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:
Sep. 04, 2012
Filed:
Oct. 25, 2007
Shinichi Yuzuki, Kanagawa, JP;
Tadaomi Takeshita, Kanagawa, JP;
Shinichi Yuzuki, Kanagawa, JP;
Tadaomi Takeshita, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Sony NEC Optiarc Inc., Tokyo, JP;
Abstract
The present invention can promptly start the tracking control. According to an embodiment of the present invention, after making it possible to discriminate the groove G and land L by the initial drive for the objective lens, the servo control and brake control are executed under an optimum condition when the objective lens is initially driven to the inner circumference direction to be outer eccentricity where a spot Pt is easily pulled in so as to pull in the spot Pt and start tracking control, and, in case the TR control error is raised when pulling in the spot Pt in an eccentricity speed minimum region ARfor the first time, assuming that the eccentricity speed minimum region ARis inner eccentricity, the spot Pt is pulled in at the next eccentricity speed minimum region ARin which the eccentricity direction becomes opposite and the tracking control is started.