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Optical disk apparatus

A technology for optical disc devices and moving devices, which is applied to the configuration/installation of heads, recording of information on magnetic discs, and optical recording/reproduction, etc., which can solve problems such as low performance and unstable control of disc rotation

Inactive Publication Date: 2007-05-16
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Considering these factors, the control of the rotation of the platter becomes unstable, and this unstable control produces jitter in the reproduced signal, thereby causing a problem of low performance

Method used

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Embodiment Construction

[0095]Embodiments of the present invention are described below with reference to the drawings. In the figures, parts with the same function are denoted by the same reference codes.

[0096] FIG. 1 is a block diagram of an optical disc apparatus having two laser sources of different wavelengths, and reproducing two or more types of discs of different densities, such as CD and SD.

[0097] As shown in FIG. 1, the optical disc device of the present invention has an optical system for projecting a light beam onto a disc 12 serving as an information carrier. The optical system includes a long-wavelength laser source 1, a coupling lens 5 that converts the output light of the light source 1 into parallel light, a short-wavelength laser source 2, a coupling lens 6 that converts the output light of the light source 2 into parallel light, and a wavelength-dependent A polarizer 7 , a polarizing beam splitter 8 , an exciter 9 , a converging lens 10 , a laser control circuit 3 for control...

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Abstract

An optical disk apparatus for reproducing information from plural types of information carriers or for recording information to plural types of information carriers, has two or more light sources with different wavelengths, a converging part for converging a light beam emitted from each of the light sources on said information carrier, a movement part for moving the converged spot of the light beam converged by the converging part in a direction substantially perpendicular to the surface of the information carrier, a convergence condition detection part for outputting a signal corresponding to the convergence condition of the light beam on the information carrier, an amplitude detection part for measuring the amplitude of the signal of the convergence condition detection part, and a focus control part for driving the movement part in accordance with the output signal of the convergence condition detection part and for performing control so that the convergence condition of the light beam on the information carrier becomes substantially constant.

Description

[0001] This application is a divisional application with an application date of June 1, 1998 and an application number of 98109542.9. technical field [0002] The present invention relates to an optical disc device, which is used for optically recording signals on an information carrier, and reproducing the recorded signals by light beams of light sources such as laser light. Background technique [0003] Optical disk devices for reproducing CD records and CD-ROMs generally use a laser light source with a wavelength of 780 nm. [0004] However, playback of high-density optical discs (compared with CDs, which have higher density and larger capacity, referred to as SD for short) uses a laser source with a wavelength of 650nm. [0005] A device has been proposed which has a long-wavelength laser of 780nm for CDs and a short-wavelength laser of 650nm for high-density disks. Therefore, a long-wavelength laser of 780nm is used for replaying CDs and CD-Rs, and a short-wavelength 65...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/00G11B7/09G11B7/085G11B19/12
CPCG11B7/08523G11B19/12G11B7/1275G11B7/1263G11B19/28G11B2220/2545G11B2019/121G11B2007/0006
Inventor 渡边克也山元猛晴岸本隆守屋充郎
Owner PANASONIC CORP
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