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. 10, 1986
Filed:
Nov. 17, 1983
Shigeru Araki, Tokyo, JP;
Hideaki Kato, Tokyo, JP;
NEC Corporation, , JP;
Abstract
An electromechanical transducer comprising a bimorph and applicable, for example, to a helical scan type VTR for displacing a magnetic head into alignment with a magnetic track on a videotape, together with a control device for the electromechanical transducer. The bimorph is displaceabe at a free end portion thereof in response to a voltage applied thereacross. The control device comprises a sensor for sensing a displacement of the transducer, a drive circuit for driving the bimorph in response to externally derived drive signals which include a head position compensation drive signal, a feedback circuit for applying negative feedback to the drive circuit in response to a sensed displacement, and a low pass filter for cutting off high frequency components of the drive signal. The feedback circuit includes a high pass filter for reducing frequencies lower than first order resonance frequency.