Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1997-03-06
1998-06-16
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313B, 310313C, H01L 4104
Patent
active
057676046
ABSTRACT:
An elastic wave position-sensing device comprising two elastic wave transducing units X and Y, a nonpiezoelectric plate, and a controlling system connected with the units X and Y. Each unit consists of a piezoelectric substrates P.sub.T and P.sub.R, interdigital transducers T.sub.0 and T.sub.i (i=1, 2, . . . , N) formed on one end surface of the piezoelectric substrate P.sub.T, interdigital transducers R.sub.0, R.sub.i1 and R.sub.i2 (i=1, 2, . . . , N) placed on one end surface of the piezoelectric substrate P.sub.R. Each of the interdigital transducers R.sub.i1 and R.sub.i2 is placed such that the finger direction thereof is slanting to that of the interdigital transducer T.sub.i by an angle .alpha.. The thickness d of the piezoelectric substrates P.sub.T and P.sub.R is smaller than an interdigital periodicity P of the interdigital transducers T.sub.0, T.sub.i and R.sub.0. The thickness of the nonpiezoelectric plate is smaller than two times the thickness d, the piezoelectric substrates P.sub.T and P.sub.R being mounted on one end surface of the nonpiezoelectric plate. A part, adjacent to the piezoelectric substrate P.sub.T, of the nonpiezoelectric plate, and the piezoelectric substrate P.sub.T form a bilayer zone B.sub.T. A part, adjacent to the piezoelectric substrate P.sub.R, of the nonpiezoelectric plate, and the piezoelectric substrate P.sub.R form a bilayer zone B.sub.R. When an electric signal is applied to each of the interdigital transducers T.sub.0 and T.sub.i, an elastic wave is excited in the bilayer zone B.sub.T, and transmitted to the bilayer zone B.sub.R through the monolayer zone between the bilayer zones B.sub.T and B.sub.R.
REFERENCES:
patent: Re33151 (1990-01-01), Adler
patent: 4203082 (1980-05-01), Tsukamoto et al.
patent: 4293734 (1981-10-01), Pepper, Jr.
patent: 5591945 (1997-01-01), Kent
patent: 5679998 (1997-10-01), Toda
Budd Mark O.
Williams Timothy A.
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