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:
May. 06, 1997
Filed:
Jun. 07, 1995
Haruhisa Iida, Yokohama, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A magnetooptical recording medium includes a substrate formed with a guide groove for tracking a laser beam, and first and second magnetic layers which are stacked on the substrate and each of which consists of an amorphous heavy rare earth-transition metal alloy. The first and second magnetic layers are magnetically coupled to each other. The first magnetic layer has a relatively high Curie temperature and a relatively low coercivity at room temperature, and the second magnetic layer has a relatively low Curie temperature and a relatively high coercivity at room temperature. The film thickness t.sub.1 of the first magnetic layer and the film thickness t.sub.2 of the second magnetic layer satisfy a condition t.sub.2 /t.sub.1 .gtoreq.2.5.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile