Optical article having a temperature-resistant anti-reflection coating with optimized thickness ratio of low index and high index layers
US7692855B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2006 |
| Grant date | Apr 6, 2010 |
| Priority date | — |
| Expiry date | Jan 22, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/116
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to an optical article having anti-reflection properties and high thermal resistance, comprising a substrate having at least one main face coated with a multi-layer anti-reflection coating comprising a stack of at least one high refractive index layer and at least one low refractive index layer, wherein the ratio:is higher than 2.1. If the anti-reflection stack comprises at least one low refractive index layer having a physical thickness ≧100 nm which is not the outermost layer of the anti-reflection coating, said relatively thick layer and the underlying layers are not taken into account in RT calculation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.