Optical pickup device

Details Optical pickup device Optical pickup device

2007-07-24

2007-07-24

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044360, C369S044370

Reexamination Certificate

active

10128023

ABSTRACT:
According to the present invention, an optical pickup device forms one main spot, a first subspot, and a second subspot by irradiation of light on an optical disk having a groove part and a land part. The optical pickup device includes operation circuits which indicate a deviation between each of the optical spots and a track, and α detecting means for detecting such an α value that a difference in absolute value between SPP1and αSPP2falls in a preset range, where an AC amplitude of a push-pull signal of the first subspot is SPP1, and an AC amplitude of a push-pull signal of the second subspot is SPP2, wherein SPP1−αSPP2(α is a constant) is a land/groove discriminating signal. With this, in the optical pickup device for recording and reproducing information on/from the optical disk having a land/groove part, it is possible to generate a land/groove discriminating signal and a tracking error signal without an offset, thereby performing excellent tracking control.

REFERENCES:
patent: 5212675 (1993-05-01), Yoshino et al.
patent: 5428595 (1995-06-01), Yoshida et al.
patent: 5671199 (1997-09-01), Nishikawa
patent: 5875157 (1999-02-01), Sasaki et al.
patent: 6097684 (2000-08-01), Oohata et al.
patent: 6137758 (2000-10-01), Nemoto
patent: 6388963 (2002-05-01), Tanaka
patent: 6400664 (2002-06-01), Shimano et al.
patent: 6438077 (2002-08-01), Mashimo
patent: 6594210 (2003-07-01), Kumagai
patent: 6687201 (2004-02-01), Ma et al.
patent: 6700842 (2004-03-01), Nishi
patent: 6781930 (2004-08-01), Fukumoto
patent: 05-054415 (1993-03-01), None
patent: 05-128548 (1993-05-01), None
patent: 07-320287 (1995-12-01), None
patent: 09-081942 (1997-03-01), None
patent: 10-003672 (1998-01-01), None
patent: 11-045451 (1999-02-01), None
patent: 11-250475 (1999-09-01), None
Japanese Office Action dated Dec. 16, 2003.
English Translation of Japanese Office Action dated Dec. 16, 2003.

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