| 摘要 |
An acoustic wave touch position sensor in which a transducer (14) coupled to a substrate (10) imparts a surface acoustic wave, into the substrate (10) for propagation along a first axis. A reflecive array (28, 34, 30, 36) having selective reflection characteristics for various wave propagation modes is disposed along the first axis to create a higher order horizontally polarized shear wave having an order greater than zero perpendicular to the axis, so that a touch surface (40) of the substrate (10) is imparted with shear wave energy. This energy may be partially absorbed, attenuated or perturbed by an object touching the substrate (10), to create a modified waveform having a characteristic indicative of the axial displacement and/or contact condition of the object with the substrate (10).
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