Patent ID: 7340829

Claim:
A method for fabricating an electrical connection structure of a circuit board, the method comprising the steps of: providing a circuit board having a core circuit board, and the core circuit board having circuits on surfaces thereof and at least one build-up circuit structure formed on top and bottom surfaces of the core circuit board, wherein the build-up circuit structures on the top and bottom surfaces of the core circuit board are electrically interconnected via a plurality of plated through holes formed in the core circuit board, and having a plurality of pads formed on the outmost surfaces of build-up circuit structures thereof, wherein a plurality of conductive vias are formed in the build-up circuit structures and electrically connected to the pads and the plated through holes by conductive circuits, and an insulating layer is applied over the surfaces of the build-up structures and has a plurality of openings for exposing the pads, and the circuit board comprising an electrically active area and an electrically inactive area; attaching a conductive base to one of the surfaces of the circuit board, and allowing the conductive base to be electrically connected to the pads on the corresponding surface of the circuit board; performing an electroplating process via the conductive base, the pads on the surface of the circuit board, and the conductive structures including conductive vias and conductive circuits formed in the build-up circuit structures and plated through holes formed in the core circuit board to deposit a conductive material on the pads on the other one of the surfaces of the circuit board; removing the conductive base; and removing the conductive structure in the electrically inactive area of the circuit board.