JPH11259940A - Disk drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the thickness of the device and to suppress the resonance of a disk due to high-speed revolution of the disk by clamping the disk over the turntable rotatively driven by a spindle motor by the clamper which has a thin plate shape and is freely attachable and detachable. SOLUTION: The device has the structure in which a clamper 13, which has a disk shape made of a thin plate, is used to clamp a disk 20 over a turntable 6. The clamper 13 is freely attachable and detachable and has a magnetic attracting means to have a force to clamp the disk 20. The whole structure of the clamper 13 is formed by using a magnetic metallic plate material such as iron. In the center section of the clamper 13, a projected part 14, which has a round shape having the diameter that is approximately same as the diameter of a center hole 20a of the disk 20, is formed in an embossed manner. Moreover, a center hole 15 is provided corresponding to a driving shaft 7a of a spindle motor 7 at the center of the part 14. Thus, the clamper 13 clamps the disk having a wider area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device, and more particularly to a disk clamp structure.

[0002]

2. Description of the Related Art First, an example of a conventional disk drive will be described with reference to FIGS. In FIG. 1, reference numeral 1 denotes a thin disk drive such as a so-called CD-ROM or DVD-ROM as a whole, and reference numeral 2 denotes an outer housing of the disk drive. It is provided in.

The main body 3 of the disk drive has a disk tray shape, that is, a circular disk set recess 4 is provided on the upper surface of the main body 3 of the disk drive. ) 20 is set.

A disk-shaped turntable 6 on which a disk 20 is placed and supported at the center of the disk set recess 4 is placed on the mechanism substrate 5 exposed to the disk set recess 4.
Is provided. The turntable 6 is rotated integrally with a drive shaft 7a of a spindle motor 7. A circular centering projection 8 is provided at the center of the turntable 6, and the disc 20 has a center hole formed in the centering projection 8. 20a is set on the turntable 6 in a state where it is fitted and centered, and clamped in that state.

Further, an optical pickup 9 is provided on the mechanism substrate 5.
Are supported so as to be movable in the radial direction of the disk.
Is irradiated with a laser beam for recording or reproducing a signal.

The disk 20 is rotated integrally with the turntable 6 by driving the spindle motor, and the optical pickup 9 is moved from the inner circumference to the outer circumference of the disk 20 by the feed mechanism, thereby recording or reproducing signals. The operation is performed. Incidentally, the recording or reproducing operation of this signal is performed in a state where the disk drive device main body 3 is completely accommodated in the outer casing 2.

In the conventional disk drive device configured as described above, the disk 20 is
A so-called ball clamp method is employed as a structure for clamping the ball.

That is, as is apparent from FIG. 2, a plurality of clamp balls 10 are built in the centering projection 8 of the turntable 6 so as to partially protrude from the outer peripheral surface thereof. An elastic force is always applied outward by the force of the spring 11.

When the disc 20 is set on the turntable 6, the clamp hole 10 is pushed inward against the force of the spring 11 so that the center hole 20a is fitted into the centering projection 8 so that the disc 20 can be inserted. Is clamped on the turntable 6 while being pressed by the clamp ball 10.

[0010]

In the disk clamping structure of the conventional disk drive apparatus as described above, the clamp ball 10 for clamping the disk 20 and the spring 11 for clamping the disk 20 are built in the centering projection 8 of the turntable 6. Therefore, a protrusion of about 2 mm is required above the disk 20, and the space hinders the thinning of the disk drive device.

In recent years, there has been a problem of disk resonance accompanying an increase in the rotational speed of the disk. However, conventionally, only the center hole 20a of the disk 20 is clamped. I couldn't.

The present invention has been made to solve such a problem.

[0013]

In order to achieve the above object, a disk drive device according to the present invention has a structure in which a disk is clamped to a turntable which is driven to rotate by a spindle motor by a thin plate-like detachable clamper. It was done. In this structure, the clamper preferably has a diameter of about 8 cm. Further, in this structure, the clamper can obtain the clamping force of the disk by the magnetic attraction means.

[0014] With such a clamp structure, the protrusion above the disk can be made as small as the thickness of the thin plate-like clamper, so that the disk drive device can be further thinned. Becomes In addition, in this structure, the center portion of the disk can be clamped over a wide area by the clamper, so that resonance of the disk accompanying high-speed rotation of the disk can be effectively suppressed.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. In FIG. 3, reference numeral 1 denotes a thin disk drive device such as a so-called CD-ROM or DVD-ROM as a whole, and reference numeral 2 denotes an outer housing thereof. It is provided in.

The main body 3 of the disk drive has a disk tray shape, that is, a circular disk set recess 4 is provided on the upper surface of the main body 3 of the disk drive. ) 20 is set.

A turntable 6 on which the disk 20 is placed and supported at the center of the disk set recess 4 is provided on the mechanism substrate 5 exposed to the disk set recess 4. The turntable 6 is rotated integrally with the drive shaft 7a of the spindle motor 7, and the disc 20 is clamped to the turntable 6 by a clamper 13 described later.

Further, an optical pickup 9 is provided on the mechanism substrate 5.
Are supported so as to be movable in the radial direction of the disk.
Is irradiated with a laser beam for recording or reproducing a signal.

The disk 20 is rotated integrally with the turntable 6 by driving the spindle motor, and the optical pickup 9 is moved from the inner circumference to the outer circumference of the disk 20 by a feed mechanism, thereby recording or reproducing signals. The operation is performed. Incidentally, the recording or reproducing operation of this signal is performed in a state where the disk drive device main body 3 is completely accommodated in the outer casing 2.

