Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2006-12-28
2009-12-29
Pardo, Thuy N (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S044240, C369S120000
Reexamination Certificate
active
07639591
ABSTRACT:
A light detecting apparatus includes a first photodetector for receiving 0threflected light from a first information surface, a second photodetector proximate to the first photodetector for receiving the reflected light of a positive higher-order diffracted light from the first information surface, and a third photodetector proximate to the first photodetector for receiving the reflected light of a negative higher-order diffracted light from the first information surface. Light-receiving areas of the second and the third photodetectors include other-order light receiving areas that receive reflected light of the 0thorder light from a second information surface where the 0thorder light is not be focused, and wherein portions of the other-order light receiving areas of the second and the third photodetectors include light reception prohibited areas that prohibit the reception of the reflected light of the 0thorder light from the second information surface.
REFERENCES:
patent: 4533251 (1985-08-01), French et al.
patent: 5883872 (1999-03-01), Kino
patent: 6108283 (2000-08-01), Fujita et al.
patent: 6577584 (2003-06-01), Milster et al.
patent: 04-168631 (1992-06-01), None
Gunther John E.
Pardo Thuy N
Sanyo Electric Co,. Ltd.
Sanyo Optec Design Co., Ltd.
Sereboff Steven C.
LandOfFree
Photodetector and optical pickup 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 Photodetector and optical pickup apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photodetector and optical pickup apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4148389