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. 25, 2000
Filed:
Aug. 26, 1997
Keiji Nishikiori, Daito, JP;
Kiyoshi Uchida, Yamatotakada, JP;
Motoyoshi Murakami, Hirakata, JP;
Masahiro Birukawa, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A magneto-optical recording medium includes at least a readout magnetic film and a recording magnetic film on a substrate, wherein information is recorded onto the recording magnetic film through magnetization of the recording magnetic film thereby forming domains therein, by a heating caused by irradiation of a recording light and application of a recording magnetic field, and the recorded information is read out through irradiation of a readout light thereby copying magnetization of the domains in the recording magnetic film to the readout magnetic film. The recording magnetic film is a perpendicular magnetic film in which the formed domains are retained The readout magnetic film Is a perpendicular magnetic film having a magnetic characteristic in which domains formed therein shrink The readout magnetic film contains no domains formed therein at a timing except for a readout operation to have a unidirectional magnetization.