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Low profile touch panel systems

  • US 8,384,693 B2
  • Filed: 08/29/2008
  • Issued: 02/26/2013
  • Est. Priority Date: 08/30/2007
  • Status: Expired due to Fees
First Claim
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1. A touch detection system comprising:

  • an illumination source positioned at least partially below a plane of a touch surface and configured to direct light in a first optical path;

    an optical detection system positioned at an edge of the touch surface and positioned partially above and partially below the plane of the touch surface; and

    an optical assembly positioned at the edge of the touch surface and extending above the plane of the touch surface so as to intersect with a detection plane above the plane of the touch surface, the optical assembly configured to reflect or refract light from the first optical path laving in the detection plane to a second optical path into the optical detection system via a pinhole;

    aperture, the second optical path being non-parallel to the first optical path;

    wherein the optical assembly defines a profile height above the plane of the touch surface, the profile height approximately equal to the diameter of the pinhole aperture.

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