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:
Apr. 21, 2009
Filed:
Feb. 16, 2006
Hiroyuki Kameda, Daito, JP;
Hiroyuki Kameda, Daito, JP;
Funai Electric Co., Ltd., Daito-shi, JP;
Abstract
An optical disc apparatus varies a tilt angle of an optical pickup from inward to outward of an optical disc, and stores a then obtained TE (Tracking Error) signal in a memory of a control circuit. The control circuit extracts amplitude values of the TE signal at tilt angles at predetermined angular intervals from the TE signal stored in the memory, and temporarily stores the extracted amplitude values in the memory, and further uses the stored amplitude values to determine a cubic curve to approximate the extracted amplitude values based on the least squares method. After determining the cubic curve, the control circuit sets a tilt angle corresponding to a maximum point of the cubic curve as an optimum tilt angle. This makes it possible to obtain a proper optimum tilt angle even with a surface-vibrating optical disc which much vibrates in the thickness direction during rotation.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile