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:
Jan. 30, 2009
Hirotaka Miyamoto, Kanagawa, JP;
Kimihiro Saito, Saitama, JP;
Toshihiro Horigome, Kanagawa, JP;
Kunihiko Hayashi, Kanagawa, JP;
Hirotaka Miyamoto, Kanagawa, JP;
Kimihiro Saito, Saitama, JP;
Toshihiro Horigome, Kanagawa, JP;
Kunihiko Hayashi, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A focus control section first performs a reference focus control process in which a reference optical beam is focused on a reference layer of an optical disc according to the result of receiving a reference reflection optical beam, and then switches from the reference focus control process to an information focus control process in which an information optical beam is focused on a mark layer of the optical disc according to the result of receiving an information reflection optical beam.