Simple process for anti-reflection coating with multiple metal films

摘要

An anti-reflection screen filter is provided that includes four consecutively applied layers to a substrate. A first layer, furthest from the substrate, is arranged on an underlying second layer and comprises an oxide material having a refractive index within the approximating range of 1.46 to 1.50 at a wavelength of 520 nm. The second layer is arranged on an underlying third layer and is formed by a metal having a refractive index within the approximating range of 1.5 to 4.0 at a wavelength of 520 nm. The third layer is arranged on an underlying fourth layer and is formed by a metal having a refractive index within the approximating range of 0.2 to 1.4 at a wavelength of 520 nm. The fourth layer is disposed on the front surface of a substrate and is formed by a metal having a refractive index within the approximating range of 1.5 to 4.0 at a wavelength of 520 nm.