Patent ID: 8329069
Filing Date: 2012-12-11
Classification: B29C,C25D,G02B

Abstract:
1. A method of fabricating a mold that is for use in forming a motheye structure over a surface, the motheye structure including a plurality of first raised portions each having a two-dimensional size of not less than 10 nm and less than 500 nm when seen in a direction normal to the surface, the method comprising the steps of: (a) preparing an Al base in which an Al content is less than 99.99 mass %; (b) partially anodizing the Al base to form a porous alumina layer which has a plurality of very small recessed portions; (c) after step (b), allowing the porous alumina layer to be in contact with an etchant which contains an anodic inhibitor, thereby enlarging the plurality of very small recessed portions of the porous alumina layer; and (d) after step (c), further anodizing the Al base to grow the plurality of very small recessed portions, wherein the Al base contains not more than 10 ppm of an element whose standard electrode potential is higher than Al and not less than 0.1 mass % of an element whose standard electrode potential is lower than Al, and wherein before step (c), forming an additional barrier layer of alumina formed under the porous alumina layer.