Optical article comprising an antireflective coating with a low reflection both in the ultraviolet region and in the visible region
View Patent ↗This invention relates to an ophthalmic lens with a low reflection both in the ultraviolet region and in the visible region, comprising a substrate provided on its rear main face with a multilayered antireflective coating (3-7 layers) comprising a stack of at least one layer with a high refractive index and at least one layer with a low refractive index, having a mean reflection factor on the rear face in the visible region R m lower than or equal to 1.5%, a mean light reflection factor on the rear face in the visible region R v lower than or equal to 1%, a mean reflection factor R UV on the rear face between 280 nm and 380 nm, weighted by the function W(1) defined in the ISO 13666:1998 standard, lower than 5%, for angles of incidence of 30° and 45°, the antireflective coating outer layer being a silica-based layer. The lens according to the invention does especially prevent the reflection of the UV radiation produced by light sources located behind the wearer.
1. An ophthalmic lens comprising a substrate with a front main face and a rear main face, the rear main face being coated with a multilayered antireflective coating comprising a stack of at least one layer having a refractive index higher than 1.6 and of at least one layer having a refractive index lower than 1.5 wherein:
the mean reflection factor on the rear face in the visible region R m is lower than or equal to 1.15%;
the mean light reflection factor on the rear face in the visible region R v is lower than or equal to 1%;
the mean reflection factor R uv on the rear face between 280 nm and 380 nm, weighted by the function W(λ) defined in the ISO 13666:1998 standard, is lower than 5%, for an angle of incidence of 30° and for an angle of incidence of 45°;
the multilayered antireflective coating comprises at least 3 layers;
the multilayered antireflective coating does not comprise any layer with a thickness higher than or equal to 20 nm based on indium oxide;
the antireflective coating outer layer is a silica-based layer; and
the mean reflection factor R m-UV1 on the rear face between 290 nm and 330 nm is lower than 15%, for an angle of incidence of 15°.
2. The lens of claim 1 , wherein the multilayered antireflective coating comprises 7 or fewer layers.
3. The lens of claim 1 , wherein the multilayered antireflective coating does not comprise any layer with a thickness higher than 15 nm based on indium oxide.
4. An ophthalmic lens comprising a substrate with a front main face and a rear main face, the rear main face being coated with a multilayered antireflective coating comprising a stack of at least one layer having a refractive index higher than 1.6 and of at least one layer having a refractive index lower than 1.5 wherein:
the mean reflection factor on the rear face in the visible region R m is lower than or equal to 1.15%;
the mean light reflection factor on the rear face in the visible region R v is lower than or equal to 1%;
the mean reflection factor R uv on the rear face between 280 nm and 380 nm, weighted by the function W(λ) defined in the ISO 13666:1998 standard, is lower than 5%, for an angle of incidence of 30°and for an angle of incidence of 45°;
the multilayered antireflective coating comprises at least 3 layers;
the multilayered antireflective coating does not comprise any layer with a thickness higher than or equal to 20 nm based on indium oxide;
the antireflective coating outer layer is a silica-based layer; and
the mean reflection factor R m-UV3 on the rear face between 300 nm and 380 nm is lower than 5%, for an angle of incidence of 15°.
5. The lens of claim 4 , wherein the multilayered antireflective coating comprises 7 or fewer layers.
6. The lens of claim 4 , wherein the multilayered antireflective coating does not comprise any layer with a thickness higher than 15 nm based on indium oxide.
7. An ophthalmic lens comprising a substrate with a front main face and a rear main face, the rear main face being coated with a multilayered antireflective coating comprising a stack of at least one layer having a refractive index higher than 1.6 and of at least one layer having a refractive index lower than 1.5 wherein:
the mean reflection factor on the rear face in the visible region R m is lower than or equal to 1.15%;
the mean light reflection factor on the rear face in the visible region R v is lower than or equal to 1%;
the mean reflection factor R uv on the rear face between 280 nm and 380 nm, weighted by the function W(λ) defined in the ISO 13666:1998 standard, is lower than 5%, for an angle of incidence of 30° and for an angle of incidence of 45°;
the multilayered antireflective coating comprises at least 3 layers;
the multilayered antireflective coating does not comprise any layer with a thickness higher than or equal to 20 nm based on indium oxide;
the antireflective coating outer layer is a silica-based layer; and
the mean spectral reflection factor on the rear face is higher than 5% over at least 20% of the 280-295 nm wavelength range, for both an angle of incidence of 30° and for an angle of incidence of 45°.
