Hydrophilic-like sputtered AR coating
AssigneeHOYA Optical Labs of America, Inc.
InventorsMichael Marshall, Jeffrey Brown
Life of this patent
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Abstract
An ophthalmic article having a coating system which provides antireflective and easy clean properties to the ophthalmic article. The coating system includes alternating layers of low refractive index metal oxide and high refractive index metal oxynitrides and corresponding high refractive index metal oxides. The coating system provides favorable surface energy to the ophthalmic article when at least one layer of the high refractive index metal oxynitride is encapsulated between two layers of low refractive index metal oxide.
Claims16
An ophthalmic article having easy-clean and anti-reflective properties comprising:
- a substrate having a surface;
- and
- a stack on said surface;
- said stack comprising a plurality of alternating low refractive index layers comprising a metal oxide and high refractive index layers comprising 1) at least one metal oxynitride layer, or 2) at least one metal oxynitride layer and at least one metal oxide layer;
- wherein the ophthalmic article comprises a surface free energy in a range of about 50-70 mN/m for a prolonged period when the at least one high refractive index metal oxynitride layer is encapsulated between two layers of the low refractive index metal oxide;
- wherein the at least one high refractive index metal oxynitride layer comprises a titanium oxynitride layer or a zirconium oxynitride layer.
An optical stack that imparts easy-cleaning and anti-reflective properties on a surface comprising:
- at least one high refractive index layer of a metal oxynitride encapsulated between two low refractive index layers of metal oxide material;
- wherein a surface free energy of the optical stack, comprising the high refractive index layer of the metal oxynitride encapsulated between the two low refractive index layers of the metal oxide material, remains in a range of about 50-70 mN/m for a prolonged period;
- wherein the at least one high refractive index layer of the metal oxynitride comprises a titanium oxynitride layer or a zirconium oxynitride layer.
Dependencies are inferred from the claim text.