Patent ID: 11906700
Assignee: SCHOTT AG
Field: Surface technology, coating (Chemistry)
Classification: CPC G  C  H | IPC C  G  H

Claim 19:
20. A coated glass ceramic substrate comprising:
a glass ceramic substrate; and
a multilayer antireflection coating on at least one side of the glass ceramic substrate,
the multilayer antireflection coating comprising layers having a higher refractive index alternated with layers having a lower refractive index,
wherein the layers having a lower refractive index are formed of silicon oxide with a proportion of aluminum and have a first ratio of an amount of aluminum to an amount of silicon that is greater than 0.05, but with the amount of silicon being predominant relative to the amount of aluminum,
wherein the layers having the higher refractive index include a material selected from the group consisting of a silicide, an oxide, and a nitride, and
wherein the multilayer antireflection coating has an upper surface with an average roughness and a root mean squared roughness of less than 1.5 nm each, based on an area of one square micrometer.