Patent ID: 8164003

Claim:
A circuit board surface structure, comprising: a circuit board with at least one surface having a plurality of electrically connecting pads; a first insulating protective layer and a second insulating protective layer formed on the surface of the circuit board in sequence; a first opening and a second opening penetratingly formed in the first and second insulating protective layers respectively to expose the electrically connecting pads on the surface of the circuit board, wherein the first and second openings are tapered upward, and the first opening has a greater diameter than the second opening; and conductive elements formed on a part of the top surface of the second insulating protective layer and surfaces of the electrically connecting pads in the first and second openings, wherein each of the conductive elements is a solder or a metal bump, and the width of each of the conductive elements formed on a part of the top surface of the second insulating protective layer is larger than width of the second opening.