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. 26, 1985
Filed:
Aug. 25, 1981
Tohru Musha, Tokyo, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
An objective lens drive device for driving an objective lens comprises an objective lens drive mechanism arranged at both sides of the objective lens for flanking the objective lens in the direction of displacement of the objective lens. The objective lens drive mechanism comprises an objective lens supporting mechanism at opposite sides of the objective lens and being bent perpendicularly to the optical axis of the objective lens and a data track and which displaceably support the objective lens in the perpendicular direction, movable magnetic bodies associated with respective lens supporting mechanisms at opposite sides of the objective lens and which move with the objective lens, first and second stationary yokes which flank the movable magnetic bodies perpendicularly to the direction of displacement, and first and second coils which are wound around the first and second stationary yokes, respectively for generating a magnetic field passing through the first and second stationary yokes and said movable members. The distribution of the magnetic field of said objective lens drive mechanism is made symmetrical about the optical axis of the objective lens and a current corresponding to a tracking error signal which represents the relative misalignment is supplied to said first and second coils of the respective objective lens drive mechanism.