Patent ID: 6150061
Filing Date: 2000-11-21
Classification: H05K

Abstract:
A method for forming a solder mask on a surface of a printed circuit board, wherein the solder mask includes openings formed around of each of a plurality of lands, and wherein a barrier having a minimum width is required to exist between adjacent lands, comprising:providing at least one through-hole proximate at least one surface land;applying a photosensitive dielectric material over the printed circuit board;providing an opening in said photosensitive dielectric material, said opening having a non-circular shape, at least one outwardly extending region that provides additional clearance of the photosensitive dielectric material around the through-hole, and an inwardly extending region across from an adjacent land, the inwardly extending region oriented to maintain a barrier of photosensitive dielectric material between the through-hole and the adjacent surface land; andcuring the photosensitive dielectric material around the perimeter of each land.