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Coordinate input apparatus

  • US 8,982,102 B2
  • Filed: 02/25/2013
  • Issued: 03/17/2015
  • Est. Priority Date: 03/08/2012
  • Status: Active Grant
First Claim
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1. A coordinate input apparatus which detects a pointed position to an effective coordinate input region, comprising:

  • a light projecting unit constructed to project light to the effective coordinate input region;

    a reflection unit constructed to retroreflect the light projected by said light projecting unit;

    a light receiving unit constructed to receive light from one of said light projecting unit and said reflection unit;

    a moving unit constructed to move a set of said light projecting unit, said light receiving unit, and said reflection unit in order to change a light amount received by said light receiving unit;

    a determination unit constructed to determine whether the light amount received by said light receiving unit is appropriate for calculating the pointed position in the effective coordinate input region; and

    a notification unit constructed to notify a determination result of said determination unit.

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