Focus searching method and optical disc device

Details Focus searching method and optical disc device Focus searching method and optical disc device

2007-07-24

2007-07-24

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044290, C369S053280

Reexamination Certificate

active

10799757

ABSTRACT:
A focus search driving voltage corresponding to a signal surface of an optical disc is obtained on the basis of detection information from a photodetector when an objective lens is focused on the signal surface of the optical disc in the middle of raising or lowering the objective lens placed on standby at a lens midpoint between a temporarily set lens bottom point and a temporarily set lens top point according to a temporarily set lens bottom point voltage and a temporarily set lens top point voltage. Then, a lens bottom point voltage and a lens top point voltage at the time of device starting are obtained by an arithmetic operation program based on the focus search driving voltage and predetermined factors, and then a lens bottom point corresponding to the lens bottom point voltage is set to be nearer to the lens midpoint side than the temporarily set lens bottom point while a lens top point corresponding to the lens top point voltage is set to be nearer to the lens midpoint side than the temporarily set lens top point.

REFERENCES:
patent: 5912867 (1999-06-01), Miyazono
patent: 2001/0026506 (2001-10-01), Shimamura et al.
patent: 2004/0081037 (2004-04-01), Jung et al.
patent: 2004/0130980 (2004-07-01), Kelbas et al.
patent: 0 315 470 (1989-05-01), None
patent: 0 840 304 (1998-05-01), None
patent: 1 408 488 (2004-04-01), None
patent: 1 460 618 (2004-09-01), None
patent: 03-165324 (1991-07-01), None
patent: 05-234093 (1993-09-01), None
patent: 05-250683 (1993-09-01), None
patent: 09-044982 (1997-02-01), None
patent: 09-204728 (1997-08-01), None
patent: 09-274765 (1997-10-01), None
patent: 2000-293932 (2000-10-01), None

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