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Method and apparatus for calibrating an optical computer input system

  • US 5,181,015 A
  • Filed: 11/09/1990
  • Issued: 01/19/1993
  • Est. Priority Date: 11/07/1989
  • Status: Expired due to Term
First Claim
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1. Optical input system calibration apparatus for facilitating alignment with an image reflected from a viewing surface, comprising:

  • a housing;

    a single light sensing device for detecting the image reflecting from the viewing surface;

    said light sensing device being adapted to be positioned in general alignment with a rectangularly shaped image reflecting from the viewing surface, said rectangularly shaped image being defined by four corner portions;

    universal mounting means mounted to said housing for supporting said light sensing device and for permitting it to be moved to an adjusted position relative to the viewing surface so that the entire image reflecting from the viewing surface is detected;

    means responsive to said light sensing device for generating electrical signals indicative which ones of the corner portions are detected from the image reflecting from the viewing surface;

    alignment means responsive to said electrical signals for determining direction movements required to detect currently undetected corner portions of the reflect image, in any;

    microprocessor means responsive to said alignment means for causing alignment signals to be generated, said alignment signals being indicative of movement directions for repositioning said light sensing device to a corrected position so it receives substantially the entire image reflecting from the viewing surface.

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