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:
Jun. 25, 1985
Filed:
Mar. 10, 1983
Peter J Vogelgesang, Roseville, MN (US);
Minnesota Mining & Manufacturing Company, St. Paul, MN (US);
Abstract
A driver for rotating a magnetic head affixed thereto having a housing, an armature rotably mounted within the housing, at least two field magnets within the housing and positioned around the axis of rotation for the armature, a driving coil and a concentrator for concentrating the magnetic flux from the field magnets so as to return the armature to a home position when no current is applied to the driving coil. The driver is affixed in the housing concentric with at least a portion of the armature such that a current passing through the driving coil develops a magnetic field polarizing the armature and causing a peripherential attraction of the armature toward an adjacent one of the field magnets and a corresponding repulsion of the armature from an adjacent other of the field magnets, thereby tending to rotate the armature a direction and distance proportional to the magnitude and polarity of the current.