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Touch sensitive device employing bending wave vibration sensing and excitation transducers

  • US 20050146513A1
  • Filed: 12/31/2003
  • Published: 07/07/2005
  • Est. Priority Date: 12/31/2003
  • Status: Active Grant
First Claim
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1. A touch sensitive apparatus, comprising:

  • a touch plate;

    a plurality of sensors coupled to the touch plate, each of the sensors configured to sense bending waves in the touch plate;

    an excitation transducer coupled to the touch plate and configured to induce bending waves in the touch plate;

    a plurality of active buffer circuits, each of the active buffer circuits respectively coupled to one of the sensors; and

    a controller coupled to the sensors via the active buffer circuits and to the excitation transducer via a non-actively buffered connection, the controller configured to compute information related to a touch on the touch plate responsive to sense signals received by the sensors.

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