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Cycling LED Heat Spreader

  • US 20070103875A1
  • Filed: 08/22/2006
  • Published: 05/10/2007
  • Est. Priority Date: 11/04/2005
  • Status: Active Grant
First Claim
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1. A handheld electronic device, comprising:

  • a housing;

    a light source assembly disposed in the housing, the light source including;

    a substrate including an electrical circuit which provides the capability to cycle the light source on and off, the substrate having first and second major surfaces;

    a light emitting diode light source located adjacent the first major surface of the substrate and connected to the electrical circuit; and

    a heat spreader including a sheet of graphite, the heat spreader being in heat conducting association with the second major surface of the substrate wherein the light source can be cycled on and off within 10 seconds for at least two cycles without an appreciable rise in the maximum temperature from cycle to cycle.

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