JPH04195958A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To realize reduction of the number of parts simplification of manufacturing process and reduction of manufacturing cost by fixing a magnetic disk with a disk press plate comprising an elastic material having plural lugs which can be engaged with a groove provided in the circumference direction around the hub of a spindle motor on which the magnetic disk is mounted. CONSTITUTION:A magnetic disk 12 is fixed on a spindle motor 13 with a disk press member 21. The disk press member 21 has plural lugs 22 monolithically molded or plastically worked to specified bending degree into a L-shape form. A groove is provided in the circumference direction around the motor hub 23 where the lugs 22 of the magnetic disk 12 are engaged. When the magnetic disk 12 is to be fixed, the magnetic disk 12 is mounted on the spindle motor 13 and the disk press member 21 is applied and pressed so that the top ends 22a of lugs enter the groove 24. By this method, the top end part 22a is pressed by the body part 22b of the lug to fix the magnetic disk 12. Thus, reduction of parts number, simplification of manufacturing process and reduction of manufacturing cost can be realized.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a magnetic disk device.

(Prior Art) A conventional magnetic disk device generally has a structure as shown in FIGS. 4 and 5. FIG. 4 is a perspective view of the inside of the magnetic disk device, and FIG. 5 is a sectional view of the magnetic disk device 11 taken along line A--A in FIG. 4. The magnetic disk 12 is placed on a spindle motor 13 and rotated at high speed, and a magnetic head 14 records and reproduces information. In order to fix this magnetic disk 12 on the spindle motor 13, the magnetic disk 12 supported on the motor hub 13 is held down by a disk holding plate 15, and this holding plate 15 is fastened with several screws 16. . In such a magnetic disk device, it is necessary to form tapped holes 17 and 17 in the motor hub 23 and the disk holding plate 15, respectively. Therefore, when considering the manufacturing process of a magnetic disk device, in addition to the turning process, it is necessary to perform pilot hole drilling, tapping, and after placing the disk holding plate 15, a process of tightening a plurality of screws 18 is required. As a result, the manufacturing cost of the spindle motor becomes high.

(Problems to be Solved by the Invention) As detailed above, in conventional magnetic disk drives, the disk holding plate is fixed with screws, which requires a large number of parts and the manufacturing process is complicated, resulting in manufacturing costs. The problem was that it was expensive.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a magnetic disk device with a simpler manufacturing process and lower manufacturing cost by improving the method of fixing a magnetic disk.

[Structure of the Invention] (Means for Solving the Problems) In the magnetic disk drive of the present invention, a groove is provided in the circumferential direction of the outer periphery of the hub portion of the spindle motor in which the magnetic disk is installed, and a The magnetic disk is fixed by a disk holding plate made of an elastic material and having a plurality of claws.

(Function) The magnetic disk device of the present invention requires fewer parts than conventional magnetic disk devices. Further, when assembling the device, it is sufficient to simply install a disk presser plate made of an elastic material so that the claw portion thereof engages with the groove provided in the hub of the spindle motor. Therefore, since the manufacturing steps are fewer and simpler than in conventional magnetic disk devices, it is possible to manufacture a magnetic disk device with lower manufacturing costs.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 to 3. FIG. 1 is a perspective view of the inside of the magnetic disk device used in this embodiment, and FIG. 2 is a sectional view of the magnetic disk device taken along line BB in FIG. Furthermore, FIG. 3 shows a partially enlarged sectional view of FIG. 2.

The magnetic disk 12 is placed on a spindle motor 13 and rotated at high speed, and a magnetic head 14 records and reproduces information. This magnetic disk 12 is attached to the disk presser 2
1 on the spindle motor 13. The disc presser 21 is made of an elastic material such as plastic, and has a plurality of claws 22 integrally molded or plastically worked. This claw 22 is bent into an L-shape by a predetermined amount and consists of a tip 22a and an abdomen 22b. Furthermore, grooves are cut in the circumferential direction on the outer periphery of the motor hub 23 at a portion where the claws of the magnetic disk 12 are engaged.

When fixing the magnetic disk 12, the magnetic disk 12 is placed on the spindle motor 13, the disk presser 21 is placed on top of the magnetic disk 12, and the disk is pressed so that the tips 22a of the claws enter the grooves 24. This allows the tip 22a to
The magnetic disk 12 is fixed by receiving pressure from the magnetic disk 22b.

In this way, according to the magnetic disk device of this embodiment, parts such as screws can be reduced compared to conventional magnetic disk devices. In addition, manufacturing steps such as pilot hole processing, tapping processing, and screwing steps can be reduced, so manufacturing costs can be kept low.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to provide a magnetic disk device with a small number of parts and low manufacturing costs.

[Brief explanation of the drawing]

1 to 3 relate to a magnetic disk device according to an embodiment of the present invention, in which FIG. 1 is a perspective view of the inside of the magnetic disk device, FIG. 2 is a sectional view of the magnetic disk device, and FIG. 3 is a sectional view of the magnetic disk device. FIG. 3 is a partially enlarged sectional view of FIG. 2; Furthermore, FIGS. 4 and 5 relate to conventional magnetic disk devices,
FIG. 4 is a perspective view of the inside of the device, and FIG. 5 is a sectional view. 12...Magnetic disk 13...Spindle motor 14...Magnetic head 21...Disc presser 22a...Disc presser claw tip 22b...・
... Disc presser claw abdomen 24 ... Groove

Claims (1)

[Claims] A spindle motor having a groove in the circumferential direction on the outer periphery of a hub part to support a magnetic disk, and a plurality of claws made of an elastic material and provided to engage with the grooves in the hub part of the spindle motor, and the magnetic disk. A magnetic disk device comprising a disk holder for fixing a disk to the spindle motor.