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:
Oct. 18, 1994
Filed:
Aug. 24, 1992
Yukinori Okazaki, Osaka, JP;
Mieko Kobukata, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In a magneto-optic memory device for recording information on a magneto-optic recording medium having a magneto-optic recording film irradiated by a first small diameter light spot and a second larger diameter light spot which is substantially concentric with the first light spot, the temperature of a portion of the recording film around a recording position is changed by the irradiation of the second light spot in accordance with an information signal to be recorded, between a temperature, which is lower than a compensation temperature of the recording film and produces spontaneous magnetization of the recording film having intensity necessary for recording information, and a temperature which is higher than the compensation temperature of the recording film and produces spontaneous magnetization of the recording film having intensity necessary for recording information, and the intensity of the first light spot is increased to raise the temperature of the recording position of the recording film so as to reach near the Curie temperature of the recording film, thereby erasing old information and recording new information at the same time.