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Electrographic apparatus

  • US 4,665,283 A
  • Filed: 11/01/1985
  • Issued: 05/12/1987
  • Est. Priority Date: 11/01/1985
  • Status: Expired due to Term
First Claim
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1. Electrographic apparatus comprising:

  • an electrically insulative support;

    a layer provided as an indium-tin-oxide grain deposition located upon said support having a thickness greater than about 400 angstrum units predetermined to avoid resistivity drift phenomena occasioned by environmental interaction with the outwardly exposed grains of said layer and having a given surface resistivity corresponding with said predetermined thickness;

    said layer defining an active area located within a given profile having a widthwise extent in an x-coordinate direction between first and second spaced apart edges which exhibits a first edge-to-edge resistance therebetween and a lengthwise extent in a y-coordinate direction between third and fourth spaced apart edges which exhibits a second edge-to-edge resistance therebetween;

    said layer within said active area having a pattern of discrete discontinuities;

    wherein said pattern of discontinuities is configured to provide an edge-to-edge resistance aspect ratio between 0.5 and 2.0;

    said first and said second edge-to-edge resistances being within a range of about 400 to 3,000 ohms; and

    access means for capacitively accessing said layer to derive position related signals.

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