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Coordinate input detection device and method for electronic blackboard

  • US 6,762,747 B2
  • Filed: 09/19/2001
  • Issued: 07/13/2004
  • Est. Priority Date: 09/20/2000
  • Status: Active Grant
First Claim
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1. A method of optically determining coordinates in a predetermined space, comprising the steps of:

  • providing a predetermined number of pairs of light emitting elements and light detecting elements in the predetermined space defined by a predetermined number of axes;

    placing each of the pairs parallel to one of the predetermined number of the axes, each of the pairs including one linearly and equidistantly placed set of the light emitting elements and another linearly and equidistantly placed set of the light detecting elements;

    sequentially activating one of the light emitting elements in one of the pairs for emitting light;

    inputting input coordinates in the predetermined space by interrupting the emitted light from the sequentially activated one of the light emitting elements;

    detecting the light from the sequentially activated one of the light emitting elements at a plurality of predetermined ones of the light detecting elements of the one of the pairs so as to generate a detection result, the predetermined ones of the light detecting elements overlap for some of the sequentially activated ones of the light emitting elements;

    repeating said sequentially activating and said detecting for each of the predetermined number of the axes; and

    determining the input coordinates in the predetermined space based upon the detection result from said detecting.

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