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Acoustic wave sensor with EMAT drive

  • US 6,933,932 B2
  • Filed: 09/17/2002
  • Issued: 08/23/2005
  • Est. Priority Date: 09/17/2002
  • Status: Expired due to Fees
First Claim
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1. An acoustic wave touch sensor comprising:

  • a body with an acoustic wave cavity formed therein and defined by a raised area, the acoustic wave cavity having a touch surface and at least a portion of the acoustic wave cavity being formed of an electrically conducting material; and

    an electromagnetic acoustic transducer positioned adjacent to a surface of the acoustic wave cavity opposite the touch surface, the electromagnetic acoustic transducer having a primary coil generating a resonant acoustic wave in the acoustic wave cavity and a pickup coil providing an electrical output signal, wherein a touch on the touch surface produces a detectable change in the electrical output signal.

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