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:
Jul. 12, 2011
Filed:
Feb. 06, 2009
Keisuke Ohta, Mihara, JP;
Keisuke Ohta, Mihara, JP;
Sharp Kabushiki Kaisha, Osaka-shi, JP;
Abstract
An optical pickup apparatus, a reproducing apparatus, a recording apparatus, and a tracking error signal generation method are provided. Four light-receiving elements receive stray light of main and sub beams reflected from, out of a plurality of recording layers of the optical disk, the one other than that for effecting recording or reproduction. The four light-receiving elements are disposed individually near every side of the four-part split light-receiving element, of which light-receiving elements are disposed between the two-part split light-receiving elements. Based on stray-light intensity detected by the four light-receiving elements, intensity distribution is calculated for tracking-error signal correction.