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Coordinate detecting method

  • US 4,758,690 A
  • Filed: 03/03/1987
  • Issued: 07/19/1988
  • Est. Priority Date: 07/12/1986
  • Status: Expired due to Term
First Claim
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1. A coordinate detecting method comprising the steps of:

  • establishing coordinate positions of a plurality of coarse regions while taking as a reference the polarity reversing positions of a magnetic field detected when a scan signal is sent to scan an input plane equipped with a plurality of main loops made of parallel embedded conductors such that the main loops are driven in sequence by the scan signal;

    specifying one coarse region, in which a coordinate designating member is located, to be interpolated;

    interpolating a designated position of the coordinate designating member located within the specified coarse region; and

    calculating the coordinate of the designated position on the input plane designated by the coordinate designating member on the basis of the coordinate position of the specified coarse region and an interpolation value obtained in the interpolating step,wherein the coordinate position of the specified coarse region is obtained by accessing a ROM table storing therein a deviation amount (On, n=an integer) between the coordinate position of each loop (Ln) and the coordinate position of a start point of the corresponding coarse region (Sn) so as to obtain a pertinent deviation amount, and by adding it to the coordinate position of the corresponding loop (Ln).

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