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Optical disc medium,its making method,rotary disc and optical disc apparatus

A manufacturing method and technology of optical discs, applied to optical recording/reproduction, optical recording carriers, recording information on magnetic discs, etc., can solve the problems of data recording area limitation, low manufacturing efficiency, high manufacturing cost, etc. , to achieve the effect of improving manufacturing efficiency and high density of focus errors

Inactive Publication Date: 2005-02-16
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In addition, with the above-mentioned conventional optical disc medium manufacturing method, since the magnetic disks etc. are manufactured one by one, the manufacturing or manufacturing efficiency is very low and high manufacturing cost is required.
In addition, in the case of an optical disc medium having a center hole formed in a metal base, a data recording area or an area where images, characters, etc. are displayed are limited.

Method used

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  • Optical disc medium,its making method,rotary disc and optical disc apparatus
  • Optical disc medium,its making method,rotary disc and optical disc apparatus
  • Optical disc medium,its making method,rotary disc and optical disc apparatus

Examples

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Embodiment 1

[0059] First, refer to figure 1 The outline of the main parts of the optical disc apparatus of the present invention will be described. The optical disc medium 1 of the present invention typified by a compact disc (CD) and a digital video disc (DVD) is formed to reproduce (read) data therefrom using a light beam. However, the optical disc medium 1 may also be formed so that data is recorded thereon and / or reproduced (read) therefrom in a magneto-optical form, such as a magneto-optical disc (MO). Although the details of the optical disc medium 1 will be described below, a metal base made of a magnetic substance is used as the disc base of the optical disc medium 1 . It should be noted that conventional optical disc media use a disc base made of polycarbonate (PC).

[0060] The turntable 3 is fixed to one end of the motor shaft 2 a of the spindle motor 2 by press fitting, bonding, fastening with screws or the like. Although details of the turntable 3 will be described below, ...

Embodiment 2

[0090] Figure 11 Embodiment 2 of the present invention is shown. see Figure 11 , the metal base 5 of the optical disc medium 1 is magnetized so that the optical disc medium 1 is attracted by the magnetic force MF of the metal base 5 onto the disc receiving surface 3a of the turntable 3 made of a magnetic substance such as iron.

Embodiment 3

[0092] Figure 12 Embodiment 3 of the present invention is shown. see Figure 12, a plurality of magnets 18 are embedded in the disc receiving surface 3a of the vial 3 so that the optical disk medium 1 is attracted to the disc receiving surface 3a of the turntable 3 by the magnetic force MF of the magnets 18 . In this case, the turntable 3 may be made of a non-magnetic material such as plastic.

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Abstract

An optical disk that is prevented from being warped when it is driven to rotate by a turntable includes a disk substrate formed as a metal substrate made of a magnetic substance. When the optical disk is mounted on a disk receiving face of the turntable, the metal substrate is attracted to the disk receiving face of the turntable by the magnetic force, thereby to correct any warping of the optical disk medium with a high degree of accuracy.

Description

technical field [0001] The present invention relates to an optical disc medium on which data is recorded and / or reproduced by using an optical system or a magneto-optical system, a turntable for driving an optical disc to rotate, and an optical disc device in which an optical pickup device is used to Data is recorded on and / or reproduced from the optical disc medium while the turntable is driven by a spindle motor to rotate the optical disc medium. [0002] The present invention also relates to a method of manufacturing an optical disc medium onto which data is recorded and / or from which data is reproduced using an optical system or a magneto-optical system. Background technique [0003] An optical disc medium, such as an optical disc or a magneto-optical disc, on which data can be recorded and / or reproduced using an optical system or a magneto-optical system, includes: Or a magnetic film etc. on the two and a transparent protective film applied as a coating of the data dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/258G11B17/028G11B19/20G11B23/00G11B23/40
CPCG11B23/0021G11B7/258G11B17/0282G11B19/2009G11B17/028G11B23/40G11B7/2532
Inventor 金泽孝恭三浦隆博渡边英俊
Owner SONY CORP