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. 05, 1991
Filed:
Oct. 25, 1989
Applicant:
Inventors:
Katsumi Mizunoe, Yokohama, JP;
Hisharu Kaneko, Yokohama, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; H01S / ;
U.S. Cl.
CPC ...
369116 ; 372 29 ; 346 / ; 369 33 ;
Abstract
An optical disk apparatus effect recording reproduction and erasure of information by irradiation with laser beams on an optical disk. In the optical disk apparatus, a plurality of beam heads are correspondingly provided for respective recording regions defined by radially dividing a recording zone on the optical disk.