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Ultrasonic coordinates input device

  • US 5,750,941 A
  • Filed: 08/29/1995
  • Issued: 05/12/1998
  • Est. Priority Date: 12/15/1994
  • Status: Expired due to Term
First Claim
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1. An ultrasonic coordinates input device comprising:

  • a propagator for allowing ultrasonic wave to propagate therethrough;

    input means for inputting ultrasonic waves to the propagator;

    a plurality of groups of receivers each receiving the ultrasonic waves propagated through the propagator; and

    arithmetic means for calculating the coordinates of the ultrasonic wave inputted positions on the propagator on the basis of the signals received at the receivers in the respective groups;

    wherein each group of receivers includes at least three receivers which are substantially aligned.

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