Patent ID: 9192045
Filing Date: 2015-11-17
Classification: H05K,Y10T

Abstract:
1. A printed wiring board, comprising: an insulative substrate having a penetrating hole; a first conductive layer formed on a first surface of the insulative substrate; a second conductive layer formed on a second surface of the insulative substrate; and a through-hole conductor formed in the penetrating hole through the insulative substrate such that the through-hole conductor is connecting the first conductive layer and the second conductive layer, wherein the penetrating hole has a first opening portion formed on a first-surface side of the insulative substrate and a second opening portion formed on a second-surface side of the insulative substrate such that the second opening portion has a depth which is greater than a depth of the first opening portion and the second opening portion has a volume which is greater than a volume of the first opening portion, and the through-hole conductor formed in the second opening portion includes a void portion.