Patent ID: 7217370
Filing Date: 2007-05-15
Classification: H01L,H05K

Abstract:
1. A process for producing a wiring board, comprising the steps of: forming a first conductor film on a first main surface of a first insulating substrate and forming a second conductor film on a second main surface of the first insulating substrate remote from the first conductor film; forming a first via hole at a predetermined position of the first insulating substrate from the second conductor film side; forming a third conductor film on the surface of the second conductor film and within the first via hole; etching the second conductor film and the third conductor film to form a conductor pattern having openings at predetermined positions; forming a fourth conductor film on the surface of the conductor pattern through a second insulating substrate; forming, from the fourth conductor film side, a second via hole, which extends through the second insulating substrate to the conductor pattern, and a third via hole which extends through the second insulating substrate and the first insulating substrate to the first conductor film; forming a fifth conductor film on the surface of the fourth conductor film and within the second via hole and the third via hole; etching the first conductor film to form a conductor wiring to be connected to an external terminal (a bonding pad) of a semiconductor chip; and etching the fourth conductor film and the fifth conductor film to form a connection terminal to be connected to the conductor wiring or the conductor pattern through the via.