Acoustic touch position sensor using higher order horizontally p

Details Acoustic touch position sensor using higher order horizontally p Acoustic touch position sensor using higher order horizontally p

1995-04-19

1997-01-07

Chin, Wellington

Telegraphy

Systems

Position coordinate determination for writing

345177, 367907, G08C 2100

Patent

active

055919456

ABSTRACT:
An acoustic touch position sensor having a transducer which imparts a wave, propagating along a first axis. A reflective array disposed along the first axis which reflects the wave as a set of waves having a horizontally polarized component and a non-uniform volumetric energy density along an axis normal to said surface, traveling along a different axis into the touch surface region of the substrate. The waves are partially absorbed, attenuated or perturbed by an object touching the substrate, to create a modified waveform having characteristics indicative of the axial displacement and/or contact condition of the object with the substrate. The wave perturbation is detected by collecting the set of waves with a reflective array, which redirects the wave energy to a receiving transducer. The transducers preferably produce and are responsive to Rayleigh type waves, with the reflective arrays mode-converting acoustic wave energy between higher order horizontally polarized shear waves and Rayleigh type waves.

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