Patent ID: 8383956

Claim:
A multilayer printed circuit board comprising: an insulation layer having a plurality of openings; a first conductor layer provided on a first side of the insulation layer and having a thickness such that a top surface of the first conductor layer is above a surface of the first side of the insulation layer; a second conductor layer provided on a second side of the insulation layer, the second side being opposite to the first side; and a plurality of filled vias electrically connecting the first conductor layer and the second conductor layer, wherein each of the filled vias comprises: a plating material formed by electrically plating the plating material to fill a respective one of the plurality of openings in the insulation layer, and an upper surface of the plating material provided on a same level as said top surface of the first conductor layer and having a flatness such that a difference between a lowest point and a highest point of the upper surface is less than or equal to about 7 μm.