Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1996-08-09
1997-10-21
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313D, 333193, 73632, H01L 4108
Patent
active
056799985
ABSTRACT:
An elastic wave position-sensing device comprising at least two elastic wave transducing units X and Y having N propagation lanes U.sub.Xi, (i=1, 2, . . . , N) and U.sub.Yi (i=1, 2, . . . , N), respectively, a nonpiezoelectric plate, a display panel mounted on one end surface of the nonpiezoelectric plate, and a controlling system connected with the units X and Y. Each unit includes a piezoelectric substrate P.sub.T, a piezoelectric substrate P.sub.R, at least an input interdigital transducer formed on one end surface of the piezoelectric substrate P.sub.T, and at least an output interdigital transducer formed on one end surface of the piezoelectric substrate P.sub.R. Each piezoelectric substrates mounted on one or the other end surface of the nonpiezoelectric plate and the nonpiezoelectric plate form N bilayer zones L.sub.Ti (i=1, 2, . . . , N), a bilayer zone L.sub.R, and a monolayer zone between the bilayer zones L.sub.Ti and the bilayer zone L.sub.R. When an electric signal E.sub.T is applied to the input interdigital transducer, an elastic wave is excited in the bilayer zone L.sub.Ti. The elastic wave is transmitted to the bilayer zone L.sub.R through the monolayer zone, and is transduced to an electric signal E.sub.R. If touching a crossing point of the lanes U.sub.Xi and U.sub.Yi on the other end surface of the nonpiezoelectric plate, the elastic wave is intercepted at the crossing point. Therefore, the magnitude of the electric signal E.sub.R corresponding to the crossing point decrease or disappearance. Thus, it is possible to specify the crossing point.
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