Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1995-10-06
1999-12-07
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4436, 369 4429, 369 4435, 369 4427, G11B 7095
Patent
active
059995025
ABSTRACT:
In an optical information recording-reproduction apparatus, a focus servo control circuit generates a focus error signal and a light beam is accurately converged on a surface of an optical disk according to a focus servo control signal based upon the focus error signal. In accordance with the present invention, the focus error signal is compensated by selecting a land section focus offset amount by a switch when land sections are tracked, and it is compensated by selecting a groove section focus offset amount when groove sections are tracked. As a result, since the land sections and the groove sections are controlled by different focus servo control signals, recording and reproducing operations are carried out at the most optimal focusing positions respectively obtainable, thereby making it possible to significantly improve the quality of a reproduced signal.
REFERENCES:
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patent: 5109367 (1992-04-01), Yoshikawa
patent: 5138594 (1992-08-01), Fennema
patent: 5297114 (1994-03-01), Itoh
patent: 5475664 (1995-12-01), Shimizume
patent: 5493552 (1996-02-01), Kobori
patent: 5568461 (1996-10-01), Nishiuchi
Kojima Kunio
Nakata Yasuo
Ogata Nobuo
Sato Hideaki
Faber Alan
Sharp Kabushiki Kaisha
Young W. R.
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