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Optical coordinate input device comprising few elements

  • US 20080062149A1
  • Filed: 12/03/2003
  • Published: 03/13/2008
  • Est. Priority Date: 05/19/2003
  • Status: Active Grant
First Claim
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1. An input apparatus of computerized device for measuring an object'"'"'s relative location within a predefined measurement space wherein said apparatus is positioned at a single viewing point, said apparatus is comprised of:

  • a. at least one light emitting source transmitting light extending over said predefined measurement space;

    b. a light-receiving unit comprised of at least two photo sensing units for receiving scattered light rays from the object wherein said photo sensing units are placed at far edges of said apparatus creating an optimal viewing angle in relation to the measurement space;

    c. at least two lenses positioned in front of said photo sensing units for condensing said scattered light rays;

    d. a spectrum filter positioned in the route of said light rays wherein said spectrum matches the light spectrum emitted from said light sources;

    wherein the location of the object is calculated using trigonometric and statistical methods on the basis of received light intensity and analysis of differences between at least two captured light images, said differences effected from different viewing angles.

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