Optical article comprising an antireflective coating with a very low reflection in the visible region

Patent metadata

Field	Value
Publication number	US-9772509-B2
Application number	US-201314902991-A
Country	US
Kind code	B2
Filing date	Jul 5, 2013
Priority date	Jul 5, 2013
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

This invention relates to an ophthalmic lens comprising a transparent substrate with a front main face and with a rear main face, at least one of the main faces being coated with a multilayered antireflective coating comprising a stack of at least one layer having a refractive index higher than or equal 1.5 and at least one layer having a refractive index lower than 1.5, such that:—the mean light reflection factor in the visible region R v is lower than or equal to 0.5% for an angle of incidence lower than 35°;—the Chroma C* is equal or higher than 18, preferably 20, according to the international colorimetric CIE L*a*b* for an angle of incidence (Θ) of 15°.

First claim

The invention claimed is:

1. An ophthalmic lens comprising a transparent substrate with a front main face and with a rear main face, at least one of the main faces being coated with a multilayered antireflective coating comprising a stack of at least one layer having a refractive index higher than or equal 1.5 and at least one layer having a refractive index lower than 1.5, such that:
the mean light reflection factor in the visible region R v is lower than or equal to 0.5%, for at least an angle of incidence lower than 35°;
the Chroma C* is equal or higher than 18 for an angle of incidence (θ) of 15°.

2. The ophthalmic lens according to claim 1 , wherein the multilayered antireflective coating has a hue (h) from 275° to 325° at an angle of incidence (θ) of less than or equal to 30°.

3. The ophthalmic lens according to claim 1 or 2 , wherein the multilayered antireflective coating has a Chroma C*, which is lower than or equal to 11 for an angle of incidence (θ) higher than 35°.

4. The ophthalmic lens according to claim 1 or 2 , wherein the multilayered antireflective coating has a mean reflection factor R UV between 280 nm and 380 nm, weighted by the function W(λ) defined in the ISO 13666:1998 standard, lower than 13% for an angle of incidence in the range from 20° to 50°.

5. The ophthalmic lens according to claim 4 , wherein the multilayered antireflective coating has a mean reflection factor R UV between 280 nm and 380 nm, weighted by the function W(λ) defined in the ISO 13666:1998 standard, lower than 13% for an angle of incidence in the range from 30° to 45°.

6. The ophthalmic lens according to claim 1 or 2 , wherein the multilayered antireflective coating has a mean reflection factor in the visible region R m lower than or equal to 1.15% for an angle of incidence lower than or equal to 35°.

7. The ophthalmic lens according to claim 6 , wherein the multilayered antireflective coating has a mean reflection factor in the visible region R m lower than or equal to 1.15% for an angle of incidence lower than or equal to 15°.

8. The ophthalmic lens according to claim 1 or 2 , wherein the multilayered antireflective coating comprises a number of layers higher than or equal to 3.

9. The ophthalmic lens according to claim 8 , wherein the multilayered antireflective coating comprises a number of layers higher than or equal to 4.

10. The ophthalmic lens according to claim 1 or 2 , wherein the multilayered antireflective coating comprises a number of layers lower than or equal to 7.

11. The ophthalmic lens according to claim 10 , wherein the multilayered antireflective coating comprises a number of layers lower than or equal to 6.

12. The ophthalmic lens according to claim 10 , wherein the multilayered antireflective coating comprises a number of layers lower than or equal to 5.

13. The ophthalmic lens according to claim 9 , wherein the antireflective coating comprises at least two layers having a refractive index equal to or higher than 1.5 and at least two layers having a refractive index lower than 1.5.

14. The ophthalmic lens according to claim 1 or 2 , wherein the antireflective coating is deposited on a silica-based sub-layer layer having a thickness of from 100 to 300 nm.

15. The ophthalmic lens according to claim 1 or 2 , wherein the antireflective coating outer layer is a silica-based layer.

16. The ophthalmic lens according to claim 13 , wherein the antireflective coating comprises, in the direction moving away from the substrate, a layer having a refractive index higher than or equal to 1.5 with a thickness of from 10 to 25 nm, a layer having a refractive index lower than 1.5 with a thickness of from 20 to 35 nm, a layer having a refractive index higher than 1.6 with a thickness of from 60 to 105 nm, optionally an electrically conductive layer with a thickness of from 3 to 10 nm, and a layer having a refractive index lower than 1.5, with a thickness of from 70 to 105 nm.

17. The ophthalmic lens according to claim 16 , wherein the antireflective coating comprises, in the direction moving away from the substrate, a layer having a refractive index higher than or equal to 1.5 with a thickness of from 14 to 22 nm, a layer having a refractive index lower than 1.5 with a thickness of from 27 to 32 nm, a layer having a refractive index higher than 1.6 with a thickness of from 68 to 90 nm, optionally an electrically conductive layer with a thickness of from 4 to 8 nm, and a layer having a refractive index lower than 1.5, with a thickness of from 87 to 95 nm.

18. The ophthalmic lens according to claim 1 or 2 , wherein the rear main face and the front main face of the ophthalmic lens are coated with said multilayered antireflective coating.

19. The ophthalmic lens according to claim 18 , wherein the front face comprises a multilayered antireflective coating having a hue (h) from 275° to 325° at an angle of incidence (θ) of less than or equal to 30°.

20. The ophthalmic lens according to claim 19 , wherein the rear face comprises a multilayered antireflective coating having a mean reflection factor R UV between 280 nm and 380 nm, weighted by the function W(λ) defined in the ISO 13666:1998 standard, lower than 13% for an angle of incidence in the range from 20° to 50°.

21. The ophthalmic lens according to claim 19 , wherein the rear face comprises a multilayered antireflective coating having a mean reflection factor R UV between 280 nm and 380 nm, weighted by the function W(λ) defined in the ISO 13666:1998 standard, lower than 13% for an angle of incidence in the range from 30° to 45°.

Assignees

• Essilor Int

Inventors

• Bolshakov Ilya
• De Ayguavives Francisco

Classifications

• G02C7/022 Primary

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

• G02B1/116

  including electrically conducting layers · CPC title

• G02C7/02

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

• G02B1/115 Primary

  Multilayers · CPC title

• G02B1/11 Primary

  Anti-reflection coatings · CPC title