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:
Sep. 22, 1987
Filed:
Jan. 26, 1984
Applicant:
Inventor:
Shigeru Aoi, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
369 46 ; 369 44 ;
Abstract
An optical information recording-reproducing apparatus in which a primary beam is applied to a recording medium and information is recorded and reproduced by the same primary beam while, at the same time, at least two secondary beams are applied to the recording medium and the lights of the secondary beams from the recording medium are detected to thereby obtain the position information of the primary beam on the recording medium has a device for varying the relative position of the primary beam and the secondary beams on the recording medium during recording of information and during reproduction of information.