| 摘要 |
An elastic wave position-sensing device comprising at least two elastic wave transducing units X and Y having N propagation lanes UXi, (i=1, 2, . . . , N) and UYi (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 PT, a piezoelectric substrate PR, at least an input interdigital transducer formed on one end surface of the piezoelectric substrate PT, and at least an output interdigital transducer formed on one end surface of the piezoelectric substrate PR. Each piezoelectric substrates mounted on one or the other end surface of the nonpiezoelectric plate and the nonpiezoelectric plate form N bilayer zones LTi (i=1, 2, . . . , N), a bilayer zone LR, and a monolayer zone between the bilayer zones LTi and the bilayer zone LR. When an electric signal ET is applied to the input interdigital transducer, an elastic wave is excited in the bilayer zone LTi. The elastic wave is transmitted to the bilayer zone LR through the monolayer zone, and is transduced to an electric signal ER. If touching a crossing point of the lanes UXi and UYi 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 ER corresponding to the crossing point decrease or disappearance. Thus, it is possible to specify the crossing point.
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