Patent ID: 8578600

Claim:
A process for manufacturing a circuit board, comprising: providing a circuit substrate having a first surface and a first circuit layer; forming a dielectric layer on the circuit substrate, wherein the dielectric layer has a second surface and covers the first surface and the first circuit layer; illuminating the second surface of the dielectric layer with a laser beam to form at least a blind via extending from the second surface of the dielectric layer to the first circuit layer and an intaglio pattern extending from the second surface of the dielectric layer, wherein a depth of the blind via is greater than a depth of the intaglio pattern; forming a first conductive layer in a part of a blind via; and forming a second conductive layer in the intaglio pattern and in the rest of the blind via, wherein the second conductive layer covers the first conductive layer, and the second conductive layer is electrically connected to the first circuit layer through the first conductive layer.