JP2000011560A - Magnetic head actuator stopper of magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance shock absorbing performance without needing a large space to be installed regarding a magnetic head actuator stopper of a magnetic disk device. SOLUTION: This magnetic head actuator stopper of a magnetic disk device is the one for holding a magnetic head slider in a tip and regulating the rotational stroke of a magnetic head actuator 3 for allowing the magnetic head slider to seek a specified position on the upper surface of the magnetic disk. In this case, in the shock contact part with the magnetic head actuator 3, a bumper part 6 made of an elastic material and having a hollow part 5 communicated with external air through a small air releasing hole 4 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopper for a magnetic head actuator of a magnetic disk drive.

[0002]

2. Description of the Related Art In general, as shown in FIG. 1, a magnetic disk drive comprises a plurality of magnetic disks 2, 2... And a magnetic circuit 9. When the magnetic circuit 9 is excited, the magnetic head actuator 3 is driven to rotate around the rotation axis 30, and the magnetic head slider 1 can seek to a predetermined position on the magnetic disk 2. The rotation stroke of the magnetic head actuator 3 is regulated by the stopper A. When the magnetic head actuator 3 attempts to rotate beyond a predetermined stroke, the magnetic head slider 1 comes into contact with the stopper A and jumps out of the upper surface of the magnetic disk 2. To prevent that.

Conventionally, as shown in FIG. 4, the stopper A is formed by mounting a bumper member 10 made of an elastic material such as rubber or a synthetic resin material on a stopper column 7, but these are solid. Due to the cross section, there are the following disadvantages. That is, the shock absorbing force of the magnetic head actuator 3 at the time of contact is immediately determined by the elastic properties of the material itself and the deformation size due to the impact. When a hard material is used, as shown in FIG. 4B, the impact force applied to the magnetic head actuator 3 cannot be reduced, and as shown in FIG. 4B, the amount of rebound after the contact increases, and the number of impact loads applied to the magnetic head actuator 3 also increases. To increase. It is effective to use a soft material in order to enhance the shock absorbing capacity. However, in this case, a large space is required because the bending of the bumper member 10 increases.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a stopper for a magnetic head actuator of a magnetic disk drive capable of increasing the shock absorbing capacity without requiring a large space. Aim. It is another object of the present invention to provide a magnetic disk drive having improved operation reliability by using such a stopper.

[0005]

According to the present invention, the above-mentioned object is achieved by holding a magnetic head slider 1 at a leading end and attaching the magnetic head slider 1 to a magnetic disk 2 as illustrated in FIG.
A stopper for a magnetic head actuator of a magnetic disk drive for restricting a rotation stroke of the magnetic head actuator 3 which seeks to a predetermined position on the upper surface, wherein a contact portion with the magnetic head actuator 3 is formed of an elastic material and has a small hole. This is achieved by providing a stopper for a magnetic head actuator of a magnetic disk drive provided with a bumper section 6 having a hollow section 5 communicating with the outside air via an air release hole 4.

The magnetic head actuator 3 has a stopper A
, The air in the bumper section 6 is compressed and flows out of the air release hole 4 to reduce the volume. The volume of the bumper section 6 containing the air layer is reduced due to the compression and outflow of the air, thereby absorbing the impact force.
Suppress bouncing. The material of the bumper section 6 can be appropriately selected, but it is desirable that the bumper section 6 has such an elasticity that it returns to its original shape by elasticity after the air escapes from the air escape hole 4.
The volume of the hollow portion 5 and the size of the air release hole 4 are appropriately determined in consideration of the magnitude of the shock to be attenuated and the amount of bending used for the attenuation.

According to the second aspect of the present invention, the hollow portion 5 of the bumper portion 6 is sealed, and a fluid is sealed therein.
As the fluid, air, water, or a liquid having an appropriate viscosity can be used. In the present invention, the impact force is the movement of the fluid,
Alternatively, the magnetic head actuator 3 is attenuated by the compression and the elastic deformation of the outer periphery of the bumper section 6, so that the load of the impact force on the magnetic head actuator 3 is reduced, and the amount of rebound after the collision with the bumper section 6 is also reduced. The material of the shell forming member of the bumper portion 6, the volume of the hollow portion 5, the viscosity of the fluid sealed in the hollow portion 5, or the internal pressure is appropriately determined in consideration of the magnitude of the shock to be attenuated and the amount of bending used for the attenuation. It is determined.

The invention according to claim 3 is the invention according to claim 1 or 2
This is a magnetic disk drive in which the bumper portion described above is mounted on a stopper support column 7, and the impact force on the magnetic head actuator 3 is reduced, so that the product life is extended and the read / write reliability is extended over a long period. Can be maintained. The bumper portion 6 can be formed in an appropriate shape. However, as in the invention according to the fourth aspect, the mounting workability is improved by forming the ring shape and winding the stopper support 7. Thus, the manufacturing workability is improved.

[0009]

FIG. 1 shows a magnetic disk drive according to the present invention. The overall configuration of the magnetic disk drive except for the stopper A is the same as that described in the related art.
A magnetic disk 2 that is driven to rotate by a motor 8 fixed to the housing 11, and a rotating shaft 3 that stands upright from the housing 11
A magnetic head actuator 3 rotatable around zero. A plurality of magnetic disks 2 are stacked at a predetermined interval from each other with a spacer 2a interposed therebetween, and the magnetic head actuator 3 is configured by fixing a suspension arm 3b to the end of an arm portion of an actuator block 3a. A magnetic head slider 1 is fixed to the tip of the suspension arm 3b, and each magnetic head slider 1 is held at an appropriate height on the front and back surfaces of the magnetic disk 2. The magnetic head actuator 3 is driven by exciting a coil 12 fixed to the actuator block 3a, and a magnetic circuit 9 is disposed on the housing 11 side to face the coil 12.

