Patent ID: 7940462
Filing Date: 2011-05-10
Classification: G02B,Y10T

Abstract:
1. An antireflective structure comprising: a substantially flat layer having a surface; a fine structure layer including: wherein, with a first reflective face formed in the head end part of each of the truncated fine protrusions, and a second reflective face formed between the truncated fine protrusions on the surface of the flat layer: a ratio is in a range of 0.2 to 2, where the ratio is given by dividing: a height H of each of the fine protrusions is given by the following expression (1): where n denotes an average refractive index of parts forming the fine protrusions and A denotes an arbitrary value in a range of 0.6 to 1.4, each of the diameter D of the circle and the diameter D of the circumscribing circle is less than or equal to 380 nm, the pitch is less than or equal to 380 nm, and the height H of each of the fine protrusions is in a range of 160 nm to 350 nm.