Patent ID: 7189302
Filing Date: 2007-03-13
Classification: H05K,Y10T

Abstract:
1. 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: 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: 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.