WO2003001522A1

WO2003001522A1 - Disc apparatus

Info

Publication number: WO2003001522A1
Application number: PCT/JP2001/005358
Authority: WO
Inventors: Tomoki Yaguchi; Shinji Fujimoto; Yukihiro Komura; Kazuaki Miyajima
Original assignee: Fujitsu Limited
Priority date: 2001-06-22
Filing date: 2001-06-22
Publication date: 2003-01-03
Also published as: JP4108600B2; JPWO2003001522A1

Abstract

A disc apparatus includes a housing having a base, a disc having a plurality of tracks and rotatably attached in the housing, a head for writing/reading data to/from the disc, an actuator arm rotatably attached to the housing and having a tip end supporting the head, and a head actuator for moving the head across a track of the disc. Furthermore, the disc apparatus includes a spindle assembly for rotating the disc, a disc clamp for clamping the disc onto the spindle assembly, and a wire balancer attached to the disc clamp. The disc clamp has an inner circular land having a plurality of fixing holes, an outer circular land having a plurality of cut-off portions, and a circular groove formed between the inner and the outer circular land. The wire balancer is inserted into the circular groove and a part of the wire balancer is engaged with the inner or the outer circular land.

Description

Description Disk drive technology field

The present invention generally relates to a disk drive, and more particularly, to a wire balancer mounting structure and a stopper structure of a disk drive. Background technology

In recent years, magnetic disk devices, which are a type of external storage device for computers, are becoming smaller and thinner, and lower power consumption is required. In addition, an increase in the recording density of the magnetic disk is required to increase the capacity, and the number of magnetic disks mounted on the device is increasing. In recent magnetic disk devices, a flying magnetic head slider of a contact-start-stop (CSS) type is often used. With the CSS-type floating magnetic head slider, the magnetic head slider is in contact with the magnetic disk when the device is stopped, and when information is recorded and reproduced, the magnetic head slider is driven by air fluid generated on the surface of the magnetic disk that rotates at high speed. Flies with a small gap from the surface of the magnetic disk.

When the rotation of the magnetic disk stops, the head becomes the accessible area on the magnetic disk.

(CSS area), where the head and the magnetic disk come into contact. While the magnetic disk stops rotating, the head and the magnetic disk remain in contact. As described above, while the magnetic disk is rotating, the head floats on the magnetic disk with a small gap therebetween, so that a head crush or the like is generated due to slight dust or the like. For this reason, the magnetic disks and the magnetic heads for reading and writing data from and to these magnetic disks are arranged in a sealed chamber defined in a disk enclosure (housing).

The magnetic disk is driven to rotate by a spindle assembly having a motor. The spindle assembly includes a spindle shaft fixed to a housing and a spindle hub rotatably mounted around a spindle shaft by a pair of bearings. The magnetic disk and the annular spacer are alternately arranged on the spindle hap. By inserting the disk clamp into the spindle hub and fastening the disk clamp to the spindle hub, a plurality of magnetic disks are fixed to the spindle hub with a predetermined interval.

In such a disk fixing structure, imbalance in the rotation of the disk occurs due to a manufacturing error and / or an assembly error of each component of the spindle assembly. Therefore, usually, a wire balancer is attached to the disk clamp to absorb the imbalance of the disk rotation. Conventionally, a wire balancer is mounted in the annular groove of the disk clamp, and the wire balancer is held in the annular groove of the disk clamp by the panel force. However, since the wire balancer is held in the annular groove of the disk clamp only by its spring force, there is a possibility that the disk device may be displaced when an impact is applied to the disk device. In addition, there is a problem that it is difficult to remove the wire balancer because it is pressed against the inner peripheral surface of the ring land which forms an annular groove by panel force.

In recent magnetic disk drives, a rotary head actuator is generally used to move a head across a track of a magnetic disk. It is the actuator that limits the swing range of the head actuator. For example, if the head actuator runs out of control for some reason, the tip of the head actuator will stop. It serves to prevent the magnetic head attached to the disk from coming off the magnetic disk. In addition, the starting point of the servo track lighting is defined by the position of the outer stop.

