ANTIREFLECTION COATING

摘要

PURPOSE: To obtain an antireflection coating having high conductivity which enables fast mass production at a low cost. CONSTITUTION: An antireflection coating 10 formed on a PET film 13 as a base body is obtd. by forming four layers to satisfy the following conditions relating to a wavelength λ0 in the wavelength region of light that the material of the antireflection coating 10 hardly absorbs. The first layer 1 has a refractive index smaller than the refractive index of the PET film 13 and has about 0.5λ0 optical thickness. The second layer 2 has a refractive index smaller than the refractive index of the third layer 3 and has an optical thickness larger than about 0.25λ0 . The third layer 3 has a refractive index larger than about 2.2 and has an optical thickness smaller than about 0.25λ0 . The fourth layer 4 has a refractive index smaller than the refractive index of the PET film 13 and has about 0.25λ0 optical thickness.