Patent ID: 7341934

Claim:
A method for fabricating conductive bumps of a circuit board, comprising the steps of: providing a circuit board having a first surface and a corresponding second surface, the first surface and the second surface being formed with circuit structures having a plurality of conductive pads, the circuit board being formed with conductive structures for electrically connecting the circuit structures formed on the first surface and the second surface, wherein the conductive structures between the two circuit structures are plated through holes and conductive vias, the circuit board being formed with an insulating layer having a plurality of openings penetrating therethrough to expose the plurality of conductive pad; forming a conductive layer on a surface of the insulating layer having the opening on the first surface of the circuit board; performing an electroplating process via the conductive layer formed on the first surface of the circuit board and the conductive structure formed in the circuit board, such that a conductive bump is formed on each of the conductive pads on the second surface of the circuit board; forming a resist layer on the second surface of the circuit board for covering the conductive bump, and forming another resist layer on the first surface of the circuit board, wherein the another resist layer has a plurality of openings penetrating therethrough to expose the conductive pad; and performing an electroplating process on the circuit board to form a plurality of conductive bumps corresponding in position to the conductive pads on the first surface of the circuit board.