Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1976-11-02
1981-01-13
Blum, Theodore M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
367157, 310334, H01L 4108
Patent
active
042451728
ABSTRACT:
An improved transducer for generating and detecting shear waves using pielectric bimorph elements. A plurality of pairs of bimorph elements are formed by rigidly attaching together two individual lengths of piezoelectric material with each dimensioned to provide a length and width substantially greater than its thickness. The plurality of bimorph pairs are mounted in a configuration such that each pair is separated by a layer of high compliance material with the electrical polarization of each piezoelectric element pointing in the same direction. Electrical potential applied simultaneously to the electrodes of the individual pairs causes the entire end face of the transducer to perform a shearing motion which will generate or detect acoustic waves in materials in contact with the face.
REFERENCES:
patent: 2640165 (1953-05-01), Howatt
patent: 3054084 (1962-09-01), Parssinen et al.
patent: 3399314 (1968-08-01), Phillips
patent: 3421137 (1969-01-01), Rathbun, Jr.
Blum Theodore M.
Collignon Paul S.
Sciascia R. S.
The United States of America as represented by the Secretary of
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