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:
Jul. 29, 1997
Filed:
Mar. 05, 1996
Yoichi Osato, Yokohama, JP;
Katsumi Miyata, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A magnetooptical recording method for overwriting information on a magnetooptical recording medium, which has a first magnetic layer and a second magnetic layer having a larger coercive force and a lower Curie temperature than those of the first magnetic layer, comprises an initialization step of initializing magnetization of the first magnetic layer in one direction, a first recording step of radiating a light beam by repeating radiation and non-radiation states of the laser beam, while applying a bias magnetic field after the initialization step, a second recording step of continuously radiating a light beam while applying a bias magnetic field in a direction opposite to the one direction after the initialization step, and a step of selecting one of the first and second recording steps in accordance with recording information.