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:
Aug. 17, 1993
Filed:
Oct. 03, 1988
Hiroya Ohkuma, Tokyo, JP;
Tomohisa Hasumi, Kawaguchi, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A magneto-optical disk apparatus in which a magneto-optical disk is loaded, data can be recorded on the magneto-optical disk, the data recorded on the magneto-optical disk can be reproduced and the data recorded on the magneto-optical disk can be erased includes a plurality of head devices for applying beams to the magneto-optical disk, the number of the head devices being an even number, a control device for controlling the plurality of head devices so that respective ones of the plurality of head devices apply beams to different ones of a plurality of annular areas on the magneto-optical disk, the number of the annular areas being the same as the number of the head devices, the control devices having a plurality of supporting devices for supporting each two of the plurality of head devices thereon, the two head devices supported on the plurality of supporting devices being supported so as to apply beams to two recording areas which are not adjacent to each other, and an applying device for applying a magnetic field to the plurality of annular areas, the applying device applying a magnetic field to the magneto-optical disk in a predetermined direction when the data is recorded on the magneto-optical disk, and changing the direction of the magnetic field applied to the magneto-optical disk to the direction opposite to the predetermined direction when the data recorded on the magneto-optical disk is erased.