Optical waveguide and luminaire incorporating same

• US 10,436,969 B2
• Filed: 03/15/2013
• Issued: 10/08/2019
• Est. Priority Date: 01/30/2013
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Inventors: Yuan, Zongjie, Wilcox, Kurt S., Tarsa, Eric J., Rol, Fabian Jean-Daniel, Ibbetson, James, Keller, Bernd P., Medendorp, Jr., Nicholas W.
• Primary Examiner(s): Sufleta, II, Gerald J
• Application Number:
  US13/840,563
• Publication Number:
  US 20140211495A1
• Time in Patent Office: 2,398 Days
• Field of Search: 362612, 362615-616
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21K 9/61 using light guides
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0028 Light guide, e.g. taper
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0035 provided on the surface of the light guide or in the bulk of it
• CPC Class Codes: G02B 6/0036 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0041 provided in the bulk of the light guide
• CPC Class Codes: G02B 6/0043 provided on the surface of the light guide
• CPC Class Codes: G02B 6/0046 Tapered light guide, e.g. wedge-shaped light guide
• CPC Class Codes: G02B 6/0058 varying in density, size, shape or depth along the light guide
• CPC Class Codes: G02B 6/0061 to provide homogeneous light output intensity
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package
• CPC Class Codes: G02B 6/009 of the light source in the package G02B6/0021 takes precedence

Abstract

An optical waveguide includes a body of optically transmissive material having a width substantially greater than an overall thickness thereof. The body of material has a first side, a second side opposite the first side, and a plurality of interior bores extending between the first and second sides each adapted to receive a light emitting diode. Extraction features are disposed on the second side and the extraction features direct light out of at least the first side and at least one extraction feature forms a taper disposed at an outer portion of the body.

Claims

1. An optical waveguide, comprising

a body of optically transmissive material comprising a width greater than an overall thickness thereof and comprising a first side, a second side opposite the first side, a plurality of interior coupling cavities extending between the first and second sides each adapted to receive a light emitting diode, and extraction features on the second side;

and

a plurality of location structures extending from the second side, wherein the plurality of location structures are disposed on a particular extraction feature of the extraction features on the second side;

wherein the extraction features are adapted to direct light out of at least the first side and wherein at least one extraction feature forms a taper disposed at an outer portion of the body between the first side and the second side;

wherein the thickness of the body tapers overall from a center to an outside edge thereof;

wherein each extraction feature comprises a trough, each trough comprising a depth from the second side;

wherein a first plurality of consecutive extraction features each comprise a first depth from the second side;

wherein a second plurality of extraction features each comprise varying depths from the second side such that each varying depth is different from the first depth; and

wherein the first plurality of consecutive extraction features is disposed closer to the respective interior coupling cavity than the second plurality of extraction features.

2. The optical waveguide of claim 1, further comprising a light diverter extending into each interior coupling cavity for diverting light into and along the width of the body of material.

3. The optical waveguide of claim 2, wherein the light diverter comprises a reflective conical plug member.

4. The optical waveguide of claim 3, wherein the reflective conical plug member is circular in a dimension transverse to the width and thickness of the body of material.

5. The optical waveguide of claim 1, wherein the first side is planar.

6. The optical waveguide of claim 1, wherein each interior coupling cavity extends fully through the body of material.

7. The optical waveguide of claim 1, in combination with LEDs disposed in the interior coupling cavities.

8. The optical waveguide of claim 7, wherein the LEDs develop greater than 1000 lumens.

9. The optical waveguide of claim 7, wherein the LEDs develop between 1000 and 50,000 lumens.

10. The optical waveguide of claim 7, wherein the LEDs develop between 20,000 and 50,000 lumens.

11. The optical waveguide of claim 7, wherein the LEDs develop between 5000 and 20,000 lumens.

12. The optical waveguide of claim 7, wherein the LEDs develop between 2000 and 8000 lumens.

41. The optical waveguide of claim 7, wherein the LEDs develop between 1000 and 3000 lumens.

13. An optical waveguide assembly, comprising

a plurality of waveguides each comprising a body of optically transmissive material comprising a width greater than an overall thickness thereof and comprising a first side, a second side opposite the first side, and extraction features on the second side, and wherein at least one of the waveguides comprises an interior recess extending between the first and second sides and adapted to receive a light emitting diode;

wherein the extraction features are adapted to direct light out of the first side and wherein at least one extraction feature is disposed at an outer portion of each body;

wherein each extraction feature comprises a trough and a ridge, each trough comprising a depth from the second side and each ridge comprising an elevation from the first side;

wherein a first plurality of consecutive extraction features comprises a first particular ridge elevation and varying trough depth; and

wherein a second plurality of consecutive extraction features comprises a particular trough depth and a second particular ridge elevation that is less than the first particular ridge elevation;

wherein the first and second pluralities of consecutive extraction features abut one another; and

wherein each waveguide of the plurality of waveguides is rotatably mounted such that illumination is determined by both an arrangement of the extraction features and an orientation of each waveguide of the plurality of waveguides.

