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Optical scanning-type touch panel

  • US 20010002694A1
  • Filed: 01/18/2001
  • Published: 06/07/2001
  • Est. Priority Date: 08/18/1998
  • Status: Active Grant
First Claim
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1. An optical scanning-type touch panel comprising:

  • a light retro-reflecting member disposed outside a predetermined area;

    at least two light transmitting and receiving sections, each having an optical scanner for angularly scanning light in a plane substantially parallel to the predetermined area and a light receiving element for receiving reflected light from a portion of the light retro-reflecting member, which portion was illuminated with light;

    a measuring section for measuring a scanning light cut-off region formed in the predetermined area by an indicator, based on a scanning angle of said optical scanner and a result of receiving light by said light receiving element;

    a calculating section for calculating a position and size of the indicator according to a result of the measurement performed by said measuring section;

    an angle detecting section for detecting an angle of the scanning light; and

    a memory section for storing a plurality of reference values of different levels, wherein said measuring section measures the scanning light cut-off region by comparing the result of receiving light by said light receiving element with one reference value selected from the plurality of reference values stored in said memory section according to the angle of the scanning light detected by said angle detecting section.

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