Optical Article Having an Abrasion and Temperature Resistant Interferential Coating with an Optimized Thickness Ratio of Low and High Refractive Index Layers

摘要

The invention relates to an optical article comprising a substrate having at least one main face successively coated with a monolayer sub-layer having a thickness higher than or equal to 100 nm, a multilayer interferential coating comprising a stack of at least one high refractive index layer having a refractive index higher than 1.55 and at least one low refractive index layer having a refractive index of 1.55 or less, wherein the ratio is higher than or equal to 2, the outermost high refractive index layer(s) of the interferential coating do(es) not comprise TiO₂, and the outermost low refractive index layer(s) of the interferential coating is (are) deposited without ionic assistance.; $$ R_D=\frac{\begin{array}{c}\mathrm{thickness}\mathrm{of}\mathrm{the}\mathrm{outermost}\mathrm{low}\mathrm{refractive}\mathrm{index}\\ \mathrm{layer}\left(s\right)\mathrm{of}\mathrm{the}\mathrm{interferential}\mathrm{coating}\end{array}}{\begin{array}{c}\mathrm{thickness}\mathrm{of}\mathrm{the}\mathrm{outermost}\mathrm{high}\mathrm{refractive}\mathrm{index}\\ \mathrm{layer}\left(s\right)\mathrm{of}\mathrm{the}\mathrm{interferential}\mathrm{coating}\end{array}}$$