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Publication Date: 2003-Apr-16
Document File: 1 page(s) / 20K

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The Prior Art Database



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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.