Patent ID: 6573028
Filing Date: 2003-06-03
Classification: H01L,H05K

Abstract:
A method for fabricating a semiconductor module substrate sheet, said method comprising:providing metal layers on two surfaces of an insulating substrate and a side wall surface of the insulating substrate; forming photoresist films on the metal layers; partially exposing the formed photoresist films on the metal layers on the two surfaces of the insulating substrate and the sidewall surface of the insulating substrate to light and then developing the formed photoresist films such that a pattern of etching resist layers exists on portions of the metal layers to be left as inner lead sections and outer lead sections and portions of the metal layers to be left as connecting sections on the sidewall surface to connect the inner lead sections and outer lead sections; removing by etching, portions of the metal layers that are not covered with the etching resist layers; and removing the etching resist layers to form the inner lead sections, the outer lead sections and the connecting sections.