In the conventional magnetic disk drive factory stopper mechanism, two holes are formed at predetermined locations in the base of the magnetic disk device, and a shaft is press-fitted into each of these holes, and each shaft is pressed. An annular buffer member was attached to the inner stopper to form an inner stopper or a fan stopper. The coil support arm of the head actuator contacted these stoppers, thereby limiting the swing range of the head actuator.

However, in such a conventional stopper structure, the shaft is formed as a separate part from the base, and the shaft is press-fitted into the hole of the base, thereby increasing the cost. There is a problem that press-fitting into the base causes metal contact and generates dust. Furthermore, in the conventional superstructure, the annular stopper is attached to the shaft. Since rubber was press-fitted and mounted, if a material with a large change in temperature characteristics-soft material was used for the stopper rubber, there was a problem that the rubber mounted on the shaft would shift. Disclosure of the invention

Therefore, an object of the present invention is to provide a disk device which can prevent the wire balancer from being displaced and which can be easily removed.

Another object of the present invention is to provide a disk device having a simple and inexpensive factory stopper mechanism.

According to an aspect of the present invention, a housing having a base; a disk having a plurality of tracks rotatably mounted in the housing; a head for writing / reading data to / from the disk; A head that is rotatably mounted on the housing and supports the head at a distal end thereof; and a head that moves the head across the track of the disk; A spindle assembly for rotating the disc; a disc clamp for fixing the disc to the spindle assembly; and a wire balancer attached to the disc clamp; the disc clamp having a plurality of fixing holes. An annular land, an outer annular land having a plurality of cutouts, An annular groove defined between the inner annular land and the outer annular land, wherein the wire balancer is mounted in the annular groove, and a part of the wire balancer is provided in the inner annular land and the outer annular land. A disk device is provided, which is locked to one of the annular lands.

Preferably, the inner annular land has a plurality of projections on its outer periphery, and the wire balancer has an arcuate locking portion at an intermediate portion thereof. The wire balancer is mounted in the annular groove so that the arc-shaped engaging portion is engaged with one of the protrusions of the inner annular land. Alternatively, the wire balancer has an engagement bend at least at one end. The wire balancer is mounted in the annular groove so that the bent portion for engagement is inserted into one of the notches and abuts against the inner peripheral surface of the outer land. As another alternative, the wire balancer has an arc shape in the middle It has a locking portion. The wire balancer is mounted in the annular groove such that the arc-shaped locking portion is inserted into one of the cutouts of the outer annular land and contacts the inner peripheral surface of the outer annular land.

According to another aspect of the invention, a housing having a base and a cover secured to the base; a disk having a plurality of tracks rotatably mounted within the housing; and writing data to the disk. A head for performing reading; and an actuator arm rotatably mounted on the housing and supporting the head at a distal end thereof, for moving the head across a track of a disk. A stopper that contacts the arm of the actuator and prevents the arm of the actuator from moving toward the inner side or the outer side by a predetermined amount or more; and the stopper includes: A disk device comprising: a shaft formed integrally with the base; and an annular buffer member mounted on the shaft. It is provide.

Head Actuy Yue has a coil support arm having a first height from the surface of the base. Preferably, the shaft has a second height lower than the first height, and the annular cushioning member is partially mounted on the shaft so as to be able to collide with the coil support arm. More preferably, the cover has a projection aligned with the shaft, the projection being inserted into the upper end of the annular cushioning member. Preferably, the stopper is formed integrally with the base on the side opposite to the coil supporting arm with respect to the shaft, the stopper being capable of contacting the annular cushioning member. BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is a plan view of the magnetic disk drive with the cover removed;

Fig. 2 is a sectional view taken along the line 2-2 in Fig. 1 with the cover fixed to the base;

FIG. 3A is a plan view of the first embodiment of the disc clamp;

Figure 3. B shows the first embodiment of the wire balancer;

FIG. 3C is a plan view of the state in which the wire balancer of FIG. 3B is mounted on the disk clamp of the first embodiment;

FIG. 4A is a plan view of a second embodiment of the disc clamp; FIG. 4B shows a second embodiment of the wire balancer;

