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Coordinate detection apparatus and method, and computer program

  • US 7,864,341 B2
  • Filed: 06/30/2008
  • Issued: 01/04/2011
  • Est. Priority Date: 07/23/2007
  • Status: Active Grant
First Claim
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1. A coordinate detection apparatus for detecting coordinates of a light-shielded position, comprising:

  • input means for inputting output from light receiving means; and

    detection means for detecting an obstacle, which exists in a first state, based on a first output from said light receiving means in the first state in which light projecting means projects light, for detecting abnormal light based on a second output from said light receiving means in a state in which said light projecting means does not project any light, and for detecting coordinates of a light-shielded position based on a third output from said light receiving means in a second state in which said light projecting means projects light.

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