JP2008203473A5 - - Google Patents

Claims (9)

An antireflection structure comprising a base material in which pyramidal protrusions are arranged innumerably at a pitch of 50 nm or more and less than 380 nm and a low refractive index layer made of a material having a refractive index smaller than that of the base material,
An antireflection structure, wherein the low refractive index layer is laminated at least in the vicinity of the apex of the cone-shaped protrusion. 2. The antireflection structure according to claim 1, wherein the cone-shaped protrusion has a circular or polygonal bottom surface, and the diameter of the circular bottom surface or the diameter of a circle circumscribing the polygonal bottom surface is not less than 50 nm and less than 380 nm. . The low refractive index layer is laminated in a height range of at least 0.2H from the apex of the cone-shaped protrusion, where H is the height of the cone-shaped protrusion. The antireflection structure as described. The low refractive index layer has a multilayer structure made of a plurality of materials having different refractive indexes, and the layers are laminated so that the refractive index of each layer increases stepwise from the surface side toward the substrate. The antireflection structure according to any one of claims 1 to 3. 5. The antireflection structure according to claim 1, wherein a height H of the cone-shaped protrusion is 50 to 1500 nm. A line including the tip of the fine protrusion and connecting the tip and the outer periphery of the bottom in a cross section perpendicular to the bottom is represented by the line form shown in the following formula (1), and the order n is 1.1 to 5: The antireflection structure according to any one of claims 2 to 5.
Z = {H / (D / 2) ⁿ } × X ⁿ   ... (1) An antireflection structure comprising the antireflection structure according to any one of claims 1 to 6. An antireflection structure comprising the antireflection structure according to any one of claims 1 to 6 on at least one surface of a substrate. An automobile member comprising the antireflection structure according to claim 7.