FIG. 4C is a plan view of the wire balancer of FIG. 4B mounted on the disc clamp of the second embodiment;

FIG. 5A is similar to FIG. 4A, and is a plan view of a disc clamp according to a second embodiment; FIG. 5B is a diagram illustrating a wire balancer according to a third embodiment;

FIG. 5C is a plan view showing a state where the wire balancer of FIG. 5B is mounted on the disc clamp of the second embodiment;

FIG. 6A is a plan view of a disc clamp according to a third embodiment;

FIG. 6B is a diagram showing the calibrator of the fourth embodiment;

FIG. 6C is a plan view showing the state where the wire balancer of FIG. 6B is mounted on the disc clamp of the third embodiment;

Fig. 7 is a perspective view of the area around the actiyue block;

FIG. 8 is a sectional view of the superstructure according to the first embodiment;

FIG. 9 is a sectional view of the stopper according to the second embodiment;

FIG. 10 is a sectional view of a stopper according to the third embodiment.

Fig. 11 is a sectional view of the stopper according to the fourth embodiment.

Fig. 12 is a sectional view of the stopper according to the fifth embodiment.

Fig. 13 is a sectional view of the stopper according to the sixth embodiment.

Fig. 14 is a sectional view of the stopper according to the seventh embodiment.

FIG. 15 is a sectional view of a stopper according to the eighth embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, many embodiments of the present invention will be described with reference to the drawings. In the description of each embodiment, substantially the same components are denoted by the same reference numerals. Referring to FIG. 1, there is shown a plan view of the magnetic disk drive with the cover removed, and FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. As shown in FIG. 2, the housing (disk closure) 10 is composed of a base 12 and a cover 14 fixed to the base 12, and has a sealed chamber 1 inside. 5 is defined. In the circular opening 1 3 formed in the base 1 2 A part of the flange 62 of the pre 60 is inserted, and the flange 62 is fastened to the base 12 by a plurality of screws 64. A spindle shaft 16 is press-fitted and fixed to the flange 62.

The spindle motor shaft 16 has a DC motor station 66 having a coil 66 fixed thereto by bonding, and is connected to a DC motor port via a pair of bearings 68, 70. 72 are rotatably mounted. The inner race of the bearings 68, 70 is press-fitted and fixed to the spindle shaft 16, and the annular spindle hub Ί4 and the annular bush 80 are bonded to the outer race of the bearings 68, 70 by bonding. Each is fixed. An annular yoke 76 is adhered to the inner peripheral surface of the spindle hub 74, and an annular permanent magnet 78 is adhered to the inner peripheral surface of the annular yoke 76. A predetermined gap is formed between the permanent magnet 78 and the stay 65, and the permanent magnet 78 forms a magnetic circuit around the stay 65 in cooperation with the yoke 76. ing.

The outer peripheral surface of the annular bush 80 is adhered to the inner peripheral surface of the spindle hub 74. An annular groove 80a is formed in the annular bush 80, and an annular projection 62a fitted into the annular groove 80a is formed in the flange 62 as a whole. The labyrinth seal 82 is formed by the annular groove 80a and the annular projection 62a inserted into the annular 80a, and the grease oil mist applied to the bearing 70 is sealed in the sealing chamber 15 To prevent intrusion. A magnetic seal 84 is provided between the spindle shaft 16 above the bearing 68 and the spindle hub 74, and the oil mist of the grease applied to the bearing 68 is placed in the sealed chamber 15. To prevent entry.

The magnetic disk 22 and the annular spacer 86 are alternately inserted into the spindle hub 74, and a plurality of discs 18 are fastened to the spindle hub 74 with a plurality of screws 20. The magnetic disks 22 (four magnetic disks in the present embodiment) are fixed to the spindle hub 74 at a predetermined interval. The upper end of the spindle shaft 16 is fixed to the housing 10 by fastening the screw 38 to the spindle shaft 16 through a hole formed in the cover 14.

