JPH08221858A - Disk chucking mechanism - Google Patents

Abstract

PURPOSE: To obtain the disk chucking mechanism capable of simply attaching and detaching a disk as a storage medium and accurately holding the disk and moreover allowing thin constructive formation. CONSTITUTION: A magnet 27 is arranged around a spheroidal member 26 consisting of plural magnetic substances for holding the disk 24, and the spheroidal member 26 is energized to be given a load in the centrifugal direction by magnetic force of the magnet 27, so that the disk 24 is accurately pressed to the side of a turntable 23 and is held thereon. By this method, a wobble of the disk 24 to a rotary shaft 22 of a motor 21 can be suppressed. Then, a load energization member arranged movably back and forth in the centrifugal direction inside the spheroidal member is energized to be given a load in the centrifugal direction by centrifugal force due to the rotation of the turntable 23, and the disk 24 is accurately pressed to the side of the turntable 23 and held thereon. Consequently, the wobble of the disk 24 to the rotary shaft 22 can thus be suppressed.

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 for holding a disk in a disk drive device in which an optical disk or a magneto-optical disk, which is a recording medium, is mounted to record and reproduce information. is there.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for disk drive devices for recording and reproducing information using optical disks and magneto-optical disks as recording media. The disk drive device is provided with a disk chucking mechanism for holding and fixing the disk. The conventional disk chucking mechanism will be described below.

FIG. 9 is a sectional view of a conventional disk chucking mechanism, FIG. 10 is an enlarged sectional view of the same, and FIG. 11 is a sectional view of the same. In FIG. 9, a turntable 3 on which a disc 5 is mounted is attached to a rotary shaft 2 of a motor 1,
The magnet 4 is firmly fixed to the turntable 3.

A magnetic plate 8 is fixed to a clamper plate 7 which is attached to the housing 10 so as to be movable vertically and horizontally and in order to hold and fix a disk 5 which is a storage medium. 4 and the magnetic plate 8 generate attractive force on the turntable 3
The disc 5 is held and fixed by sandwiching the disc 5 with the and clamper plate 7.

The clamper plate 7 is provided with an anti-slip sheet 6 which plays a role of preventing slippage of the disk 5 in the rotation direction and protecting it from damage. Further, a clamper mounting member 9 is provided between the housing 10 and the clamper plate 7 so as to be mounted on the housing 10 so as to be movable in the vertical, horizontal and rotational directions. Since the diameter of the flange portion of the clamper plate 7 is larger than the diameter of the opening portion of the clamper attaching member 9, the clamper plate 7 will not come off.

Further, as shown in FIG. 11, there is also known a disk chucking mechanism for holding a disk 5 by urging a load in the centrifugal direction on a plurality of spherical members 11. This is because the elastic member 12 is placed inside the spherical member 11
The elastic member 12 includes an O-ring and a coil spring.

[0007]

However, in the above-described conventional disk chucking mechanism, a clamper is required above the disk, which is a problem for thinning the disk drive device. Further, in a disk chucking mechanism that holds a disk with a spherical member, there have been problems with variations in applied load on each spherical member and workability of attaching elastic members.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a disk chucking mechanism which enables the disk drive device to be made thinner and which can accurately hold a disk with a uniform load.

[0009]

In order to achieve the above object, the disk chucking mechanism of the present invention omits the clamper portion and arranges a plurality of spherical members and magnets,
The load is applied to the spherical member by the magnetic force.

Further, the load is biased to the spherical member by the centrifugal force generated in the load biasing member movably arranged in the centrifugal direction.

[0011]

With the above construction, the clamper can be omitted, so that the disk drive device can be designed thin and a uniform load can be applied to the disk, so that the disk can be held accurately. Becomes

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view of a disk chucking mechanism of a first embodiment of the present invention, FIG. 2 is an enlarged sectional view of the same,
FIG. 3 is a perspective view of a disk drive device using the disk chucking mechanism. In FIG. 1, reference numeral 21 is a motor, and 22 is a rotation shaft thereof. The motor 21 generates a driving force in a rotation direction in order to rotate a disk 24 which is a disk-shaped recording medium such as an optical disk or a magneto-optical disk.
A turntable 23 is fitted on the rotary shaft 22 of the.
When the rotary shaft 22 rotates, the turntable 23 also rotates at the same angular velocity.

