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:
Sep. 17, 1996
Filed:
Jun. 01, 1994
Makoto Shiho, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In a magnetooptical recording/reproducing apparatus, a beam spot is formed on a recording medium by radiating a laser beam from an optical head to the recording medium. In magnetic field modulation recording, a bias magnetic field is applied from a first bias magnetic field generation device onto a very small region where the beam spot is formed. In optical modulation recording, bias magnetic field is applied from a second bias magnetic field generation device to the very small region. The first bias magnetic field generation device is adapted to be evacuated from a position above the very small region by an evacuating mechanism. The second bias magnetic field generation device is adapted to be moved to the position above the very small region to be mechanically interlocked with the evacuating mechanism.