Optical article having an interferential coating with an improved abrasion-resistance
US12092908B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2019 |
| Grant date | Sep 17, 2024 |
| Priority date | — |
| Expiry date | Aug 14, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/022
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to an optical article comprising a substrate having at least one main face successively coated with a layer comprising chromium, silicon and oxygen, a monolayer sub-layer having a thickness higher than or equal to 100 nm, a multilayer interferential coating comprising a stack of at least one high refractive index layer having a refractive index higher than 1.55 and at least one low refractive index layer having a refractive index of 1.55 or less, wherein the ratio (I) is higher than or equal to 1.5, and the optical article has a Bayer value determined in accordance with the ASTM F735-81 standard higher than or equal to 7.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.