JP2539485Y2 - Disk drive - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive, and more particularly, to a structure for attaching a chucking magnet to a hub base.

[0002]

2. Description of the Related Art FIG . 2 shows an example of a conventional disk drive. In FIG. 2 , information is displayed on the rotation drive shaft 23 of the motor .
A hub 21 on which a disk serving as a recording medium is mounted is fixed. The hub base 21 is formed in a dish shape with a material such as brass or aluminum, and an upper portion of an outer peripheral portion protrudes in a cylindrical shape. The yoke plate 26 made of an iron-based magnetic material is adhered and fixed to a flat portion at the bottom between the outer protruding edge portion of the hub base 21 and the central rotation drive shaft. Since the upper surface of the yoke plate 26 is chucking magnet 22 for attracting the disc rotating member is bonded and fixed, Ji catcher Tsu King magnet 22 is smaller adhesive surface than the yoke plate 26, outside of the hub seat 21 dead space 24 is formed between the outer peripheral surface of the protruding edge in the peripheral surface and the chucking magnet 22.

[0003]

When the yoke plate 26 is bonded and fixed on the hub base 21 and the chucking magnet 22 is bonded and fixed on the yoke plate 26 as in the above-described conventional example, the bonding positions are two places. Therefore, it takes time to assemble. In addition, when the adhesive strength varies or becomes insufficient, the chucking magnet 22 or the yoke plate 26 is not mechanically fixed, so that there is a possibility that the chucking magnet 22 or the yoke plate 26 may be peeled off when the disc is attached or detached.

The present invention has been made in order to solve such a problem, and it is possible to firmly fix a yoke plate and a chucking magnet on a hub base and to simplify a fixing operation. And , if necessary,
Flip and an object thereof is to provide a disk drive apparatus that can be exchanged chucking magnet to. The present invention
Also, it is generated from the chucking magnet toward the outer circumference.
Leakage magnetic flux by the chucking magnet fixing mechanism
Provide a disk drive that can be shielded
The purpose is to:

[0005]

[Summary of the invention of claim 1 wherein the the hub seat disc rotating body is secured to the rotary drive shaft is mounted, placing the yoke plate obtained by polymerizing magnet, the magnet Place magnet holder around
Then, the magnet is integrated with the hub base and fixed by screwing means via the magnet holder . In the invention according to claim 2, the magnet holder is made of a magnetic material.
It is characterized by consisting of .

[0006]

According to the first aspect of the invention, when the screwing means is screwed into the hub base and the magnet holder is fixed to the hub base, the magnet is pressed by the magnet holder and fixed to the hub base. When the disk rotator is placed on the hub base, the magnet attracts the disk rotator to bring the disk rotator into close contact with the hub base. In the invention according to claim 2, the magnet
From the magnetic material
Shielded by a magnet holder.

[0007]

Hereinafter, embodiments of the disk drive device according to the present invention will be described with reference to the drawings. In FIG. 1, a hub 1 on which a disk rotating body is mounted is fixed to a rotary drive shaft 4 of the motor. The hub 1 is formed of a material such as brass or aluminum, and has an outer edge protruding upward in a cylindrical shape . Portion between the rotary shaft 4 and the outer protruding edge of the hub base 1 is recessed, Tei Ru yoke plate 6 of ferrous is spread on the flat part of the bottom of the recess.

A chucking magnet 5 is provided on the yoke plate 6 at a position near the rotary drive shaft 4. The outer peripheral surface of the chucking magnet 5 and the protruding edge of the hub 1
A magnet holder 3 using a magnetic material (yoke material) such as iron is provided in a portion which was conventionally a dead space between the inner peripheral surface of the portion and the inner peripheral surface . The magnet retainer 3 has a mounting hole, and a screw 2 penetrating the mounting hole and the mounting hole of the yoke plate 6 is screwed into the hub 1 so that the magnet retainer 3 and the yoke plate 6 are fixed to the hub 1. I have.

