JP2003045103A - Disk drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk drive which rotationally drives a turntable on which a disk is placed. SOLUTION: The disk drive consists of: a turntable 3 provided with a placing part 4 which is press-fixed at the rotation axis 2 of a motor 1 and on which a disk D is placed, and a centering part 6 inserted into the central hole formed in the disk D; and a clamping member 8 which presses from above the disk D placed on the placing part 4 of the turntable 3. While making the diameter of the contact part of the clamping member 8 which comes in contact with the upper surface of Disk D larger than the diameter of the turntable 3, a damping sheet 14 is stuck on the contact surface.

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 for rotationally driving a disk mounted on a turntable.

[0002]

2. Description of the Related Art Optical disc reproducing apparatuses for reading a signal recorded on a disc using an optical pickup are in widespread use. Such an optical disc reproducing apparatus includes a turntable on which the disc is mounted. ing. The disc mounted on the turntable is fixedly held on the turntable so as to rotate together with the turntable by means called a clamp.
As the clamping means, one utilizing the attractive force of a magnet has been developed.

A CD player is generally used as an optical disk reproducing apparatus, but recently, a disk called a CD-ROM in which data signals used for a computer are recorded instead of audio signals such as music is reproduced. An optical disk reproducing device called a CD-ROM player has become widespread.

Further, an optical disc recording / reproducing apparatus has become widespread which is capable of recording a signal on a disc as well as a reproducing operation of a signal recorded on the disc.

[0005]

Unlike a CD player which reproduces an audio signal, a CD-ROM player is required to perform a high-speed signal read operation. An optical disk reproducing apparatus configured to rotate a disk at a high linear velocity such as 8 times and 12 times to perform a signal reading operation has been commercialized. In addition, an optical disk recording / reproducing apparatus capable of recording a signal on a disk is also required to perform a high speed recording operation in the same manner. Therefore, the recording operation is performed in a state where the rotation speed of the disk is higher than the specified linear speed. A device that can be performed has been commercialized.

When the disc is driven to rotate at a high speed, surface wobbling occurs due to the eccentricity of the disc, warpage, etc., and the reading operation of the signal recorded on the disc and the recording operation of the signal on the disc are performed. There is a problem that it cannot be done accurately.

The present invention is intended to provide a disk drive device which solves the above problems.

[0008]

According to the present invention, there is provided a mounting portion which is press-fitted and fixed to a rotating shaft of an electric motor and on which a disc is mounted, and a centering portion which is inserted into a center hole formed in the disc. A turntable provided,
A clamp member for pressing the disc mounted on the mounting portion of the turntable from above, the diameter of the contact portion of the clamp member that comes into contact with the upper surface of the disc being larger than the diameter of the turntable, and the contact surface. A vibration damping sheet is attached to the disk to prevent surface wobbling of the disk.

[0009]

FIG. 1 is a side sectional view of an essential part showing an embodiment of a disk drive device of the present invention. In the figure, reference numeral 1 denotes an electric motor which is rotated by being supplied with power when reproducing a signal recorded on the disc D and recording a signal on the disc D, which has a rotating shaft 2 and a fixed substrate. It is attached and fixed to a (not shown) by a screw or the like.
Reference numeral 3 is a turntable in which a mounting portion 4 on which the disc D is mounted and a press-fitting hole 5 which is press-fitted into the rotary shaft 2 of the electric motor 1 are formed, and which is inserted into a central hole formed in the disc D. The centering portion 6 is formed. A ring-shaped magnetic body 7 is fixed to the upper surface of the centering portion 6 with an adhesive or the like.

Reference numeral 8 denotes a clamp member that is displaced to the position shown when the disc is clamped on the turntable 3, and is fitted to the contact portion 9 for pressing the upper surface of the disc D from above and the centering portion 6 of the turntable 3. It is configured with a fitting portion 10 that fits. Reference numeral 11 denotes an attachment substrate which is attached and fixed to the clamp member 8 and is made of a magnetic material, and a ring-shaped magnet 12 is adhesively fixed. Reference numeral 13 is a through hole formed in the central portion of the mounting substrate 11 and serves to release air.

