Optical head and optical disk apparatus

Details Optical head and optical disk apparatus Optical head and optical disk apparatus

2006-06-27

2006-06-27

Patel, Gautam R. (Department: 2656)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044410, C369S044230, C369S112120, C369S112020

Reexamination Certificate

active

07068572

ABSTRACT:
To stably carry out recording and reproducing to and from a high density optical disk without using a double servo in the optical disk using a high NA objective lens. A detection of a spherical aberration and a detection of a coma aberration in a radial direction are simultaneously performed, and the coma aberration generated with the offset of an objective lens109is corrected in real time, thus enlarging an allowable offset amount of the objective lens. In order to simultaneously detect the spherical aberration and the coma aberration, focal shift and tracking shift signals in an inside region and outside region of reflected light flux are detected respectively, and the differential signals are set as spherical aberration and coma aberration signals.

REFERENCES:
patent: 5708638 (1998-01-01), Braat et al.
patent: 6185167 (2001-02-01), Arai et al.
patent: 6229600 (2001-05-01), Martynov
patent: 6399932 (2002-06-01), Wals
patent: 6496452 (2002-12-01), Stallinga et al.
patent: 6498330 (2002-12-01), Yoshida
patent: 6785209 (2004-08-01), Chung et al.
patent: 6807133 (2004-10-01), Ariyoshi et al.
patent: 1308326 (2001-08-01), None
patent: 200011402 (2000-01-01), None
patent: WO 9918466 (1999-04-01), None

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3676603