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. 30, 1997
Filed:
Oct. 26, 1995
Applicant:
Inventors:
Hiroshi Hasegawa, Yokosuka, JP;
Hiromichi Kobori, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369116 ; 369 54 ; 369109 ; 3692754 ;
Abstract
An optical recording apparatus that rewrites recorded information on a modified constant angular velocity type phase change optical disk by overwriting using at least a recording light beam, erasing light beam and off-pulse light beam irradiation. The apparatus comprises a semiconductor laser for irradiating the optical disk with the light beam and a control unit for controlling the intensities P1, P2 and P3, wherein P1>P2>P3, of the light beam with which the optical disk is irradiated and their irradiation periods .tau.1 and .tau.3 to obtain a relation of