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. 23, 1991
Filed:
Jul. 21, 1988
Applicant:
Inventors:
Hiroya Ohkuma, Tokyo, JP;
Satoru Sanada, Yokohama, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 4432 ; 369 54 ;
Abstract
In an optical disc device, a plurality of heads provided with actuator means for inclining the direction of application of a beam applied to the surface of a disc within a predetermined range are secured onto a slider movable in the radial direction of the disc, and provision is made of detecting means for detecting the positions or the tracking errors of the beams of the plurality of heads, and slider control means for position-controlling the slider on the basis of the detection signal of the detecting means so that the directions of application of the beam spots by the actuator means are in a predetermined relation.