Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2005-02-09
2010-12-14
Miller, Brian E (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
Reexamination Certificate
active
07852733
ABSTRACT:
An optical pickup apparatus for shining light on and detecting reflected light from an optical disk having two recording layers. The apparatus includes a light source, an optical system situated on a path of a light beam returning from the optical disk, the optical system including a light condensing optical unit, a light beam regulating unit, and one or more photo detectors, situated between a position where the light reflected by the first recording layer contained in the partial light beam is condensed and a position where the light reflected by the second recording layer contained in the partial light beam is condensed, the one or more photo detectors having a first photo detecting section to detect the light reflected by the first recording layer and a second photo detecting section to detect the light reflected by the second recording layer.
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Dickstein & Shapiro LLP
Fischer Mark L
Miller Brian E
Ricoh & Company, Ltd.
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