Patent ID: 8183689
Filing Date: 2012-05-22
Classification: H01L,H05K,Y02P

Abstract:
1. A printed circuit board comprising: an insulation layer; a first metal line formed on a first surface of the insulation layer, the first metal line comprising: a bump land at one end thereof; at least one projection which integrally extends from the bump land coplanar with the first metal line and along the first surface toward an edge of the insulation layer; a second metal line formed on a second surface of the insulation layer opposite the first surface; a via metal line electrically connecting the first and second metal lines; and solder resist formed at least over the first surface of the insulation layer and on the first metal line to expose the bump land, wherein the at least one projection has a length of 5 μm to 100 μm to minimize a difference in thermal expansion coefficient caused by a difference in bulk between one portion of the solder resist formed on the first metal line and another portion of the solder resist not formed on the first metal line.