The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 14, 2010
Filed:
Feb. 09, 2005
Tetsuya Ogata, Kanagawa, JP;
Tetsuya Ogata, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
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.