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. 21, 1985
Filed:
Oct. 05, 1981
Applicant:
Inventor:
Tuneo Yanagida, Tokyo, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
428450 ; 360114 ; 360134 ; 360135 ; 360136 ; 427128 ; 427131 ; 427132 ; 428446 ; 428692 ; 428693 ; 428694 ; 428900 ; 428621 ; 428655 ; 428678 ; 428928 ;
Abstract
A recording medium comprises a first layer prepared from a material of perpendicular anisotropy, a second layer prepared from a compound of noncrystalline rare earth metal--3d transition metal and deposited on said first layer, and a transparent protective layer and mounted on said second layer. Data is magnetically recorded on the recording medium and the recorded data is optically read by utilizing the magneto-optics effects.