Patent ID: 6670102
Filing Date: 2003-12-30
Classification: H05K

Abstract:
A method for manufacturing a circuit board having a conductive via comprising the steps of:providing a substrate having a first surface and a first conductive layer on at least one region of said first surface; forming an insulating layer on said first conductive layer; forming an opening in said insulating layer, said opening extending to said first conductive layer; forming a second conductive layer inside said opening and at least on said insulating layer near said opening; applying a positive photoresist on said second conductive layer; exposing said positive photoresist; developing said exposed positive photoresist, and removing said positive photoresist on said second conductive layer, except a portion of said second conductive layer that is inside said opening; etching said second conductive layer, to said surface of said insulating layer near said opening; removing said positive photoresist from inside said opening; and forming a third conductive layer inside said opening.