Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-10-16
2007-10-16
Psitos, A M (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044110, C369S044410
Reexamination Certificate
active
10073061
ABSTRACT:
An optical recording/reproducing apparatus includes an optical pickup and a signal processor. The optical pickup includes an optical splitting device which splits light emitted from a first light source into a main light beam and sub-light beams which are symmetrical with respect to the main light beam and irradiates the split light beams on a recording medium, and a light detection device which receives the main light beam and the sub-light beams reflected by the recording medium, so as to detect a tracking error signal in a three-beam method and one of a push-pull method and an improved push-pull method. The signal processor receives the detection signals output by the light detection device and detects the tracking error signal in the three-beam method and one of the push-pull method and the improved push-pull method, and otherwise selectively detects the tracking error signal in one of the three-beam method, the push-pull method and the improved push-pull method, so as to realize an optimal tracking servo-control. Since a selective use of one of the improved push-pull method, the push-pull method and the three-beam method can be made according to the type of an optical disc, the optimal tracking servo-control can be realized regardless of the depth of a pit in an optical disc during a reproduction of data from the optical disc, such as a non-rewritable optical disc.
REFERENCES:
patent: 4918679 (1990-04-01), Opheij et al.
patent: 5239529 (1993-08-01), Tobita et al.
patent: 5708636 (1998-01-01), Takahashi et al.
patent: 5742575 (1998-04-01), Yamakawa et al.
patent: 5859819 (1999-01-01), Miyabe et al.
patent: 5892744 (1999-04-01), Ohba
patent: 5963515 (1999-10-01), Shindo
patent: 6088310 (2000-07-01), Yanagawa
patent: 6218655 (2001-04-01), Ogasawara et al.
patent: 6222803 (2001-04-01), Uemura et al.
patent: 6366543 (2002-04-01), Uemura et al.
patent: 6400664 (2002-06-01), Shimano et al.
patent: 6424609 (2002-07-01), Masakado
patent: 6560019 (2003-05-01), Nakai
patent: 6567355 (2003-05-01), Izumi et al.
patent: 6597642 (2003-07-01), Ijima et al.
patent: 6614720 (2003-09-01), Ogata et al.
patent: 6868055 (2005-03-01), Ueyama et al.
patent: 6891791 (2005-05-01), Gutin
patent: 7116612 (2006-10-01), Ogasawara et al.
patent: 64-50243 (1989-02-01), None
patent: 64-050243 (1989-02-01), None
patent: 07-065394 (1995-03-01), None
patent: 7-65394 (1995-03-01), None
patent: 07-320287 (1995-08-01), None
patent: 08-221774 (1996-08-01), None
patent: 8-221774 (1996-08-01), None
patent: 10-149564 (1998-02-01), None
patent: 10-149564 (1998-06-01), None
patent: 11-213405 (1999-08-01), None
patent: 2000-285482 (2000-10-01), None
patent: 2000-298871 (2000-10-01), None
patent: 2000-339718 (2000-12-01), None
patent: 2000-348367 (2000-12-01), None
patent: 1999-11987 (1999-02-01), None
MAT—(machine assisted translation) of JP 08-221774.
MAT (Machine assisted translation) of JP 07-320287.
MAT of JP 10-149564.
Hwang In-wook
Kim Kun-soo
Seong Pyong-yong
Psitos A M
Staas & Halsey , LLP
LandOfFree
Tracking error signal detecting method selectively using a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tracking error signal detecting method selectively using a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tracking error signal detecting method selectively using a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3899156