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

Claim 8:
9. 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.