Fiber optic light panel assemblies and method of manufacture

• US 6,874,925 B2
• Filed: 03/06/2003
• Issued: 04/05/2005
• Est. Priority Date: 03/06/2003
• Status: Active Grant

• Current Assignee: Lumitex Incorporated
• Original Assignee: Lumitex Incorporated
• Inventors: Diamond, Joseph Lee, Larson, David B., Page, David J.
• Primary Examiner(s): O'Shea, Sandra
• Assistant Examiner(s): Tsidulko, Mark
• Application Number:
  US10/382,379
• Publication Number:
  US 20040174715A1
• Time in Patent Office: 761 Days
• Field of Search: 362/554, 362/551, 362/556, 362/560, 385/900, 385/901, 385/117, 385114-116, 385/14, 385/120, 385/121, 313/372
• US Class Current: 362/554
• CPC Class Codes: G02B 6/0008 the light being emitted at the end of the fibre
• CPC Class Codes: G02B 6/08 with fibre bundle in form of plate

Abstract

Fiber optic light panel assemblies include a panel member having one or more layers of individual optical fibers arranged in close proximity to each other. One or more of the optical fibers may be completely severed adjacent the light receiving end of the panel member to prevent any light entering the light receiving end from being transmitted through the severed optical fibers. At least some of the severed optical fibers may extend along one or more side edges of the panel member and/or intermediate the side edges. A slot may extend through an unlighted end of the panel member toward the light receiving end intermediate the side edges that sever a number of the optical fibers at the innermost end of the slot. The panel member may also be cut into a plurality of smaller width panel sections to provide gaps between the panel sections. One or both ends of the panel member (including any smaller width panel sections) and/or any severed ends of the optical fibers may be masked with a light absorbent material to absorb any light emitted therefrom.

Claims

1. A fiber optic light panel assembly comprising a light emitting panel member having one or more layers of individual optical fibers in close proximity to each other, the panel member having at least one light receiving end and opposite side edges, at least some of the optical fibers having protruding ends extending outwardly beyond the light receiving end for receiving light from an associated light source, one or more of the optical fibers that protrude beyond the light receiving end being completely severed adjacent the light receiving end to prevent any light entering the protruding ends of the severed optical fibers from being transmitted through the severed optical fibers beyond where the optical fibers are severed.

2. The assembly of claim 1 wherein at least some of the severed optical fibers extend along at least one of the side edges of the panel member.

3. The assembly of claim 2 wherein at least some of the severed optical fibers extend along both side edges of the panel member.

4. The assembly of claim 2 wherein additional optical fibers adjacent the one side edge have protruding ends extending outwardly beyond the light receiving end that are completely severed in axial spaced relation from the light receiving end to prevent any light entering the protruding ends of the additional optical fibers from being transmitted through the additional optical fibers beyond where the additional optical fibers are severed.

5. The assembly of claim 4 wherein the severed ends of the additional optical fibers are masked with a light absorbent material to absorb any light exiting from the severed ends of the additional optical fibers.

6. The assembly of claim 4 wherein the panel member is narrower along the one side edge axially beyond the severed ends of the additional optical fibers.

7. The assembly of claim 1 wherein at least some of the severed optical fibers extend along at least one side edge of the panel member which provide an unlighted area along the one side edge beyond where the optical fibers are severed.

8. The assembly of claim 1 wherein at least some of the severed optical fibers are inwardly spaced from the side edges.

9. The assembly of claim 1 wherein at least the optical fibers that are not severed have protruding ends that extend outwardly beyond the light receiving end of the panel member and are bundled together into at least one light cable for transmitting light from at least one light source to the panel member.

10. The assembly of claim 9 wherein every other one or more of the protruding ends of the optical fibers are grouped together to form at least two light cables to compensate for any color differences or light output differences from at least two different light sources.

11. The assembly of claim 10 wherein alternate pairs of the protruding ends of the optical fibers are grouped together to form two light cables to compensate for any color differences or light output differences from two light sources.

12. The assembly of claim 9 wherein the protruding ends of the optical fibers are heat formed to maintain the protruding ends in a compact shape in close proximity to the light receiving end of the panel member.

