Patent ID: 7948085

Claim:
A circuit board structure, comprising: a carrier board with at least one surface formed with a circuit layer, the circuit layer having a plurality of electrically connecting pads; a first solder mask formed on top of the carrier board and the circuit layer, being higher than the top of the circuit layer, formed with a plurality of first openings for exposing the electrically connecting pads, and being made of a high-insulation photosensitive material; a second solder mask formed on top of the first solder mask, formed with a plurality of second openings for correspondingly exposing the electrically connecting pads beneath the first openings, and being made of a waterproof photosensitive material; and conductive elements formed inside the first and the second openings and electrically connected to the electrically connecting pads, wherein the conductive elements are solder balls or conductive bumps.