Cycling LED heat spreader
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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Abstract
A graphite heat spreader is provided for use with a flash LED light source for a camera of a handheld device such as a cell phone. Dramatically reduced operating temperatures are provided at substantially increased power levels thus providing both improved lighting and improved operating life of the electronic components.
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Citations
13 Claims
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1. A handheld electronic device, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A handheld electronic device, comprising:
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a housing; a camera disposed in the housing; and a light source assembly disposed in the housing adjacent the camera, the light source including; a substrate; a light emitting diode light source which is capable of cycling on and off mounted on one side of the substrate; and a graphite heat spreader attached to an opposite side of the substrate, the graphite heat spreader having an in plane thermal conductivity substantially greater than a through plane thermal conductivity thereof. - View Dependent Claims (10, 11, 12, 13)
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Specification