Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-02-13
1999-12-21
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313D, H01L 4108
Patent
active
060053275
ABSTRACT:
An ultrasonic touch-position sensing device comprises a nonpiezoelectric plate, two ultrasonic transducing units mounted on an upper- or a lower end surface of the nonpiezoelectric plate, and a signal controller connected with the ultrasonic transducing units. Each ultrasonic transducing unit consists of a first- and a second piezoelectric substrates, at least an input interdigital transducer and at least an output interdigital transducer. The output interdigital transducer has at least a finger-overlap zone R.sub.i (i=1). The finger-overlap zone R.sub.i comprises 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. When an electric signal is applied to the input interdigital transducer, an ultrasound is excited in the bilayer zone B.sub.T composed of the first piezoelectric substrate and the nonpiezoelectric plate, and transmitted to the bilayer zone B.sub.R, composed of the second piezoelectric substrate and the nonpiezoelectric plate, through the monolayer zone between the bilayer zones B.sub.T and B.sub.R. The ultrasound is transduced to electric signals E.sub.ia and E.sub.ib (i=1, 2, . . . , N) at the zones R.sub.ia and R.sub.ib, respectively.
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