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COORDINATE DIGITIZER INCREMENTAL SYSTEM

  • US 3,818,133 A
  • Filed: 04/06/1973
  • Issued: 06/18/1974
  • Est. Priority Date: 04/05/1971
  • Status: Expired due to Term
First Claim
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1. In a system for locating the position of a stylus movable along a coordinate axis, the system being of the type having a platen having groups of parallel wires, the wires of each group being interleaved with and parallel to the wires of the other groups whereby the wires of the groups repetitively occur in the same successive order along the coordinate axis, the stylus having an electrical conductor providing capacitive coupling to the wires of the platen, means for simultaneously energizing all the wires of a group with an electrical signal, each group of wires being characterized by its own identifying signal, means connected to the output of the stylus for deriving from each group of wirEs a signal whose amplitude is dependent upon the strength of the signal capacitively coupled to the stylus by that group of wires, the improvement of signal combining means responsive to the ratio of the amplitudes of the derived signals, the signal combining means providing a basic signal which varies periodically in amplitude as the stylus is moved at a uniform ratio along the coordinate axis.

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