Optical article having an abrasion and temperature resistant interferential coating with an optimized thickness ratio of low and high refractive index layers
US11397285B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2018 |
| Grant date | Jul 26, 2022 |
| Priority date | — |
| Expiry date | Apr 7, 2039 |
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 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 is higher than or equal to 2, the outermost high refractive index layer(s) of the interferential coating do(es) not comprise TiO2, and the outermost low refractive index layer(s) of the interferential coating is (are) deposited without ionic assistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.