Patent ID: 9706652
Date: 2017-07-11
CPC Classifications: H05K

Claim:
1. A printed circuit board, comprising: an insulating layer; at least one circuit pattern or pad formed on the insulating layer; a solder resist having an opening section exposing an upper surface of the at least one circuit pattern or pad and formed on the insulating layer; a seed layer formed at a side surface of the solder resist exposing the upper surface of the at least one circuit pattern or pad, and protruded over a surface of the solder resist; and a bump formed on the pad exposed through the opening section of the solder resist and seed layer, and protruded over the surface of the solder resist; wherein the seed layer is disposed between the side surface of the solder resist and a side surface of the bump, wherein the seed layer has an upper surface and a lower surface opposite to the upper surface, wherein an area of the upper surface of the seed layer is the same as that of the lower surface of the seed layer, wherein a height of the seed layer is the same as a height of the bump, wherein the upper surface of the protruded seed layer lies in a same plane as an upper surface of the protruded bump, wherein the bump comprises: wherein an upper surface of the first bump is higher than the upper surface of the solder resist, wherein the seed layer is contacted with side surfaces of the first bump and the second bump, wherein an area of an upper surface of the first bump is the same as that of a lower surface of the first bump, wherein an area of an upper surface of the second bump is the same as that of a lower surface of the second bump, and wherein the area of the upper surface of the first bump is the same as that of the upper surface of the second bump.