Surface acoustic wave device for sensing a touch-position

Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices

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Details

310313B, 310313D, 333193, 73 2404, H01L 4104

Patent

active

058380884

ABSTRACT:
A surface acoustic wave position-sensing device comprising two surface acoustic wave transducing units, a nonpiezoelectric plate and a controlling system connected with the units. Each unit consists of two piezoelectric substrates, a first group of interdigital transducers (IDTs) and a second group of interdigital transducers (IDTs). The second group of the IDTs is placed such that the finger direction thereof is slanting to that of the first group of the IDTs by an angle .alpha.. The thickness of each piezoelectric substrate is smaller than an interdigital periodicity of the IDTs. The thickness of the nonpiezoelectric plate is larger than three times the interdigital periodicity. When an electric signal is applied to the first group of the IDTs, a SAW is excited in one of the piezoelectric substrates and transmitted to the other of the piezoelectric substrates through the upper end surface of the nonpiezoelectric plate. The controlling system senses a touch with a finger on the upper end surface of the nonpiezoelectric plate by the generation of the electric signal at one of the second group IDTs.

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