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:
Sep. 02, 2014
Filed:
Aug. 14, 2013
Sony Corporation, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
There is provided an optical pickup including a light source, an objective lens configured to focus light from the light source onto one signal face of an optical disc, the optical disc including two or more signal faces, each of the signal faces having a groove formed therein, a photodetector configured to receive returning rays from the optical disc, the photodetector having a light receiving face divided into four light receiving regions by a dividing line that is substantially parallel to a track direction of the optical disc and by a dividing line that is substantially perpendicular to the track direction, and a shading unit disposed at an incident side of the photodetector and configured to block, of returning rays from a signal face other than the one signal face of the optical disc, at least a diffracted ray that is diffracted by the groove.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile