Spectacle lens comprising an activable optical filter

Patent metadata

Field	Value
Publication number	US-11287674-B2
Application number	US-201816487707-A
Country	US
Kind code	B2
Filing date	Feb 20, 2018
Priority date	Feb 22, 2017
Publication date	Mar 29, 2022
Grant date	Mar 29, 2022

Abstract

A spectacle lens including an activable optical filter, the activable optical filter being configured to be actively switched between at least three configurations, wherein in the first configuration, the color perception of the spectacle wearer is unaltered, in the second configuration the activable optical filter provides a specific filtering function, in the third configuration vision of the spectacle wearer is protected against glare.

First claim

The invention claimed is:

1. A spectacle lens comprising an activable optical filter, the activable optical filter comprising several activable elements and being configured to be actively switched between at least three configurations, wherein
in the first configuration, all activable elements are non-activated, and the color perception of the spectacle wearer is unaltered and light transmitted through the activable optical filter has a chroma C*1 and hue h°1,
in the second configuration, at least a first activable element being activated and light transmitted through the activable optical filter has a chroma C*2 and hue h°2,
in the third configuration, at least a second activable element being activated and vision of the spectacle wearer is protected against glare and light transmitted through the activable optical filter has a chroma C*3 and hue h°3, and
the chromaticity difference ΔChrom between (C*2, h°2) and (C*3, h°3) is larger than or equal to 20,
wherein each activable element comprises an electrochromic dye compound, or an electrochromic cell comprising an electrochromic dye compound, or is configured to filter light radiations over at least one predetermined range of wavelengths, wherein the full width at half maximum of the filtering function of the activable optical filter is smaller than or equal to 100 nm.

2. The spectacle lens according to claim 1 , wherein in the first configuration the activable optical filter has a transmittance T1 greater than or equal to 80% and/or light transmitted through the activable optical filter has chroma C*1 smaller than or equal to 15.

3. The spectacle lens according to claim 1 , wherein the first configuration corresponds to a non activated configuration of the activable optical filter.

4. The spectacle lens according to claim 1 , wherein in the third configuration the activable optical filter has a transmittance T3 smaller than or equal to 8%.

5. The spectacle lens according to claim 1 , wherein in the third configuration light transmitted through the activable optical filter has a neutral color or has a chromaticity difference ΔChrom between (C*1, h°1) and (C*3, h°3) smaller than or equal to 20.

6. The spectacle lens according to claim 1 , wherein in the second configuration light transmitted through the activable optical filter has a chroma C*2 larger than or equal to 75.

7. The spectacle lens according to claim 1 , wherein in the second configuration light transmittance T2 through the activable optical filter is reduced by at least 10% as compared to the transmittance T1 of first configuration, on a range of wavelength selected in the following list of wavelength ranges: from 400 nm to 460 nm, from 420 nm to 450 nm, from 465 nm to 495 nm, from 480 nm to 520 nm, from 460 nm to 520 nm, from 560 nm to 600 nm, from 580 nm to 620 nm and from 530 nm to 650 nm.

8. The spectacle lens according to claim 1 , wherein the activable optical filter comprises at least one cell comprising two electrochromic dye compounds having different oxidation potentials between two transparent supports and at least two transparent electrodes, the electrochromic dye compounds undergoing at least one optical property change upon application of an electrical field between the transparent supports using at least two transparent electrodes.

9. The spectacle lens according to claim 8 , wherein at least one of the electrochromic dye compounds is in the list consisting of compounds comprising one or several pyridinium rings.

10. The spectacle lens according to claim 1 , wherein the activable optical filter comprises two independent electrochromic cells each comprising a different electrochromic dye compound.

11. The spectacle lens according to claim 1 , wherein the activable optical filter comprises an electrochromic cell comprising an electrochromic dye compound and a second element configured to filter light radiations over at least one predetermined range of wavelengths, wherein the full width at half maximum of the filtering function of the activable optical filter is smaller than or equal to 100 nm.

12. The spectacle lens according to claim 1 , having an ophthalmic function adapted to a wearer.

13. An optical equipment comprising the spectacle lens according to claim 1 , and a control unit configured to control the activable optical filter so as to have the activable optical filter switch between the at least three configurations.

14. The optical equipment according to claim 13 , further comprising at least one sensor configured to sense a luminosity parameter and wherein the control unit is configured to control the activable optical filter based on the luminosity parameter provided by the sensor.

15. The spectacle lens according to claim 1 , wherein each electrochromic dye compound is positioned in one cell, the electrochromic dye compounds have different oxidation potentials between two transparent supports and at least two transparent electrodes, the electrochromic dye compounds undergo at least one optical property change upon application of an electrical field between the transparent supports using the at least two transparent electrodes.

16. The spectacle lens according to claim 1 , each electrochromic cell comprising a different electrochromic dye compound.

17. The spectacle lens according to claim 1 , comprising a first activable element comprising an electrochromic cell comprising an electrochromic dye compound and a second activable element configured to filter light radiations over at least one predetermined range of wavelengths, wherein the full width at half maximum of the filtering function of the activable optical filter is smaller than or equal to 100 nm.

Assignees

• Essilor Int

Inventors

• Ballet Jerome
• Archambeau Samuel
• Cano Jean-Paul
• Arrouy Frederic
• Quere Loic

Classifications

• G02F1/1503

  caused by oxidation-reduction reactions in organic liquid solutions, e.g. viologen solutions · CPC title

• G02C7/104

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

• G02C7/101 Primary

  having an electro-optical light valve (electro-optical elements per se G02F) · CPC title

• G02C7/105

  having inhomogeneously distributed colouring · CPC title

• G02F1/153

  Constructional details · CPC title