Optical article comprising an antireflective coating with a low reflection both in the ultraviolet region and in the visible region

Patent metadata

Field	Value
Publication number	US-9488852-B2
Application number	US-201414470605-A
Country	US
Kind code	B2
Filing date	Aug 27, 2014
Priority date	Dec 10, 2010
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

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 1.15%, 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(λ) 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.

First claim

The invention claimed is:

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 R m-UV2 on the rear face between 300 nm and 320 nm is lower than 4%, for an angle of incidence of 15° and/or 30° and/or 45°;
the multilayered antireflective coating comprises at least 3 layers;
the multilayered antireflective coating does not comprise any layer with a thickness higher than 15 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 for at least one wavelength in the 280-295 nm range for both an angle of incidence of 30° and an angle of incidence of 45° is higher than 5%.

2. The lens of claim 1 , wherein the multilayered antireflective coating comprises at least 4 layers.

3. The lens of claim 1 , wherein the multilayered antireflective coating comprises 7 or fewer layers.

4. The lens of claim 3 , wherein the multilayered antireflective coating comprises 5 or fewer layers.

5. The lens of claim 1 , wherein the antireflective coating comprises at least two layers having a refractive index higher than 1.6 and at least two layers having a refractive index lower than 1.5.

6. The lens of claim 1 , further defined as having a mean reflection factor R m-UV1 on the rear face between 290 nm and 330 nm that is lower than 15%, for an angle of incidence of 15°.

7. The lens of claim 1 , wherein the mean reflection factor R m-UV2 on the rear face between 300 nm and 320 nm is lower than 3% for an angle of incidence of 15° and/or 30° and/or 45°.

8. The lens of claim 1 , further defined as having a mean reflection factor R m-UV3 on the rear face between 300 nm and 380 nm that is lower than 5%, for an angle of incidence of 15°.

9. The lens of claim 1 , further defined as having a mean spectral reflection factor on the rear face that is higher than 5% over at least 20% of the 280-295 nm wavelength range, for both an angle of incidence of 30° and an angle of incidence of 45°.

10. The lens of claim 1 , wherein the further defined as having a mean reflection factor on the rear face in the visible region R m lower than or equal to 1.15%.

11. The lens of claim 1 , further defined as having a mean light reflection factor on the rear face in the visible region R v lower than or equal to 0.90%.

12. The lens of claim 1 , further defined as having a 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, lower than or equal to 4.5%, for an angle of incidence of 30° and for an angle of incidence of 45°.

13. The lens of claim 1 , wherein the multilayered antireflective coating does not comprise any MgF 2 layer.

14. The lens of claim 1 , wherein the mean spectral reflection factor on the rear face for at least one wavelength in the 280-295 nm range for both an angle of incidence of 30° and an angle of incidence of 45° is higher than 6%.

15. The lens of claim 1 , wherein the antireflective coating is deposited on a sub-layer comprising a SiO 2 -based layer.

16. The lens of claim 15 , wherein the sub-layer is deposited on an anti-abrasion coating.

17. The lens of claim 16 , wherein the anti-abrasion coating is prepared from a composition comprising at least one alkoxysilane and/or a hydrolyzate thereof.

18. The lens of claim 1 , wherein the mean spectral reflection factor on the rear face over at least 70% of the 280-290 nm wavelength range, for an angle of incidence of 15° is higher than 10%.

19. The lens of claim 1 , further defined as having a 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, lower than 5%, for both an angle of incidence of 30° and for an angle of incidence of 45°.

20. The lens of claim 1 , wherein the mean spectral reflection factor on the rear face over at least 70% of the 280-295 nm wavelength range for an angle of incidence 15° is higher than 10%.

21. The lens of claim 1 , wherein the mean spectral reflection factor on the rear face over at least 70% of the 280-290 nm wavelength range for an angle of incidence 15° is higher than 15%.

22. The lens of claim 1 , wherein the mean spectral reflection factor on the rear face for at least one wavelength in the 280-295 nm range for both an angle of incidence of 30° and an angle of incidence of 45° is higher than 10%.

23. The lens of claim 1 , further defined as having a mean reflection factor on the rear face in the visible region R m lower than or equal to 1.15% and the mean light reflection factor on the rear face in the visible region R v lower than or equal to 1%.

24. The lens of claim 1 , further defined as having a mean light reflection factor on the rear face in the visible region R v lower than or equal to 1%.

Assignees

• Essilor Int

Inventors

• Cado Herve
• De Ayguavives Francisco
• Pophillat Olivier

Classifications

• G02B5/283

  designed for the ultraviolet · CPC title

• G02C7/02

  Lenses; Lens systems {; Methods of designing lenses} · CPC title

• G02C7/022 Primary

  Ophthalmic lenses having special refractive features achieved by special materials or material structures (G02C7/049 takes precedence) · CPC title

• G02C2202/16

  Laminated or compound lenses · CPC title

• G02C7/10

  Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses · CPC title