Patent ID: 6586686
Filing Date: 2003-07-01
Classification: H05K,Y10T

Abstract:
A multilayer printed circuit board having a structure with single-sided circuit substrates, each of said single sided substrates having a conductive circuit formed on one side of an insulating base member thereof and via holes formed in said insulating base member enclosing a conductive material, each of said single-sided substrates having a conductive circuit through adhesive layers, said multilayer printed circuit board comprising:bottom sides of said via holes blocked with said conductive circuit and top sides of the via holes enclosed with the conductive material, said top sides of the via holes being almost flat with the upper side of the insulating base member; projecting conductors formed on the surfaces of via holes opposite to the surface of said insulating base member on which said conductive circuit is formed; wherein said projecting conductors penetrate said adhesive layers so as to be connected to said conductive circuits of the other substrates.