A disk 2 is provided above the turntable 23.
Although the hub portion 23a that fits with the center hole of No. 4 is provided, the turntable 23 and the hub portion 23a may be integrated type or separated type. Hub part 23
There is a hollow portion 23b and a plurality of slits 23c in a, and spherical members 26 made of the same number of magnetic materials as the slits 23c are arranged in the slits 23c. The spherical member 26 is capable of advancing and retracting in the centrifugal direction and the axial direction, and a cap 25 is attached so that the spherical member 26 does not fall to the motor 21 side. A magnetic back yoke 28 is firmly attached to the lid 29 of the housing, and a magnet 27 is attached to the back yoke 28 only by the attractive force of the magnetic force. Further, since the magnet 27 is attached to the back yoke 28, the magnetic force of the magnet 27 is
7 Amplified from the original magnetic force.

The magnet 27 is arranged at a position not in contact with the spherical member 26, and when the lid 29 is closed, an attractive force is generated between the spherical member 26 and the magnet 27 by the magnetic force of the magnet 27. Due to this attractive force, a load that causes the spherical member 26 to project from the slit 23c is urged, and the spherical member 26 comes into contact with the upper edge of the center hole of the disk 24, so that the disk 2
4 is pressed to the turntable 23 side, the disk 24
Is held. The turntable 23 and the hub portion 23 are driven by the motor 21 driving and the rotating shaft 22 rotating.
The a and the spherical member 26 also rotate. The attractive forces applied to the spherical member 26 are all equal, and a uniform load is always applied to the spherical member 26 to press and support the disk 24 mounted on the turntable 23 toward the turntable 23 with a uniform load. . As a result, the disk 24 can be held accurately and the surface runout with respect to the rotary shaft 22 can be suppressed.

Next, description will be made with reference to the sectional view of FIG. It is necessary to open the lid 29 in order to attach / detach the disk 24, but when the lid 29 is opened, the magnet 27 moves away from the spherical member 26 and the magnetic force weakens, so that the spherical member 26 becomes free. 24
An unnecessary load is not applied to the disc 24 when the disc 24 is attached or detached, and the workability of attaching and detaching the disc 24 is improved. In FIG. 3, the disc drive device has a lid portion that opens and closes in the vertical direction, but any method such as a disc drive device in which a disc is mounted on a horizontally movable tray and the disc is mounted is not limited.

Next, a second embodiment of the present invention will be described. 4 is a sectional view of a disk chucking mechanism of a second embodiment of the present invention, FIG. 5 is an enlarged exploded perspective view of the same, FIG. 6 is an enlarged top view of the same cap, FIG. 7 is an enlarged front view of the same cap, and FIG. FIG. 4 is an enlarged sectional view of the same. In FIG. 4, the motor 21
And its rotary shaft 22, a turntable 23 on which the disc 24 is mounted, a hub portion 23a that fits into the center hole of the disc 24, its hollow portion 23b, and a plurality of slits 23c.
Is the same as in the first embodiment.

The same number of spherical members 33 as the slits 23c for contacting the disk 24 and holding the disk 24 are arranged in the hollow portion 23b. The spherical member 33 is the motor 2
The cap 31 is attached so as not to fall to the first side, but the cap 31 is provided with the same number of load urging members 32 as the spherical members 33 so as to be capable of advancing and retracting in the centrifugal direction. When the motor 21 drives and the rotary shaft 22 makes a rotary motion, the turntable 23, the hub portion 23a, the spherical member 3
3 and the load biasing member 32 also rotate. Since the load urging member 32 is capable of advancing and retracting in the centrifugal direction, it contacts the spherical member 33 by the centrifugal force and urges the load in the centrifugal direction. Since this load is due to the centrifugal force, the loads applied to the respective spherical members 33 are equal, and the disk 24 mounted on the turntable 33 is pressed toward the turntable 23 side with a uniform load. To support. As a result, the disk 24 can be held accurately and the rotary shaft 2
The surface wobbling with respect to 2 can be suppressed.

