Patent ID: 8720053
Filing Date: 2014-05-13
Classification: H01L,H05K,Y02P,Y10T

Abstract:
1. A process of fabricating a circuit board, comprising: providing a circuit substrate, the circuit substrate comprising: a dielectric layer, having at least a through hole penetrating the circuit substrate and respectively connected to two opposite surfaces of the dielectric layer; a first patterned circuit layer, disposed on one of the two opposite surfaces of the dielectric layer; a second patterned circuit layer, disposed on the other one of the two opposite surfaces of the dielectric layer; and a first metal layer, covering a wall of the through hole, the first patterned circuit layer, and the second patterned circuit layer; forming a patterned mask on the first metal layer; forming a second metal layer covering a portion of the first metal layer; removing the patterned mask and exposing a portion of the first metal layer; and forming an insulation layer on the second metal layer, and a portion of the dielectric layer.