Patent No. U.S. 6,528,142 B2
Yazaki Corporation has received a patent for an anti-reflective coating comprising a transparent substrate layer has a refractive index Ns. The first layer having a refractive index N1 lower than Ns and formed over the substrate layer. The second layer has a refractive index N2 higher than N1, but lower than Ns, and formed over the first layer. A light scattering region provided between the substrate layer and the second layer, which has heterogeneities causing the light scattering. The heterogeneities have an average size that is less than each of the thicknesses of the first and the second layers, and the scattering region is provided as a roughened surface of the first layer in contact with the substrate layer.