Patent ID: 6613413
Filing Date: 2003-09-02
Classification: H05K,Y10S,Y10T

Abstract:
A power/ground core for use in printed circuit boards, the power/ground core comprising: a first non-conductive water-permeable layer of first fiber laminate; and a first metal sheet that includes a two-dimensional distribution of through holes formed therethrough,wherein the first non-conductive layer is in surface contact with the first metal sheet, wherein the first metal sheet is water permeable only through its through holes, wherein the through holes in the first metal sheet do not extend into the first non-conductive layer, wherein the through holes in the first metal sheet have spacings therebetween, and wherein the spacings and diameters of the through holes in the first metal sheet are sufficient to permit water in the first non-conductive layer to pass through the through holes in the first metal sheet sufficiently fast so as to prevent the water in the first non-conductive layer from collecting at the interface between the first non-conductive layer and the first metal sheet.