Driving circuit for piezo-electric multimorph transducer

Details Driving circuit for piezo-electric multimorph transducer Driving circuit for piezo-electric multimorph transducer

1978-11-13

1980-12-02

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310332, H01L 4108

Patent

active

042373999

ABSTRACT:
A piezo-electric transducer, such as, a bi-morph leaf, comprised of a pair of piezo-electric elements which are oppositely poled in opposite directions and interposed between inner and outer electrodes with each element being bonded to the other at the respective inner electrodes, is provided with a drive circuit applying a drive voltage across the outer electrodes, one of which is desirably grounded, for deflecting the transducer, and which clamps the voltage at the bonded together inner electrodes to a relatively small maximum value at least in response to a polarity of the drive voltage opposed to the direction in which one of the piezo-electric elements is poled so as to avoid substantial depolarization of at least that one element. The foregoing arrangement is particularly desirable in an apparatus in which a magnetic head is moved along a track on a magnetic tape or other record medium for reproducing information signals recorded in such track which the bi-morph leaf supports the head for deflecting the latter in a direction transverse to that along the track in response to the drive voltage.

REFERENCES:
patent: 3054084 (1962-09-01), Parssinen et al.
patent: 3115588 (1963-12-01), Hueter et al.
patent: 3592967 (1971-07-01), Harris
patent: 3760203 (1973-09-01), Guntersdorfer et al.
patent: 3760203 (1973-09-01), Guntersdorfer et al.
patent: 3794410 (1974-02-01), Elliott
patent: 3794410 (1974-02-01), Elliott
patent: 3940974 (1976-03-01), Taylor
patent: 3955049 (1976-05-01), MacNeill
patent: 3971250 (1976-07-01), Taylor
patent: 4099211 (1978-07-01), Hathaway
patent: 4141048 (1979-02-01), Kubota

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