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Optical data recording and reproducing apparatus and method and optical storage medium

An information processing device and information processing method technology, applied in the direction of optical recording/reproduction/erasing method, optical recording head, optical method recording/reproduction, etc., capable of solving the problem of low reflectivity in the amorphous state

Inactive Publication Date: 2004-03-03
VICTOR CO OF JAPAN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reflectivity of the amorphous state is low, such as figure 1 , so there is a problem in reading the laser beam reflected from the recording layer

Method used

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  • Optical data recording and reproducing apparatus and method and optical storage medium
  • Optical data recording and reproducing apparatus and method and optical storage medium
  • Optical data recording and reproducing apparatus and method and optical storage medium

Examples

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Embodiment Construction

[0022] Preferred embodiments according to the present invention are described with reference to the accompanying drawings.

[0023] exist image 3 In, information including software such as a movie is transmitted from the host station 2 to the user's optical information recording and reproducing apparatus 3 according to the present invention via satellite, telecommunication cable, or the like. This information is then supplied to a receiver 4, eg a modem.

[0024] If said information including video information has been compressed using a compression method, such as the EMEG2 method (Moving Picture experts Groups 2). The information also includes flag information Fd for copyright protection, which indicates the allowed number of times of reproduction, the period of permitted use, etc. during which the user can freely reproduce the video information.

[0025] The receiver 4 outputs the information 1 and transmits it to the first signal processor 5. The first signal processor ...

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PUM

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Abstract

A first laser beam and a second laser beam are selectively generated. The first or the second laser beam is irradiated on an optical storage medium having a recording layer on which main data has been recorded. The main data includes data to be reproduced and reproduction management data. The laser beam selection is made according to the reproduction management data. The first laser beam has a first laser power capable of carrying the main data without erasing when reflected from the optical storage medium. On the other hand, the second laser beam has a second laser power capable of erasing the main data from the optical storage medium while carrying the main data when reflected from the optical storage medium. The data to be reproduced and carried by the first or the second laser beam is then reproduced.

Description

technical field [0001] The present invention relates to an apparatus and method for recording and reproducing optical information, and an optical storage medium such as CD (Compact Disc) and DVD (Digital Video Disc, Digital Versatile Disc) for storing information, with which information is recorded and reproduced . Background technique [0002] Using phase change recording technology to record signals on optical storage media, such as PD and DVD-RAM, is to use a laser beam that is irradiated on each storage medium to change the state of the recording layer of the optical storage medium from An amorphous state changes to a crystalline state, or vice versa. [0003] Optical storage media of this phase-change recording type are in an amorphous state immediately after the recording layer is formed. The reflectivity of the amorphous state is low, such as figure 1 As shown, there is therefore a problem in reading the laser beam reflected from the recording layer. [0004] In o...

Claims

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Application Information

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IPC IPC(8): G11B20/12G11B7/00G11B7/0045G11B7/005G11B7/0055G11B7/125G11B7/127G11B20/00
CPCG11B20/00086G11B7/00557G11B7/127G11B7/0052G11B7/005
Inventor 长野博文江口秀治
Owner VICTOR CO OF JAPAN LTD
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