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1. US20040057359 - Optical disk device

Office
United States of America
Application Number 10658203
Application Date 10.09.2003
Publication Number 20040057359
Publication Date 25.03.2004
Publication Kind A1
IPC
G11B 15/52
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
15Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
18Driving; Starting; Stopping; Arrangements for control or regulation thereof
46Controlling, regulating, or indicating speed
52by using signals recorded on, or derived from, record carrier
G11B 5/09
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
02Recording, reproducing or erasing methods; Read, write or erase circuits therefor
09Digital recording
G11B 7/007
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
007Arrangement of the information on the record carrier, e.g. form of tracks
G11B 7/013
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
007Arrangement of the information on the record carrier, e.g. form of tracks
013for discrete information, i.e. where each information unit is stored in a distinct location
G11B 7/09
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
08Disposition or mounting of heads or light sources relatively to record carriers
09with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
G11B 11/00
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
11Recording on, or reproducing from, the same record carrier wherein for these two operations the methods or means are covered by different main groups of groups G11B3/-G11B7/212; Record carriers therefor
Applicants NEC CORPORATION
Inventors Iwanaga Toshiaki
Agents FOLEY AND LARDNER SUITE 500
Priority Data 1998262794 17.09.1998 JP
Title
(EN) Optical disk device
Abstract
(EN)

An optical disk provided with a land region and a groove region that are formed on a substrate, the land region and groove region being used as a recording track that is the medium of the recording/playback of information signal, and a pre-pit region that is formed at the boundary part of neighboring land region and groove region and is disposed every other boundary part, the pre-pit region including specific information. Characteristically, the specific information's in neighboring pre-pit regions are not aligned in the radius direction of the optical disk.