JPH06302153A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent the rotation run-out in a vertical direction of a magnetic disk surface generated by the degradation in the rigidity of air bearings for supporting a spindle with a reduction in the size and thickness of the device by providing the device with the air bearings in the state of supporting the bearings with elastic supporting members. CONSTITUTION:The air bearings 22 in the form of holding the front and rear surfaces of the outer peripheral part of a magnetic disk 1 are disposed in the prescribed positions at least at one point in the outer peripheral part of the disk 1 in the state of supporting the air bearings by the elastic supporting members 23, etc. The disk 1 is rotated by a spindle part 21, by which the air flow generated by rotation of the disk 1 is blown to the front and rear surfaces of the disk 1 and the upper and lower spacings of the bearings 22 respectively facing these surfaces. A dynamic pressure is generated in the upper and lower spacings by this air pressure, by which the dynamic air bearings are formed and, therefore, the rotation run-out in the axial direction of the disk 1 passing the inside of the dynamic air bearings is suppressed. Then, the floating posture of the magnetic head 10 floating on the disk 1 surface is stabilized and the stable recording and reproducing operations are realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device used as an external storage device of a computer system, and more particularly to a device for preventing rotational runout of a magnetic disk surface in the axial direction which is caused by miniaturization of the magnetic disk device. It is related to the configuration.

In recent years, due to an increase in the amount of information processing in a computer system, the amount of information recorded on a magnetic disk device also increases, and a large capacity and a small size are being promoted. However, due to the downsizing of the magnetic disk device, a phenomenon in which the surface of the rotating magnetic disk swings in the axial direction due to a decrease in assembly accuracy in the spindle portion for rotating the magnetic disk, a decrease in rigidity of the ball bearing, etc.・ The flying attitude of the magnetic head for playback tends to be unstable. For this reason, it is necessary to prevent such rotational shake of the magnetic disk surface in the axial direction and stabilize the flying posture of the magnetic head with respect to the magnetic disk surface.

[0003]

2. Description of the Related Art In a conventional magnetic disk drive, as shown in a plan view of a main part of FIG. 5A and a side sectional view of the main part of FIG. 5B, a magnetic disk 1 is connected to a spindle 3 via a spindle hub 2.
The spindle 3 is rotatably supported by the base body 5 via two ball bearings 4a and 4b which are vertically arranged. The magnetic disk 1 is rotated by a rotary motor composed of a rotor 7 provided on the spindle hub 2 side around the spindle 3 and a stator 6 provided on the base body 5 side corresponding to the rotor 7.

Further, on the surface of the rotating magnetic disk 1,
A magnetic head 10 supported by a head arm 8 of an access mechanism (actuator) (not shown) via a support spring 9 is levitated in a minute gap, and the magnetic disk 1 is positioned by the access mechanism at a predetermined position.
Recording and reproducing information to and from.

The rigidity of the bearing for supporting the rotation of the spindle 3 is proportional to the size and installation span of the bearing, but it is desirable to use a small bearing to reduce friction loss during rotation. Further, since the assembling accuracy is relative, it is necessary to increase the assembling accuracy accordingly when the device becomes smaller.

[0006]

By the way, with the further miniaturization and thinning of the magnetic disk drive as described above, a smaller bearing is used as a bearing for supporting the spindle with a vertically short installation span. As a result, sufficient rigidity cannot be obtained for those bearings, which causes non-repetitive run-out of the rotating magnetic disk surface in the vertical direction (axial direction).
There is a problem that the fluctuation increases.

When it is difficult to improve the assembling accuracy due to such miniaturization, in addition to the non-repetitive swing of the surface of the rotating magnetic disk in the up-down direction (axial direction), repetitive swing The swing also becomes large.

Therefore, due to the non-repetitive and repetitive shake of the magnetic disk surface, the flying state of the magnetic head floating above the magnetic disk surface becomes unstable, and stable recording / reproducing operation becomes difficult. was there.

In view of the above-mentioned problems of the prior art, the present invention makes the bearing for supporting the spindle smaller and smaller even if the bearing is used with a short installation span in accordance with the miniaturization and thinning of the apparatus, and the vertical direction (axial) of the rotating magnetic disk surface is It is an object of the present invention to provide a novel magnetic disk device which prevents non-repetitive and repetitive shakes in the direction).

[0010]

In order to achieve the above-mentioned object, the present invention records and reproduces information by positioning a magnetic disk mounted on a spindle portion and an access mechanism at a predetermined position on the surface of the magnetic disk. In a magnetic disk device having a magnetic head for performing, at least one position of the outer peripheral portion of the magnetic disk is provided with an air bearing having a shape sandwiching the front and back surfaces of the outer peripheral portion of the magnetic disk supported by elastic supporting members. To do.

The air bearing is connected to the access mechanism so as to move in the radial direction of the magnetic disk, and
A magnetic head for recording and reproduction is arranged at each tip of the air bearing via a support spring.

