Patent ID: 7889502
Filing Date: 2011-02-15
Classification: H01L,H05K,Y10T

Abstract:
1. A circuit assembly comprising a substrate which comprises a dielectric layer, a heat spreader layer which comprises at least one sheet of compressed particles of exfoliated graphite having two major surfaces, wherein the heat spreader layer is located at a first surface of the substrate, wherein the second surface of the substrate has a circuit thereon and an LED having an LED mounting plane mounted on the circuit, and a thermal pathway in thermal connection with both the heat spreader layer and the LED, wherein the thermal pathway has a length such that it extends through the substrate and at least substantially through the heat spreader layer and further wherein the surface area of the major surface of the heat spreader layer which is located at the first surface of the substrate is greater than the surface area of the surface of the substrate at which the heat spreader layer is located such that the heat spreader layer extends perpendicular to the LED mounting plane.