Efficient diffuse light source assembly and method
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United States of America Patent
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Issued Date -
Jan 12, 2006
app pub date -
Jun 20, 2005
filing date -
Feb 19, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A diffuse light source assembly and method including a light source for generating forward propagating light, a solid lightguide disposed adjacent the light source, a diffuser and a back reflecting surface. The solid lightguide includes an input face for receiving the forward propagating light, a sidewall for conveying the forward propagating light via total internal reflection, and an output face for transmitting the forward propagating light. The diffuser is disposed adjacent the output face for diffusing the transmitted forward propagating light, wherein a portion of the forward propagating light is transformed into reverse propagating light, by at least one of the output face and the diffuser, that is conveyed by sidewall via total internal reflection and transmitted by the input face. The back reflecting surface is disposed adjacent the light source for reflecting the reverse propagating light back into the lightguide via the input face.
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