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. 19, 1989
Filed:
Jul. 27, 1987
Hiromichi Kobori, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
To minimize the size and thickness of a magnetooptic head, a plurality of permanent magnets are arranged symmetrical with respect to the center of a condenser lens in such a way that the magnetic flux extends in both axial and radial directions of the condenser lens or that the same magnet poles are confronted each other. The axial magnetic flux is available for external magnetic field required for recording and erasing operations; while the radial magnetic flux is available for a magnetic field required for focusing and tracking operation is cooperation with focusing and tracking coils. In addition, part of the radial magnetic flux is available for lens position detection in cooperation with Hall elements to generate a lens position signal.