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Surface position location system and method

  • US 5,686,705 A
  • Filed: 02/15/1996
  • Issued: 11/11/1997
  • Est. Priority Date: 02/15/1996
  • Status: Expired due to Fees
First Claim
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1. An electrographic sensor unit for use in determining the position of a selected point, which comprises:

  • a layer of a conductive material having an electrical resistivity and a surface;

    three spaced apart contact points electrically interconnected with said layer of conductive material;

    a processor connected to said three spaced apart contact points and disposed to selectively apply a signal to each of said three spaced apart contact points; and

    a probe assembly, including a stylus, coupled to said processor, said stylus disposed to be positioned by a user in vicinity of a user selected point on said surface of said layer and to receive signals from said layer when said three spaced apart contact points have signals selectively applied thereto;

    wherein said position of said stylus relative to said surface of said layer is determinable by said processor from signals received from said stylus each in relation to a similar excitation of two different pairs of said three spaced apart contact points under control of said processor.

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