Optical films and methods of manufacturing such optical films

Patent metadata

Field	Value
Publication number	US-12204119-B2
Application number	US-202017597810-A
Country	US
Kind code	B2
Filing date	Aug 3, 2020
Priority date	Aug 6, 2019
Publication date	Jan 21, 2025
Grant date	Jan 21, 2025

Abstract

An optical film includes a film body defining an upper surface, a lower surface opposite to the upper surface, and at least one outer edge extending between the upper and lower surfaces. The optical film also includes at least one energy radiated discolored portion formed in the film body. The at least one energy radiated discolored portion includes a radiation absorbing material.

First claim

The invention claimed is:

1. An optical film comprising:
a film body defining an upper surface, a lower surface opposite to the upper surface, and at least one outer edge extending between the upper and lower surfaces; and
at least one energy radiated discolored portion formed in the film body, wherein the at least one energy radiated discolored portion includes a radiation absorbing material, wherein the film body further comprises at least one through aperture defined by an inner surface, wherein the at least one energy radiated discolored portion is formed in the inner surface defining the at least one through aperture.

2. The optical film of claim 1 , wherein the at least one energy radiated discolored portion is black in color.

3. The optical film of claim 1 , wherein the at least one energy radiated discolored portion is configured to transmit less than 80% of incident light.

4. The optical film of claim 1 , wherein the at least one energy radiated discolored portion is formed in at least a section of the at least one outer edge of the film body.

5. The optical film of claim 1 , wherein the film body comprises a plurality of outer edges, and wherein the at least one energy radiated discolored portion is formed in each of the plurality of outer edges.

6. The optical film of claim 1 , wherein the at least one energy radiated discolored portion is formed in the upper portion of the film body.

7. The optical film of claim 1 , wherein the at least one energy radiated discolored portion comprises a plurality of linear energy radiated discolored portions formed in the upper surface of the film body.

8. The optical film of claim 1 , wherein the radiation absorbing material is an exothermic metal oxide.

9. The optical film of claim 1 , wherein the film body is made of one or more resins mixed with the radiation absorbing material.

10. The optical film of claim 1 , wherein the film body includes a coating of the radiation absorbing material.

11. The optical film of claim 1 , wherein a section of the film body is irradiated by a laser beam for forming the at least one energy radiated discolored portion in the film body.

12. The optical film of claim 11 , wherein the laser beam includes at least one of a carbon dioxide laser and an yttrium aluminum garnet laser.

13. The optical film of claim 1 , wherein the film body comprises a substrate and a plurality of micro-structures disposed on the substrate.

14. A method of manufacturing an optical film, the method comprising:
forming a film body defining an upper surface, a lower surface opposite to the upper surface, and at least one outer edge extending between the upper and lower surfaces, wherein at least one section of the film body includes a radiation absorbing material, and wherein the film body comprises a plurality of outer edges, and wherein the at least one discolored portion is formed in each of the plurality of outer edges; and
forming at least one discolored portion in the film body, wherein the at least one discolored portion is formed by irradiating a laser beam along the at least one section of the film body that includes the radiation absorbing material.

15. The method of claim 14 , wherein the at least one discolored portion is formed in the at least one section of the at least one outer edge of the film body.

16. The method of claim 14 , wherein the film body comprises a plurality of outer edges, and wherein the at least one discolored portion is formed in each of the plurality of outer edges.

17. The method of claim 14 , wherein the at least one discolored portion is formed in the upper portion of the film body.

18. The method of claim 14 , wherein the radiation absorbing material is an exothermic metal oxide.

19. A method of manufacturing an optical film, the method comprising:
forming a mixture of one or more resins and a radiation absorbing material;
forming a film body from the mixture; and
irradiating at least one section of the film body by a laser beam to form at least one discolored portion and wherein the film body comprises a plurality of outer edges, and wherein the at least one discolored portion is formed in each of the plurality of outer edges.

Assignees

• 3M Innovative Properties Company

Inventors

• Saito Yuji
• Hattori Jiro

Classifications

• G02F1/0063

  Optical properties, e.g. absorption, reflection or birefringence (materials for non-linear optics G02F1/355) · CPC title

• G02B5/22

  Absorbing filters {(G02B5/201 - G02B5/208 take precedence)} · CPC title

• B29D11/00634

  Production of filters · CPC title

• G02B5/208

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title

• G02B5/206

  comprising particles embedded in a solid matrix · CPC title