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:
Jun. 07, 1983
Filed:
Dec. 17, 1980
Toru Musha, Hachioji, JP;
Olympus Optical Co. Ltd., Tokyo, JP;
Abstract
An objective lens driving device for driving an objective lens and correcting a relative positional error, i.e. a tracking error between one or more information tracks recorded spirally or concentrically on a disc-shaped record medium and a light spot projected onto the record medium by means of the objective lens, comprising a supporting means for movably supporting the objective lens or its holding means in a direction perpendicular to an optical axis of the objective lens as well as the information track, first and second magnetic members arranged at both sides of the objective lens or its holding means as viewed in a direction perpendicular to the moving direction of the objective lens or its holding means and made integral therewith, first, second, third and fourth yokes each including one portion opposed through an air gap to one of the two ends of the magnetic member, first, second, third and fourth coils each wound around that portion of the yoke which is opposed to the magnetic member, and a magnetic field generation means for producing a closed loop of magnetic field passing through the first, second, third and fourth yokes as well as the first and second magnetic members.