Fiber reinforced optical films

• US 20060257678A1
• Filed: 05/10/2005
• Published: 11/16/2006
• Est. Priority Date: 05/10/2005
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Detwiler, Noreen G., Thunhorst, Kristin L., Fleming, Patrick R., Benson, Olester Jr.
• Application Number:
  US11/125,580
• Publication Number:
  US 20060257678A1
• Time in Patent Office: Days
• US Class Current: 428/542.800
• CPC Class Codes: C08K 7/04 inorganic
• CPC Class Codes: G02B 1/04 made of organic materials, e.g. plastics G02B1/08 takes precedence
• CPC Class Codes: G02B 5/02 Diffusing elements; Afocal elements
• CPC Class Codes: G02B 5/3008 comprising dielectric particles, e.g. birefringent crystals embedded in a matrix

Abstract

Optical bodies, for example optical films, are formed with inorganic fibers embedded within a polymer matrix. In some embodiments, the refractive indices of the inorganic fibers and the polymer matrix are matched. There need be no bonding agent between the fibers and the polymer matrix. The inorganic fibers may be glass fibers, ceramic fibers, or glass-ceramic fibers. A structure may be provided on the surface of the optical body, for example to provide optical power to light passing through the optical body. The body may be formed using a continuous process, with a continuous layer of the inorganic fibers being embedded within the matrix which is then solidified.

Claims

1. An optical body, comprising:

a polymer matrix, the polymer matrix having a first refractive index; and

a plurality of inorganic fibers embedded within the polymer matrix without a coupling agent, the inorganic fibers being formed of an inorganic material having a second refractive index substantially matched to the first refractive index.

2. An optical body as recited in claim 1, wherein the polymer matrix is birefringent, the polymer matrix having a third refractive index different from the first refractive index.

3. An optical body as recited in claim 1, wherein the polymer matrix is substantially isotropic.

4. An optical body as recited in claim 1, wherein the inorganic fibers are arranged in tows embedded within the polymer matrix.

5. An optical body as recited in claim 1, wherein the inorganic fibers are arranged as at least one of a non-woven, chopped fibers or a chopped fiber mat embedded within the polymer matrix.

6. An optical body as recited in claim 1, wherein the inorganic fibers are arranged as at least one fiber weave embedded within the polymer matrix.

7. An optical body as recited in claim 6, wherein the inorganic fibers are included within at least one of the warp and the weft of the fiber weave, and at least one of the warp and the weft of the fiber weave comprises at least one of polymer fibers and natural fibers.

8. An optical body as recited in claim 7, wherein the polymer fibers comprise birefringent polymer material.

9. An optical body as recited in claim 1, wherein the inorganic fibers comprise at least glass fibers.

10. An optical body as recited in claim 1, wherein the inorganic fibers comprise at least ceramic fibers.

11. An optical body as recited in claim 1, wherein the inorganic fibers comprise at least glass-ceramic fibers.

12. An optical body as recited in claim 1, wherein at least one of the inorganic fibers is formed in a yarn with one or more polymeric fibers.

13. An optical body as recited in claim 12, wherein the yarn is formed with a centrally positioned inorganic fiber and two or more polymeric fibers twisted around the centrally positioned inorganic fiber.

14. An optical body as recited in claim 1, wherein the body comprises at least one structured surface.

15. An optical body as recited in claim 14, wherein the structured surface provides optical power to light passing through the optical body.

16. An optical body as recited in claim 15, wherein the structured surface comprises at least one lens.

17. An optical body as recited in claim 14, wherein the at least one structured surface comprises an array of prismatic structures.

18. An optical body as recited in claim 1, further comprising an additive within the polymer matrix, the additive effectively adjusting the refractive index of the polymer matrix.

19. An optical body as recited in claim 1, further comprising an additive within the polymer matrix, the additive effectively increasing the strength of the polymer matrix.

20. An optical body as recited in claim 1, wherein the polymer matrix comprises a UV-cured acrylate.

21. An optical body as recited in claim 1, wherein the polymer matrix comprises a cross-linkable material.

22. An optical body as recited in claim 1, further comprising light diffusing particles embedded within the polymer matrix.

23. An optical body, comprising:

a transparent polymer matrix, the polymer matrix having a first refractive index; and

a plurality of transparent fibers embedded within the polymer matrix, the fibers being formed of an inorganic fiber material;

wherein the body has at least one structured surface.

24. An optical body as recited in claim 23, the fiber material having a second refractive index that is substantially the same as the first refractive index

25. An optical body as recited in claim 23, wherein the at least one structured surface provides optical power to light passing through the optical body.

26. An optical body as recited in claim 25, wherein the at least one structured surface comprises at least one lens.

27. An optical body as recited in claim 23, wherein the at least one structured surface comprises an array of prismatic structures.

28. An optical body as recited in claim 23, wherein the inorganic fibers comprise at least glass fibers.

29. An optical body as recited in claim 23, wherein the inorganic fibers comprise at least ceramic fibers.

30. An optical body as recited in claim 23, wherein the inorganic fibers comprise at least glass-ceramic fibers.

31. An optical body as recited in claim 23, wherein the polymer matrix is birefringent, the polymer matrix having a third refractive index different from the first refractive index.

32. An optical body as recited in claim 23, wherein polymer matrix is substantially isotropic.

33. An optical body as recited in claim 23, wherein the inorganic fibers are arranged in tows within the polymer matrix.

34. An optical body as recited in claim 23, wherein the inorganic fibers are arranged as at least one fiber weave within the polymer matrix.

35. An optical body as recited in claim 34, wherein the inorganic fibers are included within at least one of the warp and the weft of the fiber weave, and at least one of the warp and the weft of the fiber weave comprises at least one of polymer fibers and natural fibers.

36. An optical body as recited in claim 35, wherein the inorganic polymer fibers comprise birefringent polymer material.

37. An optical body as recited in claim 23, wherein the inorganic fibers are embedded within the polymer matrix without a binding agent to bind the inorganic fibers to the matrix.

38. An optical body as recited in claim 23, wherein at least one of the inorganic fibers is formed in a yarn with one or more polymeric fibers.

39. An optical body as recited in claim 38, wherein the yarn is formed with a centrally positioned inorganic fiber and two or more polymeric fibers twisted around the centrally positioned inorganic fiber.

40. An optical body as recited in claim 23, further comprising an additive within the polymer matrix, the additive effectively adjusting the refractive index of the polymer matrix.

41. An optical body as recited in claim 23, further comprising an additive within the polymer matrix, the additive effectively increasing the strength of the polymer matrix.

42. An optical body as recited in claim 23, further comprising light diffusing particles within the polymer matrix.

43. An optical body as recited in claim 23, wherein the polymer matrix comprises a UV-cured acrylate.

44. An optical body as recited in claim 23, wherein the polymer matrix comprises a cross-linkable material.