13. The assembly of claim 12 wherein the protruding ends of the optical fibers are heat formed to maintain a ferrule attached to the protruding ends at a desired position and orientation in close proximity to the light receiving end of the panel member.

14. The assembly of claim 12 wherein a ferrule is attached to the protruding ends of the optical fibers which vary in length.

15. The assembly of claim 14 wherein the protruding ends of the optical fibers have a bend radius that is at least two times the diameter of the optical fibers.

16. The assembly of claim 15 wherein the protruding ends of the optical fibers extend outwardly beyond the light receiving end of the panel member a distance no more than one-half the width of the panel member.

17. The assembly of claim 9 wherein at least some of the severed optical fibers do not have ends protruding outwardly beyond the light receiving end of the panel member.

18. The assembly of claim 1 wherein at least some of the severed optical fibers are inwardly spaced from the side edges, and at least one hole extends through at least some of the severed optical fibers intermediate the ends of the panel member.

19. The assembly of claim 18 wherein an elongated hole extends through at least some of the severed optical fibers in axial spaced relation from the hole.

20. The assembly of claim 1 wherein the panel member has an unlighted end opposite the light receiving end, further comprising a slot extending through the unlighted end toward the light receiving end of the panel member intermediate the width of the panel member, the slot terminating short of the light receiving end.

21. The assembly of claim 20 wherein a plurality of the optical fibers have severed ends at the innermost end of the slot.

22. The assembly of claim 21 wherein the severed ends of the optical fibers at the innermost end of the slot are masked with a light absorbent material to absorb any light that is emitted by the masked severed ends.

23. The assembly of claim 21 wherein the slot has side edges, and one or more of the optical fibers that extend along the side edges of the slot are completely severed at the innermost end of the slot to prevent any light from being transmitted through the severed optical fibers along the side edges of the slot.

24. The assembly of claim 23 wherein the severed ends of the optical fibers at the innermost end of the slot and the severed ends of the optical fibers that extend along the side edges of the slot are masked with a light absorbent material to absorb any light that is emitted by the masked severed ends.

25. The assembly of claim 1 wherein the panel member is cut into a plurality of smaller width panel sections to provide gaps between the panel sections for receipt of mechanical elements of a device between such panel sections, the panel sections having protruding optical fiber ends that are all bundled together into at least one light cable for transmitting light from at least one light source to the panel sections.

26. The assembly of claim 25 wherein the panel member is cut using a wire or other blunt instrument to prevent damaging the optical fibers adjacent where the panel member is cut.

27. The assembly of claim 25 wherein at least some of the severed optical fibers extend along the cut side edges of the panel sections.

28. The assembly of claim 1 further comprising a back reflector adjacent one side of the panel member for reflecting light exiting the one side back out the other side.

29. The assembly of claim 28 wherein the layer of optical fibers are adhered to one side of the back reflector.

30. The assembly of claim 29 further comprising a mask of light absorbent material covering a portion of the other side of the panel member adjacent the light receiving end to absorb any light emitted by such portion.

31. The assembly of claim 30 wherein the light absorbent material comprises a strip of black tape adhered to the portion of the other side of the panel member.

32. The assembly of claim 1 wherein the panel member has an unlighted end opposite the light receiving end, and the optical fibers have distal ends terminating at the unlighted end of the panel member that are masked by a light absorbent material to absorb any light emitted from the distal ends.

33. The assembly of claim 32 wherein the light absorbent material comprises a coating of black paint or ink on the distal ends of the optical fibers and black tape covering the coating and adhered to opposite sides of the unlighted end of the panel member.

34. The assembly of claim 33 further comprising a clear coat on the distal ends of the optical fibers beneath the coating of black paint or ink which prevents the black paint or ink from wicking between the distal ends of the optical fibers.

35. The assembly of claim 33 wherein the black tape is heat formed to conform to opposite sides of the unlighted end of the panel member.

36. A fiber optic light panel assembly comprising a light emitting panel member having one or more layers of individual optical fibers in close proximity to each other, the panel member having a light receiving end and an unlighted end opposite the light receiving end, and a slot extending through the unlighted end toward the light receiving end intermediate the width of the panel member, the slot terminating short of the light receiving end.

