Patent ID: 6459046
Filing Date: 2002-10-01
Classification: H05K,Y10T

Abstract:
A printed circuit board comprising:an electrical insulating base material with through holes that are formed in a thickness direction of the electrical insulating base material and are filled with an electrical conductor; the electrical insulating base material comprising a core layer formed by impregnating a holder with a resin, and resin layers formed on both sides of the core layer; and wiring layers that are formed on both surfaces of the electrical insulating base material into a predetermined pattern and are electrically connected to each other by the electrical conductor; wherein the wiring layer is embedded in at least one of the resin layers, the resin layers on the both sides have a thickness different from each other, and a thinner layer out of the resin layers has a thickness equal to or smaller than a mean particle diameter of an electrically conductive filler contained in the electrical conductor.