JP2001148187A - Disk clamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk clamp which can secure the even clamp load in the circumferential direction with rotation-stopping pin holes maintained as they are. SOLUTION: The fringe part of the rotation-stopping pin holes is bent, so as to secure even clamp load in the circumferential direction of a disk clamp having the rotation stopping pin holes. Furthermore, the thickness of the disk clamp is varied in the circumferential direction of the clamp, so as to secure even clamp load in the circumferential direction of the disk clamp having the rotation-stopping pin holes. For example, the thickness of a position in the circumferential direction and having the holes is increased compared with the thickness of a position in the circumferential direction and having no holes. Thus, almost the same clamp load is secured between both positions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in a disk clamp used in a magnetic disk drive.

[0002]

2. Description of the Related Art FIG. 6 is a diagram showing the overall configuration of a magnetic disk drive. FIG. 6 illustrates a state in which the actuator arm 6 having a head for reading and writing to the magnetic disk 3 attached to the tip thereof is moving.

FIG. 7 is a view showing a conventional disk clamp. FIG. 7A is an overall top view thereof, and FIG.
FIG. 2 is a partial cross-sectional view of the magnetic disk device around a disk clamp. In FIG. 7B, the DC motor 5 is mounted on the base 10. At least one magnetic disk 3 is attached to the DC motor 5 so as to be rotatable around the DC motor 5. FIG. 7B shows two magnetic disks 3 with a spacer 4 interposed therebetween, as an example. And FIG.
As shown in (b), by fastening the disk clamp 1 and the DC motor 5 with the clamp screw 2, the magnetic disk 3 is pressed by the bent peripheral portion of the disk clamp 1, and Fixed.

The disk clamp 1 has a disk shape as shown in FIG. 7A, and has a hole 1a for a clamp screw 2 at the center. When the disk clamp 1 and the DC motor 5 are fastened (or disassembled in the repair process) in the assembly process using the clamp screw 2, it is necessary to prevent the DC motor 5 from rotating. Therefore, the disc clamp 1
A plurality of holes 1b other than the center hole 1a are provided, and FIG.
As shown in (1), the rotation stop pin 7 is inserted into the hole 1b. The rotation of the DC motor 5 is suppressed by the engagement of the pin 7 with the DC motor 5.

[0005]

However, if the disc clamp 1 is provided with the rotation stop pin hole 1b, the clamp load at the position where the hole 1b exists in the circumferential direction becomes larger than the clamp load at the position where the hole 1b does not exist. It becomes weaker. That is, the clamp load for pressing the magnetic disk 3 becomes uneven in the circumferential direction.

FIG. 8 is a diagram schematically showing a change in clamp load in the circumferential direction. In FIG. 8, for example, four rotation stop pin holes 1b are
When it exists at the position of 90 degrees, 180 degrees, and 270 degrees, the clamp load at and near the circumferential position where the hole 1b exists is lower than that at other positions.

If the clamp load is not uniform, the magnetic disk 3 may be undulated (distorted). In such a case, the positional relationship between the head and the magnetic disk 3 becomes uneven, so that the levels of the read signal and the write signal in the head become unstable. As described above, when the clamp load becomes non-uniform, the accuracy of the position of the magnetic disk 3 decreases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk clamp in which a clamp load in the circumferential direction is uniform while having a hole for a detent pin.

[0009]

In order to achieve the above object, the present invention provides a disk clamp having a hole for a detent pin so that the clamping load in the circumferential direction of the disc clamp is uniform. The periphery is bent. Thereby, the peripheral edge of the hole is reinforced, so that the clamp load at the circumferential position where the hole exists can be made substantially equal to the clamp load at the circumferential position where the hole does not exist.

Further, in the present invention, the thickness of the disk clamp in the circumferential direction is changed so that the clamp load in the circumferential direction of the disk clamp having the anti-rotation pin hole becomes uniform. For example, by making the thickness at the circumferential position where the hole exists thicker than the thickness at the circumferential position where the hole exists, the clamp load at the circumferential position where the hole exists can be reduced in the circumferential direction where the hole does not exist. It can be made approximately equal to the clamp load at the position.

[0011]

Embodiments of the present invention will be described below. However, the technical scope of the present invention is not limited to the present embodiment.

FIG. 1 is a diagram showing a disk clamp according to a first embodiment of the present invention. FIG. 1A is a top view thereof, and FIG. 1B is a cross-sectional view taken along line AA ′ of FIG. 1A. In FIG. 1A, a disk clamp 1 is
It is a disc-shaped member, and has a hole 1a for a clamp screw at a center portion thereof and, for example, four holes 1b for rotation stop pins other than the center portion. In the disk clamp according to the first embodiment, as shown in FIG. 1 (b), the periphery of the detent pin 1b is bent in the direction in which the clamp load is applied (the axial direction of the hole 1b). FIG. 2 is an enlarged view of a portion indicated by a dotted line in FIG.

