Optical system for a light emitting diode with collection, conduction, phosphor directing, and output means
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United States of America Patent
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Oct 23, 2012
Grant Date -
May 24, 2012
app pub date -
Jan 27, 2012
filing date -
Jun 11, 2009
priority date (Note) -
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Abstract
An optical system with an LED light source utilizes a base with an inverted conical shape to conduct light to a phosphor layer. The phosphor layer emits light from both upper and lower surfaces. The base and a substantially mirror image cap element facilitate efficient extraction of the phosphor-generated light from the optical system so that the output of the system is omni-directional light suitable for common lighting applications. The system is very efficient in that nearly all the light generated by the LED is transmitted to the phosphor layer, and nearly all the light emitted from the phosphor layer is output from the system.
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