Further, an electromagnetic conversion element for recording and reproduction is provided on the surface of the air bearing which faces the front and back surfaces of the magnetic disk, and the air bearing is moved in the radial direction of the magnetic disk by an access mechanism. To do.

[0013]

According to the present invention, at least one position of the outer peripheral portion of the magnetic disk mounted on the spindle portion is provided with an air bearing having a shape sandwiching the front and back surfaces of the outer peripheral portion of the magnetic disk supported by elastic supporting members, By rotating the magnetic disk, an air flow generated by the rotation of the magnetic disk is blown into the gaps between the front and back surfaces of the magnetic disk and the air bearings facing each other, and the air pressure forms a dynamic pressure air bearing.

As a result, the rotational runout of the magnetic disk passing through the dynamic pressure air bearing in the axial direction is suppressed, so that the flying posture of the magnetic head floating above the surface of the magnetic disk is stabilized, and stable recording / writing is performed. A playback operation can be realized.

Further, basically, since it is sufficient to suppress the rotational shake in the area where recording and reproduction are performed by the magnetic head on the surface of the magnetic disk, the magnetic disk is provided in a shape sandwiching the front and back surfaces of the outer peripheral portion. A magnetic head is provided at each tip of the air bearing via a support spring, or recording / recording is performed on the surface of the air bearing that faces the front and back surfaces of the magnetic disk.
A magnetic head on the surface of the magnetic disk or an electromagnetic conversion element for recording / reproduction is provided by arranging an electromagnetic conversion element for reproduction and arranging its air bearing to move in the radial direction of the magnetic disk by an access mechanism. Recorded by
Rotational shake in the axial direction in the reproduction area is suppressed.

Therefore, a stable recording / reproducing operation can be realized by the magnetic head in a stable flying posture on the surface of the magnetic disk.

[0017]

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 (a) and 1 (b) are views showing a first embodiment of a magnetic disk device according to the present invention. FIG. 1 (a) is a plan view of a main part, and FIG. 1 (b) is a main part of FIG. It is a side view.

In both of these figures, reference numeral 21 designates the magnetic disk 1 and the spindle hub 2 as in the conventional example shown in FIGS. 5 (a) and 5 (b).
Is fixed to a spindle 3 via a rotor 7, and the spindle 3 is rotatably supported by a base body 5 via two ball bearings 4a and 4b, and a rotor 7 provided around the spindle 3 on the spindle hub 2 side. And a stator 6 provided on the side of the base body 5 corresponding thereto, which is a spindle unit for rotating the magnetic disk 1 by a rotary motor.

Further, at least at a predetermined position on the outer peripheral portion of the magnetic disk 1, an air bearing 22 having a shape sandwiching the front and back surfaces of the outer peripheral portion of the disk is provided at an elastic supporting member 23 as shown in FIG. 1 (b). It is arranged in a state of being supported by the above.

When the magnetic disk 1 is rotated by the spindle portion 21, the air flow generated by the rotation of the magnetic disk is blown into the upper and lower gaps between the front and back surfaces of the magnetic disk 1 and the air bearings 22 which face each other. As a result, a dynamic pressure is generated in the upper and lower gaps by the air pressure to form a dynamic pressure air bearing, so that rotational deflection of the magnetic disk 1 passing through the dynamic pressure air bearing in the axial direction is suppressed.

Therefore, the flying attitude of the magnetic head 10 which is supported on the head arm (not shown) of the access mechanism 24 via the support spring 9 on the surface of the magnetic disk 1 and which is floating is stabilized, and stable recording / reproducing operations are realized. can do.

In the above embodiment, an example in which the air bearing 22 having a shape sandwiching the front and back surfaces of the outer peripheral portion is provided at one predetermined position on the outer peripheral portion of the magnetic disk 1 has been described. However, the present invention is not limited to this example, and for example, at two predetermined positions on the outer peripheral portion of the magnetic disk, or at three predetermined positions on the outer peripheral portion of the magnetic disk 1 as shown in the plan view of FIG. By providing the air bearings 22a, 22b, 22c having a shape sandwiching the front and back surfaces, it is possible to more effectively suppress the rotational runout of the magnetic disk 1 in the axial direction.

FIG. 3 is a side view of the essential parts showing a second embodiment of the magnetic disk apparatus according to the present invention, in which the same parts as those in FIG. 1 (b) are designated by the same reference numerals. The embodiment shown in this figure is shown in FIG.
The point different from the first embodiment of (b) is that the support spring 9 is provided at each predetermined position on the outer peripheral portion of the magnetic disk 1 at each tip portion of the air bearing 22 provided in a shape sandwiching the front and back surfaces of the outer peripheral portion of the magnetic disk 1.
While disposing the magnetic head 10 for recording and reproducing via
The air bearing 22 is provided with an elastic support member 23 to provide an access mechanism.
The actuator is attached to an (actuator) 24, and the air bearing 22 and the magnetic head 10 are moved by the access mechanism 24 in the radial direction of the magnetic disk 1.

