Stamper, article and method for manufacturing the same
The invention relates to a stamper in which an oxide film having a fine concave-convex structure made up of a plurality of fine pores having an aspect ratio represented by [the depth of the fine pores/the average interval between the fine pores] of 1 to 4 is formed on the surface of an aluminum base material which is made of aluminum having a content of Ti of 150 ppm to 500 ppm, a content of B or C of 1 ppm to 50 ppm and a purity of 99.9% or more. According to the invention, it is possible to provide a low-cost stamper in which the emergence of a pattern derived from the traces of crystal grains on the surface of the oxide film is suppressed, an article having a favorable appearance, which is manufactured using the above stamper, and a method for manufacturing the above.
1. A stamper,
wherein an oxide film having a fine concave-convex structure made up of a plurality of fine pores having an aspect ratio represented by [a depth of the fine pore/an average interval between the fine pores] of 1 to 4 is formed on a surface of an aluminum prototype, which is made of aluminum having a content of Ti of 100 ppm to 500 ppm, a content of B or C of 1 ppm to 50 ppm and a purity of 99.9% or more, and has an average crystal grain diameter of 1 mm or less.
2. The stamper according to claim 1 ,
wherein the content of Fe is 200 ppm or less.
3. The stamper according to claim 1 , comprising a metallic structure of which the average crystal grain diameter is 70 μm or less.