Patent ID: 7802361

Claim:
A method of manufacturing the BGA package board, comprising: (A) providing a base plate including a first external layer, a second external layer, and an insulating layer provided between the first and second external layers; (B) forming a pattern including a circuit pattern and a wire bonding pattern on the first external layer, and forming a pattern including a circuit pattern and a solder ball pad pattern on the second external layer; (C) coating a solder resist on each of the first and second external layers, and forming a solder resist pattern which is opened at portions corresponding to the wire bonding pad pattern and the solder ball pad pattern; and (D) partially etching the solder ball pad pattern of the second external layer; wherein the solder ball pad pattern is composed of a partially etched portion of an originally formed pattern of the second external layer, and the circuit pattern of the second external layer is composed of the originally formed pattern of the second external layer resulting in the solder ball pad pattern having a reduced thickness as compared with the circuit pattern of the second external layer.