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:
Oct. 28, 1997
Filed:
May. 06, 1996
Applicant:
Inventors:
Nobuaki Onagi, Tsurugashima, JP;
Nobuyasu Negishi, Tsurugashima, JP;
Takamasa Yoshikawa, Tsurugashima, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo-to, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428 643 ; 4286 / ; 4286 / ; 4286 / ; 4286 / ; 4286 / ; 4286 / ; 428611 ; 428615 ; 428621 ; 428635 ; 428668 ; 428670 ; 428900 ; 3692752 ; 3692753 ; 365122 ; 360 59 ; 360114 ;
Abstract
A magneto optical disc, is provided with: a record layer to which information is recorded in a perpendicular magnetization condition; a switch layer, which perpendicular magnetic anisotropy is reduced at a room temperature and is increased at a temperature close to a predetermined reproduction temperature; and a reproduction layer opposed to the record layer through the switch layer to have a switched connection with the record layer by the switch layer.