Low index of refraction thin film with high hardness coating and method and apparatus to produce same

Abstract

A coated article comprising: a transparent substrate and a protective coating comprising: an adhesion layer formed over the substrate; a protective layer formed over the adhesion layer and may have refractive index of from 1.6 to 1.8; and an anti-reflective layer formed over the protective layer, the anti-reflective layer comprises a plurality of sublayers, wherein at least one sublayer has a refractive index higher than index of said protective layer and at least one sublayer has a refractive index lower than the index of said protective layer.

Dependencies are inferred from the claim text.