With the structure of this embodiment, recording of information by the magnetic head 10 on the surface of the magnetic disk 1,
Alternatively, it becomes possible to suppress the rotational runout in the axial direction in the reproducing area and its vicinity, and the flying posture of the magnetic head floating above the magnetic disk surface is stabilized, and the first embodiment of FIG. Similarly, stable recording / reproducing operations can be realized.

FIG. 4 is a side view of the essential parts showing a third embodiment of the magnetic disk device according to the present invention, in which the same parts as those in FIG. 1 (b) are designated by the same reference numerals. The embodiment shown in this figure is shown in FIG.
The difference from the first embodiment of (b) is that the surface of the air bearing 22 that is provided at a predetermined position on the outer peripheral portion of the magnetic disk 1 in a shape sandwiching the front and rear surfaces of the outer peripheral portion faces the front and rear surfaces of the magnetic disk. A recording / reproducing electromagnetic conversion element 31 is disposed in a part as shown, and its air bearing 22 is attached to an access mechanism (actuator) 24 via an elastic support member 23, and the air is transmitted by the access mechanism 24. The bearing 22 and the electromagnetic conversion element 31 are configured to be movable in the radial direction of the magnetic disk 1.

With the structure of this embodiment as well, it is possible to suppress rotational shake in the axial direction in the area where information is recorded or reproduced by the electromagnetic conversion element 31 on the surface of the magnetic disk 1 and in the vicinity thereof. And Fig. 1
It is possible to realize stable recording / reproducing operations as in the first embodiment or the second embodiment of FIG.

In the second embodiment shown in FIG. 3 and the third embodiment shown in FIG. 4, the magnetic head 10 for recording / reproducing and the electromagnetic conversion element 31 are provided on the inner peripheral side of the magnetic disk 1 with respect to the air bearing 22. The magnetic head 10 and the electromagnetic conversion element 31 are provided on the outer peripheral side of the magnetic disk 1 with respect to the air bearing 22, and the air bearing 22 and the magnetic head 10 or the electromagnetic conversion element are described.
By configuring 31 and 31 to be movable in the radial direction of the magnetic disk 1 by the access mechanism, the same effects as those of the second embodiment of FIG. 3 and the third embodiment of FIG. 4 can be obtained, and
Since the outer peripheral surface of the magnetic disk is used as the data zone, the recording capacity of the magnetic disk can be effectively increased.

[0028]

As is apparent from the above description, according to the magnetic disk device of the present invention, the axial direction of the magnetic disk surface is reduced due to the decrease in the rigidity of the ball bearing in the spindle portion of the magnetic disk device which is small and thin. It is possible to suppress the rotational runout to the magnetic disk, stabilize the flying posture of the magnetic head that floats on the surface of the rotating magnetic disk, and realize stable recording / reproducing operations.

[Brief description of drawings]

FIG. 1 is a plan view of a main part and a side view of the main part showing a first embodiment of a magnetic disk device of the present invention.

FIG. 2 is a main part plan view showing a modified example of the first embodiment of the magnetic disk device of the present invention.

FIG. 3 is a side view of essential parts showing a second embodiment of the magnetic disk device of the present invention.

FIG. 4 is a side view of essential parts showing a third embodiment of the magnetic disk device of the present invention.

FIG. 5 is a plan view of a main part and a side sectional view of the main part for explaining a conventional magnetic disk device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic disk 9 Support spring 10 Magnetic head 21 Spindle part 22, 22a, 22b, 22c Air bearing 23 Elastic support member 24 Access mechanism 31 Electromagnetic conversion element

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Kohei 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor Shinji Koganazawa, 1015, Kamedotachu, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited

Claims (3)

[Claims] 1. A magnetic disk (1) mounted on a spindle section (21) and a magnetic head for recording / reproducing information by positioning at a predetermined position on the surface of the magnetic disk (1) by an access mechanism (24). In the magnetic disk device having (10), at least one position of the outer peripheral portion of the magnetic disk (1) is provided with an elastic bearing member (23) having an air bearing (22) having a shape sandwiching the front and back surfaces of the outer peripheral portion of the disk. A magnetic disk device, which is provided in a state of being supported by. 2. The air bearing (22) is a magnetic disk (1).
Is connected to the access mechanism (24) so as to move in the radial direction of the magnetic head, and a magnetic head (10) for recording and reproducing is arranged at each tip of the air bearing (22) via a support spring (9). The magnetic disk device according to claim 1, wherein 3. An electromagnetic conversion element (31) for recording and reproducing is provided on a surface of the air bearing (22) facing the front and back surfaces of the magnetic disk (1), and the air bearing (22) is provided with an access mechanism.
The magnetic disk drive according to claim 1, wherein the magnetic disk (1) is moved in a radial direction by (24).