METAL MASK AND METHOD FOR MANUFACTURING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a metal mask effective for forming a sputtering film having a thick film thickness achieving high capacity when a foil-shaped porous valve metal anodic body suitable as an anodic body of a thin type solid electrolytic capacitor is manufactured.SOLUTION: The sputtering metal mask is a plate material made of metal which includes penetrated aperture parts having nearly rectangular and similar aperture shapes and which has an overhanging part formed by a wall of the aperture part at an end of the aperture part of a plane having the aperture shape having the smaller similitude ratio, wherein a plane having the aperture shape having the larger similitude ratio is on the side in contact with a material to be sputtered.