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, 1988
Filed:
Nov. 06, 1985
Yoshio Sato, Hitachi, JP;
Satoshai Shimada, Hitachi, JP;
Hiroshi Sasaki, Hitachi, JP;
Norifumi Miyamoto, Hitachi, JP;
Nobuyoshi Tsuboi, Ibaraki, JP;
Hideki Nihei, Hitachi, JP;
Ryuji Watanabe, Ibaraki, JP;
Atsumi Watanabe, Hitachi, JP;
Tetsuo Ito, Mito, JP;
Hiroaki Koyanagi, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention employs as a recording medium a metal or alloy which exhibits an intercrystalline transition before and after writing. In the present invention, two light beams of unequal wavelengths are used so as to write information with the light beam of the longer wavelength and to erase information with the light beam of the shorter wavelength. In changing a written content, a wavelength with which the reflection rate of the recording medium increases is used.