Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1996-04-23
1999-01-12
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4423, 369 4426, G11B 709
Patent
active
058598197
ABSTRACT:
An optical disk apparatus comprising an optical element for dividing the reflected light into a plurality of light beams for generating a tracking error signal and a focus error signal, and deflecting these light beams into different directions from each other, a first calculating means for calculating the focus error signal on the basis of outputs from said photodetecting means, and a second calculating means for calculating the tracking error signal on the basis of the outputs from said photodetecting means in accordance with a structure of a track. The second calculating means outputs a tracking error signal by a push-pull method when a track has a successive groove. The second calculating means outputs a tracking error signal by a heterodyne method when a track has only a row of pits.
REFERENCES:
patent: 5161139 (1992-11-01), Inoue et al.
patent: 5491675 (1996-02-01), Kay
patent: 5559767 (1996-09-01), Matsui
patent: 5619482 (1997-04-01), Tezuka et al.
patent: 5623462 (1997-04-01), Tezuka et al.
patent: 5671199 (1997-09-01), Nishikawa
Hamaguchi Shingo
Miyabe Kyoko
Tezuka Koichi
Fujitsu Limited
Tran Thang V.
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