of the actuator is generated, because the damping force of the air spring is increased by the throttle,
Amplitude decreases, the excitation force against components of the disk drive mechanism is reduced, not to reduce the positioning accuracy of the head. In addition, since the spring disposed between the housing-side member of the actuator and the housing always regulates the relative positional relationship between the housing-side member of the actuator and the peripheral members in the movable range of the member, these impact based on the interference of the member is not generated, the playable row with at me that coupled with not affected by the vibration based on the reaction force, the positioning of the head pole Umate have high accuracy caused by head seek the aforementioned .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnetic disk drive according to the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a magnetic disk drive of the type in which the head moves linearly in the radial direction of the disk.

The housing 11 is mounted on an apparatus frame 14 via a vibration isolating rubber 13. The housing itself is 2
And these housing parts are fastened by bolts. Inside the housing,
A disk, a drive mechanism for supporting and rotating the disk,
A head assembly including a head for writing and reading information to and from a disk, a carriage for supporting the head assembly, and a mechanism for guiding the carriage so that the head moves on the disk are housed.

The disk 15 is fitted and fixed on a spindle 16. The spindle is held by a spindle bearing 17 in the housing 11. The spindle motor 18 is installed in the housing 11 couples the shaft to the spindle 16. The head 19 is attached to the end of the guide arm 20 via a gimbal. The guide arm is provided on the carriage 21.
Carriage roller 22 which is attached thereto by rolling on rails 23 supported in the housing 11, and the head 19 is linearly moved in the radial direction of the disk 15. Driving is performed by an actuator. The actuator linearly moves the carriage 21 by the electromagnetic action of the coil and the magnet. The coil 24 is incorporated in the carriage 21, and the magnet is attached to the supporting member 26.

In this magnetic disk drive, a guide mechanism for causing the member 26 carrying the magnet to move in the same direction as the moving direction of the carriage 21 and a reaction force generated when the actuator moves the carriage 21 are used. An air spring 30 having an aperture for attenuating vibration generated in the magnet holding member 26, and a relative position between the magnet holding member 26 and peripheral members such as the carriage 21 and the coil 24 on the carriage within the movable range of the magnet holding member 26. It is provided with a spring 32 for regulating the relationship. FIG. 3 shows details around the support member 26.

The portion of the housing 11 containing the actuator and the like includes a main body 12A and a cover 12B.
Consists of An opening 33 is provided at an end of the main body 12A, and an opening 34 is provided on one of the side surfaces. Cover 12
B is arranged so as to cover the opening 33 at the end, and is connected to the main body 12A by a bolt.

The support member 26 is incorporated in the main body 12A of the housing via a linear bearing 31 . Li <br/> near bearing 31, as shown in FIG. 2, it is arranged at right angles to the surface of the disk 15 in the housing 11, and reducing the thickness or height of the housing 11. The cage holding the needle roller and the ball in one of the linear bearings is fixed to the housing 11, while the other is fixed to the leaf spring 35. Leaf spring 35
Are arranged so as to cover the above-mentioned opening on the side surface of the main body 12A, and both ends are fixed to the main body 12A by bolts. Stops 36 made of rubber or the like are attached to the main body 12A at respective moving ends of the magnet holding member 26.

The air spring 30 includes a flexible hollow member is disposed in a stationary member and the opposite side is disposed on one side of the hollow member in order to identify the deformation direction of the hollow member and movable you coupled to the magnet bearing member 26 It is a member I equity. Of these, the hollow member is designated by the reference numeral 37 and is formed of a thin-cylindrical shaped fluororubber having a curved peripheral surface and open ends. The stationary member is constituted by the end wall of the housing 11, and the hollow member 37 is fixed to the housing end wall by a stopper member 38. The stop member has a disk shape, is disposed inside the opening of the hollow member 37 so as to contact the inner surface of the wall forming the outer opening of the hollow member 37, and is fixed to the main body 12A of the housing by bolts. ing. The movable member 39 is composed of a substrate and a ring having a through hole including a stop 40 at the center. The substrate is the magnet holding member 2 in the hollow member 37.
6 is arranged inside the hollow member 37 so as to contact the outer surface of the wall forming the opening facing 6 and the ring is arranged so as to contact the inner surface of the wall forming the opening facing the magnet carrying member 26. , Bolted to the substrate. Substrate is attached by a rod 41 to the magnet bearing member 26. The spring 32 for positioning the magnet is provided between the substrate in the movable member 39 and the housing 1.
1 and a spring arranged between the substrate of the movable member 39 and the cover 12B forming the housing 11. Each of the spring is constituted by two coil springs which are disposed coaxially.

