CD device, CD recording method and compact discs

A technology of optical discs and equipment, applied in the field of optical disc access methods and optical discs, can solve the problems of long return time period, errors, unstable operation of optical pickups, etc., and achieve the effect of realizing accurate playback and avoiding harmful effects

CN100433138CInactive Publication Date: 2008-11-12SONY CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2008-11-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

An optical disk apparatus for recording information of copyright on an optical disk where desired data are recorded by repetition of pits or marks. The apparatus comprises a recording means for recording the copyright information by irradiating a laser beam onto the optical disk in such a manner as to repeatedly form, in a predetermined area of the optical disk, local regions which cause greater changes in the return-light receiving result as compared with the pits or marks. On the optical disk, the existence ratio of the local regions for recording the copyright information is set to be less than 0.3 in the circumferential direction of the disk. In a reproduction mode, the copyright information recorded like a bar code for example can be exactly reproduced with certainty.
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Description

technical field

[0001] The present invention relates to an optical disc device, an optical disc access method, and an optical disc, and more particularly to those suitable for application to a disc recording / reproducing device, an optical disc accessing method, and an optical disc, and the disc recording / reproducing device is for Designed for Mini Disc (MD), Compact Disc (CD), Digital Video Disc (DVD), etc. The present invention is conceived in such a way that when copyright information is recorded by repeatedly forming partial regions that cause a greater change in the return light receiving result than pits or marks, the existence of such partial regions in the circumferential direction of the optical disk The existence ratio is set to be less than 0.3 to ensure accurate playback of copyright information recorded like, for example, barcodes. Background technique

[0002] Recently, it has been noted that a compact disc device conventionally operated as an optical disc devi...

Examples

Embodiment Construction

[0028] Some preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] (1) Structure of the embodiment

[0030] figure 2 is a flowchart showing the optical disk manufacturing process in one embodiment of the present invention. In this embodiment, the optical disc manufacturing process 1 is used to manufacture the compact disc 2 containing the recorded copyright protection information ED.

[0031] The copyright protection information ED is used to encrypt audio data and the like to be recorded on the compact disc 2 and is also used to decrypt audio data and the like recorded on the compact disc 2 . For example, the copyright protection information ED is composed of ID information unique to each compact disc, information on the relevant manufacturer, information on the date of manufacture, and information controlling permission or prohibition of copying. In this embodiment, the copyright protection in...