Referring again to FIG. 1, reference numeral 24 designates a mouth actuator comprising an actuator arm assembly 26 and a magnetic circuit 28. The arm arm assembly 26 rotates around the shaft 30 fixed to the base 12. It is mounted so that it can be rolled. The actuating overnight arm assembly 26 includes an actuating tab opening 32 mounted rotatably around the shaft 30 via a pair of bearings, and a plurality extending in one direction from the actuating evening block 32. And a head assembly 36 fixed to the distal end of each arm 34. Each head assembly 36 supports a magnetic head 38 for writing / reading data to / from a magnetic disk 22 and a magnetic head 38 at a distal end thereof, and a base end of the magnetic head 38 is provided with a magnetic head. Includes suspension 40 fixed to arm 34. ,

On the opposite side of the shaft 30 from the actuator arm 34, a coil support arm 42 is formed integrally with the actuator tab 32, and the coil support arm 42 is formed. Supports coil 4'4. The coil 44 is inserted into the gap of the magnetic circuit 28 to form the voice coil mode (VCM) 46. Reference numeral 48 denotes a flexible printed wiring board (FPC) for supplying a write signal to the magnetic head 38 or extracting a read signal 'from the magnetic head 38, and one end of the flexible printed circuit board is a fan. It is fixed to the side of the cutout block 32. An outer stop 52 and an inner stop 54 that restrict the swing range of the actuator arm assembly 26 are fixed to the base # 2.

Referring to FIG. 3A, a plan view of a disc clamp 18 according to the first embodiment of the present invention is shown. The disc clamp 18 is made of aluminum and has a center hole 88 into which the spindle hub 74 is inserted. The disc clamp 18 further includes an inner annular land 90 having a plurality of (six in the present embodiment) fixing holes 92 and an outer outer having a plurality of equally spaced cuts 97. It has an annular land 96 and an annular groove 98 defined between the inner annular land 90 and the outer annular land 96. The inner annular land 90 has a plurality of equally spaced projections 94 on its outer periphery.

Referring to FIG. 3B, a wireless balancer 100 of the first embodiment is shown. The wire balancer 100 is made of spring steel, and is previously bent into an arc shape. Further, the wire balancer 100 has an arcuate locking portion 102 which is bent at an intermediate portion. In a state where the wire balancer 100 is not mounted on the disk clamp 18, the spindle assembly 60 is driven to rotate the magnetic disk 22 at a high speed to perform a vibration test. The groove for detecting the rotational speed is provided on the inner ring land 90 of the disc clamp 18

9 3 are formed. In this vibration test, when the rotating body including the spindle assembly 60 and the magnetic disk 22 is unbalanced, vibration occurs, and which part of the groove 93 in the circumferential direction is the unbalanced point. Turns out. The wire balancer centered on the unbalance point of the disc clamp 18 found in this way

Attach 100 to disc clamp 18. That is, the wire balancer 100 is mounted in the annular groove 98 such that the arc-shaped engaging portion 102 is engaged with the projection 94 at the unbalance point of the annular annular land 90.

When the wire balancer 100 is mounted in the annular groove 98 as described above, the wire balancer 100 is pressed against the inner peripheral surface of the outer annular land 96 by its spring force. Since the arc-shaped locking portion 102 of the wire balancer 100 is locked to the projection 94, the wire balancer 100 is prevented from being displaced even when an impact is applied to the magnetic disk device. Is done. Furthermore, since the outer annular land 96 has a plurality of notches 97, the wire balancers 10 and 0 can be easily removed from the disc clamp 18 by inserting a pin or the like into one notch 97. It can be removed at any time.

Referring to FIG. 4A, a plan view of a disk clamp 18A of the second embodiment is shown. In the disk clamp 18A of the present embodiment, the inner annular land 90 has a circular outer peripheral surface, and does not have the plurality of protrusions 94 of the disk clamp 18 shown in FIG. 3A. Other configurations of the disc clamp 18 A are the same as those of the disc clamp 18. Referring to FIG. 4B, the wire balancer 104 of the second embodiment has bending portions 106 for engagement at both ends. The wire balancer 104 is bent in advance into an arc shape as shown in the figure.

