Patent ID: 9565775
Date: 2017-02-07
CPC Classifications: H01L,H05K

Claim:
1. A wiring board comprising: a first insulating layer coating a first wiring layer; a first through hole that is opened in a surface of the first insulating layer and that exposes a surface of the first wiring layer; a first via arranged in the first through hole and including an end surface exposed to the surface of the first insulating layer; a metal film disposed between the first insulating layer and the first via in the first through hole, wherein the metal film forms a gap between the first insulating layer and the first via in the first through hole; and a second wiring layer that is stacked on the surface of the first insulating layer and on the end surface of the first via and includes a pad, the pad filling the gap and being greater in planar extent than the first through hole.