Patent ID: 8188379

Claim:
A package substrate structure comprising: a substrate having a first surface and an opposing second surface and characterized by a plurality of wire-bonding pads provided on the first surface of the substrate, a plurality of ball-implanting pads provided on the second surface of the substrate, and at least a cavity formed to penetrate the first and second surfaces of the substrate; a metal board mounted on the second surface of the substrate and covering the cavity, wherein the metal board has a thickness greater than that of each of the ball-implanting pads and has an area greater than that of the cavity of the substrate; and solder masks disposed on the metal board and the first and second surfaces of the substrate respectively, and the solder masks on the first surface of the substrate having at least a solder-mask cavity corresponding in position to the cavity of the substrate, the solder masks on the first and second surfaces of the substrate further having a plurality of openings corresponding in position to and exposing the wire-bonding pads and the ball-implanting pads, wherein a part of a surface of the metal board is exposed from the openings of the solder masks on the second surface of the substrate.