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:
Mar. 09, 2010
Filed:
Feb. 28, 2007
Seiji Ono, Yokosuka, JP;
Naomitsu Kuroda, Yokohama, JP;
Eiji Okubo, Yokohama, JP;
Yasushi Horie, Tokyo, JP;
Seiji Ono, Yokosuka, JP;
Naomitsu Kuroda, Yokohama, JP;
Eiji Okubo, Yokohama, JP;
Yasushi Horie, Tokyo, JP;
Hitachi Media Electronics Co., Ltd., Iwate, JP;
Nidec Copal Corporation, Tokyo, JP;
Abstract
An optical element feeding device driving method and an optical disk apparatus capable of detecting biting in a stepping motor and conducting restoration. The optical disk apparatus includes an optical element feeding device including a movable frame for supporting a spherical aberration correcting lens to move the lens in optical axis direction, a spring for applying force to the frame in the direction, a sensor for detecting a lens reference position, a stepping motor, and a lead screw and a nut for converting motor rotation into the direction, a motor driving circuit, a decision circuit for judging abnormality when an output of the sensor does not change even if the driving circuit outputs a driving signal to the motor after reference position detection, and a changeover circuit for lowering a driving frequency than in ordinary operation, based on an abnormality signal.