Patent ID: 9686860
Date: 2017-06-20
CPC Classifications: C25D,H05K

Claim:
1. A printed circuit board comprising: an insulating layer; a circuit pattern on the insulating layer; and a surface treatment layer on the circuit pattern, wherein the surface treatment layer includes a bottom surface having a width wider than a width of a top surface of the circuit pattern, wherein the bottom surface of the surface treatment layer comprises: a first portion contacting with the top surface of the circuit pattern; and a second portion spaced apart from the insulating layer and the circuit pattern by a predetermined distance, wherein the width of the top surface of the circuit pattern is narrower than a width of a bottom surface of the circuit pattern, and the bottom surface of the circuit pattern comprises a first area vertically overlapped with the top surface of the circuit pattern and a second area except for the first area, wherein the second area of the circuit pattern comprises: a third area that is not vertically overlapped with the second portion of the surface treatment layer; and a fourth area vertically overlapped with the second portion of the surface treatment layer, and wherein the third area has a width wider than a width of the fourth area.