Optical pickup device recording and/or reproducing...

Details Optical pickup device recording and/or reproducing... Optical pickup device recording and/or reproducing...

2011-08-02

2011-08-02

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044370, C369S112010, C369S110030, C369S109020, C369S112050

Reexamination Certificate

active

07990834

ABSTRACT:
An optical pickup device has a semiconductor laser emitting light which is in turn branched via a diffraction grating into at least three beams of light including a main beam and two sub beams which are in turn condensed via an objective lens on an optical disk at a guide groove and reflected by the optical disk to provide three reflections of light which are in turn received by detectors, each divided into two regions, respectively, to generate a tracking error signal. The diffraction grating is divided into three regions including a first region, a second region and a third region located intermediate therebetween, each having a periodical structure out of phase, the periodical structure having grating grooves in a direction determined depending on the phase of the second region to incline relative to a direction perpendicular to the guide groove of the optical disk.

REFERENCES:
patent: 5483508 (1996-01-01), Miyake et al.
patent: 6721242 (2004-04-01), Ohnishi et al.
patent: 6728035 (2004-04-01), Takasuka et al.
patent: 7260033 (2007-08-01), Shimano et al.
patent: 2004/0081064 (2004-04-01), Ohnishi et al.
patent: 2004/0252620 (2004-12-01), Watanabe et al.
patent: 2005/0030877 (2005-02-01), Horiyama
patent: 2005/0122862 (2005-06-01), Shin et al.
patent: 2005/0276205 (2005-12-01), Heor et al.
patent: 2008/0253263 (2008-10-01), Komma
patent: 2009/0046554 (2009-02-01), Katayama
patent: 61-094246 (1986-05-01), None
patent: 09-081942 (1997-03-01), None
patent: 2004-145915 (2004-05-01), None
patent: 2005-004932 (2005-01-01), None

Affiliated with

Also associated with

Rating

Optical pickup device recording and/or reproducing... 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 pickup device recording and/or reproducing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical pickup device recording and/or reproducing... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2684861