Optical article comprising an interference coating with high reflectivity in the ultraviolet region

Patent metadata

Field	Value
Publication number	US-10288905-B2
Application number	US-201515539037-A
Country	US
Kind code	B2
Filing date	Dec 18, 2015
Priority date	Dec 24, 2014
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

The present invention relates to a transparent ophthalmic lens comprising a substrate having a main front face and a main rear face, said main front face being coated with a multilayer interference coating, preferably an anti-reflection coating, comprising a stack of at least one layer have a refractive index greater than 1.6 and at least one layer having a refractive index less than 1.55, characterized in that:
the mean reflection factor on said main front face coated with said interference coating, between 350 nm and a wavelength between 380 and 400 nm, preferably between 350 and 380 nm, weighted by the function W(I), is greater than or equal to 35% for at least one angle of incidence between 0° and 17°; the light reflection factor at 400 nm on said main front face coated with said interference coating is less than or equal to 35% for at least one angle of incidence between 0° and 17°.

First claim

The invention claimed is:

1. A transparent ophthalmic lens comprising a substrate having a front main face and a back main face, said front main face being coated with a multilayer interference coating comprising a stack of at least one layer having a refractive index higher than 1.6, called the high-refractive-index layer, and of at least one layer having a refractive index lower than 1.55, called the low-refractive-index layer, and which does not contain titanium, wherein:
the average reflectance of said coated front main face of said interference coating, between 350 nm and a wavelength comprised between 380 and 400 nm, weighted by the function W(λ), is higher than or equal to 50% at at least one angle of incidence comprised between 0° and 17°; and
the light reflectance at 400 nm of said coated front main face of said interference coating is lower than or equal to 35% at at least one angle of incidence comprised between 0° and 17°.

2. The ophthalmic lens of claim 1 , wherein said multilayer interference coating is an antireflection coating.

3. The ophthalmic lens of claim 1 , wherein the average reflectance of said coated front main face of said interference coating, between 350 nm and a wavelength comprised between 350 and 380 nm, weighted by the function W(λ), is higher than or equal to 50% at at least one angle of incidence comprised between 0° and 17°.

4. The ophthalmic lens of claim 1 , wherein said average reflectance of said front main face between 350 nm and a wavelength comprised between 380 and 400 nm is higher than or equal to 65% at at least one angle of incidence comprised between 0° and 17°.

5. The ophthalmic lens of claim 1 , wherein the light reflectance at 400 nm of said coated front main face of said interference coating is lower than or equal to 25% at at least one angle of incidence comprised between 0° and 17°.

6. The ophthalmic lens of claim 5 , wherein the light reflectance at 400 nm of said coated front main face of said interference coating is lower than or equal to 15% at at least one angle of incidence comprised between 0° and 17°.

7. The ophthalmic lens of claim 1 , wherein said multilayer interference coating comprises a number of layers higher than or equal to 3 and a number of layers lower than or equal to 10.

8. The ophthalmic lens of claim 7 , wherein said multilayer interference coating comprises a number of layers higher than or equal to 4 and a number of layers lower than or equal to 8.

9. The ophthalmic lens of claim 8 , wherein said multilayer interference coating comprises a number of layers higher than or equal to 6 and a number of layers lower than or equal to 8.

10. The ophthalmic lens of claim 1 , wherein the one or more high-refractive-index layers of the multilayer interference coating have a refractive index higher than or equal to 1.8.

11. The ophthalmic lens of claim 10 , wherein the one or more high-refractive-index layers of the multilayer interference coating have a refractive index higher than or equal to 1.9.

12. The ophthalmic lens of claim 1 , wherein the light reflected from said coated front main face of said interference coating has a chroma C* lower than or equal to 15 at at least one angle of incidence comprised between 0° and 17°.

13. The ophthalmic lens of claim 12 , wherein the light reflected from said coated front main face of said interference coating has a chroma C* lower than or equal to 10 at at least one angle of incidence comprised between 0° and 17°.

14. The ophthalmic lens of claim 1 , wherein the substrate has a transmittance T higher than or equal to 1% at a wavelength located between 350 nm and 400 nm.

