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. 10, 2007
Filed:
May. 30, 2003
Optical head device for an optical disk apparatus reading and writing information on an optical disk
Noriyuki Kawano, Tokyo, JP;
Nobuo Uekusa, Tokyo, JP;
Noriyuki Kawano, Tokyo, JP;
Nobuo Uekusa, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
An optical head device for an optical disk apparatus for optically reading and writing information by irradiating a light spot onto an information recording surface of an optical recording medium, which is capable of moving an objective lens to a predetermined position even when part of the drive coil is included in an neutral area n in the vicinity of the magnetic boundary. There are provided two driving force generating units, including two magnetsanddisposed in the tangential direction of an optical disk separately on the opposite sides of an objective lens, and coil unitsandfor generating the driving force directed against the magnetsanddisposed on a lens holder, and the magnetsandand the coil unitsandare arranged in such a manner that the driving force other than the driving force generated for tracking movement and the moment act against each other at the two driving force generating units.