JP2540274Y2 - Disc chucking mechanism - 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 chucking mechanism in a disk drive for rotating a disk such as an optical disk or a magnetic disk, and more particularly to a structure for fixing a chucking magnet to a hub base.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, in a disk chucking mechanism of this type, a hub base 21 on which a disk device is mounted is fixed to a rotary drive shaft 23 of a motor (not shown). 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 outer edge of the hub 21 and the central rotary drive shaft 23 are recessed, and a yoke plate 26 made of an iron-based magnetic material is mounted and fixed to a flat bottom portion. A chucking magnet 22 for adsorbing the disk rotating body is bonded and fixed to the upper surface of the yoke plate 26. In this case, the chucking magnet 22 has a smaller bonding area than the yoke plate 26, and therefore has an outer protruding edge. A dead space 24 is generated between the chucking magnet 22 and the chucking magnet 22.

[0003]

In the conventional disk chucking mechanism, 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, Assembly work is troublesome because there are two bonding locations. Further, when the bonding strength varies or becomes insufficient, the chucking magnet 22 or the yoke plate 26 is not mechanically fixed.
There was a possibility that the disk would come off when the disk was 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. It is an object of the present invention to provide a disk chucking mechanism capable of performing the above-described operations.

[0005]

According to the present invention, a chucking magnet is superimposed and mounted via a yoke plate on a hub table fixed to a rotary drive shaft and on which a disk rotating body is mounted.
The chucking magnet is fixed to the hub base by a magnet pressing member via an elastic material.

[0006]

When the yoke plate and the chucking magnet superimposed on the hub base are fixed by a magnet holder via an elastic material, the chucking magnet is elastically pressed by the elastic material and securely fixed to the hub base. When the disk rotator is placed on the hub, the chucking magnet attracts the disk rotator to bring the disk rotator into close contact with the hub.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disk chucking mechanism according to the present invention will be described below with reference to the drawings. In FIG. 1, a hub 1 is formed of a material such as brass or aluminum into a substantially dish-like circular shape, and a rib portion 1a is formed at the center thereof so as to project therefrom. One end is fitted and fixed. A cylindrical disk support 1b is formed on the outer peripheral side of the hub 1 and a disk rotating body (not shown) such as an optical disk is mounted on the upper surface. further,
A recess having a flat bottom surface is formed between the rib portion 1a of the hub 1 and the disk support portion 1b. A yoke plate 3 made of an iron-based magnetic material is placed on a flat surface of the concave portion, and a chucking magnet 4 for adsorbing the disk rotating body in the direction of the hub base 1 is placed on the yoke plate 3 on the upper surface thereof. Is placed.

A magnet holder 5 is provided on the outer peripheral edge of the chucking magnet 4. The magnet retainer 5 has a flange at the upper part on the inner peripheral side, and has a flange at the lower part of the outer peripheral edge of the chucking magnet 4. An elastic material made of a wave spring 6 is interposed between these two flanges. The magnet holder 5 has three mounting holes formed at equal angles as shown in FIG. Screws 7 penetrating through the mounting holes of the yoke plate 4 are inserted into the mounting holes, respectively.
, The flange of the magnet presser 5 presses the wave spring 6, and the elasticity presses the flange of the chucking magnet 4 from above to fix the chucking magnet 4 to the hub base 1.

On the other hand, a rotor yoke 8 made of a magnetic material such as iron, which is formed in a cylindrical shape, is attached to the outer peripheral edge of the hub 1. A cylindrical driving magnet 9 is mounted on the inner peripheral surface of the rotor yoke 8, and a stator core 10 faces the inner peripheral surface of the driving magnet 9 at an appropriate interval. The stator core 10 is a holder 11
The rotary drive shaft 2 is rotatably supported via a pair of ball bearings 12 on the inner peripheral side of the cylindrical portion of the holder 11. Further, a drive coil 13 is wound around the stator core 10, and a predetermined current is applied to the drive coil 13, whereby the drive magnet 9 and the rotor yoke 8 are urged to rotate, and the rotary drive shaft 2 rotates. A flexible circuit board 14 is provided on the upper surface of the flange 11 a integrally formed with the holder 11, and is configured to transmit an electric current or the like to the drive coil 13.

Next, another embodiment of the disk chucking mechanism according to the present invention will be described. FIG. 3 shows a structure in which the flange of the chucking magnet 4 is fixed to the hub 1 by the elasticity of an elastic material which also serves as a magnet holder. That is, the elastic material made of the leaf spring 15 is formed in a ring shape,
Three pressing portions 15a protruding in the center direction are formed at equal angles. The leaf spring 15 has three mounting holes formed at equal angles as shown in FIG. Screws 16 penetrating through the mounting holes of the yoke plate 3 are screwed into the mounting holes, respectively, so that the three pressing portions 15a of the leaf spring 15 press the flange of the chucking magnet 4 from above by elastic force. Then, attach the chucking magnet 4 to the hub 1
Fixed to In the case of this example, since the leaf spring 15 has a function of holding down the magnet and the function of an elastic material for fixing the chucking magnet 4 to the hub 1 by elasticity, the number of parts is reduced.

Although the embodiments shown in the drawings are configured for an optical disk, the present invention is not limited to an optical disk, but can be applied to any disk device such as a magnetic disk. Further, the elastic material may be changed to rubber or plastic having elasticity.

[0012]

As is clear from the above description, the disk chucking mechanism of the present invention is fixed to the hub base by pressing the chucking magnet with the elastic material.
The chucking magnet can be securely fixed to the hub base.
Further, since there is no need for bonding, it is possible to prevent an accident that the chucking magnet is peeled off when the disc is attached or detached. Furthermore, since the chucking magnet is fixed by the elastic material, the fixing operation can be simplified, and when the components such as the chucking magnet are damaged, they can be easily replaced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a disc chucking mechanism according to the present invention.

FIG. 2 is a plan view of the disk chucking mechanism according to the present invention.

FIG. 3 is a sectional view showing another embodiment of the disc chucking mechanism according to the present invention;

FIG. 4 is a plan view of another embodiment of the disc chucking mechanism according to the present invention.

FIG. 5 is a sectional view showing a conventional disk chucking mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hub stand 1a Rib part 1b Disk support part 2 Rotation drive shaft 3 Yoke plate 4 Chucking magnet 5 Magnet retainer 6 Wave spring (elastic material)

Claims (1)

(57) [Scope of request for utility model registration] 1. A chucking mechanism in which a hub on which a disk rotating body is mounted is fixed to a rotation drive shaft, and a chucking magnet for attracting the disk rotating body in the direction of the hub mounting is mounted and fixed on the hub. , Wherein the chucking magnet is fixed to the hub base by a magnet pressing member via an elastic material.