Patent ID: 8324506
Filing Date: 2012-12-04
Classification: C25D,H05K,Y10T

Abstract:
1. A printed wiring board comprising: an insulating resin substrate having a first surface and a second surface, the insulating resin substrate having at least one penetrating-hole passing through the insulating resin substrate from the first surface to the second surface; a first conductor formed on the first surface of the insulating resin substrate; a second conductor formed on the second surface of the insulating resin substrate; and a through-hole conductor structure formed in the penetrating-hole of the insulating resin substrate and electrically connecting the first conductor and the second conductor, wherein the penetrating-hole comprises a first opening portion having a first opening on the first surface and a first sidewall which decreases in diameter from the first opening toward the second surface, and a second opening portion having a second opening on the second surface and a second sidewall which decreases in diameter from the second opening toward the first surface, and wherein the first opening portion and the second opening portion are connected, with axes of the first opening portion and the second opening portion being off set from each other, and a rate of decrease in diameter of the first sidewall is substantially the same as a rate of decrease in diameter of the second sidewall.