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Touch panel input device and control method thereof

  • US 5,638,093 A
  • Filed: 12/06/1994
  • Issued: 06/10/1997
  • Est. Priority Date: 12/07/1993
  • Status: Expired due to Fees
First Claim
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1. A touch panel input device comprising:

  • a panel capable of propagating surface acoustic waves and in which surface acoustic wave attenuation is caused by an object in contact with said panel;

    emission circuit means for outputting a surface acoustic wave drive;

    an emission transducer for emitting surface acoustic waves in said panel in accordance with the surface wave drive outputted from said emission circuit means;

    a reception transducer for receiving surface acoustic waves in said panel and for outputting a received acoustic wave signal; and

    reception circuit means for receiving the received acoustic wave signal from said reception transducer to detect a position at which the received acoustic wave is attenuated as indicative of a position that the object contacts said panel; and

    controller means for controlling said emission circuit and said reception circuit means comprising;

    computing means for computing a width of the contact by the object on said panel in accordance with a waveform detected by said reception circuit means, andjudging means for distinguishing a type of object in contact based on the width obtained by said computing means.

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