Patent ID: 11960057
Assignee: HOYA OPTICAL LABS OF AMERICA, INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. 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.