Patent ID: 7817441
Filing Date: 2010-10-19
Classification: H01L,H05K

Abstract:
1. A circuit board, comprising: a circuit board body having a plurality of electrically connecting pads disposed on one surface of the circuit board body; an insulating protection layer formed on the circuit board body and having a plurality of openings corresponding in position to and exposing the electrically connecting pads, the openings being larger than the electrically connecting pad, allowing the insulating protection layer to be free from contact with a sidewall of the electrically connecting pad; an electrically conductive layer formed on a central portion of each of the electrically connecting pads, wherein a width of the electrically conductive layer is smaller than that of the electrically connecting pads, such that a ring of a top surface of each of the electrically connecting pads is not covered by the electrically conductive layer; and at least one copper bump formed on each of the electrically conductive layer, wherein a length of the copper bump is larger than a thickness of the electrically conductive layer; and a soldering material altogether wrapping the copper bump, the electrically conductive layer, the non-covered surface and sidewall of the electrically connecting pad in each of the openings.