Patent ID: 9127371
Filing Date: 2015-09-08
Classification: C25D,G02B,Y10T

Abstract:
1. A method of fabricating a mold that has an inverted moth-eye structure in its surface, the inverted moth-eye structure having a plurality of recessed portions whose two-dimensional size viewed in a direction normal to the surface is not less than 50 nm and less than 500 nm, the method comprising the steps of: (a) anodizing a surface of an aluminum base to form a porous alumina layer which has a plurality of minute recessed portions; (b) after step (a), bringing the porous alumina layer into contact with an etching solution, thereby enlarging the plurality of minute recessed portions of the porous alumina layer; and (c) after step (b), further anodizing the surface of the aluminum base to grow the plurality of minute recessed portions, wherein a voltage applied in step (c) is higher than a voltage applied in step (a).