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:
Dec. 28, 1993
Filed:
Aug. 05, 1991
Applicant:
Inventors:
Yoshio Sato, Hitachi, JP;
Nobuyoshi Tsuboi, Naka, JP;
Hiroyuki Minemura, Hitachi, JP;
Hisashi Andoh, Hitachi, JP;
Masaichi Nagai, Hitachi, JP;
Isao Ikuta, Iwaki, JP;
Yoshimi Kato, Takahagi, JP;
Yoshihito Maeda, Mito, JP;
Tatsuya Sugita, Hitachi, JP;
Yutaka Sugita, Tokorozawa, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 13 ; 3692755 ; 369291 ;
Abstract
The information processor uses a portable memory which is able to be overwritten by laser power modulation system. The memory includes a disk type recording medium incorporated rotatably in a thin case, and carries out write/read/erase by means of a first magnetic field application device, a second magnetic field application device, and an optical head radiating light through this case.