Shear horizontal wave device for sensing a touch-position

Details Shear horizontal wave device for sensing a touch-position Shear horizontal wave device for sensing a touch-position

1997-08-01

1999-03-23

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313D, 178 18, H01L 4108

Patent

active

058864520

ABSTRACT:
An SH wave position-sensing device comprising two SH wave transducing units X and Y, a nonpiezoelectric plate and a signal controller. Each unit contains piezoelectric substrates P.sub.T0, P.sub.R0, P.sub.Ti (i=1, 2, . . . , N) and P.sub.Ri (i=1, 2, . . . , N), interdigital transducers T.sub.0, R.sub.0, T.sub.i (i=1, 2, . . . , N) and R.sub.i (i=1, 2, . . . , N). The interdigital transducers T.sub.0, R.sub.0, T.sub.i and R.sub.i, are formed on an upper- or a lower end surface of the piezoelectric substrates P.sub.T0, P.sub.R0, P.sub.Ti and P.sub.Ri, respectively. The lower end surface of each piezoelectric substrate is cemented on an upper end surface of the nonpiezoelectric plate. The finger direction of each interdigital transducer R.sub.i is slanting to that of each interdigital transducer T.sub.i. When an electric signal is applied to the interdigital transducer T.sub.0, an SH wave is excited in a bilayer zone B.sub.T0 formed by the piezoelectric substrate P.sub.T0 and the nonpiezoelectric plate, transmitted to a bilayer zone B.sub.R0 formed by the piezoelectric substrate P.sub.R0 and the nonpiezoelectric plate, and transduced to an electric signal with a phase .theta..sub.base and delivered at the interdigital transducer R.sub.0.

REFERENCES:
patent: 5679998 (1997-10-01), Toda
patent: 5723934 (1998-03-01), Toda
patent: 5767604 (1998-06-01), Toda
patent: 5767608 (1998-06-01), Toda
patent: 5771206 (1998-06-01), Toda
patent: 5838088 (1998-11-01), Toda

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