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:
Jan. 04, 1983
Filed:
Apr. 02, 1981
Hitachi Denshi Kabushiki Kaisha, Tokyo, JP;
Hitachi, Ltd., both of, JP;
Abstract
A piezo-electric bimorph type transducer of a cantilever type for controlling the scan tracking of a magnetic tape by a rotating head in a helical-scan-type video tape recorder. In this transducer, piezo-electric thin plates which constitute a piezo-electric bimorph are formed in a different shape from the electrodes attached to the piezo-electric thin plates, and the width of the electrodes is smaller than the width of the piezo-electric thin plates in the direction from a fixed end of the transducer toward a movable end of the same, whereby in the bimorph element, a predetermined relationship is attained between the bending moment produced by a control voltage applied to the electrodes and the innertia generated in a dynamic condition, and the displacement of the magnetic head caused by the piezo-electric bimorph type transducer is in static and dynamic conformity, so that the tracking control is correctly carried out.