METHOD FOR FORMING ANODIZED LAYER, METHOD FOR PRODUCING MOLD, METHOD FOR PRODUCING ANTIREFLECTIVE FILM, AND MOLD AND ANTIREFLECTIVE FILM

摘要

An anodized layer formation method of the present invention includes the steps of: (a) providing an aluminum base (10) which has a surface (18s) that is made of aluminum; (b) anodizing the surface (18s) to form a barrier-type alumina layer (12); and (c) after step (b), further anodizing the surface (18s) to form a porous alumina layer (14) which has a plurality of minute recessed portions (14p). According to the present invention, a method is provided that enables formation of a porous alumina layer which has an interpore distance of a desired magnitude with the use of an aluminum base which has a surface that is made of aluminum, irrespective of the surface form.