Patent ID: 8294041
Filing Date: 2012-10-23
Classification: H05K,Y10T

Abstract:
1. A circuit board, comprising: a first dielectric layer, comprising a first surface and a second surface opposite to the first surface, wherein at least one first trench is embedded into the first dielectric layer from the first surface, and the at least one first trench does not reach the second surface; a first circuit layer, formed on an inside wall of the first trench; a second dielectric layer, disposed in the first trench, and covering the first circuit layer; and a second circuit layer, disposed in the first trench and exposed from the first surface of the first dielectric layer, wherein the second dielectric layer is located between the first circuit layer and the second circuit layer, and a top surface of the first circuit layer and a top surface of the second circuit layer are substantially coplanar with the first surface of the first dielectric layer.