Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-02-13
1999-11-30
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313D, H01L 4108
Patent
active
059948175
ABSTRACT:
An ultrasonic touch-position sensing device comprises a piezoelectric substrate, two ultrasonic transducing units formed on an upper end surface of the piezoelectric substrate, and a signal controller connected with the ultrasonic transducing units. Each ultrasonic transducing unit consists of 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 piezoelectric substrate, and 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. The input- and output interdigital transducers form N pairs of ultrasound propagation lanes Z.sub.ia and Z.sub.ib (i=1, 2, . . . , N), in the piezoelectric substrate, corresponding to the zones R.sub.ia and R.sub.ib, as well as to positions F.sub.ia and F.sub.ib (i=1, 2, . . . , N) on the upper- or a lower end surface of the piezoelectric substrate, respectively.
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patent: 5850118 (1998-12-01), Toda
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