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:
Feb. 22, 2011
Filed:
Feb. 21, 2008
Hiroshi Hasegawa, Kanagawa, JP;
Hiromichi Kobori, Kanagawa, JP;
Hiroshi Hasegawa, Kanagawa, JP;
Hiromichi Kobori, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A tracking control is performed based on a first tracking error signal obtained from a first light beam reflected on an optical recording medium and a second tracking error signal obtained from a second light beam reflected on the optical recording medium. The first tracking error signal is corrected when recording information to or reproducing information from a first information recording layer that includes a first area facing an area on a second information recording layer with no information recorded and a second area facing an area on the second information recording layer with information recorded.