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Position transducer, and method for eliminating noise therefrom

  • US 5,691,512 A
  • Filed: 05/03/1995
  • Issued: 11/25/1997
  • Est. Priority Date: 05/16/1994
  • Status: Expired due to Fees
First Claim
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1. A position transducer, comprising:

  • a plurality of loop coils arranged side by side in a direction of position sensing;

    a position indicator for electromagnetic interaction with one of said loop coils;

    a transmission means for selectively transmitting or interrupting a first signal to said one of said loop coils;

    a receiving means for receiving a second signal from said one of said loop coils;

    a first memory means for storing a level of said second signal, said level being obtained as a result of processing of said second signal;

    subtraction means for extracting an amplitude level, corresponding to said second signal developed in said one of said loop coils as a result of the electromagnetic interaction of said position indicator with said one of said loop coils, by subtracting a noise level obtained from a third signal received when transmission of said first signal is interrupted, from said second signal level; and

    processing means for calculating coordinates of said position indicator based on said amplitude level.

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