Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-02-13
1999-10-26
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313R, H03H 976, H01L 41047
Patent
active
059734388
ABSTRACT:
An ultrasonic switching device comprising a piezoelectric substrate, an input- and an output interdigital transducers formed on an upper end surface of the piezoelectric substrate, and a nonpiezoelectric plate, a lower end surface of the nonpiezoelectric plate being cemented on the upper end surface of the piezoelectric substrate. The output interdigital transducer has a finger-overlap zone R.sub.i (i=1), or has N finger-overlap zones R.sub.i (i=1, 2, . . . , N) and N-1 finger-overlap zones Q.sub.i {i=1, 2, . . . , (N-1)} between two finger-overlap zones R.sub.i and R.sub.(i+1). Each finger-overlap zone R.sub.i comprises three zones R.sub.ia, R.sub.ib and R.sub.im. The finger direction of the zones R.sub.ia and R.sub.ib runs parallel with that of the input interdigital transducer. The finger direction of the zone R.sub.im is slanting to that of the input interdigital transducer by an angle .alpha.. The finger direction of the finger-overlap zone Q.sub.i is slanting to that of the input interdigital transducer by an angle .+-..beta.. The input- and output interdigital transducers form N pairs of ultrasound propagation lanes Z.sub.ia and Z.sub.ib (i=1, 2, . . . , N), on the upper end surface of the nonpiezoelectric plate. If an ultrasound on an ultrasound propagation lane Z.sub.xa attenuates by touching with a finger or others on the upper end surface of the nonpiezoelectric plate, an electric signal E.sub.xb corresponding to an ultrasound propagation lane Z.sub.xb is delivered at the output interdigital transducer.
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