37. The assembly of claim 36 wherein a plurality of the optical fibers have severed ends at an innermost end of the slot, the severed ends of the optical fibers at the innermost end of the slot being masked with a light absorbent material to absorb any light that is emitted by the masked severed ends.

38. The assembly of claim 36 wherein the slot has side edges, and one or more of the optical fibers that extend along the side edges of the slot are completely severed at the innermost end of the slot to prevent any light from being transmitted through the severed optical fibers along the side edges of the slot.

39. The assembly of claim 38 wherein the severed ends of the optical fibers that extend along the side edges of the slot are masked with a light absorbent material to absorb any light that is emitted by the masked severed ends.

40. A fiber optic light panel assembly comprising a light emitting panel member having one or more layers of individual optical fibers in close proximity to each other, the panel member having at least one light receiving end, at least some of the optical fibers having protruding ends that extend outwardly beyond the light receiving end of the panel member, alternate pairs of the protruding ends of the optical fibers being grouped together in at least two groups to form at least two light cables to compensate for any color differences or light output differences from at least two light sources that supply light to the light cables.

41. The assembly of claim 40 wherein the protruding ends of the optical fibers are heat formed to maintain the protruding ends in a compact shape in close proximity to the light receiving end of the panel member and to maintain ferrules attached to the protruding ends at a desired position and orientation in close proximity to the light receiving end.

42. The assembly of claim 41 wherein the protruding ends of the optical fibers vary in length.

43. The assembly of claim 41 wherein the protruding ends of the optical fibers are heat formed into a compact shape that does not extend outwardly beyond the light receiving end more than one-half the width of the light panel.

44. The assembly of claim 43 wherein the protruding ends of the optical fibers have a bend radius that is at least two times the diameter of the optical fibers.

45. A fiber optic light panel assembly comprising a light emitting panel member having one or more layers of individual optical fibers in close proximity to each other, the panel member having at least one light receiving end, at least some of the optical fibers having protruding ends extending outwardly beyond the light receiving end that are bundled together to form at least one light cable that is heat formed into a compact shape that does not extend outwardly beyond the light receiving end more than one-half the width of the light panel.

46. The assembly of claim 45 wherein the protruding ends of the optical fibers vary in length.

47. The assembly of claim 45 wherein the protruding ends of the optical fibers have a bend radius that is at least two times the diameter of the optical fibers.

48. A fiber optic light panel assembly comprising a light emitting panel member having one or more layers of individual optical fibers in close proximity to each other, the panel member having proximal and distal ends and opposite side edges, the optical fibers having distal ends terminating at the distal end of the panel member and proximal ends extending outwardly beyond the proximal end of the panel member for transmitting light from a light source to the panel member, a coating of black paint or ink on the distal ends of the optical fibers to absorb any light emitted from the distal ends, and a clear coat on the distal ends beneath the coating of black paint or ink which prevents the black paint or ink from wicking between the distal ends of the optical fibers.

49. The assembly of claim 48 further comprising black tape overlying the coating of black paint or ink and adhered to opposite sides of the distal end of the panel member.

50. A method of making a fiber optic panel assembly comprising the steps of providing a panel member having one or more layers of individual optical fibers arranged in close proximity to each other, at least one light receiving end and opposite side edges, at least some of the optical fibers having protruding ends extending outwardly beyond the light receiving end for receiving light from an associated light source, and completely severing one or more of the protruding ends of the optical fibers adjacent the light receiving end to prevent any light entering the protruding ends of the severed optical fibers from being transmitted through the severed optical fibers beyond where the optical fibers are severed.

51. The method of claim 50 wherein at least some of the severed optical fibers extend along at least one of the side edges of the panel member.

52. The method of claim 50 wherein the optical fibers have protruding ends extending outwardly beyond the light receiving end of the panel member, further comprising the steps of removing the protruding ends of at least some of the severed optical fibers, and bundling the remaining protruding ends of the optical fibers together into at least one light cable for transmitting light from at least one light source to the panel member.

53. The method of claim 50 wherein at least some of the severed optical fibers extend along at least one of the side edges of the panel member, further comprising the step of completely severing additional optical fibers adjacent at least one side edge in axial spaced relation from the light receiving end to prevent any light entering the light receiving end from being transmitted through the additional optical fibers beyond where the additional optical fibers are severed.

