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:
Apr. 27, 1993
Filed:
Aug. 09, 1991
Applicant:
Inventor:
Yuwa Ishii, Kawasaki, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ; G11B / ; G11B / ;
U.S. Cl.
CPC ...
369 13 ; 360 59 ; 360114 ; 360135 ; 360137 ; 369292 ;
Abstract
A magnetooptic recording medium cartridge which accommodates a double face type disk-like magnetooptic recording medium with which an overwriting can be performed by modulating only the intensity of a laser beam in accordance with two-valued information to be recorded, without modulating a recording magnetic field. The cartridge has two initial auxiliary magnetic field (Hini.) applying devices adapted to produce magnetic fields directed opposite to each other.