Patent ID: 6265671
Filing Date: 2001-07-24
Classification: H05K

Abstract:
A printed-wiring board comprising:an insulating substrate providing electrical insulation;a first conductive layer providing electric conductivity formed on one or both sides of the insulating substrate;a first insulating layer providing electerical insulation formed at specific sites on the first conductive layer and the specific sites are only in the area of a through hole;a second conductive layer providing electric conductivity formed on the first insulating layer;a second insulating layer providing electrical insulation formed on the second conductive layer; anda third conductive layer providing electric conductivity formed on the second insulating layer,wherein the top surface of the third conductive layer is provided with a smooth surface, so that the third conductive layer has reduced irregularities on its surface,wherein the first insulating layer is formed over the through hole, so as to partially fill the through hole.