DOOR FRAME TROFFER

• US 20140268692A1
• Filed: 03/14/2013
• Published: 09/18/2014
• Est. Priority Date: 03/14/2013
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Edmond, Mark, Lu, Dong, Pickard, Paul
• Granted Patent: US 10,648,643 B2
• Time in Patent Office: Days
• US Class Current: 362/145
• CPC Class Codes: A47G 19/2255 Details related to the connection between the liquid containing part and the supporting part
• CPC Class Codes: F21S 10/002 using liquids, e.g. water
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• CPC Class Codes: F21S 6/002 Table lamps, e.g. for ambient lighting
• CPC Class Codes: F21S 8/026 intended to be recessed in a ceiling or like overhead structure, e.g. suspended ceiling
• CPC Class Codes: F21V 13/04 the elements being reflectors and refractors for vehicle rear lights F21S43/40
• CPC Class Codes: F21V 5/008 Combination of two or more successive refractors along an optical axis
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21V 7/005 with an elongated shape to cooperate with linear light sources
• CPC Class Codes: F21V 9/12 with liquid-filled chambers
• CPC Class Codes: F21W 2121/00 Use or application of lighting devices or systems for decorative purposes, not provided for in codes F21W2102/00 – F21W2107/00
• CPC Class Codes: F21Y 2107/00 Light sources with three-dimensionally disposed light-generating elements
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G09F 13/04 Signs, boards or panels, illuminated from behind the insignia

Abstract

An indirect troffer. Embodiments of the present invention provide a troffer-style fixture that is particularly well-suited for use with solid state light sources, such as LEDs. The troffer comprises light bars mounted proximate to a back reflector. A back reflector defines a reflective interior surface of the lighting troffer. To facilitate thermal dissipation, the light bar can act as a heat sink. A portion of the heat sink is exposed to the ambient room environment while another portion functions as a mount surface for the light sources that faces the back reflector. One or more light sources disposed along the light bar mount surface emit light into an interior cavity where it can be mixed and/or shaped prior to emission. In some embodiments, one or more lens plates extend from the light bar out to the back reflector.

Claims

1. A lighting troffer, comprising:

a housing comprising a door frame;

a back reflector; and

at least one light bar comprising a mount surface;

at least one light emitter on said mount surface; and

wherein the region between said at least one light light bar and said back reflector defines a mixing chamber.

2. The lighting troffer of claim 1, wherein said at least one light bar is attached to said door frame.

3. The lighting troffer of claim 1, wherein said mount surface is configured such that at least some light emitted from said at least one light emitter is initially incident on said back reflector.

4. The lighting troffer of claim 1, further comprising at least one lens plate, wherein said door frame at least partially holds said at least one lens plate in place.

5. The lighting troffer of claim 4, wherein said at least one lens plate attaches to said at least one light bar.

6. The lighting troffer of claim 4, wherein said at least one lens plate is faceted.

7. The lighting troffer of claim 4, wherein said at least one lens plate comprises a plurality of thin films.

8. The lighting troffer of claim 4, wherein said troffer provides an output having an intensity max/min ratio of less than about 3.5

9. The lighting troffer of claim 4, wherein said troffer provides an output having an intensity has a max/min ratio of less than about 3.

10. The lighting troffer of claim 1, wherein the majority of the visible surfaces of said troffer are luminous.

11. The lighting troffer of claim 1, wherein at least 75 percent of the visible surfaces of said troffer are luminous.

12. The lighting troffer of claim 1, wherein said back reflector comprises a diffuse white reflector.

13. The lighting troffer of claim 1, wherein said back reflector comprises a reflective coating on said housing.

14. The lighting troffer of claim 1, wherein the cross-section of said back reflector is substantially trapezoidal.

15. The lighting troffer of claim 1, wherein said back reflector comprises rounded corners.

16. The lighting troffer of claim 1, wherein said back reflector comprises a stepped surface.

17. The lighting troffer of claim 1, wherein said back reflector is textured.

18. The lighting troffer of claim 1, wherein said back reflector comprises a prismatic pattern.

19. The lighting troffer of claim 1, further comprising a plurality of light emitters on each of said at least one light bar.

20. The lighting troffer of claim 19, wherein some of said emitters have an emission pattern that is more omnidirectional than a Lambertian emission pattern.

21. The lighting troffer of claim 19, comprising blue-shifted yellow (BSY) and red emitters.

22. The lighting troffer of claim 1, wherein said mount surface comprises a first flat area and a second flat area;

wherein said at least one light emitter comprises a first emitter mounted on said first flat area and a second emitter mounted on said second flat area;

wherein said first flat area is configured such that at least some light emitted from said first emitter is initially incident on a first portion of said back reflector; and

wherein said second flat area is configured such that at least some light emitted from said second emitter is initially incident on a second portion of said back reflector.

23. The lighting troffer of claim 1, further comprising a plurality of LEDs on at least one light strip disposed on said mount surface such that said at least one light strip faces said back reflector.

24. The lighting troffer of claim 1, further comprising a plurality of LEDs on multiple light strips disposed on said mount surface such that said light strips face different portions of said back reflector.

25. The lighting troffer of claim 1, wherein said at least one light bar comprises a heat sink.

26. The lighting troffer of claim 25, further comprising at least one lens plate;

wherein said heat sink comprises at least one connection area;

wherein said at least one lens plate attaches to said heat sink in said connection area.

27. The lighting troffer of claim 1, wherein said door frame comprises a mount surface on which at least one light emitter can be mounted.

28. A lighting troffer, comprising:

a door frame;

a back reflector mounted to said door frame; and

at least one light bar mounted to said door frame and comprising a mount surface; and

a plurality of light emitters on said mount surface;

wherein the region between said at least one light light bar and said back reflector defines a mixing chamber.