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. 01, 1997
Filed:
Nov. 02, 1995
Applicant:
Inventor:
Katsuya Oikawa, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 13 ; 369116 ; 360114 ;
Abstract
A magneto-optical disk is of a type in which magnetic record pits are formed by thermomagnetic recording on a magnetic member and the pits are read utilizing the photomagnetic effect. The disk has cellularly divided regions arranged along a track direction on both sides of an information track on which a signal pit string is formed. The divided regions have alternately changing directions of magnetization. The magneto-optical disk is magnetized such that a focused laser beam is irradiated on the disk and an alternating magnetic field is applied to a portion irradiated by the laser beam.