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:
May. 28, 1991
Filed:
Sep. 25, 1989
William T Fearnside, Fishers, NY (US);
David M Orlicki, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
Apparatus for selectively reversing a magnetic bias field (e.g., to switch between recording and erasing modes in a magnetooptic recording system) includes a rod-shaped permanent magnet having its magnetic poles oriented along the cross-sectional dimension thereof. The rod is mounted for axial rotation within a concentrically arranged tube of electrically conductive material, and means are provided for biasing the rotational position of the magnet toward either of two nominal positions, 1/2.degree. apart. Upon being subjected to a torque, the magnet rotates toward either of its nominal positions, and oscillatory movement about such nominal positions is damped by eddy-current-produced magnetic forces in the conductive tube.