Patent ID: 7858885

Claim:
A circuit board structure, comprising: a carrier board having a first surface and a second surface opposed to the first surface, the carrier board having at least a through hole penetrating the first and second surfaces; an electroplating-formed conductive pillar completely filling the through hole, wherein surfaces of two ends of the conductive pillar are flush with the first and second surfaces of the carrier board; a first circuit layer and a second circuit layer respectively formed on the first and second surfaces of the carrier board and a part of surface, from side to interior thereof, of each of the two ends of the electroplating-formed conductive pillar, the width of circuits of the first and second circuit layers electrically connected to the partial surfaces of the ends of the electroplating-formed conductive pillar being smaller than a diameter of the at least a through hole; and a conductive layer formed between the first surface and the first circuit layer, between the second surface and the second circuit layer, and between the two ends of the electroplating-formed conductive pillar and the first and second circuit layers, wherein each of the first and second circuit layers has the same pattern as the conductive layer.