Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2005-11-22
2005-11-22
Patel, Gautam R. (Department: 2655)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044370, C369S121000
Reexamination Certificate
active
06967907
ABSTRACT:
An optical pickup device is adapted to read information signals from optical recording media of two different types such as a “DVD” and a “CD” for which two light beams with different wavelengths are used and comprises a photodetector having a single light receiving section that can be shared by optical recording media of two different types. Both the light beam reflected from the signal recording surface of the “DVD”106aand the light beam reflected from the signal recording surface of the “CD”106bare diffracted by the diffraction element6and focussed to a same spot on the light receiving surface of the photodiode of a photodetector7.
REFERENCES:
patent: 4935911 (1990-06-01), Ohuchida et al.
patent: 5085496 (1992-02-01), Yoshida et al.
patent: 5629919 (1997-05-01), Hayashi et al.
patent: 5953304 (1999-09-01), Dang et al.
patent: 6438075 (2002-08-01), Takeda et al.
patent: 6646975 (2003-11-01), Uchizaki et al.
Kananen Ronald P.
Patel Gautam R.
Rader & Fishman & Grauer, PLLC
LandOfFree
Optical pickup device and optical disk device having a... 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 and optical disk device having a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical pickup device and optical disk device having a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3507026