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Cordless position detection apparatus

  • US 5,557,076 A
  • Filed: 11/14/1994
  • Issued: 09/17/1996
  • Est. Priority Date: 11/12/1993
  • Status: Expired due to Fees
First Claim
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1. A cordless position detection apparatus, comprising:

  • a position detection area in which a plurality of conductors are provided that are arranged in direction of the measurement of the position sidea selection circuit for selecting single conductors;

    a transmitting circuit that provides a transmitting signal to a selected conductor said transmitting signal comprising at least one harmonic;

    a pointer comprising a resonance circuit that is excited by the transmitting signal to oscillate and that radiates a receiving signal;

    a receiving circuit for detecting the receiving signal in a selected conductor; and

    processing means for determining a position indicated by the pointer by processing the receiving signals detected by the receiving circuit, wherein the resonance circuit is tuned to an harmonic of the transmitting signal.

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