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Publication Date: 2003-Apr-16
Document File: 1 page(s) / 19K

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In this invention, the heat sink is partitioned (or segmented) and thermally isolated for each color LEDs.  Thus the AllnGaP Red LEDs are mounted on a segmented heat sink, which is thermally isolated from the Green and Blue LEDs part of the heat sink.  Therefore, the heat loss from the Green LEDs does not reach the RED LED heat sink and the adverse feedback effect (from the Green's) can be avoided.  The operating temperature of the AllnGaP LEDs can be lower than the operating temperature of the Green and Blue LEDs.  The reduction in temperature of the Red LED consequently increases the efficiency and reduces the variation in white color with the temperature (and increase the color stability). 

The partitioning of the heat sink is done in such a way not to alter the optical placement of the LEDs and the existing heat sink mountings.  This can be accomplished in the existing heat sink by doing the partitioning based on the LED placements.  Then each colored LEDs can be mounted on the corresponding heat sink partitions and the complete luminary can be easily assembled using mechanical holders. 

In order to thermally isolate each segment of the heat sink, thermally non-conductive material (styrofoam, fiberglass, DuPont, etc.) is introduced between them.