Patent ID: 7622183
Filing Date: 2009-11-24
Classification: H05K,Y10T

Abstract:
1. A multilayer printed wiring board comprising; a first conductor layer having at least one conductor circuit portion; an interlaminar insulative resin layer formed on the first conductor layer and having at least one through-hole or opening having an inner wall and a diameter; a second conductor layer formed on the interlaminar insulative resin layer and having at least one conductor circuit portion; and at least one filled viahole formed by substantially filling the through-hole or opening and electrically connecting said conductor circuit portion of said first conductor layer and said conductor circuit portion of said second conductor layer, wherein said filled viahole and said conductor circuit portion of said second conductor layer comprise a plating layer and have surfaces which are leveled substantially at the same height, said conductor circuit portion of said second conductor layer has a thickness which is less than a half of the diameter of the through-hole or opening, and the inner wall of the through-hole is roughened.