8. The lens of claim 7 , wherein the mean spectral reflection factor on the rear face is higher than 6% over at least 20% of the 280-295 nm wavelength range, for both an angle of incidence of 30° and for an angle of incidence of 45°.
9. The lens of claim 7 , wherein the multilayered antireflective coating comprises 7 or fewer layers.
10. The lens of claim 7 , wherein the multilayered antireflective coating does not comprise any layer with a thickness higher than 15 nm based on indium oxide.
11. An ophthalmic lens comprising a substrate with a front main face and a rear main face, the rear main face being coated with a multilayered antireflective coating comprising a stack of at least one layer having a refractive index higher than 1.6 and of at least one layer having a refractive index lower than 1.5 wherein:
the mean reflection factor on the rear face in the visible region R m is lower than or equal to 1.15%;
the mean light reflection factor on the rear face in the visible region R v is lower than or equal to 1%;
the mean reflection factor R uv on the rear face between 280 nm and 380 nm, weighted by the function W(λ) defined in the ISO 13666:1998 standard, is lower than 5%, for an angle of incidence of 30° and for an angle of incidence of 45°;
the multilayered antireflective coating comprises at least 3 layers;
the multilayered antireflective coating does not comprise any layer with a thickness higher than or equal to 20 nm based on indium oxide;
the antireflective coating outer layer is a silica-based layer; and
the mean reflection factor on the rear face in the visible region R m is lower than or equal to 1%.
12. The lens of claim 11 , wherein the multilayered antireflective coating comprises 7 or fewer layers.
13. The lens of claim 11 , wherein the multilayered antireflective coating does not comprise any layer with a thickness higher than 15 nm based on indium oxide.
14. An ophthalmic lens comprising a substrate with a front main face and a rear main face, the rear main face being coated with a multilayered antireflective coating comprising a stack of at least one layer having a refractive index higher than 1.6 and of at least one layer having a refractive index lower than 1.5 wherein:
the mean reflection factor on the rear face in the visible region R m is lower than or equal to 1.15%;
the mean light reflection factor on the rear face in the visible region R v is lower than or equal to 1%;
the mean reflection factor R UV on the rear face between 280 nm and 380 nm, weighted by the function W(λ) defined in the ISO 13666:1998 standard, is lower than 5%, for an angle of incidence of 30° and for an angle of incidence of 45°;
the multilayered antireflective coating comprises at least 3 layers:
the multilayered antireflective coating does not comprise any layer with a thickness higher than or equal to 20 nm based on indium oxide;
the antireflective coating outer layer is a silica-based layer; and
the mean light reflection factor on the rear face in the visible region R v is lower than or equal to 0.90%.
15. The lens of claim 14 , wherein the multilayered antireflective coating comprises 7 or fewer layers.
16. The lens of claim 14 , wherein the multilayered antireflective coating does not comprise any layer with a thickness higher than 15 nm based on indium oxide.
17. An ophthalmic lens comprising a substrate with a front main face and a rear main face, the rear main face being coated with a multilayered antireflective coating comprising a stack of at least one layer having a refractive index higher than 1.6 and of at least one layer having a refractive index lower than 1.5 wherein:
the mean reflection factor on the rear face in the visible region R m is lower than or equal to 1.15%;
the mean light reflection factor on the rear face in the visible region R v is lower than or equal to 1%;
the mean reflection factor R uv on the rear face between 280 nm and 380 nm, weighted by the function W(λ) defined in the ISO 13666:1998 standard, is lower than 5%, for an angle of incidence of 30° and for an angle of incidence of 45°;
the multilayered antireflective coating comprises at least 3 layers;
the multilayered antireflective coating does not comprise any layer with a thickness higher than or equal to 20 nm based on indium oxide;
the antireflective coating outer layer is a silica-based layer; and
the mean reflection factor R UV on the rear face between 280 nm and 380 nm, weighted by the function W(λ) defined in the ISO 3666:1998 standard, is lower than 4.5%, for an angle of incidence of 30° and for an angle of incidence of 45°.
