Illumination device with side emitting light guide

• US 6,267,492 B1
• Filed: 04/15/1999
• Issued: 07/31/2001
• Est. Priority Date: 04/15/1999
• Status: Expired due to Fees

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Lundin, David J., Reid, Thomas J.
• Primary Examiner(s): O'Shea, Sandra
• Assistant Examiner(s): Alavi, Ali
• Application Number:
  US09/293,562
• Time in Patent Office: 838 Days
• Field of Search: 362/551, 362/560, 362/577, 362/581, 362/269, 362/232, 362/287, 385/901
• US Class Current: 362/551
• CPC Class Codes: G02B 6/0008 the light being emitted at the end of the fibre
• 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: Y10S 385/901 Illuminating or display apparatus

Abstract

Side emitting light guides are provided in connection with illumination devices, light guide systems, and tasklight illumination kits. The side emitting light guides may be provide bright directional light, or they may be provide diffuse light. The side emitting light guides may be flexible to allow for insertion into tortuous passageways. The light guides may also have a relatively small profile and/or a solid core. The light guides may also include shades that allow an operator to convert the light guides from side emitting to end emitting in order to provide brighter, more focused illumination in a particular area to perform some tasks. When completed, the user has the option of re-configuring the light guides for side emission to provide general area illumination.

Claims

1. An illumination device comprising:

a light source;

a light guide extending along a longitudinal axis, the light guide comprising;

a solid core;

an input end adapted for connection to the light source; and

a light emitting region directing light traveling though the light guide

from the light source out of at least a portion of at least one surface of

the light guide in a direction generally transverse to the longitudinal

axis;

wherein the light source and the light guide are rotatably connected such that the light emitting region of the light guide can be rotated relative to the light source about the longitudinal axis.

3. A device according to claim 1, wherein the light emitting region has a length along the longitudinal axis that is less than a total length of the light guide along the longitudinal axis.

4. A device according to claim 1, wherein the light emitting region of the light guide emits light with a lateral angular distribution of less than 360 degrees.

5. A device according to claim 1, wherein the light emitting region of the light guide emits light with a lateral angular distribution of about 180 degrees or less.

6. A device according to claim 1, wherein the light guide further comprises a glare shield.

7. A device according to claim 6, wherein the glare shield is fixedly attached to the light guide.

8. A device according to claim 1, wherein the light emitting region comprises an extraction mechanism selected from the group of a plurality of structured elements on a surface of the light guide, an optically rough surface, and an extraction strip.

9. A device according to claim 1, further comprising a shade movable between a closed position wherein the shade is located over substantially all of the light emitting region and an open position wherein the shade is removed from substantially all of the light emitting region.

10. A device according to claim 9, wherein the light guide comprises a distal end, and further wherein the distal end of the light guide emits light traveling through the light guide from the light source.

11. A device according to claim 1, wherein the light guide comprises a distal end, and further wherein the distal end of the light guide reflects substantially all of the light transmitted to the distal end from the light source.

2. A task light comprising:

a light source;

a light guide extending along a longitudinal axis, the light guide comprising;

a solid core;

an input end adapted for connection to the light source; and

a light emitting region directing light traveling though the light guide

from the light source out of at least a portion of at least one surface of

the light guide in a direction generally transverse to the longitudinal

axis;

wherein the light source and the light guide are rotatably connected such that the light emitting region of the light guide can be rotated relative to the light source about the longitudinal axis.

12. A worklight comprising:

a light source;

a light guide extending along a longitudinal axis, the light guide comprising;

a solid core;

an input end adapted for connection to the light source; and

a light emitting region directing light traveling though the light guide

from the light source out of at least a portion of at least one surface of

the light guide in a direction generally transverse to the longitudinal

axis;

wherein the light source and the light guide are rotatably connected such that the light emitting region of the light guide can be rotated relative to the light source about the longitudinal axis.

13. An illumination kit for an illumination device comprising:

a first light guide comprising

a solid core extending along a longitudinal axis;

an input end adapted for connection to a light source;

a light emitting region directing light traveling through the light guide from the light source out of at least a portion of at least one surface of the light guide in a direction generally transverse to the longitudinal axis, the emitted light having a first lateral angular distribution;

a second light guide comprising

a solid core extending along a longitudinal axis;

an input end adapted for connection to a light source;

a light emitting region directing light traveling through the light guide from the light source out of at least a portion of at least one surface of the light guide in a direction generally transverse to the longitudinal axis, the emitted light having a second lateral angular distribution.

25. A kit according to claim 13, further comprising a light source adapted for connection to the input ends of the first and second light guides.

29. A kit according to claim 13, wherein the first lateral angular distribution is about 360 degrees.

30. A kit according to claim 29, wherein the second lateral angular distribution is less than the first lateral angular distribution.

31. A kit according to claim 13, wherein a cross-sectional profile of the first light guide is different than a cross-sectional profile of the second light guide.

32. A kit according to claim 13, wherein the light emitting region of the first light guide has a length along the longitudinal axis that is different than a length of the light emitting region of the second light guide along its longitudinal axis.

33. A kit according to claim 13, wherein the light emitting regions of each of the first and second light guides comprises an extraction mechanism selected from the group of a plurality of structured elements on a surface of the light guide, an optically rough surface, and an extraction strip.

34. A kit according to claim 13, further comprising at least one shade movable between a closed position wherein the shade is located over substantially all of the light emitting region of one of the first and second light guides and an open position wherein the shade is removed from substantially all of the light emitting region of the light guide.

14. A light guide system comprising:

a solid core extending along a longitudinal axis, the core comprising;

an input end adapted for connection to a light source; and

a light emitting region directing light traveling through the core out of at least a portion of at least one surface of the core in a direction generally transverse to the longitudinal axis; and

a shade movable between a closed position wherein the shade is located over substantially all of the light emitting region and an open position wherein the shade is removed from substantially all of the light emitting region.

15. A system according to claim 14, wherein the shade comprises at least one sleeve collapsible along the length of the core.

16. A system according to claim 15, wherein the sleeve is fixedly attached to at least a portion of the core.

17. A system according to claim 15, wherein the sleeve comprises a window that is substantially optically transparent to light emitted from the light emitting region.

18. A system according to claim 17, wherein the window comprises a void in the sleeve.

19. A system according to claim 17, wherein the window and the light emitting region emit light with a lateral angular distribution of less than 360 degrees.

20. A system according to claim 17, wherein the window and the light emitting region emit light with a lateral angular distribution of about 180 degrees or less.

21. A system according to claim 14, wherein the shade comprises a plurality of sleeves, each of the sleeves being collapsible along the length of the core.

22. A system according to claim 21, wherein a first sleeve in the plurality of sleeves is substantially opaque over substantially all of its surface to light emitted from the light emitting region of the core, and further wherein a second sleeve in the plurality of sleeves comprises a window that is substantially optically transparent to light emitted from the light emitting region of the core.

23. A system according to claim 22, wherein the light emitting region extends over substantially the length of the core.

24. A system according to claim 14, wherein the core comprises a distal end, and further wherein the distal end of the core emits light traveling through the core from a light source.

26. A system according to claim 14, wherein the light emitting region of the core emits light with a lateral angular distribution of 360 degrees.

27. A system according to claim 14, wherein the light emitting region of the core emits light with a lateral angular distribution of less than 360 degrees.

28. A system according to claim 14, wherein the light emitting region comprises an extraction mechanism selected from the group of a plurality of structured elements on a surface of the core, an optically rough surface, and an extraction strip.