Patent ID: 7707716

Claim:
A method of manufacturing a build-up printed circuit board comprising a core layer and an outer layer, the core layer being manufactured by: providing a first resin substrate having metal layers laminated on two surfaces thereof; removing the metal layers from the two surfaces of the first resin substrate through a full-etching process so that a surface roughness of the two surfaces is less than 0.8 μm; forming a through hole for interlayer electrical connection in the first resin substrate, having no metal layers; subjecting the first resin substrate having the through hole to surface treatment using ion beams so that a peel strength of the first resin substrate is greater than 0.8 Kgf/cm; forming a first metal seed layer on the first resin substrate which is surface treated, using vacuum deposition; forming a first metal pattern plating layer on the substrate having the first metal seed layer using electroplating; removing a portion of the first metal seed layer, having no first metal pattern plating layer; and filling the through hole with a conductive paste, thus forming a core circuit layer having a pitch not larger than 40 μm.