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:
Jun. 14, 1994
Filed:
Apr. 17, 1990
Harukazu Miyamoto, Kodaira, JP;
Yoshio Suzuki, Kodaira, JP;
Toshio Niihara, Sayama, JP;
Norio Ohta, Iruma, JP;
Masahiko Takahashi, Hachioji, JP;
Fumiyoshi Kirino, Tokyo, JP;
Yumiko Anzai, Tachikawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A magneto-optical recording device for radiating a laser beam according to recording information onto a magneto-optical recording medium having an easy axis of magnetization in a direction perpendicular to a film face of the recording medium itself to form a reversed domain and record information, which forms a reversed domain by radiating a laser beam and moves the position of the reversed domain to record information. In an embodiment of the present invention, it becomes possible to over-write new information without erasing beforehand information already recorded by only controlling the intensity, pulse width, radiation position and radiation time of the laser beam without providing a special bias magnetic field for reversing the magnetic field.