Next, description will be made with reference to the top view of FIG. 6 and the front view of FIG. The cap 31 has the same number as the load urging member 32 at a position continuous with the outer periphery of the cap 31,
A slit 31a is provided at a position extending in the centrifugal direction. The load urging member 32 includes a load urging portion 32 a and a fitting portion 32.
The width of the fitting portion 32b is narrower than the width of the slit 31a, and the fitting portion 32b is positioned so that the load biasing portion 32a is located above the cap 31. It is inserted into the slit 31a. Load biasing member 3
2 is arranged so as to be able to advance and retreat in the centrifugal direction A or the opposite direction B. Since the widths of the load biasing portion 32a and the slip-out preventing portion 32c are larger than the slit 31a, the load biasing member 3
2 does not come out of the cap 31 in the vertical direction. When the cap 31 is rotated by driving the motor 21, the load urging member 32 moves in the centrifugal direction A, and urges the spherical member 33 with a load in the centrifugal direction A.

As in the first embodiment, the second embodiment has a lid portion that opens and closes in the vertical direction, and a disk drive device for mounting a disk directly on a turntable,
Any method may be used, such as a disk drive device in which a disk is placed on a horizontally movable tray and the disk is mounted.

Further, by combining the first embodiment and the second embodiment of the present invention, the load urging member 32 is made of a magnetic material, the magnet is arranged outside the spherical member 33, and the magnet and the load urging member are arranged. If a structure for generating an attractive force between the disk 32 and 32 is applied, the load for holding the disk further increases.

[0021]

As described above, according to the present invention, it is possible to realize a thin disk drive device in which a disk can be easily attached and detached and which can be accurately and surely held. You can

[Brief description of drawings]

FIG. 1 is a sectional view of a disk chucking mechanism according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of a disk chucking mechanism according to a first embodiment of the present invention.

FIG. 3 is a perspective view of a disk drive device using the disk chucking mechanism of the first embodiment of the present invention.

FIG. 4 is a sectional view of a disk chucking mechanism according to a second embodiment of the present invention.

FIG. 5 is an enlarged exploded perspective view of a disk chucking mechanism according to a second embodiment of the present invention.

FIG. 6 is an enlarged top view of the cap of the disk chucking mechanism of the second embodiment of the present invention.

FIG. 7 is an enlarged front view of the cap of the disk chucking mechanism of the second embodiment of the present invention.

FIG. 8 is a partially enlarged sectional view of a disk chucking mechanism according to a second embodiment of the present invention.

FIG. 9 is a sectional view of a conventional disk chucking mechanism.

FIG. 10 is a partially enlarged sectional view of a conventional disc chucking mechanism.

FIG. 11 is a sectional view of a conventional disk chucking mechanism.

[Explanation of symbols]

 21 Motor 22 Rotating Shaft 23 Turntable 23a Hub 23b Hollow 23c Slit 24 Disk 25 Cap 26 Spherical Member 27 Magnet 28 Back Yoke 29 Housing Lid 31 Cap 32 Load Biasing Member 33 Spherical Member

Claims (5)

[Claims] 1. A rotatable turntable on which a disc having a central hole is placed, a hub portion protruding from the turntable and fitted into the central hole of the disc, and a centrifugal portion more than the outer periphery of the hub portion. A plurality of pieces projecting in a direction and being biased by a load in the centrifugal direction and installed so as to be able to advance and retreat inside the hub portion and contact the upper edge of the center hole of the disk to press and support the disk on the turntable side. A disk chucking mechanism comprising: a spherical member. 2. The disk chucking mechanism according to claim 1, wherein a uniform load in the centrifugal direction is applied to each of the plurality of spherical members. 3. The spherical member is made of a magnetic material, and the load applied to the spherical member is a magnetic force, and a magnet is installed outside the spherical member so as not to contact the spherical member. The disk chucking mechanism according to claim 2. 4. The load is applied to the spherical member by a centrifugal force of a load biasing member, and the load biasing member is arranged inside the spherical member so as to be movable in a centrifugal direction. Item 2. The disk chucking mechanism according to Item 2. 5. The load is applied to the spherical member by the magnetic force and centrifugal force of a load urging member made of a magnetic material, and the magnet is installed outside the spherical member so as not to contact the spherical member. The disk chucking mechanism according to any one of claims 2 to 4, wherein the load urging member is installed inside the spherical member so as to be movable in a centrifugal direction.