Optical articles with specific color glare

Patent metadata

Field	Value
Publication number	US-12072518-B2
Application number	US-201917299832-A
Country	US
Kind code	B2
Filing date	Dec 4, 2019
Priority date	Dec 6, 2018
Publication date	Aug 27, 2024
Grant date	Aug 27, 2024

Abstract

The optical articles disclosed herein render polarized glare in a certain tunable color that is visually more perceptive than a regular tinted lens or a regular polarized lens. Optical articles, including sunglass lenses, that are configured to color plane-polarized light transmitted through the lens will draw the wearer's attention and help identify the contours or dangers on surfaces in the wearer's field of vision.

First claim

The invention claimed is:

1. An optical article configured to color plane-polarized light transmitted through the optical article, the optical article having a color (A) and comprising:
an optical article base material;
a polarizing layer having a first color tint of color (B), the first color tint being provided within the polarizing layer; and
a second color tint of color (C);
the colors (A, B, C) being described in the CIELAB color space;

wherein:
the second color of tint of color (C) is provided within the polarizing layer;
a difference in polarizing efficiency (ΔPE(λ)) of light transmitted through the optical article is at least 30% between a first visible wavelength and a second different visible wavelength;
an overall polarizing efficiency (PE) of the optical article is less than 90%;
a color difference (ΔE), calculated in the CIELAB color space, between the optical article color (A) and the first color tint color (B) is greater than 2;
a randomly-polarized white light (D65) color transmission difference (ΔEr) between the optical article and a control lens having a color tint that is comparable to a target tint for the optical article is less than 20; and
a perpendicularly-polarized white light (D65) color transmission difference (ΔEp) between the optical article and a control lens having a color tint that is comparable to a target tint for the optical article is greater than 30.

2. The optical article of claim 1 , wherein
a resulting difference in hue (Δh) between a hue of randomly-polarized white light (D65) transmitted through the optical article and a hue of perpendicularly-polarized white light (D65) transmitted through the optical article is at least 20; and
a lightness in response to perpendicularly-polarized light (L 2 ) transmitted through the optical article is greater than 20.

3. The optical article of claim 1 , wherein the difference in polarizing efficiency (ΔPE(λ)) is greater than 30% in the range of 450 to 650 nm.

4. The optical article of claim 1 , wherein the overall polarizing efficiency (PE) is between 10% and 90%.

5. The optical article of claim 1 , wherein the first color tint is a dichroic dye or a mixture of dichroic dyes.

6. The optical article of claim 1 , wherein the second color tint is a dye or a mixture of dyes.

7. The optical article of claim 1 , wherein the optical article has an a* ranging from −10 to 10 in the CIELAB color space and a b* ranging from −10 to 10 in the CIELAB color space.

8. The optical article of claim 1 , wherein the optical article has an a* ranging from 0 to 20 in the CIELAB color space and a b* ranging from 25 to 45 in the CIELAB color space.

9. The optical article of claim 1 , wherein the optical article has an a* ranging from −20 to 0 in the CIELAB color space and a b* ranging from 0 to 20 in the CIELAB color space.

10. The optical article of claim 1 , wherein the optical article is a sunglass lens, a goggle lens, a contact lens, a helmet shield, a windshield, a vehicle window, or a building window.

Assignees

• Essilor Int

Inventors

• Balasubramanian Srinivasan
• Jallouli Aref
• Marck Christelle

Classifications

• G02C7/12 Primary

  Polarisers · CPC title

• G02C7/104

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

• G02B5/20

  Filters (polarising elements G02B5/30) · CPC title

• G02C7/10

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

• G02B5/3025 Primary

  Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state (G02B5/3008, G02B5/3016 take precedence) · CPC title