In this magnetic disk drive, the head 1
The positioning of 9 is performed by operating the spindle motor 18, rotating the disk 15 together with the spindle 16, passing a current through the coil 24 of the actuator, moving the carriage 21, and controlling the current flowing through the coil 24. You. When head seek is performed, the carriage 21 will be subjected to because reaction force to move the electromagnetic action of the coil 24 and the magnet 25.

In the conventional apparatus, this reaction force is transmitted directly to the housing because the magnet or coil is directly carried by the housing, and further passes through a spindle bearing constituting a drive mechanism for rotating the disk. Was transmitted to the spindle. Since the spindle bearing has relatively low rigidity, a spring-mass system is formed with the spindle bearing as a spring and the spindle as a mass. Not only does the spindle resonate with the disk, but the spindle bearing has almost no viscosity, so the resonance peak is low. It has become a pretty high-casting
Was .

[0021] However, in the magnetic disk device according to the invention, based on the reaction force air spring 30 is generated by the head seek to attenuate the vibration of the magnet-carrying member 26, it is transmitted to the spindle 16 via the housing 11 <br The vibration of the spindle 16 is reduced by reducing vibration . And example even if the reaction force that causes a resonance of the magnet 25 and the bearing member 26 is generated by the head seek, because the damping force of the air spring 30 is larger by the throttle 38, the amplitude is small, Excitation on the spindle bearing 17 and the spindle 16 is also reduced, and does not affect the positioning accuracy of the head .
Further, the leaf spring 35 disposed between the magnet holding member 26 and the housing 11 prevents interference between the magnet 25 and the coil 24 and between these and other components, and there is no shock generated by the interference. What cooperation with a not affected by the reaction force generated by the head seek, with the positioning of the head at a very Umate high have precision
Obtain line.

Further, in this magnetic disk drive, the magnet holding member 26 is supported by the housing 11 via the linear bearing 31 and the magnet holding member 26 can be moved with low friction. The component force of the reaction force
The phenomenon transmitted to the spindle 16 via the shaft and vibrating the spindle can be minimized. Furthermore, the linear bearing 31, because it is symmetrical positions on either side of the magnet carrier member 26, the vibration mode is symmetrical, no influence against the positioning accuracy of the head is small, moreover, with guidance against the carriage 21, Surface of disk 15 or spindle 16 with sufficient space
Since it is arranged in pairs to the direction perpendicular to, it can keep the increase in the magnetic disk device size to a minimum. In addition, the flexible hollow member 37 constituting the air spring 30 is prevented from being deformed in the lateral direction by the end wall of the housing 11 and the movable member 38 disposed inside the housing. Is prevented without any special member, the structure of the air spring 30 is simplified, and the air spring 30 can be made compact . Moreover, since the deformation is only in-plane deformation, reliability is improved.
Coincide with high life also not long. Then, the hollow member 37 is formed of a fluororubber gas evolution is not very low, since the damping even Life has by utilizing air within the housing, the housing interior is maintained in a clean head and disk surface Does not pollute. Furthermore, even if the spring 32 maintains the relative initial position of the magnet 25 and the coil 24 and the magnet 25 and the support member 26 are installed in a tilted state, or the entire magnetic disk device is tilted,
Since the magnet 25 and there is no interference or interference between these and other components of the coil 24 can also be prevented decrease in the positioning accuracy of the head that is based on the shock generated by interference. The leaf spring 35 prevents the frictional resistance of the linear bearing 31 from increasing due to the difference in the thermal expansion coefficient between the housing 11 and the supporting member 26 . Further, even if there is an assembly error, the linear bearing 31 can be brought into contact with the magnet holding member 26 by absorbing the error, so that
Combined with the fact that it does not interfere even if assembled as described above,
Obtain easy to line Te because very implementation.

