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POSITION DETECTING DEVICE AND POSITION DETECTING METHOD

  • US 20090065269A1
  • Filed: 09/08/2008
  • Published: 03/12/2009
  • Est. Priority Date: 09/10/2007
  • Status: Active Grant
First Claim
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1. A position detecting device for detecting an indicated position of a position indicator on a position detecting area, comprising:

  • an excitation coil arranged to surround a periphery of a position detecting area to supply an excitation signal to the position indicator;

    a sensor configured to detect an AC signal transmitted from the position indicator based on the excitation signal supplied from the excitation coil, to thereby detect an indicated position of the position indicator on the position detecting area; and

    a controller configured to control a strength of the excitation signal to be supplied from the excitation coil based on information obtained from an analysis of the detected AC signal.

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