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:
Aug. 31, 1999
Filed:
Oct. 28, 1998
Applicant:
Inventors:
Assignee:
Hitachi, Ltd. and Hitachi Maxell, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 13 ; 369 14 ;
Abstract
An optical recording medium, optical recording method with use of it, and optical recording device for it comprise at least one magnetic layer on a substrate, the magnetic layer having a temperature Tco at which sizes of domains of the magnetic layer is sharply shrunk or expanded with temperature, thereby being capable of writing and reproducing high-density information formed of smaller domains than an optical spot diameter in a high signal quality.