Patent ID: 7707715

Claim:
A method of fabricating a multilayer printed circuit board, comprising: a) forming a first metal plating layer on a first metal carrier, and then forming a first circuit pattern on the first metal plating layer, thus preparing a first substrate; b) forming a second metal plating layer on a second metal carrier, and then forming a second circuit pattern on the second metal plating layer, thus preparing a second substrate; c) interposing a first insulating material between the first circuit pattern of the first substrate and the second circuit pattern of the second substrate, laminating the first substrate, the first insulating material and the second substrate, and then removing the second metal carrier and the second metal plating layer from the second substrate; d) forming a via hole to expose an upper surface of the first circuit pattern; e) forming an electroless copper plating layer on an inner wall of the via hole, the first circuit pattern, and the second circuit pattern, and then filling the via hole; f) applying a photosensitive material on the electroless copper plating layer, and then removing a portion of the photosensitive material corresponding to a connection plating layer; g) sequentially forming a copper electroplating layer and a connection plating layer on the electroless copper plating exposed by removing the portion of the photosensitive material, and then removing the electroless plating layer; h) interposing a second insulating material between a connection plating layer of a third substrate formed through the a) to the g) and a second circuit pattern of a fourth substrate formed through the a) to the e), and then laminating the third substrate, the second insulating material and the fourth substrate, thus connecting the connection plating layer of the third substrate to the second circuit pattern of the fourth substrate; and i) sequentially removing the first metal carrier and the first metal plating layer from the third substrate and the fourth substrate.