JP2003059146A - Turntable device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turntable device which can prevent the generation of vibration when a disk is rotated at a high speed. SOLUTION: A placing part 3 is formed for placing a disk D configured to read a signal by an optical pickup, a hard sheet 6 is stuck and fixed onto a disk placing face 3A of a turntable 2 to be rotationally driven by a motor, and a soft sheet 7 is stuck and fixed to the under surface of the inner peripheral side so that the vibration of the disk D can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turntable device incorporated in an optical disk device.

[0002]

2. Description of the Related Art Optical disc reproducing apparatuses configured to read signals recorded on a disc using an optical pickup are in widespread use. Such an optical disc reproducing apparatus has a disc mounted thereon. And a turntable for rotating the disc.

As a typical optical disk reproducing apparatus, a CD player is generally well known, but recently, a CD-RO used in combination with a computer.
An optical disc reproducing device called an M player has become widespread.

Further, an optical disk recording 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 read out a signal at a high speed. Therefore, recently, the CD-ROM player is 4 times or 8 times as much as a specified linear velocity. It is configured to rotate the disk at a high linear velocity such as double and 12 times to perform a signal reading operation. In addition, since an optical disc recording / reproducing apparatus capable of recording signals on a disc is also required to perform a high-speed recording operation, the recording operation is performed in a state where the rotation speed of the disc is higher than the specified linear velocity. It is configured to be able to do.

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 turntable device that solves the above problem.

[0008]

In the turntable device of the present invention, a hard sheet is adhered and fixed to a disk mounting surface of a mounting portion formed on the turntable, and a soft sheet is provided below the inner peripheral side thereof. The rotational characteristics of the disc are improved by the adhesive fixing.

[0009]

1 is a side sectional view showing a turntable device of the present invention, and FIG. 2 is a plan view of the turntable device of the present invention.

In FIG. 1, reference numeral 1 is a rotary shaft of an electric motor for rotationally driving the disk D, and 2 is a turntable press-fitted and fixed to the rotary shaft 1 so as to rotate together with the rotary shaft 1, on which the disk D is mounted. A mounting portion 3 is formed, and a press-fitting portion 4 into which the rotary shaft 1 is press-fitted is formed.

A press-fitting portion 4 formed in the turntable 2 is attached to the turntable 3 so as to rotate integrally with the turntable 3 and is fitted with a central hole D1 formed in the disk D. A centering member for positioning the disk D.

Reference numeral 6 denotes a hard sheet adhered and fixed to the disk mounting surface 3A of the mounting portion 3 of the turntable 2 by a double-sided tape or the like, and as shown in FIG. It is provided in a ring shape. Reference numeral 7 denotes a soft sheet which is adhesively fixed by a double-sided tape or the like in a ring-shaped mounting groove 3B provided below the inner peripheral side of the hard sheet 6, and is provided in a ring shape as shown in FIG. ing.

In such a structure, the material and thickness of the soft sheet 7 are selected and set according to the vibration frequency of the disk D. Further, when the disc D is placed on the placing portion 3 of the turntable 2, the disc D
The thicknesses of the hard sheet 6 and the soft sheet 7 are set so that they are horizontal. Although the turntable device according to the present invention is configured as described above, a known clamp mechanism called ball chucking, for example, is used as the clamp mechanism for holding the disk D on the mounting portion 3 of the turntable 3. The description will be omitted because it can be done.

The present invention is configured as described above, and when the electric power is supplied to the electric motor, the rotary shaft 1 thereof is
Are driven to rotate at a desired rotation speed. When the rotary shaft 1 rotates, the turntable 2 press-fitted and fixed to the rotary shaft 1 is rotationally driven, so that the disk D mounted on the mounting portion 3 of the turntable 2 has a desired rotational speed. Will be driven to rotate. When the disk D has an eccentric center of gravity or a warp in the rotational driving state,
The disk D tries to vibrate with a portion in contact with the hard sheet 6 as a fulcrum. At this time, the soft sheet 7 provided below the inner peripheral side of the hard sheet 6 acts to suppress the vibration of the disk D. To do. Therefore, even if the disk D is rotated at a high speed, it is possible to prevent the disk D from vibrating, so that no surface wobbling occurs on the disk D.

In this embodiment, the hard sheet 6 and the soft sheet 7 are arranged in a ring shape on the disk mounting surface 3A of the turntable 2. However, they may be arranged at a plurality of positions so as to form a predetermined angle. You can also do it. The material and thickness of each sheet are set in consideration of the vibration frequency of the disc D.

[0016]

In the turntable device of the present invention, the hard sheet is adhered and fixed to the disk mounting surface of the mounting portion provided on the turntable, and the soft sheet is adhered and fixed below the inner peripheral side thereof. It is possible to suppress the vibration of the disc that occurs when the disc is rotated at a high speed. Therefore, by using the turntable device of the present invention, the signal reading operation from the disk and the signal recording operation on the disk can be accurately performed even in a high speed rotation state.

Further, according to the present invention, since the mounting groove into which the soft sheet is inserted is formed in the mounting portion, the fixing operation of the soft sheet can be accurately performed.

Further, according to the present invention, since the material of the soft sheet is set according to the vibration frequency of the disk, the vibration suppressing effect can be enhanced.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a turntable device of the present invention.

FIG. 2 is a plan view of a turntable device according to the present invention.

[Explanation of symbols]

1 rotation axis 2 turntable 3 Placement section 5 Centering member 6 hard sheet 7 Soft sheet D disk

Claims (3)

[Claims] 1. A turntable having a mounting portion on which a disc is mounted, wherein a hard sheet is adhered and fixed to a disc mounting surface of the mounting portion, and a soft sheet is provided below the inner peripheral side thereof. A turntable device characterized by being adhesively fixed. 2. The turntable device according to claim 1, wherein a mounting groove into which the soft sheet is inserted is formed in the mounting portion. 3. The turntable device according to claim 1, wherein the material of the soft sheet is set according to the vibration frequency of the disc.