Optical head

Details Optical head Optical head

2005-08-23

2005-08-23

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044410

Reexamination Certificate

active

06934228

ABSTRACT:
An optical head having a semiconductor laser and a generation of a plurality of reflected light beams from an optical disk which have polarities of intensity distribution variations which are substantially inverted to each other when a periodic structure of the optical disk crosses at least one focused spot on the disk. An optical detection system splits the plurality of reflected light beams and detects the split reflected light beams. An electrical circuit provides a focus error signal of the at least one focused spot and a tracking error signal from the plurality of reflected light beams. The electrical circuit adds focus error signals provides a difference signal between the focus error signals, amplifies tracking error signals with a gain, and obtains a difference between amplified tracking error.

REFERENCES:
patent: 4742218 (1988-05-01), Nakamura et al.
patent: 4750162 (1988-06-01), Tajima
patent: 4812638 (1989-03-01), Ogata et al.
patent: 4970710 (1990-11-01), Lee
patent: 5005163 (1991-04-01), Yamamoto et al.
patent: 5084849 (1992-01-01), Ishii et al.
patent: 5173598 (1992-12-01), Bakx
patent: 5408452 (1995-04-01), Sakemoto et al.
patent: 5440536 (1995-08-01), Ito et al.
patent: 5502708 (1996-03-01), Morimoto
patent: 5579298 (1996-11-01), Opheiji et al.
patent: 5610883 (1997-03-01), Yanagawa
patent: 5629911 (1997-05-01), Sasaki
patent: 5719839 (1998-02-01), Naito
patent: 5815473 (1998-09-01), Takahashi et al.
patent: 5828634 (1998-10-01), Ohno et al.
patent: 5859819 (1999-01-01), Miyabe et al.
patent: 5886964 (1999-03-01), Fujita
patent: 5930220 (1999-07-01), Shimano et al.
patent: 6011762 (2000-01-01), Watanabe et al.
patent: 6027594 (2000-02-01), Nishiuchi et al.
patent: 6084835 (2000-07-01), Buchler et al.
patent: 6104689 (2000-08-01), Noguchi
patent: 6125087 (2000-09-01), Ohnishi et al.
patent: 0 762 396 (1997-03-01), None
patent: 2-96618 (1990-04-01), None
patent: 4-168631 (1992-06-01), None
patent: 5-68774 (1993-03-01), None
patent: 5-128548 (1993-05-01), None
patent: 5-197980 (1993-08-01), None
patent: 6-68496 (1994-03-01), None
patent: 6-162527 (1994-06-01), None
patent: 6-309687 (1994-11-01), None
patent: 7-225963 (1995-08-01), None
patent: 8-279166 (1996-10-01), None
patent: 9-16972 (1997-01-01), None
patent: 10-3672 (1998-01-01), None
Journal of Optical Society of America, 1979, vol. 69, No. 1, pp. 4-24.
Technical Digest of Symposium on Optical Memory '86, 1986, pp. 127-132.
National Technical Report, vol. 40, No. 6, 1994, pp. 771-778.
Fundamentals and Applications of Optical Disk Storage, Y. Tsunoda, 1995, 1st Edition, Korona Corp., Tokyo, pp. 78-92.

Affiliated with

Also associated with

Rating

Optical head does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical head, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical head will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3482272