Patent ID: 8115114
Filing Date: 2012-02-14
Classification: B32B,C04B,H01L,H05K

Abstract:
1. A method for manufacturing a ceramic substrate having a via hole and a surface wiring pattern electrically connected to the via hole, the method comprising the steps of: preparing a sintered ceramic substrate having a via hole; forming on the sintered ceramic substrate a sintered ceramic layer having a hole or opening at least a part of whose bottom is at least a part of exposed end surface of the via hole by post-firing method; forming inside the hole or opening a conductive portion which electrically connects the surface of the sintered ceramic layer and the via hole; and forming on the surface of the sintered ceramic layer a surface wiring pattern electrically connected to the conductive portion, wherein the step of preparing the sintered ceramic substrate having a via hole comprises the steps of: piercing a ceramic green sheet at a predetermined position; filling a metal paste into the pierced hole to form a first precursor; and firing the first precursor to form a second precursor having a via hole, and wherein the step of forming the sintered ceramic layer by post-firing method comprises the steps of: forming on the sintered ceramic substrate having a via hole a ceramic paste layer having a hole or opening at least a part of whose bottom is at least a part of exposed end surface of the via hole; and firing the ceramic paste layer.