FIG. 4 shows another configuration of a magnetic disk drive of the type in which the head makes a linear motion in the radial direction of the disk.

The housing 111 is mounted on the device frame 114 via the vibration-proof rubber 113. The housing itself consists of two parts, which are fastened by bolts. Inside the housing, a disk, a drive mechanism for supporting and rotating the disk, a head assembly including a head for writing and reading information to and from the disk, a carriage for supporting the head assembly, and moving the disk on the head A mechanism for guiding the carriage so as to perform the operation is accommodated.

The disk 115 is fitted and fixed to a spindle 116, and the spindle is held by a spindle bearing 117 in a housing 111. The spindle motor 118 is installed in the housing 111 couples the shaft to the spindle 116. The head 119 is attached to the guide arm 120 via a gimbal, and the guide arm is installed on the carriage 121. The carriage 121, the roller 122 in this by rolling on rails 123 supported on housing 111 and is the head 119 is moved in the radial direction of the disk 115. The movement of the carriage is performed by an actuator. The actuator causes the carriage to move by the electromagnetic action of the coil and the magnet.
In, with up each magnet to the housing 111
To have.

[0026] In the magnetic disk device of this, member carries a magnet in A lipped <br/> Yueta 126
Are mounted on the housing 111 via a guide mechanism such as a linear bearing 127 having a low frictional resistance so as to be movable in the same direction as the carriage 121 . Arranged such that vibrations are attenuated by Ma Gune'<br/> preparative bearing member 126 is an air spring 130 disposed between the housing 111
Is done. The magnet is also moved by a coil spring 132 disposed between the housing 111 and the carriage 12.
1. Arranged so as not to interfere with the coil 124 on the carriage. The air spring 130 comprises a flexible hollow member 136, a stationary member formed by a housing end wall located on one side of the hollow member, and a movable member 138 disposed between the opposite side of the hollow member and the magnet carrying member 126. Has become . With room or space 142 in the interior of the variable rotary members 138 are provided,
A through hole having a diaphragm 140 that connects the internal space 142 and the internal space of the hollow member 136 is provided. By fixing the housing 111 by a retaining member attached which is not shown the hollow member 136 against the housing, coupling the magnet bearing member 126 is movable member 1
38 is connected to the magnet holding member 126.

The positioning of the head is performed by the spindle motor 1
18 is operated and rotates the disk 1 15 together with the spindle 116, current flows to the coil 124 of the actuator moves the carriage 121,
This is done by controlling the current flowing through the coil 124. When the head seek is performed, the carriage 1
Reference numeral 21 receives a reaction force because a seek force is obtained by the electromagnetic action of the coil 124 and the magnet inside the support member 126 . Air spring 130, based on the reaction force generated by the head seek, the magnet bearing member 126
The vibration transmitted to the spindle 116 via the housing 111 is reduced . And example even if the reaction force that causes a resonance of the magnet and the bearing member 126 is generated by the head seek, size by the damping force aperture 140 of the air spring 130
Because are Kuna', amplitude is small, excitation against the spindle bearings 117 and the spindle 116 even smaller, does not affect the positioning accuracy of the head 119. Furthermore, the magnet bearing member 126 and a coil spring 132 disposed between the housing 11 1 coil 124
Interference with the magnets in the support member 126 and between these and other components are prevented, and there is no impact generated by the interference. Head positioning
Obtain line in a very Umate high not accuracy.

