Bimorph electromechanical transducer and control circuit device

Details Bimorph electromechanical transducer and control circuit device Bimorph electromechanical transducer and control circuit device

1983-11-17

1986-06-10

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310332, H01L 4108

Patent

active

045945268

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.

REFERENCES:
patent: 4093885 (1978-06-01), Brown
patent: 4099211 (1978-07-01), Hathaway
patent: 4237399 (1980-12-01), Sakamoto

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