Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1997-03-06
1998-08-25
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313B, 310313D, 330193, 73632, H01L 4104
Patent
active
057985979
ABSTRACT:
A surface acoustic wave position-sensing device comprising a piezoelectric substrate, a nonpiezoelectric plate, two surface acoustic wave transducing units and a controlling system connected with the units. Each unit consists of interdigital transducers (IDTs). The thickness of the piezoelectric substrate is larger than three time an interdigital periodicity of the IDTs. The thickness of the nonpiezoelectric plate is smaller than the interdigital periodicity. Each of the IDTs is placed such that the finger direction thereof is slanting to that of the IDTs by an angle .alpha.. When an electric signal is applied to each of the IDTs a SAW is excited on an area, and transmitted to an area, in contact with the IDTs of the upper end surface of the piezoelectric substrate through the nonpiezoelectric plate. The controlling system senses a touch with a finger by the generation of the electric signal at one of the interdigital transducers.
REFERENCES:
patent: Re33151 (1990-01-01), Adler
patent: 4293734 (1981-10-01), Pepper, Jr.
patent: 5216312 (1993-06-01), Baer et al.
patent: 5343175 (1994-08-01), Davenport
patent: 5571944 (1996-11-01), Pfeifer et al.
patent: 5679998 (1997-10-01), Toda
Budd Mark O.
Williams Timothy A.
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