In such a structure, the contact portion 9 formed on the clamp member 8 of the present invention is configured such that the diameter of the contact portion contacting the upper surface of the disk D is larger than the diameter of the turntable 3. ing. A ring-shaped vibration damping sheet 14 is attached to the contact surface provided so as to contact the upper surface of the disk D. The vibration damping sheet 14 is attached to the outside of the placing portion 4 provided on the turntable 3.

The disk drive device of the present invention is constructed as described above. Next, the clamping operation of the disk D will be described. After placing the disc D on the placing portion 4 of the turntable 3 so that the centering portion 6 of the turntable 3 is inserted into the center hole provided in the disc D, the clamp member 8 is set to the clamp position. When moved, the state shown in the figure is obtained. Since such a clamp operation can be easily performed by using a known mechanism, the description thereof will be omitted.

The state shown in the figure shows a state in which the disk D is clamped on the turntable 3 by the above-mentioned operation, and as is apparent from the figure, the magnet 12 and the centering portion 6 provided on the turntable 3 are shown. Since the magnetic body 7 fixed to the upper surface of the magnetic body 7 faces the magnetic body 7, the attractive force of the magnet 12 acts on the magnetic body 7. Since the magnetic body 7 is fixed on the upper surface of the centering portion 6 provided on the turnbull 3, a biasing force in the direction of arrow A acts on the clamp member 8 to which the magnet 12 is attached and fixed. It will be.

As a result, the contact portion 9 formed on the clamp member 8 causes the upper surface of the disc D to turn on the turntable 3.
The disk D is held by the clamp member 8 on the turntable 3 in order to press it against the mounting portion 4.
Therefore, the disk D can be rotationally driven by the electric motor 1, and the signal reading operation and the signal recording operation recorded on the disk D can be performed. When the disc D is clamped by the mounting portion 4 of the turntable 3, the damping sheet 14 is provided on the contact surface of the contact portion 9 provided on the clamp member 8 with the upper surface of the disc D. Since it is attached, the damping sheet 14 is in pressure contact with the upper surface of the disk D. Therefore,
When the disk D is rotationally driven by the rotational driving operation of the turntable 3 by the electric motor 1, even if the disk D causes surface vibration, the vibration damping sheet 14 prevents the surface vibration. Therefore, even if the disk D is rotated at a high speed, it is possible to prevent the surface wobbling.

[0015]

As described above, the present invention provides a clamp member provided to press the disc mounted on the mounting portion of the turntable provided with the centering portion inserted into the center hole formed from the disc from above. Since the diameter of the contact part that contacts the upper surface of the disk is larger than the diameter of the turntable and a damping sheet is attached to the contact surface, it is possible to reliably prevent surface wobbling even when the disk is rotated at high speed. I can.

Further, according to the present invention, since the vibration damping sheet is attached to the outside of the placing portion of the turntable, the vibration damping action works at the position where the surface vibration of the disk is likely to occur, so that the vibration damping effect is obtained. Can be raised.

Further, according to the present invention, since the pressing force of the clamp member with respect to the disk is obtained by the attraction force of the magnet, the structure is simplified.

[Brief description of drawings]

FIG. 1 is a side sectional view of an essential part showing an embodiment of a disk drive device of the present invention.

[Explanation of symbols]

D disk 1 electric motor 3 turntable 4 Placement section 6 Centering section 7 Magnetic material 8 Clamp member 9 Contact part 12 magnets 14 damping sheet

Claims (3)

[Claims] 1. A turntable, which is press-fitted and fixed to a rotating shaft of an electric motor, and which is provided with a mounting portion on which a disc is mounted and a centering portion which is inserted into a center hole formed in the disc. A clamp member for pressing the disc mounted on the mounting portion of the turntable from above, the diameter of the contact portion of the clamp member that comes into contact with the upper surface of the disc being larger than the diameter of the turntable, and the contact surface. A disk drive device characterized in that a damping sheet is attached to the. 2. The disk drive device according to claim 1, wherein the vibration damping sheet is attached at a position outside the mounting portion provided on the turntable. 3. The disk drive device according to claim 1, wherein the pressing force of the clamp member with respect to the disk is obtained by the attraction force of the magnet.