FIG. 5 shows still another configuration of a magnetic disk drive of the type in which the head makes a linear motion in the radial direction of the disk.

The housing 211 is mounted on the apparatus frame 214 via the rubber cushion 213. The housing itself consists of two parts, which are fastened by bolts. Inside the housing, a disk, a drive mechanism for supporting and rotating the disk, a head assembly including a head for writing and reading information to and from the disk, a carriage for supporting the head assembly, and moving the disk on the head A mechanism for guiding the carriage so as to perform the operation is accommodated.

The disk 215 is fitted and fixed to a spindle 216, and the spindle is held by a spindle bearing 217 in the housing 211. The spindle motor 218 is installed in the housing 211 couples the shaft to the spindle 216. The head 219 is attached to the guide arm 220 via a gimbal, and the guide arm is installed on the carriage 221 . The carriage 221, the roller 222 in this by rolling on rails 223 supported on housing 211, and the head 219 is moved in the radial direction of the disk 215. The carriage is driven by an actuator. The actuator moves the carriage by the electromagnetic action of the coil and the magnet.
And attach the magnet to the housing 211
To have.

In this magnetic disk drive, the member 226 carrying the magnet in the actuator is also used.
Is mounted on the housing 211 via a guide such as a linear bearing 227 having low frictional resistance so as to be movable in the same direction as the carriage 221 . Carrier member 22
6 is an air spring 23 disposed between the housing 211
0 by attenuating vibrations, magnet housing 21
The carriage 221 by a coil spring 232 is disposed between the 1, so as not to interfere the like to the coil 224 on the carriage. Air spring 230, similar to the magnetic disk device described in connection with FIGS. 1 and 2, between the end and the magnet bearing member 226 in the opposite housing end wall in a flexible hollow member 236 and the hollow member It comprises a movable member 238. Air spring 230 This is disposed outside the housing 211, attached to the frame 214 of the magnetic disk device. Mounting, like the air spring in the magnetic disk device shown in FIGS. 1 and 2, are fixed to the hollow member 236 to the apparatus frame 214 by a retaining member which is not shown. The rod 24 extending from the movable member 238 is connected to the magnet holding member.
3 is connected to the magnet holding member 226 via an opening in the end wall of the housing 211 and a seal 244 fixed to the housing 211.

The positioning of the head is performed by the spindle motor 2
18 is operated and rotates the disk 215 together with the spindle 216, and flow of current to the coil 224 of the actuator, The rewritable moves the carriage 221, it has been made by controlling the current through the coil 224. When the head seek is performed, the carriage 221 receives a seek force due to the electromagnetic force of the coil 224 and the magnet in the holding member 226, and thus receives a reaction force. However, the air spring 230 attenuates the vibration of the magnet holding member 226 based on the reaction force generated by the head seek, and reduces the vibration transmitted to the spindle 216 via the housing 211 .
Even example there be a reaction force that causes a resonance of the magnet and the bearing member 226 is generated by the head seek and, since the damping force of the air spring 230 is increased by the throttle 240, amplitude is small, the spindle excitation against the bearing 217 and the spindle 216 is reduced and influence the positioning accuracy of the head 219
No. Further, a coil spring 232 disposed between the magnet holding member 226 and the housing 212 prevents interference between the coil 24 and the magnets on the holding member 226 and between these and other components, and an impact generated by the interference. since there is no, it can coupled with not affected by the reaction force generated by the head seek, obtain line positioning of the head at a very Umate high not accurate. Further, in this magnetic disk drive, the air spring 230 is
Since the damping force of the air spring 230 is not transmitted to the spindle 216, the positioning accuracy of the head 219 can be further improved as compared with other embodiments.

FIG. 6 shows a magnetic disk drive of the type in which the head is positioned by a swing arm that pivots around a point outside the disk.

The housing 311 is not shown
It consists of two parts, is fastened by bolts, and is installed on the device frame via vibration-proof rubber. Inside the housing, the disk drive mechanism for supporting the disc and rotating head assembly including a head for writing and reading operations of information against the disc, the swing arm for supporting the head assembly is housed.

