Patent ID: 8166652

Claim:
A process for manufacturing a circuit structure of a circuit board, the process comprising: providing a dielectric layer having a surface; irradiating a portion of the surface of the dielectric layer with use of a laser beam, so as to form an intaglio pattern; forming a deposition layer on the surface of the dielectric layer, the deposition layer covering an inner wall of the intaglio pattern, wherein a method of forming the deposition layer comprises performing a sputtering process, an inkjet printing process or a chemical deposition plating; performing an electroplating process to form a metal layer on the deposition layer, wherein the metal layer covers the deposition layer; and performing a photolithography and etching process to form a plurality of first circuits and a plurality of second circuits, wherein the first circuits are disposed on the surface of the dielectric layer, the second circuits are disposed in the intaglio pattern of the dielectric layer, line widths of the second circuits are smaller than line width of the first circuits, and a distance between every two of the adjacent second circuits is shorter than a distance between every two of the adjacent first circuits.