Light guide illumination device appearing uniform in brightness along its length
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United States of America Patent
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Mar 8, 2005
Issued Date -
N/A
app pub date -
Jan 10, 2000
filing date -
Oct 24, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
An illumination device that is relatively bright and uniform in appearance includes a light guide, which has a light guide core having an optically smooth surface for propagating light therethrough. A light emitting region, which extends along a portion of the core, includes at least one light extraction structure located along the optically smooth surface of the light guide core. The light extraction structure, which includes an optically reflective surface extending into the light guide core, is oriented to reflect light at an angle less than a critical angle necessary for light to propagate through the light guide core. A diffuse reflective material is disposed around at least a portion of the light guide. The diffuse reflective material directs at least a portion of the light reflected by the light extraction structure back through the light guide so that light is emitted through the light emitting region of the optically smooth surface.
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