Referring to FIG. 4C, a plan view showing a state where the wire balancer 104 is mounted on the disc clamp 18A is shown. When the wire balancer 104 is attached to the annular groove 98 of the disc clamp 18 A, the engaging bent portions 106 at both ends are inserted into the notches 97 of the outer annular land 96, respectively, and the wire balancer 104 is inserted. 4 is pressed against the inner peripheral surface of the outer annular land 96. Engagement bent section 106 inserted into notch 97 Therefore, even when a shock or the like is applied to the magnetic disk device, the wire balancer 104 does not shift with respect to the disk clamp 18A.

FIG. 5A is a plan view of a disk clamp 18A according to the second embodiment similar to that shown in FIG. 4A. Referring to FIG. 5B, a wire balancer 108 of the third embodiment having a bending portion 110 for engagement on one side is shown. The wire balancer 108 is previously bent into an arc shape as shown in the figure.

Referring to FIG. 5C, there is shown a plan view in which the wire balancer 108 is mounted in the annular groove 98 of the disc clamp 18A. The engaging bent portion 110 formed at one end of the wire balancer 108 is inserted into the notch 97, and the wire balancer 108 is an inner peripheral surface of the disc clamp 18A outer ring 96. Since the engaging bent portion 110 is inserted into the notch 97, the wire balancer 108 is able to contact the disk clamp 18A even when an impact is applied to the magnetic disk drive. No misalignment occurs.

Referring to FIG. 6A, a plan view of a disk clamp 18B of the third embodiment is shown. In the disk clamp 18B of the present embodiment, the width and pitch of the notch 97 'formed on the annular annular land 96 are the same as those of the disk clamps 18 and 18A of the first and second embodiments. It is formed to be larger than the opening 97. Other configurations of the present embodiment are the same as those of the disc clamp 18A shown in FIG. 4A. Referring to FIG. 6B, there is shown a gap balancer 112 of a fourth embodiment in which an arc-shaped locking portion 114 is formed in an intermediate portion. The balun balancer 112 is previously bent into an arc shape as shown in the figure.

Referring to FIG. 6C, there is shown a plan view in which the wire balancer 112 is mounted in the annular groove 98 of the disk clamp 18B. The arc-shaped locking portion 114 fits into the notch 97 ', and the wire balancer 112 is pressed against the inner peripheral surface of the annular annular land 96 and held. Since the arc-shaped locking portion 1 1 4 fits into the notch 9 7 ′, the wire balancer 1 1 2 can be positioned with respect to the disk clamp 18 B even when an impact is applied to the magnetic disk drive. A shift is prevented.

FIG. 7 is a rear perspective view of the circumference of the actuator block 32 of the actuator arm assembly 26. Coil support arm 4 2 that supports coil 4 4 By contacting the outer stopper 52 and the inner stopper 54, the operating range of the arm arm assembly 26 is restricted.

Referring to FIG. 8, there is shown a sectional view of the outer stopper 52 of the first embodiment. In the following description of each embodiment of the outer stopper, the outer stopper will be described, but the inner stopper has a structure similar to the structure of the outer stopper of each embodiment. The stop 52 is composed of a shaft 120 formed integrally with the base 12 and a cylindrical cushioning rubber 122 pressed into the shaft 120. Since the stopper 20 is formed integrally with the base 12, the number of parts can be reduced as compared with a conventional stopper, and the cost of the stopper can be reduced.

FIG. 9 is a cross-sectional view of the superstructure 52A of the second embodiment. An annular groove 121 is formed on the outer periphery of the shaft 120, and a cylindrical cushion rubber is formed in the annular groove 122. Attach 1 2 2. According to the present embodiment, vertical displacement of the cylindrical cushioning rubber 122 can be prevented.

Referring to FIG. 10, there is shown a sectional view of an outer stopper 52B of the third embodiment. In the outer stopper 5 2B of the present embodiment, the height of the shaft 124 formed integrally with the base 12 is lower than the height of the coiling support arm 42. With the 2 not attached, rotate the actuator arm assembly 26 into place and then shuffle the cylinder cushion 1 2 2 so that the cylinder cushion 1 2 2 can collide with the coil support arm 4 2 G Partially press fit into 124. In the present embodiment, since the storage shaft 124 is formed short, it is possible to rotate the actuator arm assembly 26 into a predetermined position, thereby facilitating the assembly of the rotary actuator 24. it can.

