Patent ID: 9451711
Filing Date: 2016-09-20
CPC Classification: H05K

Claim Text:
1. A printed wiring board, comprising: an insulating substrate having a penetrating hole formed through the insulating substrate; a first conductive pattern formed on a first surface of the insulating substrate; a second conductive pattern formed on a second surface of the insulating substrate on an opposite side with respect to the first surface of the insulating substrate; and a through-hole conductor formed in the penetrating hole in the insulating substrate such that the through-hole conductor is connecting the first conductive pattern on the first surface of the insulating substrate and the second conductive pattern on the second surface of the insulating substrate, wherein the penetrating hole has a first opening portion opening on the first surface of the insulating substrate, a second opening portion opening on the second surface of the insulating substrate and a third opening portion connecting the first opening portion and the second opening portion, the third opening portion has the maximum diameter which is greater than the minimum diameter of the first opening portion and the minimum diameter of the second opening portion, and the insulating substrate comprises a resin material and a plurality of sheets each comprising a reinforcement material.