Patent ID: 8729406

Claim:
A method of fabricating a printed circuit board, comprising: (A) sequentially forming a release layer and an insulating member on a carrier, and then processing a pattern trench in the insulating member and a bump pad trench passing through the insulating member and the release layer using an imprinting process, wherein the release layer is formed of a resin material; (B) performing plating in the pattern trench and the bump pad trench, thus forming a circuit pattern disposed in the insulating member and a bump pad disposed on the insulating member and the release layer; (C) forming a build-up insulating layer on the insulating member, and then forming a circuit layer having a via for interlayer connection; and (D) forming a solder resist layer on the build-up insulating layer, and then sequentially removing the carrier and the release layer from the insulating member so that the lower part of the bump pad is impregnated inside of the insulating member and upper part of the bump pad is protruded from the insulating member.