Patent ID: 7859848
Filing Date: 2010-12-28
Classification: H01L,Y10T

Abstract:
1. A heat spreader comprising: a) a first planar element of pyrolytic graphite having a relatively high thermal conductivity in a direction of a first lateral dimension of a first plane of the first planar element and in the thickness direction of the first planar element and having a relatively low thermal conductivity in a direction of second lateral dimension of the first planar element, wherein the direction of the first lateral dimension of the first plane of the first planar element and the thickness direction of the first planar element extend substantially in directions of orientation of a axes of the pyrolytic graphite of the first planar element and the direction of the second lateral dimension of the first planar element extends substantially in the direction of the c axis of the pyrolytic graphite of the first planar element, b) a second planar element of pyrolytic graphite having a relatively high thermal conductivity in a direction of a first lateral dimension of a second plane of the second planar element and in the thickness direction of the second planar element and having a relatively low thermal conductivity in a direction of a second lateral dimension of the second planar element, wherein the direction of the first lateral dimension of the second plane of the second planar element and the thickness direction of the second planar element extend substantially in directions of orientation of a axes of the pyrolytic graphite of the second planar element and the direction of the second lateral dimension of the second planar element extends substantially in the direction of the c axis of the pyrolytic graphite of the second planar element, wherein each of the first planar element and second planar element have a first side and a second side, the first side and second side of each of the first planar element and second planar element being substantially parallel and being spaced apart in the direction of the second lateral dimension at a first distance, the first side and second side of each of the first planar element and second planar element extending substantially normal to the direction of the second lateral dimension of the first planar element and the second planar element respectively wherein at least a portion of the first side of the first planar element adjoins at least a portion of the second side of the second planar element; and wherein the first side of the first planar element substantially coextensively adjoins at least a portion of the second side of the second planar element.