By bending the periphery of the hole 1b, the periphery of the hole 1b is reinforced, and the clamping load is increased. This can be generally understood by the following example.

FIG. 3 is a diagram for explaining a case where the clamping load is increased by bending. When a load is applied to the flexible flat plate 100 shown in FIG. 3A from above, for example, as shown by an arrow in the drawing, the flat plate 100 bends. Next, as shown in FIG.
Is bent in a direction in which a load is applied.
Then, similarly to FIG. 3A, it is known that the flat plate 100 is hardly bent even when a load is applied from above.

The clamp load to be increased depends on the bending angle, and the clamp load is most increased at 90 degrees. Preferably, the bending angle is adjusted and set so that the clamp load of the disc clamp is uniform in the circumferential direction.

The bending direction is the direction in which the clamp load is applied (downward of the axis in FIG. 2B).
Or in the opposite direction (on the axis in FIG. 2B).

As described above, in the first embodiment, the clamping load at the circumferential position where the hole 1b exists is increased by bending the peripheral portion of the hole 1b for the rotation stop pin of the disk clamp. . Thereby, the clamp load of the disc clamp can be made uniform in the circumferential direction.

FIG. 4 is a view showing a disk clamp according to a second embodiment of the present invention. FIG. 4A is a top view thereof, and FIG. 4B is a cross-sectional view taken along line AA ′ of FIG. 4A. In FIG. 4A, the disc clamp 1 is
Similar to FIG. 1, it has a disk shape, and has a hole 1a for a clamp screw at a central portion and, for example, four holes 1b for rotation stop pins other than the central portion. In the disk clamp according to the second embodiment, as shown in FIG. 4B, the thickness of the circumferential position where the hole 1b exists and the thickness of the surrounding position are different from the thickness of the other circumferential positions. be changed. By changing the thickness, the strength of the disk clamp changes, so that the clamp load applied to the disk clamp can be adjusted. Specifically, the thickness at or near the circumferential position where the hole 1b exists is larger than the thickness at the circumferential position where the hole 1b does not exist because the clamp load is low.

FIG. 5 is an enlarged view of a portion indicated by a dotted line in FIG. As shown in FIG. 5, a predetermined width and a predetermined thickness are added in a radial direction from the hole 1a at the center to the hole 1b for the detent pin. Thickness is added.

The shape of the portion to be thickened is not limited to the shape shown in FIG. 4, but is arbitrarily set so that the clamp load becomes uniform. The thickness of the thickened portion is also set so that the clamp load becomes uniform.

As described above, in the second embodiment, the thickness of the hole 1b in the circumferential direction where the hole 1b for the detent pin exists or in the vicinity thereof is made thicker than the other thickness. The clamping load at or near the existing circumferential position is enhanced. Thereby, the clamp load of the disc clamp can be made uniform in the circumferential direction.

The scope of protection of the present invention is not limited to the above embodiments, but extends to the inventions described in the claims and their equivalents.

[0023]

As described above, according to the present invention, the clamp load in the circumferential direction of the disc clamp having the hole for the detent pin can be made uniform. Therefore, the quality of the position of the magnetic disk is further improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a disk clamp according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a portion indicated by a dotted line in FIG.

FIG. 3 is a diagram illustrating a case where a clamping load is increased by bending.

FIG. 4 is a diagram showing a disk clamp according to a second embodiment of the present invention.

FIG. 5 is an enlarged view of a dotted line part in FIG. 4 (b).

FIG. 6 is an overall configuration diagram of a magnetic disk drive.

FIG. 7 is a view showing a conventional disk clamp.

FIG. 8 is a diagram schematically showing a change in a clamp load in a circumferential direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disk clamp 2 Clamp screw 3 Magnetic disk 4 Spacer 5 DC motor 6 Actuator arm 7 Detent pin

Claims (2)

[Claims] 1. A disk clamp for fixing a magnetic disk mounted on a magnetic disk device to a motor for rotating the magnetic disk, wherein the disk clamp has a disk-like shape having at least one hole other than a central portion. A disk clamp characterized in that a peripheral portion of the hole is bent. 2. A disk clamp for fixing a magnetic disk mounted on a magnetic disk device to a motor for rotating the magnetic disk, wherein the disk clamp has a disk-like shape having at least one hole other than a center portion. A disk clamp having a thickness that varies along a circumferential direction.