abstract |
(57) [Summary] [Construction] In an antireflection article having four layers of antireflection layers, the refractive index n i and the optical film thickness d i of each layer are 0.2λ 0 ≦ n i · d. I met i ≦ 0.3λ 0, and anti-reflection article, characterized in that n i is in the range of below. 1.8 ≤ n 1 ≤ 2.0 2.3 ≤ n 2 ≤ 2.5 2.05 ≤ n 3 ≤ 2.25 1.3 ≤ n 4 ≤ 1.50 (where i is 1 to 4) , Which indicates the number of layers from the substrate side, and λ 0 represents the set wavelength.) [Effect] The antireflection article of the present invention has excellent antireflection performance. |