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Coordinate input device and its control method, and computer readable memory

  • US 6,906,702 B1
  • Filed: 03/16/2000
  • Issued: 06/14/2005
  • Est. Priority Date: 03/19/1999
  • Status: Expired due to Fees
First Claim
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1. A coordinate input device for generating a coordinate value corresponding to light coming from a pointing tool, comprising:

  • optical means for imaging the light;

    a plurality of sensing means, arranged for one coordinate axis, for sensing the light imaged by said optical means, wherein light-receiving areas of said plurality of sensing means have an overlapping portion;

    measurement means for measuring peak levels of data sensed by said plurality of sensing means arranged for the one coordinate axis;

    comparison means for comparing the peak levels measured by said measurement means;

    selection means for selecting one of said plurality of sensing means arranged for the one coordinate axis on the basis of a comparison result of said comparison means; and

    output means for outputting a coordinate value corresponding to the light on the basis of the sensing means selected by said selection means.

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