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Tablet input device

  • US 5,266,750 A
  • Filed: 05/28/1992
  • Issued: 11/30/1993
  • Est. Priority Date: 05/30/1991
  • Status: Expired due to Term
First Claim
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1. A tablet input device comprising:

  • an input tablet having an X-axis tablet in which X-axis electrodes are formed on both sides of an X-axis of a rectangular resistance layer, and a Y-axis tablet in which Y-axis electrodes are formed on both sides of a Y-axis of a rectangular resistance layer, the X-axis tablet and the Y-axis tablet being in a superposed relation;

    switching elements respectively connected to the X-axis and Y-axis electrodes;

    a pull-down resistor connected to one of the X-axis electrodes;

    a diode connected to one of the Y-axis electrodes along the Y-axis electrode direction;

    means for, during a waiting period, setting the anode side of the diode to a high level; and

    means for, during a waiting period, detecting a voltage variation of the X-axis electrode to which the resistor is connected, and for, when a voltage variation is detected, starting an operation of detecting a position.

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