Patent ID: 8217278
Filing Date: 2012-07-10
Classification: H05K,Y10T

Abstract:
1. An embedded wiring board comprising: an upper wiring layer which includes an upper pad; a lower wiring layer which includes a lower pad; an insulation layer which is provided with an upper surface and a lower surface opposite to the upper surface, with the upper wiring layer being located at the upper surface, the lower wiring layer being located at the lower surface, the upper pad being embedded in the upper surface and the lower pad being embedded in the lower surface; a first conductive pillar which is located in the insulation layer and is provided with an end surface exposed by the upper surface, with a height of the first conductive pillar relative to the upper surface being larger than a depth of the upper pad relative to the upper surface; and a second conductive pillar which is located in the insulation layer and is connected between the first conductive pillar and the lower pad, wherein the second conductive pillar has a top surface, the first conductive pillar has a bottom surface, the top surface is physically connected to the bottom surface, the top surface is not higher than the bottom surface, and an outer diameter of the top surface is smaller than an outer diameter of the bottom surface.