Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2007-01-02
2007-01-02
Nguyen, Hoa T. (Department: 2653)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112230, C369S094000, C369S044230
Reexamination Certificate
active
09962301
ABSTRACT:
An optical system for an optical head of an optical disc drive is capable of using first and second discs, protective layer of the second disc being thicker than that of the first disc, a data density of the second disc being lower than that of the first disc. A light source selectively emits first and second laser beams having first and second wavelengths, respectively. An objective lens converges the first and second beams on the first and second discs, respectively. The second beam is incident on the objective lens as diverging light, and the first beam is incident on the objective lens as a beam of which degree of divergence is smaller. A diffraction lens structure is formed in the high NA exclusive area, which compensates for aberrations of a portion of the first laser beam, and causes aberrations to a portion of the second laser beam passed therethrough.
REFERENCES:
patent: 5446565 (1995-08-01), Komma et al.
patent: 5526336 (1996-06-01), Park et al.
patent: 5708641 (1998-01-01), Choi et al.
patent: 5933401 (1999-08-01), Lee et al.
patent: 6043912 (2000-03-01), Yoo et al.
patent: 6088322 (2000-07-01), Broome et al.
patent: 6115349 (2000-09-01), Tawa et al.
patent: 6118594 (2000-09-01), Maruyama
patent: 6134055 (2000-10-01), Koike
patent: 6366542 (2002-04-01), Kojima et al.
patent: 6552990 (2003-04-01), Kajiyama et al.
patent: 6574182 (2003-06-01), Yamada et al.
patent: 6791932 (2004-09-01), Maruyama
patent: 9197108 (1997-07-01), None
An English Language abstract of JP 9-197108.
Maruyama Koichi
Takeuchi Shuichi
Chu Kim-Kwok
Greenblum & Bernstein P.L.C.
Nguyen Hoa T.
PENTAX Corporation
LandOfFree
Optical system for 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 system for optical head, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical system for optical head will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3728346