The disk 315 is fitted and fixed to the spindle 316. The spindle is held by a spindle bearing 317 incorporated in the housing 311. The spindle motor 318 is installed in the housing 311 couples the shaft to the spindle 316.
The head 319 is attached to the guide arm 320 via a gimbal. The guide arm 320 is supported by the swing arm 321. Swing arm, inside disposed parallel to the spindle 316 and the housing cover and is fixed to the shaft 32 3 held in the bearing 32 2 to the housing 311, the rotation of the shaft 32 3, the head movement on the disk 319 I'm making it. The actuator that drives the swing arm
The coil 324 on the shaft 32 3, Installing up each magnet 325 in member 326 to rotate the shaft 32 3 by the electromagnetic action of the coil and the magnet, thereby made to swing the swing arm 321.

In this magnetic disk drive, the member 326 carrying the magnet 325 in the actuator is used.
Bearing 331 but arranged on the shaft 32 3 coaxially
By swingably attached to the housing 31 1 in the same direction as the swing arm 321, the magnet 325 is a swing arm 321 by the coil spring 3 32 disposed between the housing 31 1, interfering with a coil 324 on the carriage do not be positioned so
You. Then, it is attenuated by the air spring 3 30 with the vibration generated in the swing arm 321 in between the housing 311 when positioning the head.

Shaft 32 having swing arm 321
3 extends outside the housing 311, and a coil 324 is fixed to an extended end. Member 326 carrying the magnets 325 is held in a bearing 331 in the housing 311 positioned on the shaft 32 3 coaxially,
It can rotate independently of the shaft 32 3. The coil spring 332 includes the support member 326 and the housing 311.
It is located between. The air spring 330 is shown in FIG.
2, a flexible hollow member 336 and a movable member 338 between an end of the hollow member opposite to the end wall of the housing and the magnet holding member 326, similarly to the magnetic disk drive described with reference to FIG. I have. The mounting on the housing is performed in the same manner as in the magnetic disk drive shown in FIGS.
The housing 31 is provided with a stop member (not shown).
By securing the member extending from 1, the bond between the magnet bearing member 3 26 movable member 3 38 supported member 3
Ru made by binding to 26.

The head is positioned by the spindle motor 3
18 to activate the disk 315 and the spindle 316
Rotate them together and connect them to the coil 324 of the actuator.
When the current is supplied and the swing arm 321 is moved,
By controlling the current flowing through the coil 324,
Done. When head seek is performed, swing
321 is an electromagnetic force between the coil 324 and the magnet 325.
Because it is swung by the action, it receives a reaction force.
At this time, in this magnetic disk device, the air spring 33
0 is based on the reaction force generated by the head seek.
The vibration of the gnet supporting member 326 is attenuated and the housing
The vibration transmitted to the spindle 316 via 311
Decreasing. MaThe gnet and the support member 326 are shared.
Reaction force that causes vibration is generated by head seek
However, the damping force of the air spring 330 is
Greater by 40BecomeBecause, ShakeSmall width
For pindle bearing 317 and spindle 316versus
The vibration that occurs is also small, and the positioning accuracy of the head 319 is reduced.
Affectsdo not do.Further, the magnet holding member 326 and
A coil spring disposed between the housing 311
332 causes interference between the magnet 325 and the coil 324 and
Interference between these components and other parts
There is no impact,
The position of the head, combined with the fact that it is not affected by force
A decisionveryGive meHighWith high accuracylineI can. In addition, magnet
The holding member 326 is the bearing 331And the magnet
Magnetic member 326 can be moved with low friction.
The reaction force generated by the head seek that the air circuit receives
Force is transmitted to the spindle 316 via the housing 311.
ReachedResuMinimize vibration of pindle 316
be able to. And the air spring 330 is constituted.
Flexible hollow member 336Is the housing 311
The movable member 33 disposed inside this8And by
So that it does not deform laterallyHas become.Toes
And lateral deformation is prevented without special members.
Therefore, the structure of the air spring 330 is simplified,
0 can be made compact, and
Reliability due to only in-plane deformationHighAnd lifeLong
No. And the flexible hollow member 336Generates gas
ofSmallMade of no fluorine rubber, damping also housing
Because the air inside is used, the inside of the housing
Section is kept clean, contaminating the head and disk surface
do not do.

