Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1997-05-05
1998-12-15
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313B, H01L 4108
Patent
active
058501185
ABSTRACT:
An ultrasonic touch-position sensing device comprising a piezoelectric substrate, two surface acoustic wave transducing units X and Y, and a controlling system connected with the units X and Y. The unit X includes interdigital transducers T.sub.X and R.sub.X, and the unit Y includes interdigital transducers T.sub.Y and R.sub.Y on the upper end surface of the substrate. When an electric signal is applied to each of the interdigital transducers T.sub.X and T.sub.Y, a surface acoustic wave is excited on the upper end surface of the substrate. The surface acoustic wave excited by the interdigital transducer T.sub.X and that excited by the interdigital transducer T.sub.Y are transduced to electric signals E.sub.Xi (i=x, . . . , 2, 1, 0, -1, -2, . . . , -x) and E.sub.Yj (j=y, . . . , 2, 1, 0, -1, -2, . . . , -y), respectively. If touching a crossing point made from the position F.sub.Xx and F.sub.Yy, the electric signals E.sub.X-x and E.sub.Y-y are delivered from the interdigital transducers R.sub.X and R.sub.Y, respectively. The controlling system finds the crossing point by detecting the frequency f.sub.X-x of the electric signal E.sub.X-x and the frequency f.sub.Y-y of the electric signal E.sub.Y-y, and produces an image on a position, corresponding to the crossing point, on a display panel receiving the electric signals E.sub.X-x and E.sub.Y-y.
REFERENCES:
patent: 5679998 (1997-10-01), Toda
patent: 5723934 (1998-03-01), Toda
patent: 5767608 (1998-06-01), Toda
patent: 5771206 (1998-06-01), Toda
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