JPH04149870A - Shock absorber for magnetic disk device - Google Patents

Abstract

PURPOSE:To make it possible to easily change the reading/writing range of a magnetic disk even after fixing shock absorbers by forming each cushioning material like an elliptical cylinder. CONSTITUTION:Cushioning materials 14a, 14b formed by an elastic material such as rubber like elliptical cylinders are used for shock absorbers 70a, 70b. Since the floating height of the magnetic head 3 is high when the head 3 is positioned on the outermost periphery, a coil 6 is allowed to come contact with the minor axis side of the material 14a which has weak cushioning force, so that even when the floating posture of the head 3 becomes unstable, the magnetic disk is not influenced. When the head 3 is positioned on the innermost periphery, the posture of the material 14b is set up so that the major axis side of the coil 6 having strong cushioning force comes into contact with the material 14b to prevent the floating posture from being unstabilized. Thus, the reading/writing range of the disk can be changed by changing the positions of the shock absorbers 70a, 70b.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a buffer device for a magnetic disk drive.

[Conventional technology]

As shown in FIG. 3, a conventional shock absorbing device for a magnetic disk drive has a plurality of magnetic disks 1 stacked on one spindle motor (not shown) on a base 13 and fixed with a disk clamp 2. are doing. A fixed shaft 5 is fixed to a base 13 near the magnetic disk 1, and a carriage 4 having a coil 6 fixed to one end thereof is rotatably attached.

A magnetic head 3 for writing and reading information in correspondence with the storage surface of the magnetic disk 1 is fixed to the other end of the carriage 4 . At a position corresponding to the coil 6, a yoke (not shown) made of a magnetic material and having permanent magnets (not shown) fixed to the upper and lower sides of the inner surface is installed so that the coil 6 rotates around the fixed shaft 5. It is fixed to the base 13 as possible.

The magnetic head 3 is placed on a designated track of the magnetic disk 1.
To position the coil 6, control the current flowing through the coil 6,
The carriage 4 is rotated.

At this time, a buffer device 70c is provided for the innermost circumference and a buffer device 70d is provided for the outermost circumference to prevent the magnetic head 3 from coming off the recording surface of the magnetic disk 1 due to runaway of the circuit system or the like. During runaway, the coil 6 comes into contact with the buffer devices 70c and 70d to prevent the magnetic head 3 from coming off the recording surface of the magnetic disk 1.

As shown in FIG. 4, the shock absorbers 70c and 70d have a shock absorbing material 14c made of a resilient material such as cylindrical rubber, and an unthreaded portion 8a in which a thread is not cut. Screw 8 that penetrates and fixes to base 13, and bases 13 and 11 to prevent screw 8 from loosening! ! A disc spring 11 is provided between the shock absorber 14c and penetrated by the screw 8 together with the shock absorber 14C, and a disc spring 11 is provided between the shock absorber 14c and the shock absorber 14C to protect the shock absorber 14c. 11 and a washer 10 that is penetrated by the screw 8.

[Problems to be Solved by the Invention] In the shock absorbing device of the conventional magnetic disk device described above, the cylindrical shock absorbing material 14c is fixed with screws 8, so after fixing, the position of the shock absorbing device is changed and the magnetic disk is removed. There is a problem that the range of reading and writing cannot be changed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a buffer device for a magnetic disk device that allows changing the read/write range of a magnetic disk even after the buffer device is fixed.

[Means to solve the problem]

A shock absorber for a magnetic disk drive of the present invention includes a base to which a fixed shaft is fixed, a magnetic head corresponding to a magnetic disk is attached to one end, a coil is fixed to the other end, and the base is rotatably attached to the fixed shaft. a carriage; a first 1111 material attached to the base so as to be in contact with the coil when the magnetic head is located at the outermost periphery of the magnetic disk; In the shock absorbing device for a magnetic disk drive, the first and second shock absorbers have an elliptical columnar shape and are rotatably attached. It is characterized by the presence of

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a top view of one embodiment of the present invention. In this embodiment, the conventional shock absorbers 70c and 70d are replaced with shock absorbing bags [70a,
It has a configuration in which it was replaced with 70b.

FIG. 2 is an exploded view of the shock absorbers 70a and 70b, in which the conventional shock absorber 14c is replaced with shock absorbers 14a and 14b made of an elastic material such as elliptical columnar rubber.

Note that when the magnetic head 3 is located at the outermost circumference (solid line part), the flying height of the magnetic head 3 is large, so the coil 6
makes contact with the short axis side of the buffer material 14a where the buffering force is weak, and even if the flying posture becomes unstable, it will not affect the magnetic disk.
However, when the magnetic head 3 is located at the innermost circumference (dotted line), the flying height of the magnetic head 3 is small, so the coil 6 is placed on the buffer material 14.
In order to prevent the floating posture from becoming unstable even if it comes into contact with Mf, the long-sleeved side of the cushioning material 14b has a strong buffering force.
The attitude of the ll material 14b is set.

〔Effect of the invention〕

As explained above, the present invention has the advantage that by making the cushioning material into an elliptical cylinder shape, the read/write range of the magnetic disk can be changed even after the cushioning device is fixed.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is an I! FIG. 3 is a plan view of a conventional shock absorber, and FIG. 4 is an exploded view of a conventional shock absorber. 3...Magnetic head, 6...Coil, 1
4a. 14 b -------Buffer material, -/Oa, 70
b ----=M*device. Agent Patent Attorney Shinsho Uchihara?夷

Claims (1)

[Claims] a base to which a fixed shaft is fixed; a carriage to which a magnetic head corresponding to the magnetic disk is attached at one end and a coil fixed to the other end so as to be rotatable about the fixed shaft; a first buffer material attached to the base so as to be in contact with the coil when the magnetic head is located on the outermost periphery of the magnetic disk; and a second buffer material for a magnetic disk drive, wherein the first and second buffer materials have an elliptical columnar shape and are rotatably attached. Device.