18. The lens of claim 17 , wherein the multilayered antireflective coating comprises 7 or fewer layers.
19. The lens of claim 17 , wherein the multilayered antireflective coating does not comprise any layer with a thickness higher than 15 nm based on indium oxide.
20. An ophthalmic lens comprising a substrate with a front main face and a rear main face, the rear main face being coated with a multilayered antireflective coating comprising a stack of at least one layer having a refractive index higher than 1.6 and of at least one layer having a refractive index lower than 1.5 wherein:
the mean reflection factor on the rear face in the visible region R m is lower than or equal to 1.15%;
the mean light reflection factor on the rear face in the visible region R v is lower than or equal to 1%;
the mean reflection factor R UV on the rear face between 280 nm and 380 nm, weighted by the function W(λ) defined in the ISO 13666:1998 standard, is lower than 5%, for an angle of incidence of 30° and for an angle of incidence of 45°;
the multilayered antireflective coating comprises at least 3 layers;
the multilayered antireflective coating does not comprise any layer with a thickness higher than or equal to 20 nm based on indium oxide;
the antireflective coating outer layer is a silica-based layer; and
the antireflective coating comprises, in the direction moving away from the substrate, a layer having a refractive index higher than 1.6 with a thickness of from 8 to 25 nm, a layer having a refractive index lower than 1.5 with a thickness of from 10 to 35 nm, a layer having a refractive index higher than 1.6 with a thickness of from 75 to 105 nm, and a layer having a refractive index lower than 1.5 with a thickness of from 60 to 95 nm.
21. The lens of claim 20 , wherein the multilayered antireflective coating comprises 7 or fewer layers.
22. The lens of claim 20 , wherein the multilayered antireflective coating does not comprise any layer with a thickness higher than 15 nm based on indium oxide.
23. An ophthalmic lens comprising a substrate with a front main face and a rear main face, the rear main face being coated with a multilayered antireflective coating comprising a stack of at least one layer having a refractive index higher than 1.6 and of at least one layer having a refractive index lower than 1.5 wherein:
the mean reflection factor on the rear face in the visible region R m is lower than or equal to 1.15%;
the mean light reflection factor on the rear face in the visible region R v is lower than or equal to 1%;
the mean reflection factor R UV on the rear face between 280 nm and 380 nm, weighted by the function W(λ) defined in the ISO 13666:1998 standard, is lower than 5%, for an angle of incidence of 30° and for an angle of incidence of 45°;
the multilayered antireflective coating comprises at least 3 layers;
the multilayered antireflective coating does not comprise any layer with a thickness higher than or equal to 20 nm based on indium oxide;
the antireflective coating outer layer is a silica-based layer; and
the multilayered antireflective coating does not comprise any MgF 2 layer.
24. The lens of claim 23 , wherein the multilayered antireflective coating comprises 7 or fewer layers.
25. The lens of claim 23 , wherein the multilayered antireflective coating does not comprise any layer with a thickness higher than 15 nm based on indium oxide.
26. An ophthalmic lens comprising a substrate with a front main face and a rear main face, the rear main face being coated with a multilayered antireflective coating comprising a stack of at least one layer having a refractive index higher than 1.6 and of at least one layer having a refractive index lower than 1.5 wherein:
the mean reflection factor on the rear face in the visible region R m is lower than or equal to 1.15%;
the mean light reflection factor on the rear face in the visible region R v is lower than or equal to 1%;
the mean reflection factor R UV on the rear face between 280 nm and 380 nm, weighted by the function W(λ) defined in the ISO 13666:1998 standard, is lower than 5%, for an angle of incidence of 30° and for an angle of incidence of 45°;
the multilayered antireflective coating comprises at least 3 layers;
the multilayered antireflective coating does not comprise any layer with a thickness higher than or equal to 20 nm based on indium oxide;
the antireflective coating outer layer is a silica-based layer; and
wherein the lens is further defined as a tinted solar lens.
27. The lens of claim 26 , wherein the multilayered antireflective coating comprises 7 or fewer layers.
28. The lens of claim 26 , wherein the multilayered antireflective coating does not comprise any layer with a thickness higher than 15 nm based on indium oxide.