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:
Jun. 18, 1991
Filed:
Aug. 26, 1988
Applicant:
Inventors:
Toshihiro Komaki, Tokorozawa, JP;
Hideo Kudo, Tokorozawa, JP;
Tomonori Ishizuki, Tokorozawa, JP;
Shinichi Yokozeki, Tokorozawa, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369100 ; 369116 ;
Abstract
A method for recording and reproducing data on an optical disk of a phase-change type which is capable of being over-written, comprising steps of: writing the data by a writing light beam, erasing the written data by an erasing light beam, and reading the written data by a reading light beam, characterized by a step for initializing the optical disk so that a width of an initialized region is wider than the diameter of a spot written by the writing light beam on the optical disk.