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. 29, 1997
Filed:
Mar. 01, 1995
Masahiko Chaya, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A magneto-optical disk apparatus performs at least one of recording and reproduction of information with a magneto-optical recording medium having a disk shape. The magneto-optical disk apparatus comprises an optical device for irradiating the medium with a light beam and a first magnetic field applying device for applying a magnetic field modulated according to information to a portion on the medium which is irradiated with the light beam. The first magnetic field applying device comprises a magnetic head for generating a magnetic field and a floating-type slider for supporting the magnetic head. The apparatus further comprises a second magnetic field applying device, arranged parrallel to the first magnetic field applying device along a surface of the recording medium, for applying a constant magnetic field to the irradiated portion on the medium. The second magnetic field applying device comprises a core member of a substantial ring shape having a gap in a portion thereof and a coil wound around a portion of the core member. The core member has two ends located on either side of the medium such that the gap is positioned at the beam irradiated portion. The apparatus further comprises a moving device for moving the first and second magnetic field applying devices and the optical device together in a radial direction of the medium.