FIG. 11 is a cross-sectional view of the first embodiment 52C of the fourth embodiment. In this embodiment, the height of the shaft 124 is formed to be lower than the height of the coil support arm 42, and the cover 14 is integrally formed with the projections 126 aligned with the shaft 124. Is formed. The cylindrical cushioning rubber 128 is partially pressed into the shaft 124, and the projection 126 is inserted into the upper end of the cylindrical cushioning rubber 128. By inserting the projection 126 integrally formed with the cover 144 into the upper end of the cylindrical rubber cushion 128 in this manner, the shaft 124 of the cylindrical rubber cushion 128 is inserted. To prevent slipping Can be.

Referring to FIG. 12, there is shown a sectional view of an outer stop 52D of the fifth embodiment. In this embodiment, in addition to the configuration of the stopper 52 C of the fourth embodiment, the shaft 124 is formed integrally with the base 12 on the side opposite to the coil support arm 42. It is provided with the completed paper presser 130. Since the cylindrical presser rubber 1 2 2 deformed by the collision of the coil support arm 4 2 can be pressed by the stopper 1 330, the shaft 1 2 Dropout can be reliably prevented.

Referring to FIG. 13, there is shown a sectional view of an outer stopper 52E of the sixth embodiment. In the present embodiment, a cylindrical cushion rubber 13 2 having an H-shaped longitudinal section is employed, and a projection 1 2 6 ′ formed integrally with the cover 14 is formed to be long. 3 Insert the protrusion 1 2 6 ′ deep into the upper end of 2. With this structure, it is possible to reliably prevent the cylindrical buffer rubber 13 2 from coming off the shaft 124.

Referring to FIG. 14, there is shown a sectional view of an outer stopper 52F of the seventh embodiment. In the present embodiment, the stopper strength can be changed without changing the outer diameter by changing the inner diameter D 1 of the cylindrical cushioning rubber 13. For example, as shown in the figure, by making the inner diameter D 1 of the cylindrical cushioning rubber 13 3 smaller than the outer diameter of the projections 126, the super strength can be increased. According to the present embodiment, the material of the cylindrical cushioning rubber 13 3 is the same, and the strength of the stopper can be changed by changing only the inner diameter. Etc.), and the cylinder cushion rubber can be changed in a short time. Also, since the stopper strength can be adjusted only by changing the inner diameter, fine adjustment is possible.

Referring to FIG. 15, there is shown a cross-sectional view of an even stopper 52G of the eighth embodiment. In the present embodiment, a shaft 134 having a first mounting hole 135 at the upper end is formed integrally with the base 12. The cover 14 has a second mounting hole 13 7 aligned with the first mounting hole 13 5. The cushioning rubber 1 36 has a first projection 1 38 and a second projection 140 opposite to the first projection 1 38, and the first projection 1 38 is the first projection. The second projection 140 is fitted in the second mounting hole 135, and the second projection 140 is fitted in the mounting hole 135. Since the cushioning rubber 1336 of the present embodiment is formed from solid rubber, the strength of the cushioning rubber 1336 can be increased. Since it is inserted into the formed second mounting hole 1337, the cushion rubber 1336 can be reliably prevented from coming off. As a modified example of the present embodiment, by adopting a long cushion rubber, the shaft 13 4 is omitted, and the mounting holes are formed directly in the base 12 and the cover 14. Thus, a superstructure can be formed without a shaft. Industrial applicability

Since the present invention is configured as described in detail above, the displacement of the balancer mounted on the disc clamp can be reliably prevented, and the wire balancer can be easily removed as necessary. . Furthermore, since the shaft of the factory overnight stopper is formed integrally with the pace, the number of parts of the stopper can be reduced, and the cost of the stopper can be reduced. Also, since the stopper rubber is directly press-fitted into the shaft integrally formed on the base, there is no metal contact compared to the conventional configuration in which the shaft is press-fitted into the base, and dust is less likely to be generated. Further, since the shaft is formed integrally with the base, the positional accuracy of the stopper can be improved.

