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:
Feb. 02, 1993
Filed:
Oct. 20, 1988
Applicant:
Inventors:
Kenjiro Kachi, Tsurugashima, JP;
Kazuo Noda, Yokohama, JP;
Assignee:
Nippon Conlux Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 4437 ; 369 4441 ;
Abstract
A method and an apparatus for recording and reproducing information comprising irradiating a light spot for recording and reproducing information and a plurality of light spots for tracking an information-recording region of an optical information-recording medium including tracks or guiding, projecting reflected beams from the optical information-recording medium due to said light spot for recording and reproducing information and plurality of light spots for tracking on a photosensor, and selecting two outputs from a plurality of electrical outputs for tracking from said photosensor to provide tracking-control signals.