Waveguide design incorporating reflective optics
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United States of America Patent
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Apr 1, 2008
Grant Date -
Aug 24, 2006
app pub date -
Feb 7, 2006
filing date -
Feb 7, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to devices for coupling light between an optical waveguide and an optical element in a manner that is substantially independent of temperature, using reflective optics. Certain embodiments of the invention concern improved designs for the transmit and receive optics of a waveguide-based optical touch screen sensor, incorporating reflective optics. The improved designs have substantially temperature independent operation and reduced optical losses. In one preferred embodiment the improved design incorporates a parabolic or quasi-parabolic reflector. In another preferred embodiment the improved design incorporates an elliptical or quasi-elliptical reflector. The transmit and receive elements and associated waveguides preferably comprise photo-patternable polymers.
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