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. 03, 2013
Filed:
Aug. 12, 2010
Norihiro Tanabe, Kanagawa, JP;
Kimihiro Saito, Kanagawa, JP;
Norihiro Tanabe, Kanagawa, JP;
Kimihiro Saito, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
The present invention can properly correct spherical aberration. An optical disk device () displaces an objective lens () so that the objective lens is displaced to a reference lens position as a reference. The optical disk device () controls an information light condensing point changing mechanism () so as to adjust the focus (FM) of an information light beam (LM) to a recording depth (X) at which the information light beam (LM) is to be applied in a state of the objective lens () being placed at a reference lens position (SL). The optical disk device () controls a servo light condensing point changing mechanism () so as to adjust the focus (FS) of a servo light beam (LS) to a servo layer () in the state of the objective lens () being placed at the reference lens position (SL).