Patent ID: 9138936
Filing Date: 2015-09-22
Classification: B21J,B22D,B29C,B29K,C22C,C22F,C25D,G02B,G11B,Y10T

Abstract:
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.