Patent ID: 8357861
Filing Date: 2013-01-22
Classification: H01L,H05K

Abstract:
1. A circuit board, comprising: a substrate, having a through hole, wherein the substrate comprises an insulating layer, a patterned first metal layer and a patterned second metal layer, the insulating layer has a first surface and a second surface opposite thereto, the patterned first metal layer and the patterned second metal layer are respectively disposed on the first surface and the second surface, and the through hole penetrates the insulating layer, the patterned first metal layer and the patterned second metal layer; a patterned first conductive layer, disposed on the patterned first metal layer, the patterned second metal layer and an inner wall of the through hole; a patterned second conductive layer, disposed on the patterned first conductive layer, wherein the patterned first metal layer, the patterned second metal layer, the patterned first conductive layer and the patterned second conductive layer form a plurality of first conductive traces, a plurality of second conductive traces and a plurality of conductive channels, the conductive channels are located on the inner wall of the through hole and are electrically isolated from one another, the first conductive traces are located on the first surface, the second conductive traces are located on the second surface, and each conductive channel is connected between the corresponding first conductive trace and the corresponding second conductive trace, wherein the insulating layer has a plurality of trenches therein and every two of the conductive channels is separated by one corresponding trench, and each trench extends only from the first surface of the insulating layer to the second surface of the insulating layer; a first solder mask layer, covering at least a portion of the first conductive traces; and a second solder mask layer, covering at least a portion of the second conductive traces.