Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1996-08-09
1998-03-03
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313A, 310313D, 178 18, H01L 4108
Patent
active
057239347
ABSTRACT:
A surface acoustic wave position-sensing device comprising a piezoelectric substrate, a nonpiezoelectric plate, at least two surface acoustic 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, and a controlling system connected with the units X and Y. Each unit includes input and output interdigital transducers formed on the upper end surface of the piezoelectric substrate. One end surface of the nonpiezoelectric plate is mounted on the upper end surface of the piezoelectric substrate through the interdigital transducers. When an electric signal E.sub.T is applied to the input interdigital transducer, a surface acoustic wave is excited on an area, in contact with the input interdigital transducer, of the upper end surface of the piezoelectric substrate. The surface acoustic wave is transmitted to an area, in contact with the output interdigital transducer, of the upper end surface of the piezoelectric substrate, through the nonpiezoelectric plate, 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 n the upper end surface of the nonpiezoelectric plate, the surface acoustic 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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