Optical disk drive and pickup device

Details Optical disk drive and pickup device Optical disk drive and pickup device

2007-06-18

2010-11-09

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053200

Reexamination Certificate

active

07830758

ABSTRACT:
An optical disk drive includes focusing means, moving means for moving the focusing means in a direction perpendicular to a track direction, light detection means having a first light acceptance section accepting a light beam reflected by one information recording layer and a second light acceptance section accepting stray light reflected by another information recording layer, tracking error signal generating means for generating and correcting the tracking error signal using an output of the second light acceptance section, and tracking control means, wherein the second light acceptance section is composed of a disk inner area and a disk outer area, and where the stray light is accepted without accepting the light beam, and the tracking control means removes an offset caused by the stray light using a difference between the output of the disk inner area and the output of the disk outer area.

REFERENCES:
patent: 6091690 (2000-07-01), Sano et al.
patent: 7142489 (2006-11-01), Nishiwaki et al.
patent: 7428201 (2008-09-01), Nakao et al.
patent: 2007/0189130 (2007-08-01), Anzai et al.
patent: 2007/0189141 (2007-08-01), Okamatsu
patent: 2008/0084804 (2008-04-01), Ishii
patent: 3438160 (2003-06-01), None
patent: 2004-281026 (2004-10-01), None

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