The magnet holder 3 has a flange at the upper part on the inner peripheral side, the chucking magnet 5 has a flange at the lower part on the outer peripheral side, and the flange of the magnet holder 3 presses the flange of the magnet 5 from above.
The chucking magnet 5 is fixed to the hub 1. Therefore, the magnet 5 can be fixed without using an adhesive. If a gap is formed between the chucking magnet 5 and the magnet holder 3, the gap can be filled by injecting an adhesive.

A disk rotating body 8 such as a magneto-optical disk is mounted on the upper surface of the hub 1. A clamper 9 made of a magnetic material is attached to the disk rotator 8 so as to surround the center of rotation. When the disk rotator 8 is placed on the hub 1, the clamper 9 is attracted by the chucking magnet 5 and the disk rotator is rotated. The body 8 is positioned and clamped on the protruding edge of the hub 1.

[0011] hub seat 1 and the rotary drive shaft 4 integral is rotated by a motor built into the lower hub base 1.

According to the embodiment, since the chucking magnet 5 is mechanically fixed using the screw 2 under the intervention of the magnet holder 3 , the chucking magnet 5 can be prevented from peeling off and assembled. The bonding step at the time can be omitted, and the chucking magnet 5 can be replaced as needed. In addition, the screw
2 clamping force is indirectly via the magnet holder 3
Since it is applied to the chucking magnet 5, the tightening force is
Focusing on the chucking magnet 5 locally
The screw 5 and the magnet
5 does not rub against each other to generate wear powder.
Causes wear and tear on disc playback / recording
It will not be.

Further, by disposing the magnet holder 3 and the chucking magnet 5 in the concave portion of the hub base 1, the protruding edge portion of the hub base 1 which was conventionally dead space is provided.
Between the inner peripheral surface of the magnet and the outer peripheral surface of the chucking magnet 5
Since there is no space, the stability of the motor is improved by the increase of the inertia force, which leads to the improvement of the rotation unevenness. Furthermore, Magne
A magnetic material such as iron is used as the material of the holder 3.
Therefore, magnetic flux leaking to the outer peripheral side of the chucking magnet 5
Goes to magnet holder 3, and magnet holder 3
Brings a shielding effect.

Although the illustrated embodiments are all configured for a magneto-optical disk, the present invention is not limited to a magneto-optical disk and can be applied to any other disk devices. Chucking Magne
The material and molding method of the kit are optional.
A molded magnet such as a stick magnet may be used.
No.

[0015]

[Effect of the invention] According to the invention of claim 1, wherein, for the mechanically fixed using screws to the hub seat chucking magnet under the intervention of the magnet retainer, it is possible to prevent the peeling of the chucking magnet In addition, the bonding step at the time of assembly can be omitted, and the chucking magnet can be replaced as needed. Ma
Also, the tightening force of the screw is indirect via the magnet holder.
Clamping force because it is applied to the chucking magnet
Is locally concentrated on the chucking magnet
The screws and magnets are not damaged
Do not rub against each other to generate wear powder, and
Detrimental effects on disk playback / recording due to wear powder
Is also gone.

According to the second aspect of the present invention, a magnet is provided.
Since a magnetic material such as iron is used as the material of the holding,
Magnetic flux leaking to the outer periphery of the chucking magnet
For magnet holder, magnet holder has shielding effect
Bring.

[Brief description of the drawings]

FIG. 1 is a sectional front view showing an embodiment of a disk drive device according to the present invention.

FIG. 2 is a sectional front view showing an example of a conventional disk drive.
It is.

[Description of Signs] 1 hub 2 screwing means 3 magnet holder 4 rotation drive shaft 5 chucking magnet 6 yoke plate 8 disk rotating body

Claims (2)

(57) [Scope of request for utility model registration] 1. A yoke plate on which a magnet is superimposed is mounted on a hub base fixed to a rotary drive shaft and on which a disk rotating body is mounted, and the magnet is used to suck the disk rotating body toward the hub base. in disk drive operated device which is adapted, mug to press the magnet on the outer periphery of the magnet
A disk drive device comprising: a net holder; and the magnet fixed to the hub by screwing means via the magnet holder . 2. The magnet holder is made of a magnetic material.
2. The disk drive according to claim 1, wherein: