Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1996-10-10
1999-05-04
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4427, G11B 709
Patent
active
059011220
ABSTRACT:
The present invention provides a focus servo circuit which can quickly and surely close the focus servo loop by discriminating fluctuation of initial position for starting the focus search operation generated by thickness of disc, surface deflection of disc and mechanical center position of objective lens or the like and then changing the focus search method depending on the result of discrimination.
REFERENCES:
patent: 5010538 (1991-04-01), Takeda et al.
patent: 5060215 (1991-10-01), Kawamura et al.
patent: 5202871 (1993-04-01), Yokota
patent: 5379282 (1995-01-01), Wachi
patent: 5642340 (1997-06-01), Nomura
Sony Corporation
Tran Thang V.
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