Patent ID: 8248699
Filing Date: 2012-08-21
Classification: G02B,Y10T

Abstract:
1. A reflection reducing film comprising: a reflection reducing layer that is provided on a substrate and includes first to eighth layers sequentially laminated from the opposite side to the substrate; wherein the first and sixth layers are made of a low-refractive index material having a refractive index equal to or higher than 1.35 and equal to or lower than 1.50 at the d-line, the third, fifth and seventh layers are made of an intermediate-refractive index material having a refractive index equal to or higher than 1.55 and equal to or lower than 1.85 at the d-line, and the second, fourth and eighth layers are made of a high-refractive index material having a refractive index higher than that of the intermediate-refractive index material in the range of 1.70 to 2.50 at the wherein all the following conditional expressions (1) to (8) are satisfied: where λ0 denotes a center wavelength, N1 to N8 denote refractive indices of the first to eighth layers at the center wavelength λ0, and d1 to d8 denote physical film thicknesses of the first to eighth layers.