Patent ID: 7772703

Claim:
A package substrate, comprising: a circuit board; a reinforcing plate, wherein the reinforcing plate comprises a first surface and a second surface and the first surface of the reinforcing plate extends substantially throughout the circuit board to resist warpage of the circuit board, and the reinforcing plate has an opening corresponding to a first contact of the circuit board exposed in the opening, and wherein the reinforcing plate comprises an insulating film on the first surface and the second surface and a metal plate, the metal plate is a single plate, and all the surfaces of the metal plate are entirely covered by the insulating film so that no electrical contact exist between the metal plate and the circuit board; and at least one conductive channel, passing through the metal plate with one end being located in the opening and electrically connected to the first contact, and with the other end being located on the second surface of the reinforcing plate to form a bonding pad, wherein the bonding pad is positioned at a periphery of the opening.