15. The ophthalmic lens of claim 1 , wherein the reflectance in the visible Rv between 380 nm and 780 nm of said coated front main face of said interference coating is lower than or equal to 3%.

16. The ophthalmic lens of claim 15 , wherein the reflectance in the visible Rv between 380 nm and 780 nm of said coated front main face of said interference coating is lower than or equal to 1.5%.

17. The ophthalmic lens of claim 1 , wherein the interference coating comprises, in order starting from the substrate:
a high-refractive-index layer having a refractive index higher than 1.6 of 15 to 39 nm thickness;
a low-refractive-index layer having a refractive index lower than 1.55 of 26 to 62 nm thickness;
a high-refractive-index layer having a refractive index higher than 1.6 of 24 to 63 nm thickness;
a low-refractive-index layer having a refractive index lower than 1.55 of 52 to 81 nm thickness;
a high-refractive-index layer having a refractive index higher than 1.6 of 24 to 45 nm thickness;
a low-refractive-index layer having a refractive index lower than 1.55 of 27 to 64 nm thickness;
a high-refractive-index layer having a refractive index higher than 1.6 of 28 to 58 nm thickness;
a low-refractive-index layer having a refractive index lower than 1.55 of 84 to 116 nm thickness.

18. The ophthalmic lens of claim 17 , wherein the interference coating comprises, in order starting from the substrate:
a high-refractive-index layer having a refractive index higher than 1.6 of 15 to 35 nm thickness;
a low-refractive-index layer having a refractive index lower than 1.55 of 42 to 62 nm thickness;
a high-refractive-index layer having a refractive index higher than 1.6 of 24 to 44 nm thickness;
a low-refractive-index layer having a refractive index lower than 1.55 of 61 to 81 nm thickness;
a high-refractive-index layer having a refractive index higher than 1.6 of 25 to 45 nm thickness;
a low-refractive-index layer having a refractive index lower than 1.55 of 27 to 57 nm thickness;
a high-refractive-index layer having a refractive index higher than 1.6 of 30 to 58 nm thickness;
a low-refractive-index layer having a refractive index lower than 1.55 of 84 to 114 nm thickness.

19. The ophthalmic lens of claim 18 , wherein the interference coating further comprises an electrically conductive layer of 3 to 10 nm thickness between the a high-refractive-index layer having a refractive index higher than 1.6 of 30 to 58 nm thickness and the low-refractive-index layer having a refractive index lower than 1.55 of 84 to 114 nm thickness.

20. The ophthalmic lens of claim 17 , wherein the interference coating comprises, in order starting from the substrate:
a high-refractive-index layer having a refractive index higher than 1.6 of 19 to 39 nm thickness;
a low-refractive-index layer having a refractive index lower than 1.55 of 26 to 46 nm thickness;
a high-refractive-index layer having a refractive index higher than 1.6 of 43 to 63 nm thickness;
a low-refractive-index layer having a refractive index lower than 1.55 of 52 to 72 nm thickness;
a high-refractive-index layer having a refractive index higher than 1.6 of 24 to 44 nm thickness;
a low-refractive-index layer having a refractive index lower than 1.55 of 44 to 64 nm thickness;
a high-refractive-index layer having a refractive index higher than 1.6 of 28 to 48 nm thickness;
a low-refractive-index layer having a refractive index lower than 1.55 of 95 to 116 nm thickness.

21. The ophthalmic lens of claim 20 , wherein the interference coating further comprises an electrically conductive layer of 3 to 10 nm thickness between the high-refractive-index layer having a refractive index higher than 1.6 of 28 to 48 nm thickness and the low-refractive-index layer having a refractive index lower than 1.55 of 95 to 116 nm thickness.

22. The ophthalmic lens of clai

Assignees

• Essilor Int
• Essilor Int

Inventors

• Passard Delphine
• Maitre Nicolas

Classifications

• G02C7/104

  having spectral characteristics for purposes other than sun-protection · CPC title

• G02B1/116

  including electrically conducting layers · CPC title

• G02B5/26

  Reflecting filters (G02B5/28 takes precedence) · CPC title

• G02B5/283

  designed for the ultraviolet · CPC title

• G02C7/107 Primary

  Interference colour filters · CPC title