14. The optical waveguide assembly of claim 13, wherein the waveguides are integral with one another.

15. The optical waveguide assembly of claim 13, wherein the waveguides are separate from one another.

16. The optical waveguide assembly of claim 15, wherein each waveguide is mounted on a gimbal and the waveguides can be positioned relative to one another.

17. The optical waveguide assembly of claim 13, wherein each waveguide comprises a first thickness at the interior recess and a second thickness less than the first thickness at an edge thereof.

18. The optical waveguide assembly of claim 13, wherein the body of optically transmissive material comprises multiple interior recesses and at least one LED is disposed in each interior recess.

19. The optical waveguide assembly of claim 13, wherein one of the waveguides is edge-lit by an additional LED.

20. The optical waveguide assembly of claim 13, further comprising a material disposed at at least one of two locations comprising a first location between adjacent waveguides and a second location at a perimeter of the optical waveguide assembly.

21. The optical waveguide assembly of claim 20, wherein the material is air.

22. The optical waveguide assembly of claim 20, wherein the material is a reflective material.

23. The optical waveguide assembly of claim 22, wherein the reflective material is a specular material.

24. The optical waveguide assembly of claim 22, wherein the reflective material is a diffuse material.

25. The optical waveguide assembly of claim 22, wherein the reflective material is a dielectric material.

26. The optical waveguide assembly of claim 20, wherein each waveguide body comprises a particular index of refraction and wherein the material comprises the particular index of refraction.

27. The optical waveguide assembly of claim 20, wherein each waveguide body comprises a particular index of refraction and wherein the material comprises other than the particular index of refraction.

28. The optical waveguide assembly of claim 20, wherein the waveguide bodies are disposed in an environment comprising a particular index of refraction and wherein the material comprises the particular index of refraction.

29. The optical waveguide assembly of claim 20, wherein the waveguide bodies are disposed in an environment comprising a particular index of refraction and wherein the material comprises other than the particular index of refraction.

30. The optical waveguide assembly of claim 22, wherein the material of at least one of the bodies is an opaque material.

38. The optical waveguide assembly of claim 13, wherein at least one of the waveguides comprises asymmetric extraction features.

39. The optical waveguide assembly of claim 13, wherein at least some of the waveguides comprise asymmetric extraction features.

40. The optical waveguide assembly of claim 39, wherein at least one of the waveguides comprises symmetric extraction features.

31. An optical waveguide luminaire, comprising:

a plurality of modular tiles, each tile comprising;

a planar waveguide body comprising a first surface,

one or more interior recesses disposed in the planar waveguide body,

LEDs extending into the one or more interior recesses,

light diverters disposed in the one or more interior recesses and adapted to direct light developed by the LEDs transversely into the waveguide body, and

extraction features disposed in the first surface and adapted to extract light out of the first surface;

a first plurality of extraction features disposed about a first interior recess wherein the first plurality of extraction features meet at square corners;

a second plurality of extraction features disposed about a second interior recess wherein the second plurality of extraction features meet at rounded corners; and

a mounting structure rotatably connecting each modular tile to a supporting structure;

wherein illumination is determined by both an arrangement of the extraction features on each planar waveguide body and an orientation of each modular tile of the optical waveguide luminaire.

32. The optical waveguide luminaire of claim 31, wherein each modular tile comprises four interior recesses.

33. The optical waveguide luminaire of claim 32, further comprising a reflective layer adjacent a second surface opposite the first surface.

34. The optical waveguide luminaire of claim 33, further comprising a circuit board substrate to which the LEDs are connected and wherein the reflective layer is adjacent the circuit board substrate.

35. The optical waveguide luminaire of claim 31, wherein the frame comprises cross members that are transparent.

36. The optical waveguide luminaire of claim 31, wherein the frame comprises cross members that are translucent.

37. The optical waveguide luminaire of claim 31, wherein the frame comprises cross members that are opaque.