Thermal solution for LED bulbs
A light bulb ( 10 ) including an outer housing ( 12 ) shaped like a standard Edison light bulb. The interior of the bulb includes a circuit board ( 24 ) and one or more LEDs ( 26 ). A heat sink ( 30 ) is provided inside the bulb housing that draws thermal energy away from the LEDs using graphite based materials.
1. A light bulb comprising:
an outer housing with a bulbous upper portion and a tapered lower portion having an interior surface, said bulbous upper portion being translucent:
a circuit board having a top surface, a bottom surface, and a circumferential edge and including one or more LEDs positioned on said top surface; and
a thermal management assembly including a planar portion extending along at least a portion of said circuit board between at least one said LED and said circumferential edge, and an interior surface engaging portion extending to said circumferential edge and in contact with substantially the entire longitudinal length of said interior surface of said tapered lower portion.
2. The light bulb of claim 1 wherein at least one of said planar portion and said interior surface engaging portion comprises a compressed mass of exfoliated graphite particles.
3. The light bulb of claim 1 wherein at least one of said planar portion and said interior surface engaging portion comprises a graphitized polyimide sheet.
4. The light bulb of claim 1 wherein said interior surface engaging portion extends in contact with substantially the entire interior circumference of said tapered lower portion.
5. The light bulb of claim 4 wherein said interior surface engaging portion is a single contiguous piece.