Patent ID: 9572250
Date: 2017-02-14
CPC Classifications: H05K

Claim:
1. A printed circuit board comprising: a first insulating layer; a second insulating layer below the first insulating layer; a via formed through the first insulating layer and the second insulating layer; an inner circuit layer on the second insulating layer and buried in the first insulating layer; and an outer circuit layer on a top surface of the first insulating layer or a bottom surface of the second insulating layer; wherein the via includes: a first part, a second part below the first part, a third part between the first and second parts, a first barrier layer between the first part and the third part, and a second barrier layer between the third part and the second part; wherein a side surface of the third part of the via has a first predetermined inclination angle with respect to a top surface of the first insulating layer; wherein the inner circuit layer includes: a third barrier layer on the second insulating layer and horizontally spaced apart from the via, and an inner circuit pattern on the third barrier layer and horizontally spaced apart from the via; wherein a bottom surface of the third barrier layer is at a same level as a top surface of the second part; wherein the via has a hexagon sectional shape; wherein a shape of the third barrier layer is same as a shape of the second barrier layer, and a shape of the inner circuit pattern is same as a shape of the third part; and wherein the inner circuit pattern and the third barrier layer each has a trapezoid sectional shape.