54. The method of claim 53 further comprising the step of masking the severed ends of the additional optical fibers with a light absorbent material to absorb any light exiting from the severed ends of the additional optical fibers.

55. The method of claim 50 wherein a plurality of the severed optical fibers are inwardly spaced from the side edges.

56. The method of claim 55 further comprising the step of cutting at least one hole through at least some of the severed optical fibers inwardly spaced from the side edges.

57. The method of claim 56 further comprising the step of cutting an elongated hole through at least some of the severed optical fibers in axial spaced relation from the hole.

58. The method of claim 50 further comprising the step of cutting the panel member into a plurality of smaller width panel sections, each of the panel sections having one or more optical fibers extending along the length of at least one of the side edges that are completely severed adjacent light receiving ends of the panel sections.

59. The method of claim 50 further comprising the step of masking a portion of one side of the panel member adjacent the light receiving end to absorb any light emitted by such portion.

60. The method of claim 50 wherein the panel member has an unlighted end opposite the light receiving end and the optical fibers have distal ends that terminate at the unlighted end, further comprising the steps of coating the distal ends of the optical fibers with a clear coat and then coating the clear coat with black paint or ink to absorb any light emitted by such distal ends.

61. The method of claim 60 further comprising the step of covering the black paint or ink with tape, adhering the tape to opposite sides of the unlighted end of the panel member, and heat forming the tape to conform to the opposite sides.

62. The method of claim 50 wherein the panel member has an unlighted end opposite the light receiving end, further comprising the step of cutting a slot in the panel member extending through the unlighted end toward the light receiving end which cuts completely through a plurality of the optical fibers at the innermost end of the slot, the slot terminating short of the light receiving end.

63. The method of claim 62 further comprising the step of masking the cut ends of the optical fibers at the innermost end of the slot with a light absorbent material to absorb any light emitted by the masked cut ends.

64. A method of making a fiber optic panel assembly comprising the steps of providing a panel member having one or more layers of individual optical fibers arranged in close proximity to each other with at least some of the optical fibers protruding beyond at least one end of the panel member, cutting the panel member into a plurality of smaller width panel sections to provide gaps between such panel sections for receipt of mechanical elements of a device with which the panel assembly is used to provide background illumination, and bundling together the protruding ends of the optical fibers extending beyond one end of more than one of the panel sections into at least one light cable for transmitting light from at least one light source to the panel sections.

65. The method of claim 64 further comprising the step of grouping together alternate pairs of the protruding ends of the optical fibers of all of the panel sections into at least two groups to form at least two light cables to compensate for any color differences or light output differences from at least two light sources used to supply light to the light cables.

66. The method of claim 65 wherein alternate pairs of the protruding ends of the optical fibers of all of the panel sections are grouped together into two groups to form two light cables to compensate for any color differences or light output differences from two light sources.

67. The method of claim 65 further comprising the step of heat forming the light cables to maintain the light cables in a compact shape in close proximity to the light receiving end of the panel member and to maintain ferrules attached to the outermost ends of the light cables at a desired position and orientation in close proximity to the light receiving end of the panel member.

68. A method of making a fiber optic panel assembly including a panel member having one or more layers of individual optical fibers arranged in close proximity to each other, the panel member having at least one light receiving end and opposite side edges, and at least some of the optical fibers having protruding ends extending outwardly beyond the light receiving end of the panel member, comprising the steps of pulling the protruding ends of the optical fibers through at least one ferrule, arranging the protruding ends and ferrule at a desired position and orientation in close proximity to the light receiving end, heat forming the protruding ends to retain the shape of the protruding ends and orientation of the ferrule in close proximity to the light receiving end, and crimping the ferrule onto the protruding ends.

69. The method of claim 68 wherein the protruding ends of the optical fibers vary in length, further comprising the step of cutting off the protruding ends of the optical fibers extending outwardly beyond the ferrule.

70. The method of claim 69 wherein the protruding ends of the optical fibers have a minimum bend radius at least two times the diameter of the optical fibers.

71. The method of claim 69 wherein the protruding ends of the optical fibers are heat formed into a compact shape in which the protruding ends do not extend outwardly beyond the light receiving end more than one-half the width of the light panel.