Patent ID: 7976956
Filing Date: 2011-07-12
Classification: B32B,H05K,Y10T

Abstract:
1. A laminated circuit board comprising: a surface treated copper foil, and a resin board laminated on the surface treated copper foil, the resin board comprising through holes, the through holes being filled with a conductive paste containing a low melting point metal, wherein the surface treated copper foil comprises an untreated foil and a layer comprising roughening particles thereon, the roughening particles comprising copper atoms, wherein the number of copper atoms in a boundary layer comprising roughening particles is four times or less than a number of low melting point metal atoms which diffuse from the conductive paste to the boundary layer comprising roughening particles, wherein the boundary layer is the region where a through hole comes in contact with said surface treated copper foil having roughening particles, wherein the surface treated copper foil includes projections of 200 to 150,000 having a height of 0.3 to 3.0 μm in the foil surface area of 100 μm×100 μm; wherein luminosity of the surface of the roughening treated layer is 35 or less, wherein the roughening particles form projections in the layer comprising roughening particles, and wherein the surface roughness of the untreated foil is 0.1 to 5 μm at least on one surface, and the surface roughness of the surface treated copper foil is 0.3 to 10 μm.