Patent ID: 6662442
Filing Date: 2003-12-16
Classification: H01L,H05K,Y10T

Abstract:
A process for producing a printed wiring board, which comprises the steps of:(1) forming a first insulator layer having a first through-hole on a substrate, the first through-hole penetrating in a thickness direction of the first insulator layer; (2) forming a conducting passage through the first through-hole by plating with metal so as to deposit up to substantially a same level as an upper surface of the first insulator layer thus forming an even upper surface; (3) forming a thin metal film on the first insulator layer and the conducting passage so that the thin metal film has an almost flat surface and lacks unevenness; (4) forming a conductor layer in a prescribed circuit pattern on the thin metal film by plating so that the conductor layer has an almost flat surface and lacks unevenness; (5) removing a portion of the thin metal film on which the conductor layer is not formed; (6) forming a second insulator layer on the conductor layer; and (7) removing the substrate.