Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-02-13
1999-07-20
Ramirez, Nestor
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
333154, H01L 4104
Patent
active
059259671
ABSTRACT:
An ultrasonic switching device comprises a piezoelectric substrate, and an input- and an output interdigital transducers formed on an 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 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.. 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, respectively. If an ultrasound on an ultrasound propagation lane Z.sub.Xa attenuates by touching with a finger or others on the upper- or a lower end surface of the piezoelectric substrate, an electric signal E.sub.Xb corresponding to an ultrasound propagation lane Z.sub.Xb is delivered at the output interdigital transducer. In the same way, if an ultrasound on the ultrasound propagation lane Z.sub.Xb attenuates, an electric signal E.sub.Xa corresponding to the ultrasound propagation lane Z.sub.Xa is delivered at the output interdigital transducer, the ultrasound propagation lanes Z.sub.Xa and E.sub.Xb making a pair.
REFERENCES:
patent: 5767608 (1998-06-01), Toda
patent: 5771206 (1998-06-01), Toda
patent: 5798597 (1998-08-01), Toda
patent: 5838088 (1998-11-01), Toda
patent: 5850118 (1998-12-01), Toda
Medley Peter
Ramirez Nestor
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