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Reflecting light

  • US 20070075648A1
  • Filed: 10/03/2005
  • Published: 04/05/2007
  • Est. Priority Date: 10/03/2005
  • Status: Active Grant
First Claim
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1. A screen apparatus, comprising:

  • a material having a first end, a second end, and a surface for contact by an object;

    a light source to direct light into the first end, reflect the light off internal surfaces of the material including the surface, and to cause the light to exit the second end; and

    a sensor to detect disruption of the light at the second end.

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