Die for moth-eye, and method for producing die for moth-eye and moth-eye structure
AssigneeSharp Kabushiki Kaisha
InventorsAkinobu Isurugi, Kiyoshi Minoura, Tokio Taguchi, Takao Imaoku
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Abstract
A mold of an embodiment of the present invention has a surface that has a shape which is inverse of a surface shape of a moth-eye structure. This surface has a plurality of protrusions, a plurality of ridges extending between the plurality of protrusions via saddle portions, and a plurality of holes, each of which is defined by at least any three of the plurality of protrusions and ridges extending between the at least any three of the plurality of protrusions, and an average distance between centers of adjacent holes, p, and an average depth of the saddle portions, r, satisfy the relationship of 0.15≦r/p≦0.60.
Claims8
A mold with a surface that has a shape which is inverse of a surface shape of a moth-eye structure, wherein
- the surface has a plurality of protrusions, a plurality of ridges extending between the plurality of protrusions via saddle portions, and a plurality of holes, each of which is defined by at least any three of the plurality of protrusions and ridges extending between the at least any three of the plurality of protrusions, and
- an average distance between centers of adjacent holes, p, and an average depth of the saddle portions, r, satisfy the relationship of 0.15≦r/p≦0.60.
A method of manufacturing a mold with a surface that has a shape which is inverse of a surface shape of a moth-eye structure, comprising the steps of:
- providing a base in which aluminum is provided over a surface;
- and
- forming a porous alumina layer by performing an anodization and an etching on the aluminum, the porous alumina layer having a surface that has a plurality of protrusions, a plurality of ridges extending between the plurality of protrusions via saddle portions, and a plurality of holes, each of which is defined by at least any three of the plurality of protrusions and ridges extending between the at least any three of the plurality of protrusions,
- wherein in the step of forming the porous alumina layer, an average distance between centers of adjacent holes, p, and an average depth of the saddle portions, r, satisfy the relationship of 0.15≦r/p≦0.60.
Dependencies are inferred from the claim text.