Patent ID: 7551356

Claim:
An anti-reflection structure comprising: convex portions arranged at a pitch shorter than a wavelength of visible light, each of the convex portions having a conic shape defined by an apex, a lateral surface, and a base, wherein assuming that a plane, which passes through the apex and is perpendicular to the base, provides a coordinate system in which an axis passing through the apex and being perpendicular to the base is defined as a Z axis, and in which an axis orthogonal to the Z axis at an intersecting point between the Z axis and the base is defined as an X axis, an intersecting line between the lateral surface and the plane passing through the apex and being perpendicular to the base, is equivalent to a curve expressed by: X =( D/ 2)×{1−( Z/H ) n }, in which H is a distance between the apex and the base, in which D is a diameter of a circle which adopts a distance between a point on the perimeter of the base and the Z axis as a radius, and in which 1<n≦3.