Patent ID: 7189302

Claim:
A method for fabricating a multi-layer printed circuit board (PCB), comprising: attaching a releasing film to both an upper and a lower surface of a center layer, attaching a first metal film to the releasing film, and attaching a first dry film to a surface of each first metal film, thereby forming a base member; forming a first connection portion on the first metal film by an electroplating process, comprising: selectively removing portions of each first dry film, thereby exposing corresponding portions of each first metal film to form first plate openings; forming a first plate layer on the corresponding portions of each first metal film exposed through the first plate opening of each first dry film such that each first plate layer is electrically connected to its corresponding first metal film; grinding each first plate layer to a predetermined thickness; and removing each first dry film, thereby forming a first connection portion from each first plate layer; laminating an insulating material on the surface of each first metal film where each first connection portion is formed, and then heating and pressuring the insulating material, thereby forming a first insulating layer at each first connection portion; forming a second connection portion on a surface of the first connection portion by an electroplating process, thereby forming an integral connection portion from the first connection portion and the second connection portion, comprising: depositing a second dry film on a surface of each first insulating layer; selectively removing portions of each second dry film corresponding to the first connection portions, thereby forming a second plate opening in each second dry film; forming a second plate layer at an end of each first connection portion exposed through the second plate opening; grinding each second plate layer to a predetermined thickness; and removing each second dry film, thereby forming a second connection portion, each corresponding first and second connection portion forming an integral connection portion; laminating an insulating material on a surface of each first insulating layer and then forming a second insulating layer through which each connection portion protrudes; forming a second metal film on each second connection portion such that each second metal film is electrically connected to its corresponding first metal film via a corresponding integral connection portion; cutting both end portions of the base member in a vertical direction at a position inside of an outer edge of the releasing films, thereby releasing the first metal layers from the releasing films to form first and second printed circuit boards; and selectively removing portions of each second metal film, thereby forming copper patterns on a surface of each second insulating layer such that each copper pattern is electrically connected to its corresponding connection portion.