Claims

The scope of the claims

1. a housing with a pace;

A disk having a plurality of tracks rotatably mounted in the housing;

A head for writing / reading data to / from the disk;

A head actuator mounted rotatably on the housing and supporting the head at a distal end thereof, for moving the head across the track of the disk;

A spindle assembly for rotating the disk;

A disk clamp for fixing the disk to the spindle assembly; and a wire balancer attached to the disk clamp;

The disc clamp includes an inner annular land having a plurality of fixing holes, an outer annular land having a plurality of notches, and an annular groove defined between the inner and the outer annular land. ·

The disk device, wherein the wire balancer is mounted in the annular groove, and a part thereof is locked to one of the inner annular land and the outer annular land.

2. The inner annular land has a plurality of protrusions on its outer periphery, and the wire balancer has an arc-shaped locking portion at an intermediate portion thereof.

2. The disc according to claim 1, wherein the wire balancer is mounted in the annular groove such that the arc-shaped engaging portion is engaged with one of the projections of the inner annular ring.

3. The wire balancer has an engagement bend at least at one end thereof, and the wire balancer has the engagement bend inserted into one of the cutouts and on the inner peripheral surface of the outer annular land. 2. The disk device according to claim 1, wherein the disk device is mounted in the annular groove so as to abut.

The wire balancer has an arc-shaped locking portion at an intermediate portion, The wire balancer is configured such that the arc-shaped locking portion is inserted into one of the notches of the outer annular land and contacts the inner peripheral surface of the annular annular land. 2. The disk device according to claim 1, wherein the disk device is mounted on a disk.

5. a housing having a pace and a cover secured to the base;

A disk having a plurality of tracks rotatably mounted in the housing;

A head for writing / reading data to / from the disk;

A head actuating arm rotatably mounted on the housing and supporting the head at a distal end thereof, and a head actuating arm for moving the head across the track of the disc;

A stopper for abutting against the actuator arm to prevent the actuator arm from moving more than a predetermined amount toward the inner side or the outer side;

The disk device according to claim 1, wherein the stopper has a shaft integrally formed with the base and an annular buffer member mounted on the shaft.

6. The disk device according to claim 5, wherein the shaft has an annular groove on an outer periphery thereof, and the annular cushioning member is mounted in the annular groove.

7. The head actuator has a coil support arm having a first height from the surface of the base,

The shaft has a second height lower than the first height, and the annular cushioning member is partially mounted on the shaft so as to be able to collide with the coil support arm. The disk device according to claim 5.

8. The disk device according to claim 7, wherein the cover has a projection aligned with the shaft, and the projection is inserted into an upper end of the annular buffer member.

9. The disc according to claim 8, further comprising a stopper provided on the side opposite to the coil supporting arm with respect to the shaft, the stopper being capable of contacting the annular buffer member formed integrally with the base. apparatus.

10. The disk device according to claim 8, wherein the annular buffer member has a substantially H-shaped vertical cross section.

11. The annular cushioning member has an inner diameter smaller than an outer diameter of the projection. Item 14. The disk device according to Item 8.

12. A housing having a base and a cover secured to the base; a disk having a plurality of tracks rotatably mounted within the housing;

Head to write / read data to / from the disc overnight;

A head actuating arm rotatably mounted on the housing and supporting the head at a tip end thereof, and a head actuating arm for moving the head across the track of the disc; ;

A stopper that abuts against the actuator arm to prevent the actuator arm from moving more than a predetermined amount toward the inner side or the outer side;

A stopper formed integrally with the base and having a first mounting hole at an upper end thereof; a first projection; and a second projection opposite to the first projection. A bumper having a projection, wherein the first projection includes a buffer member fitted into the first mounting hole;

The force par has a second mounting hole aligned with the first mounting hole, and the second projection of the buffer member is fitted in the second mounting hole. And disk device. ·