Method for forming concave-convex pattern and apparatus for preparing concave-convex pattern

A method for forming a concave-convex pattern comprising of the steps (1) to (4):

• a step (1) of placing a stamper having a fine concave-convex pattern surface thereon on a photo-curable transfer layer of a photo-curable transfer sheet, the photo-curable transfer sheet comprising a transparent film and the photo-curable transfer layer thereon, such that the concave-convex pattern surface of the stamper is in contact with a surface of the photo-curable transfer layer, and depressing the stamper and the photo-curable transfer sheet to form a laminate in which one side of the photo-curable transfer layer adheres closely to the concave-convex pattern surface;
• a step (2) of exposing the photo-curable transfer layer of the laminate having the stamper to ultraviolet rays to cure the photo-curable transfer layer, and removing the stamper from the laminate to form an inverted pattern of the fine concave-convex pattern on a surface of the photo-curable transfer layer, the photo-curable transfer sheet having the inverted fine concave-convex pattern surface being referred to as an intermediate stamper;
• a step (3) of placing the intermediate stamper on a photo-curable transfer layer of another photo-curable transfer sheet, the another photo-curable transfer sheet comprising a transparent film and the photo-curable transfer layer thereon, such that the inverted concave-convex pattern surface of the intermediate stamper is in contact with a surface of the photo-curable transfer layer of the another photo-curable transfer sheet and depressing the intermediate stamper and the another photo-curable transfer sheet to form a laminate in which one side of the another photo-curable transfer layer adheres closely to the inverted concave-convex pattern surface;
• and
• a step (4) of exposing the photo-curable transfer layer of the laminate having the intermediate stamper to ultraviolet rays to cure the photo-curable transfer layer, and removing the intermediate stamper from the laminate to form a fine concave-convex pattern on a surface of the photo-curable transfer layer, the fine concave-convex pattern being the same as that of the stamper, whereby the photo-curable transfer sheet having the fine concave-convex pattern surface is obtained.