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Optical scanning-type touch panel

  • US 6,480,187 B1
  • Filed: 04/17/1998
  • Issued: 11/12/2002
  • Est. Priority Date: 08/07/1997
  • Status: Expired due to Fees
First Claim
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1. An optical scanning-type touch panel in which a region of a plane specified as an object is to be touched is touched by an indicator so that information is inputted, said touch panel, comprising:

  • light recurrence reflection means provided at the outside of said plane;

    at least two sets of light send/receive means having light emitting means, optical scanning means for periodically scanning a light emitted from said light emitting means angularly in a plane which is substantially parallel with said plane and light receiving means for receiving a reflected light of the light scanned by said optical scanning means from said light recurrence reflection means;

    comparison means for comparing a light receiving signal by each of said light receiving means with a predetermined threshold value so as to detect a cut-off timing in the case where the indicator exists within the region of said plane;

    measuring means for measuring a cut-off region of a scanning light by said indicator within the region of said plane based on a scanning angle of each of said optical scanning means and the compared result of said comparison means; and

    calculating means for calculating a position and size of said indicator within the region of said plane according to the measured result by said measuring means.

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