| 摘要 |
PURPOSE:To apply antireflection coating of a single layer thin film having an enough antireflection effect without giving colors to transmitted light. CONSTITUTION:Both surfaces of a transparent base body 3 are coated with a material having lower refractive index than the transparent base body 3 to form low refractive index thin film layers 1, 2 for antireflection having different film thicknesses from each other. The refractive indices n1, n2 and geometric film thicknesses d1, d2 of the low refractive index film layers 1, 2, respectively, and designed standard wavelength lambda0 satisfy the relation of optical film thickness 0.167lambda0<=n1d1<=0.188lambda0, and 0.259lambda0<=n2d2<=0.278lambda0. |
