Optical article and method for producing optical article

摘要

An optical article includes an antireflection coating formed on an optical base material either directly or via some other layer. The antireflection coating is configured from alternately laminated n + 1 low-refractive-index layers and n high-refractive-index layers (where n is an integer of 2 or more). At least one of the n high-refractive-index layers is a first-type layer formed by vapor deposition using only a first deposition source that includes zirconium oxide as the main component. The remaining layer(s) in the n high-refractive-index layers is a second-type layer(s) formed by vapor deposition using only a second deposition source that includes titanium oxide as the main component. The n + 1 low-refractive-index layers are third-type layers formed by vapor deposition using only a third deposition source that includes silicon oxide as the main component. The proportion of the total thickness of the second-type layer(s) in the total thickness of the n high-refractive-index layers is from 15% to 90%.