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Titolo:
Land/groove signal and differential push-pull signal detection for opticaldisks by an improved 3-beam method
Autore:
Katayama, R; Meguro, S; Komatsu, Y;
Indirizzi:
NEC Corp Ltd, Opt Recording Technol Dev Ctr, Miyamae Ku, Kawasaki, Kanagawa 2168555, Japan NEC Corp Ltd Kawasaki Kanagawa Japan 2168555 aki, Kanagawa 2168555, Japan
Titolo Testata:
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS
fascicolo: 3B, volume: 38, anno: 1999,
pagine: 1761 - 1767
SICI:
0021-4922(199903)38:3B<1761:LSADPS>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Keywords:
optical disk; land/groove recording; tracking servo; land/groove signal; differential push-pull signal; 3-beam method;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
6
Recensione:
Indirizzi per estratti:
Indirizzo: Katayama, R NEC Corp Ltd, Opt Recording Technol Dev Ctr, Miyamae Ku, 1-1 Miyazaki 4-chome, Kawasaki, Kanagawa 2168555, Japan NEC Corp Ltd 1-1 Miyazaki 4-chome Kawasaki Kanagawa Japan 2168555
Citazione:
R. Katayama et al., "Land/groove signal and differential push-pull signal detection for opticaldisks by an improved 3-beam method", JPN J A P 1, 38(3B), 1999, pp. 1761-1767

Abstract

In land/groove recording, it is necessary to detect both a land/groove signal and a differential push-pull signal for stabilization of the tracking servo. The former discriminates between land and groove during track pull-inoperation. while the latter compensates for offset of the tracking error signal due to shift of the objective lens. This paper proposes an improved 3-beam method for detecting both signals with thee same beam configuration. A 4-segment diffraction grating is employed, in which the grating patterns for two diagonal regions are pi/2 out of phase. A land/groove signal is obtained from sub-beam signals, while a differential push-pull signal is obtained from the difference between the main beam and sub beam signals. Features of this method are the applicability to disks with different track pitches and the:robustness against disk eccentricity. A land/groove signal was observed, and the compensation of the tracking error signal offset with shiftof the objective lens was confirmed experimentally. These results have demonstrated the validity of this method.

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Documento generato il 26/10/20 alle ore 07:24:58