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Acoustic condition sensor employing a plurality of mutually non-orthogonal waves

  • US 20030164820A1
  • Filed: 06/22/2002
  • Published: 09/04/2003
  • Est. Priority Date: 04/19/1995
  • Status: Active Grant
First Claim
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1. A touch sensor comprising:

  • an acoustic wave transmissive medium having a surface and a touch sensitive portion of said surface;

    a transducer system for emitting acoustic energy into said medium; and

    a receiver system for receiving the acoustic energy from the substrate as at least two distinct sets of waves, a portion of each of which overlap temporally at said receiver system or overlap physically by propagating in said touch sensitive portion along axes which are substantially non-orthogonal;

    said receiver system determining a position or a waveform perturbing characteristic of a touch on said touch sensitive portion.

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