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:
Nov. 30, 2010
Filed:
Sep. 17, 2007
Masatoshi Nishino, Chiba, JP;
Masatoshi Nishino, Chiba, JP;
Sony NEC Optiarc Inc., Tokyo, JP;
Abstract
An optical recording medium driving device includes an optical head, an evaluation signal generating section, a focus servo section, a spherical aberration correction section, a focus bias adjuster, and a system controller. The optical head has a focus servo mechanism and a spherical aberration correction mechanism, irradiates a laser light, and detects a reflected light. The evaluation signal generating section generates, based on the reflected light, an evaluation signal. The focus servo section drives the focus servo mechanism according to a focus error signal to perform focus servo. The spherical aberration correction section drives the spherical aberration correction mechanism to perform spherical aberration correction. The focus bias adjuster adds focus bias to a focus loop. The system controller performs an operation for setting an adjustment spherical aberration correction value.