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Contact sensitive device

  • US 7,376,523 B2
  • Filed: 12/21/2006
  • Issued: 05/20/2008
  • Est. Priority Date: 12/06/2002
  • Status: Expired due to Fees
First Claim
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1. A method of determining information relating to a contact on a contact sensitive device comprising:

  • providing a member capable of supporting bending waves and a plurality of sensors for measuring bending wave vibration in the member;

    measuring a bending wave signal using each of the sensors in response to a contact being applied to the member at a location;

    determining a phase angle for each measured bending wave signal;

    calculating a phase difference between the phase angles of each sensor pair of at least two pairs of sensors; and

    determining the location of the contact utilizing the at least two calculated phase differences.

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