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:
Jan. 20, 1998
Filed:
Dec. 18, 1995
Kenji Uchiyama, Nagano, JP;
Hajime Utsunomiya, Nagano, JP;
Isamu Kuribayashi, Nagano, JP;
Masanori Kosuda, Nagano, JP;
Hiroyasu Inoue, Nagano, JP;
TDK Corporation, Tokyo, JP;
Abstract
A magneto-optical disc (1) includes a write/read magnetic layer (4) with high coercivity on a substrate (2) and an auxiliary magnetic layer (6) with low coercivity thereon in a magnetostatically coupled manner. Both the magnetic layers are recorded. Prior to or during reading, an external magnetic field of controlled strength is applied to initialize the auxiliary magnetic layer (6). The recorded magnetization information in the write/read magnetic layer (4) is read out by irradiating reading light from the side of write/read magnetic layer (4). Reading with improved C/N is possible.