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Touch screen

  • US 6,741,237 B1
  • Filed: 08/23/2001
  • Issued: 05/25/2004
  • Est. Priority Date: 08/23/2001
  • Status: Expired due to Term
First Claim
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1. A touch screen system, comprising:

  • a substrate having a surface;

    at least three acoustic wave transducers located at spaced apart locations near a perimeter of the substrate surface;

    a first transducer of the at least three acoustic wave transducers being operative to transmit a first acoustic wave that propagates along the substrate surface;

    second and third transducers of the at least three acoustic wave transducers being operative to receive acoustic waves that propagate along the substrate surface; and

    a control system operative to determine a location of the substrate surface being perturbed based on time delays between transmission of the first acoustic wave from the first transducer and receipt of a corresponding acoustic wave at each of the second and third transducers that was reflected or scattered from the location of the substrate surface being perturbed.

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