Patent ID: 7317166
Filing Date: 2008-01-08
Classification: H05K,Y10T

Abstract:
1. A wiring base board, comprising: an insulating substrate; a first via hole part that is formed in said insulating substrate and provides a plurality of first circumferential face parts; and a plurality of second via hole parts, each providing a second circumferential face part arranged in a concentric circle pattern with one of the first circumferential face parts, each of said second via hole parts having a same central axis as one of the first circumferential face parts, said second via hole parts being formed in said first via hole part through an insulator, said first and second circumferential face parts forming said concentric circle pattern with the same central axis being made into coaxial structure parts, wherein each of said coaxial structure parts has an opposing face part where one of said first circumferential face parts of said first via hole part opposes to said second circumferential face part of one of said second via hole parts at an equal distance.