Patent ID: 7459112
Filing Date: 2008-12-02
Classification: H01L,Y10T

Abstract:
1. A method of fabricating a thermal spreading device, the method comprising: arranging a plurality of thermally conductive rods such that the rods extend longitudinally in a common direction; disposing a molding material radially about the longitudinally extending rods; and hardening the molding material around the plurality of thermally conductive rods; wherein said arranging of the plurality of rods is such that a density of the arrangement of the rods is variable over a cross sectional area of the arrangement; wherein the arrangement is configured to form at least one higher density region positioned to register with at least one higher heat flux area of a chip upon assembly of the thermal spreading device to the chip to form an interface surface of the thermal spreading device and the chip; wherein the arrangement of the rods is configured to form at least one lower density region positioned to register with at least one area of lower heat flux area of the chip upon assembly of the thermal spreading device to the chip; wherein the higher density region has a higher density than the lower density region and the higher heat flux area has a higher heat flux than the lower heat flux area; and wherein the at least one higher density region and the at least one lower density region are positioned so as to minimize a disparity in heat buildup at the interface surface between the higher heat flux area and the lower heat flux area.