Optical Article Comprising an Antireflective Coating with a Very Low Reflection in the Visible and Ultraviolet Regions
US-2017075040-A1 · Mar 16, 2017 · US
Optical article having an abrasion and temperature resistant interferential coating with an optimized thickness ratio of low and high refractive index layers
US11397285B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11397285-B2 |
| Application number | US-201816606075-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 18, 2018 |
| Priority date | Apr 18, 2017 |
| Publication date | Jul 26, 2022 |
| Grant date | Jul 26, 2022 |
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Abstract
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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 TiO 2 , and the outermost low refractive index layer(s) of the interferential coating is (are) deposited without ionic assistance. R D = thickness of the outermost low refractive index layer ( s ) of the interferential coating thickness of the outermost high refractive index layer ( s ) of the interferential coating
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The invention claimed is: 1. 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; and 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: R D = thickness of the outermost low refractive index layer ( s ) of the interferential coating thickness of the outermost high refractive index layer ( s ) of the interferential coating is higher than or equal to 2, the outermost high refractive index layer(s) of the interferential coating do(es) not comprise TiO 2 , and the outermost low refractive index layer(s) of the interferential coating is (are) deposited without ionic assistance; and wherein the high refractive index layers of the interferential coating have a refractive index lower than or equal to 2.2. 2. The optical article of claim 1 , wherein the ratio R D is higher than or equal to 2.25. 3. The optical article of claim 2 , wherein the ratio R D is higher than or equal to 2.5. 4. The optical article of claim 1 , wherein the sub-layer has a thickness higher than or equal to 120 nm. 5. The optical article of claim 1 , wherein the sub-layer is a SiO 2 -based layer. 6. The optical article of claim 1 , wherein the sub-layer is in direct contact with the interferential coating. 7. The optical article of claim 1 , wherein the deposition of the sub-layer is conducted in a vacuum chamber in which at least one supplementary gas is supplied during said deposition. 8. The optical article of claim 1 , wherein the residual color displayed by said interferential coating has a hue angle h ranging from 40° to 300°. 9. The optical article of claim 1 , wherein the high refractive index layers of the interferential coating comprise at least one material selected from Ta 2 O 5 , Nb 2 O 5 , PrTiO 3 , ZrO 2 and Y 2 O 3 . 10. The optical article of claim 1 , wherein the interferential coating does not comprise any layer comprising titanium oxide. 11. The optical article of claim 1 , wherein the interferential coating comprises at least one electrically conductive layer. 12. The optical article of claim 1 , wherein the interferential coating is an anti-reflection coating. 13. The optical article of claim 1 , wherein the sub-layer has a thickness lower than or equal to 355 nm. 14. The optical article of claim 1 , wherein the total thickness of the interferential coating plus the thickness of the sub-layer is lower than or equal to 500 nm. 15. The optical article of claim 1 , wherein the optical article is an ophthalmic lens. 16. A method of manufacturing the optical article of claim 1 , comprising: providing an optical article comprising a substrate having at least one main face; depositing onto a main surface of the substrate a sub-layer having an expo
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- What does patent US11397285B2 cover?
- 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 refract…
- Who is the assignee on this patent?
- Essilor Int
- What technology area does this patent fall under?
- Primary CPC classification G02B1/116. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jul 26 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).