The clamp structure of the disk in the disk drive device of the present embodiment configured as described above will be described in more detail with reference to FIGS.

In this embodiment, the disk 20 is clamped to the turntable 6 using a disk-shaped clamper 13 made of a thin plate. This clamper 13
Are detachable, and a magnetic clamping means is used to obtain a disk clamping force.

In this embodiment, the clamper 13 is formed entirely of a magnetic metal plate such as iron, and has a diameter of about 8c.
m. At the center of the clamper 13, a circular projection 14 having a diameter substantially the same as that of the center hole 20a of the disk 20 is formed so as to protrude. A hole 15 is provided.

On the other hand, a circular concave portion 16 corresponding to the convex portion 14 of the clamper 13 is provided at the center of the turntable 6, and a magnet 17 as a magnetic attraction means is fixed to the bottom thereof.

When the disk 20 is set on the turntable 6, the disk 20 is first placed on the turntable 6 with the disk 20 sandwiched between the turntable 6 and the clamper 13 as shown in FIG. At the same time, the projection 14 of the clamper 13 is
Of the turntable 6 through the center hole 20a.

In this state, the clamper 13 made of a magnetic metal material and the magnet 17 are magnetically attracted, so that the disk 20 is sandwiched between the clamper 13 and the turntable 6 as shown in FIG. Clamped tightly

In this state, the center hole 15 of the clamper 13 is fitted to the drive shaft 7a of the spindle motor 7, so that the center of the clamper 13 and the turntable 6 are accurately positioned. Therefore, the disk 20 is securely clamped in the centered state, and the eccentricity due to the displacement of the clamper is prevented, so that the disk can be rotated stably.

The disk drive apparatus of the present embodiment configured as described above has a structure in which the disk 20 is clamped using the detachable clamper 13 in the form of a thin disk. 2m less
m, that is, only a small thickness corresponding to the plate thickness of the clamper 13, so that the disk drive device can be further thinned.

Particularly, in this embodiment, a magnetic metal plate such as iron is used as the material of the clamper 13. In this case, since the material strength is high, the plate thickness can be extremely reduced to 0.5 mm or less. , And the disk drive can be made even thinner.

In this clamp structure, the clamper 1
3, the central portion (inner peripheral portion) of the disk 20 can be clamped over a wide area, so that resonance of the disk accompanying high-speed rotation of the disk can be suppressed.

In particular, in this embodiment, since the diameter of the clamper 13 is approximately 8 cm, the resonance of the disk can be suppressed more effectively. That is, the diameter of a generally used disk such as a CD or a DVD is 12 cm. In this case, a portion corresponding to a resonance node of the disk is approximately 8 cm in diameter.
3, the resonance of the disk is reliably reduced. Furthermore, this clamper 1
In No. 3, a disc having a diameter of 8 cm, such as a so-called CD single, can be reliably clamped.

Further, the clamping structure of the present embodiment has an advantage that the clamping force of the disk can be obtained by the magnetic attraction means, that is, the magnet 17, so that the structure can be implemented simply and inexpensively.

In the above-mentioned example, the case where the magnet 17 as the magnetic attraction means is arranged on the turntable 6 side is shown, but a structure in which the magnet 17 is arranged on the clamper 13 side may be adopted.

FIG. 6 shows an example of the structure. That is, in this example, a magnet 17 is fixed to the convex portion 14 at the center of the clamper 13, and a magnetic metal plate 18 such as iron is fixed to the bottom of the concave portion 16 of the turntable 6. The disk is clamped by the magnetic attraction force between the disk and the magnetic metal plate 18.

In order to further suppress the resonance of the disk, the damper 13 may be made of a damping material.
In this case, only the convex portion 14 of the clamper 13 is made of a magnetic metal material such as iron, or the magnet 17 is fixed to the convex portion 14. Here, as the damping material, for example, VEM (product name) manufactured by Sumitomo 3M Limited is preferably used.

Although the embodiment of the present invention has been described above, the present invention is not limited to the configuration described here.
It goes without saying that various other embodiments can be adopted.

[0036]

As described above, according to the present invention, it is possible to further reduce the thickness of the disk drive device, and it is possible to effectively suppress the resonance of the disk accompanying the high-speed rotation of the disk.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a conventional disk drive device.

FIG. 2 is a side view showing the same disk clamping structure.

FIG. 3 is a perspective view showing a disk drive device according to the present invention.

FIG. 4 is a side view showing the disk clamping structure,
(A) shows the state before clamping of the disk, and (B) shows the state after clamping.

FIG. 5 is a perspective view showing the same disk clamping structure;
(A) is a state in which the clamper is turned upside down, and (B) is a turntable.

FIG. 6 is a perspective view showing another example of the disk clamping structure, in which (A) is a state in which the clamper is turned upside down,
(B) is a turntable.

[Explanation of symbols]

1 ‥‥ disk drive device, 6 ‥‥ turntable,
7 ‥‥ spindle motor, 13 ‥‥ clamper, 17
{Magnet (magnetic attraction means), 20} Disk

Claims (3)

[Claims] 1. A disk drive device wherein a disk is clamped by a thin plate-shaped detachable clamper on a turntable that is driven to rotate by a spindle motor. 2. The disk drive device according to claim 1, wherein said clamper has a diameter of about 8 cm. 3. The disk drive device according to claim 1, wherein said clamper can obtain a disk clamping force by magnetic attraction means.