Patent ID: 8318245

Claim:
A method for producing an optical article having antireflection or reflective properties, comprising: providing an optical article comprising a substrate having at least one main surface; depositing onto a main surface of the substrate a sub-layer having an exposed surface, said sub-layer comprising an SiO 2 -based layer including a thickness greater than or equal to 75 nm and lower than 250 nm, wherein the deposition of said SiO 2 -based layer is conducted without ion assistance by evaporation of SiO 2 in a vacuum chamber in which at least one supplementary gas is supplied during said deposition, under a pressure of 8.10 −5 to 2.10 −4 mbar, wherein said at least one supplementary gas comprises argon, krypton, xenon, neon, or nitrogen; depositing onto said exposed surface of the sub-layer a multilayered antireflection or reflective stack comprising at least one high refractive index layer and at least one low refractive index layer, recovering an optical article comprising a substrate having a main surface coated with an antireflection or a reflective coating comprising said sub-layer and said multilayered stack, wherein the exposed surface of the sub-layer has been submitted to an ionic bombardment treatment prior to depositing said multilayered stack, and wherein the deposition of the low refractive index layers of the multilayered stack is conducted in a vacuum chamber with no gas supply to the vacuum chamber during said coating deposition.