High efficiency polarizing lens with color enhancement

Patent metadata

Field	Value
Publication number	US-12276871-B2
Application number	US-202117475802-A
Country	US
Kind code	B2
Filing date	Sep 15, 2021
Priority date	Sep 25, 2020
Publication date	Apr 15, 2025
Grant date	Apr 15, 2025

Abstract

A light filtering element, includes: at least one layer, a first layer of the at least one layer being stretched along a strain direction and including a first narrowband dye, the first narrowband dye including a first narrowband dye peak absorbance wavelength with a first narrowband dye bandwidth; and a first dichroic dye configured to absorb polarized light, the first dichroic dye including a first dichroic dye peak absorbance wavelength with a first dichroic dye bandwidth, molecules of the first dichroic dye being at least partially oriented along the strain direction.

First claim

What is claimed is:

1. A light filtering element, comprising:
at least one layer, a first layer of the at least one layer being stretched along a strain direction and including
a first narrowband dye, the first narrowband dye including a first narrowband dye peak absorbance wavelength with a first narrowband dye bandwidth; and
a first dichroic configured to absorb polarized light, the first dichroic dye including a first dichroic dye peak absorbance wavelength with a first dichroic dye bandwidth, molecules of the first dichroic dye being at least partially oriented along the strain direction;

at least 25% of the first dichroic dye being oriented along the strain direction; and
a polarization efficiency of the light filtering element being greater than 97%.

2. The light filtering element according to claim 1 , wherein
a second layer of the at least one layer is integrated with the first layer of the at least one layer, the second layer of the at least one layer being a polarizing film configured to absorb polarized light.

3. The light filtering element according to claim 1 , wherein
the first narrowband dye peak absorbance wavelength is approximately 498 nm; and
the first narrowband dye bandwidth is less than 40 nm.

4. The light filtering element according to claim 1 , further comprising:
a lens integrated with the at least one layer, wherein
a third layer of the at least one layer is integrated with the second layer of the at least one layer, the third layer of the at least one layer being a transparent film.

5. A light filtering element, comprising:
a lens; and
at least one layer including a first layer, a second layer, and a third layer, wherein
the first layer of the at least one layer is stretched along a strain direction and includes
a first narrowband dye, the first narrowband dye including a first narrowband dye peak absorbance wavelength with a first narrowband dye bandwidth; and
a first dichroic dye configured to absorb polarized light, the first dichroic dye including a first dichroic dye peak absorbance wavelength with a first dichroic dye bandwidth, molecules of the first dichroic dye being at least partially oriented along the strain direction, at least 25% of the first dichroic dye being oriented along the strain direction;

the second layer of the at least one layer is integrated with the first layer of the at least one layer, the second layer of the at least one layer being a polarizing film configured to absorb polarized light,
the third layer of the at least one layer is integrated with the second layer of the at least one layer, the third layer of the at least one layer being a transparent film,
the lens is integrated with the at least one layer; and
a polarization efficiency of the light filtering element is greater than 97%.

6. The light filtering element according to claim 5 , wherein
the first narrowband dye peak absorbance wavelength is approximately 498 nm; and
the first narrowband dye bandwidth is less than 40 nm.

7. The light filtering element according to claim 5 , wherein the first narrowband dye is dichroic and configured to absorb polarized light.

8. The light filtering element according to claim 5 , wherein
the first layer of the at least one layer further includes a second narrowband dye, the second narrowband dye including a second narrowband dye peak absorbance wavelength equal to approximately 585 nm and a second narrowband dye bandwidth is less than 40 nm.

9. A method of forming a light filtering element, comprising:
extruding a first layer, the first layer including
a first narrowband dye, the first narrowband dye including a first narrowband dye peak absorbance wavelength with a first narrowband dye bandwidth, and
a first dichroic dye configured to absorb polarized light, the first dichroic dye including a first dichroic dye peak absorbance wavelength with a first dichroic dye bandwidth; and

stretching the first layer along a strain direction, molecules of the first dichroic dye being at least partially oriented along the strain direction,
wherein at least 25% of the first dichroic dye is oriented along the strain direction, and a polarization efficiency of the light filtering element is greater than 97%.

10. The method according to claim 9 , further comprising:
laminating the stretched first layer to a second layer, the second layer configured to absorb light polarized perpendicular to a polarization axis of the second layer;
laminating a third layer to the second layer, the third layer being optically transparent;
forming the first stretched layer, the second layer, and the third layer to a wafer having a predetermined curvature; and
optically coupling the thermoformed wafer to a lens.

11. The method according to claim 9 , wherein
the first narrowband dye peak absorbance wavelength is approximately 498 nm; and
the first narrowband dye bandwidth is less than 40 nm.

12. The method according to claim 9 , wherein
the first layer includes a second narrowband dye, the second narrowband dye including a second narrowband dye peak absorbance wavelength equal to approximately 585 nm and a second narrowband dye bandwidth is less than 40 nm.

Assignees

• Essilor Int

Inventors

• Balasubramanian Srinivasan
• French Elliot
• Jallouli Aref

Classifications

• G02C2202/16

  Laminated or compound lenses · CPC title

• G02C7/12

  Polarisers · CPC title

• G02B5/223 Primary

  containing organic substances, e.g. dyes, inks or pigments · CPC title

• G02B5/3033

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• G02C7/108 Primary

  Colouring materials · CPC title