[0039]

Magnetic disk apparatus according to the present invention exhibits, as mentioned above, it is possible to reduce the vibration and shock generated in the disk when the head seek can row Ukoto the positioning of the head with high have precision .

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a magnetic disk drive of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view showing details around a carriage.

FIG. 4 is a sectional view showing another embodiment of the magnetic disk drive of the present invention.

FIG. 5 is a sectional view showing still another embodiment of the magnetic disk drive of the present invention.

FIG. 6 is a sectional view showing still another embodiment of the magnetic disk drive of the present invention.

FIG. 7 is a sectional view of a conventional magnetic disk drive.

FIG. 8 is a diagram for explaining vibration characteristics in a conventional magnetic disk drive.

[Explanation of symbols]

11, 111, 211, 311 Housing 15, 115, 215, 315 Disks 16-18, 116-118, 216-218, 316-318 Disk drive means 19, 119, 219, 319 Heads 21, 121 , 221, 321 ... means for supporting the head assembly 22, 23, 122, 123, 222, 223, 322, 323 ... means for guiding the supporting means 24, 25, 124, 125, 224, 225, 324, 325 ... actuator 26 , 126, 226, 326 ... Guide means for housing side members 30, 130, 230, 330 ... Air springs 36, 136, 236, 336 ... Hollow members 38, 138, 238, 338 ... Movable stationary side members 39, 139, 239, 339… Movable side stationary side member 40, 140, 240, 340… Aperture

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 21/02 G11B 25/04 G11B 33/00

Claims (5)

(57) [Claims] 1. A disk, a drive mechanism for supporting and rotating the disk, a head assembly including a head for performing a write and read operation of information on the disk, a mechanism for supporting the head assembly, and a movement toward the disk. A mechanism for guiding a supporting mechanism to be made to be a head, a housing for carrying these mechanisms, an actuator including a coil and a magnet, one of which is carried by the supporting mechanism and the other of which is carried by the housing; A guide mechanism that causes the movement in the same direction as the movement direction of the head to the member on the housing side of the actuator; With diaphragm to attenuate changing vibration Comprising an air spring, a magnetic disk device member in the support mechanism side of the actuator is characterized in that it comprises a spring for restricting a relative positional relationship between the member Surrounding this between the housing. 2. An air spring is disposed inside the housing, the flexible hollow member and a stationary member disposed on one side of the hollow member to determine a direction of deformation of the hollow member, and an air spring disposed on the opposite side and the housing in the actuator. 2. The apparatus of claim 1 having a movable movable member coupled to the member on the side, wherein the aperture is located on one of the movable member and the stationary member located between the hollow member and the interior space of the housing. . 3. An air spring is disposed within the housing, the flexible hollow member and a stationary member disposed on one side of the hollow member to determine a direction of deformation of the hollow member, and an air spring disposed on the opposite side and the housing in the actuator. has a movable member coupled to a member on the side, according to claim 1 in which the diaphragm is provided positioned between the inner space of the inner space and the hollow member Ru movable member near. 4. An air spring is disposed outside the housing, the flexible hollow member and a stationary member disposed on one side of the hollow member to determine a direction of deformation of the hollow member, and an air spring disposed on the opposite side and the housing in the actuator. 2. The apparatus of claim 1 having a movable member coupled to the member on the side, wherein the aperture is located on one of the movable member and the stationary member located between the hollow member and the exterior space of the housing. 5. The device according to claim 3, wherein the stationary member is constituted by a housing.