Focus drive circuit and focus search method based on relative po

Details Focus drive circuit and focus search method based on relative po Focus drive circuit and focus search method based on relative po

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

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