Illumination device
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United States of America Patent
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Apr 10, 2012
Grant Date -
Aug 12, 2010
app pub date -
May 1, 2008
filing date -
May 1, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
An illumination device having an optical waveguide stage to which is optically coupled a light-projecting stage. The illumination device accepts light from a small isotropic light source such as a light emitting diode or a bulb coupled to the optical waveguide stage. The illumination device spreads the light over a wide area while also collimating it to form a beam. The light-projecting stage and the optical waveguide stage are made of thin slabs of optically transmissive material.
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