Optical fiber light distribution system and method of manufacture and illumination

• US 6,137,928 A
• Filed: 01/29/1999
• Issued: 10/24/2000
• Est. Priority Date: 01/29/1999
• Status: Expired due to Fees

• Current Assignee: The Central Lighting Company
• Original Assignee: Richard E. Albrecht
• Inventors: Albrecht, Richard E.
• Primary Examiner(s): Phan, James
• Application Number:
  US09/240,221
• Time in Patent Office: 634 Days
• Field of Search: 385/31-33, 385/39, 385/123, 385/125, 385/129, 385/147, 362/551, 362/552, 362/559-561, 362/582
• US Class Current: 385/31
• CPC Class Codes: G02B 6/001 the light being emitted along at least a portion of the lateral surface of the fibre
• CPC Class Codes: G02B 6/2852 using tapping light guides arranged sidewardly, e.g. in a non-parallel relationship with respect to the bus light guides (light extraction or launching through cladding, with or without surface discontinuities, bent structures)

Abstract

An optical fiber light distribution system has a first optical fiber and a second optical fiber. The first optical fiber has a side surface, an axis, and a length. The second optical fiber is wrapped about the side surface such that the second optical fiber defines a plurality of wraps about the first optical fiber. The plurality of wraps have a pitch. Pitch is the distance between corresponding points of adjacent wraps measured parallel to the first optical fiber axis. When light is directed through the first optical fiber, portions of the light are extracted by portions of the second optical fiber that contact the first optical fiber. The lower the pitch of the plurality of wraps, the greater the percentage of light extracted into the second optical fiber from the first optical fiber. Further, softer first optical fibers which incur more deformation have increased contact surface with the second optical fiber. The increased contact surface results in an increased percentage of light being extracted into the second optical fiber. Cladding or potting may be used to inhibit light extraction. A process for making the optical fiber distribution system has the step of wrapping the second optical fiber about the first optical fiber. A process for illumination has the step of directing light through the optical fiber light distribution system.

Claims

1. An optical fiber light distribution system comprising:

a. a first optical fiber having a side surface, an axis, and a length; and

b. a second optical fiber wrapped about the side surface such that the second optical fiber defines a plurality of wraps about the first optical fiber and the plurality of wraps have a pitch, wherein the pitch is a distance between corresponding points of adjacent wraps measured parallel to the first optical fiber axis.

2. The optical fiber light distribution system of claim 1, wherein the pitch varies along the first optical fiber length.

3. The optical fiber light distribution system of claim 2, wherein the pitch increases along the first optical fiber length.

4. The optical fiber light distribution system of claim 2, wherein the pitch decreases along the first optical fiber length.

5. The optical fiber light distribution system of claim 1, wherein the first optical fiber has a diameter greater than a diameter of the second optical fiber.

6. The optical fiber light distribution system of claim 1, further comprising cladding disposed on a portion of the side surface of the first optical fiber.

7. The optical fiber light distribution system of claim 1, further comprising a light source functionally connected to the first optical fiber.

8. The optical fiber light distribution system of claim 1, wherein the first optical fiber and the second optical fiber are sized and arranged to emit a substantially even amount of light along a length of the optical fiber light distribution system for a predetermined intensity of light entering the first optical fiber.

9. The optical fiber light distribution system of claim 1, further comprising a securing system at least partially surrounding the first and second optical fibers.

10. An optical fiber light distribution system comprising:

a. a first optical fiber having a side surface, an axis, and a length; and

b. a second optical fiber wrapped about the side surface such that the second optical fiber defines a plurality of wraps about the first optical fiber and the plurality of wraps have a pitch, wherein the pitch is a distance between corresponding points of adjacent wraps measured parallel to the first optical fiber axis;

c. wherein the pitch decreases along the first optical fiber length; and

d. a first optical fiber diameter that is greater than a second optical fiber diameter.

11. The system of claim 10, further comprising a light source functionally connected to the first optical fiber.

12. The system of claim 10, further comprising cladding disposed on a portion of the side surface of the first optical fiber.

13. The system of claim 10, further comprising a light source functionally connected to the first optical fiber.

14. A process for manufacturing an optical fiber light distribution system comprising the steps of:

a. providing a first optical fiber having a side surface, an axis, and a length; and

b. wrapping a second optical fiber about the side surface such that the second optical fiber defines a plurality of wraps about the first optical fiber and the plurality of wraps have a pitch, wherein the pitch is a distance between corresponding points of adjacent wraps measured parallel to the first optical fiber axis.

15. The process of claim 14, wherein the pitch varies along the first optical fiber length.

16. The process of claim 15 wherein the pitch increases along the first optical fiber length.

17. The process of claim 15, wherein the pitch decreases along the first optical fiber length.

18. The process of claim 14, wherein the first optical fiber has a diameter greater than a diameter of the second optical fiber.

19. The process of claim 14, further comprising the step of applying cladding to a portion of the surface of the first optical fiber.

20. The process of claim 14, further comprising the step of functionally connecting a light source to the first optical fiber.

21. An illumination process comprising the steps of:

a. providing an optical fiber light distribution system comprising;

i. a first optical fiber having a side surface, an axis, and a length; and

ii. a second optical fiber wrapped about the side surface such that the second optical fiber defines a plurality of wraps about the first optical fiber and the plurality of wraps have a pitch, wherein the pitch is a distance between corresponding points of adjacent wraps measured parallel to the first optical fiber axis; and

b. directing light through the first optical fiber.