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:
Jan. 05, 1993
Filed:
Aug. 28, 1991
Yoshio Sato, Hitachi, JP;
Atsumi Watanabe, Yokohama, JP;
Satoshi Shimada, Hitachi, JP;
Hiroshi Sasaki, Hitachi, JP;
Nobuyoshi Tsuboi, Ibaraki, JP;
Hideki Nihei, Hitachi, JP;
Norifumi Miyamoto, Hitachi, JP;
Hiroaki Koyanagi, Hitachi, JP;
Hiroyuki Minemura, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An information recording and erasing method and apparatus of an optical memory medium including a substrate, a guard film, and an intermediate layer portion so disposed between said substrate and said guard film as to include at least a recording material layer having a phase changing with temperature and include at least one good conductor layer, comprising the steps of supplying magnetic flux varying relatively to said good conductor layer to generate eddy currents within said good conductor layer, and heating said recording material layer with heat generated in said good conductor due to the eddy current loss to effect information recording and erasing with respect to said recording material layer.