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Cursor device for a capacitive coupling tablet

  • US 5,041,820 A
  • Filed: 09/24/1987
  • Issued: 08/20/1991
  • Est. Priority Date: 09/25/1986
  • Status: Expired due to Fees
First Claim
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1. A cursor device for use with a capacitive coupling tablet including therein two groups of conductors arranged spaced apart in a two-dimensional matrix, each group of the conductors being sequentially energized pulsewise, the cursor device comprising:

  • a housing manually movable on the tablet and having a window opposable to the tablet;

    a transparent dielectric pane fitted in the window and having an index formed thereon for indicating a coordinate position on the tablet;

    an electrode disposed under the pane at a position just under the index for detecting pulse signals from the conductors in the tablet through capacitive coupling with the conductors;

    a shielded wire extending under the pane from the electrode for transmitting the signals detected by the electrode, a shielding part of the shielded wire being grounded; and

    a transparent conductive layer formed on the pane to evenly cover the electrode and its surrounding region for capacitively coupling with tablet conductors around the electrode, the conductive layer being grounded.

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