Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2010-07-12
2011-10-11
Chow, Van N (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S044110
Reexamination Certificate
active
08036091
ABSTRACT:
An optical pick-up which permits the relative position of a diffracting optical element and a photodetector to be adjusted by feedback control with signals which are generated when more than one kind of diffracted light differing in order is received, the diffracted light occurring as the reflected light from the optical disc is divided and diffracted by the diffracting optical element having multiple regions. The photodetector which detects the light beam passing through the central region of the diffracting optical element and generates RF signals is juxtaposed with sub-photodetectors, so that they receive reflected stray light from out-of-focus layers and perform computation to calculate the reflected stray light component which the RF signal detector receives, thereby detecting only the component of signals of the reflected light from a target layer.
REFERENCES:
patent: 6185167 (2001-02-01), Arai et al.
patent: 7151735 (2006-12-01), Arai et al.
patent: 2008/0094948 (2008-04-01), Kamisada et al.
patent: 2009/0185471 (2009-07-01), Yamazaki
patent: 2010/0061202 (2010-03-01), Yamazaki et al.
patent: 2006-283248 (2006-10-01), None
patent: 2007-289894 (2007-11-01), None
patent: 2008-287851 (2008-11-01), None
patent: 2010-61751 (2010-03-01), None
Ide Tatsuro
Kimura Shigeharu
Tatsu Eriko
Yamazaki Kazuyoshi
Antonelli, Terry Stout & Kraus, LLP.
Chow Van N
Hitachi Media Electronics Co. Ltd.
LandOfFree
Optical pick-up and optical information recording and... 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 pick-up and optical information recording and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical pick-up and optical information recording and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4275974