In order to regulate the rotation stroke of the magnetic head actuator 3, a stopper A is disposed on the housing 11 side so as to sandwich the coil holding piece 3c of the actuator block 3a. The stopper A is, as shown in FIG.
The magnetic circuit 9 is formed with a bumper 6 around the periphery of a stopper column 7 which also serves as a spacer for holding the upper yoke 9a and the lower yoke 9b. The bumper portion 6 is a thin-walled hollow ring body in which one or a plurality of small-diameter air release holes 4 are perforated on the outer peripheral portion, and is wound around the stopper support column 7 and mounted. A mounting groove 7 a for holding the bumper portion 6 is formed on the outer periphery of the stopper column 7. The material of the bumper 6 is formed of a soft and elastic material, and for example, nitrile rubber, chloroprene rubber, butyl rubber, fluorine rubber, or the like can be used.

Therefore, in this embodiment, when the magnetic head actuator 3 comes into contact with the bumper portion 6 of the stopper A, the air in the hollow portion 5 flows out of the air release hole 4 to the outside air, and the contact portion is deflated and the impact force is reduced. After the magnetic head actuator 3 is stopped, the external restoring force of the bumper 6 sucks the outside air through the air release hole 4 to return to the original shape. By setting the volume of the hollow portion 5, the elasticity of the material of the outer periphery of the bumper portion 6, and the air release hole 4 to appropriate values, the magnetic head actuator 3 can move the surface position of the bumper portion 6 as shown in FIG. It stops at a position that is sunk by δ from, and does not bounce. In addition, by suitably selecting the above-described various factors, it is possible to increase R in the relationship between the time until the stop and the displacement in FIG. 2B, and accordingly, the impact force F (see FIG. c)) can also be reduced.

In FIG. 2, the bumper portion 6 is formed in a hollow ring shape so that it can be wound around and attached to the stopper column 7. For example, the bumper portion 6 is formed in a hollow rod shape so that the stopper column 7 can be penetrated. Alternatively, it can be fitted in the shape of a horseshoe, or even in the form of a block, and can be fitted to or bonded to the column 7 for stopper.

FIG. 3 shows a second embodiment of the present invention.
In the description of the present embodiment, since other components are the same as those of the above-described embodiment, only the changed portions will be described. In this embodiment, the bumper section 6 is formed in a closed hollow ring shape, and the hollow section 5 is filled with an appropriate fluid. As the fluid, air, water, or a highly viscous fluid such as oil or grease can be used.

Therefore, in this embodiment, the impact of the magnetic head actuator 3 is absorbed and attenuated by the movement of the fluid in the hollow portion 5. At this time, in order to prevent the magnetic head actuator 3 from bouncing at the time of abutment, it is desirable to fill the fluid to such an extent that the outer shell of the bumper section 6 is slightly withdrawn, as shown in FIG. .

The bumper section 6 can be formed of the same material as that of the above-described embodiment. However, when a highly viscous fluid is sealed in the hollow section 5, the fluid returns to its original position. Can restore the deformation due to impact,
Soft synthetic resin materials such as polyethylene, vinyl chloride resin, and polyvinyl chloride can be used.

[0016]

As is apparent from the above description, according to the present invention, the shock absorbing capacity can be increased without requiring a large space.

[Brief description of the drawings]

FIG. 1 is a diagram showing the present invention.

FIGS. 2A and 2B are diagrams showing main parts of FIG. 1, wherein FIG.
(B) is a time-displacement diagram of the magnetic head actuator,
(C) is a time-impact force diagram for the magnetic head actuator.

FIGS. 3A and 3B are diagrams showing a second embodiment of the present invention, wherein FIG.
Is a cross-sectional view of the stopper, and (b) is a plan view of the bumper portion.

4 (a) is a sectional view, FIG. 4 (b) is a time-displacement diagram of the magnetic head actuator, and FIG. 4 (c) is a time-impact force diagram for the magnetic head actuator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic head slider 2 Magnetic disk 3 Magnetic head actuator 4 Air escape hole 5 Hollow part 6 Bumper part 7 Prop for stopper

Claims (4)

[Claims] A stopper for a magnetic head actuator of a magnetic disk drive for holding a magnetic head slider at a tip and for restricting a rotation stroke of a magnetic head actuator for seeking the magnetic head slider to a predetermined position on a top surface of a magnetic disk; A stopper for a magnetic disk actuator of a magnetic disk drive, wherein a bumper portion provided with a hollow portion formed of an elastic material at an abutting portion with the magnetic head actuator and communicating with the outside air through a small air release hole is provided. 2. A stopper for a magnetic head actuator of a magnetic disk drive, which holds a magnetic head slider at a leading end and regulates a rotation stroke of a magnetic head actuator for seeking the magnetic head slider to a predetermined position on an upper surface of a magnetic disk. A magnetic head actuator stopper for a magnetic disk drive, wherein a bumper portion having a hollow portion formed of an elastic material and filled with a fluid is provided at a contact portion with the magnetic head actuator. 3. A magnetic disk drive in which the bumper according to claim 1 is mounted on a pillar for stopper. 4. The magnetic disk drive according to claim 3, wherein said bumper portion is wound around a stopper column and mounted.