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. 12, 1999
Filed:
Oct. 04, 1993
Applicant:
Inventors:
Takashi Naito, Kanagawa, JP;
Tamotsu Maeda, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ; G11B / ;
U.S. Cl.
CPC ...
369291 ; 369 13 ; 360133 ;
Abstract
A disk cartridge has an overwritable magneto-optical disk rotably mounted therein. The overwritable magneto-optical disk cartridge is usable in compatible type disk drives which also accept conventional, non-overwritable, magneto-optical disks. A magnetic initializing device is provided within the cartridge casing such that a sufficient magnetic field may be generated within the cartridge for effecting overwrite operations. Accordingly, no such magnetic initializing device need be provided in a disk drive and a size, weight and cost of such disk drives may be reduced, while cartridge performance may be reliably improved.