LED downlight

• US 8,070,328 B1
• Filed: 01/13/2009
• Issued: 12/06/2011
• Est. Priority Date: 01/13/2009
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Knoble, David W., Jamasbi, Khosrow, McMillin, Brian
• Primary Examiner(s): Husar, Stephen F
• Application Number:
  US12/352,750
• Time in Patent Office: 1,057 Days
• Field of Search: 362245-247, 362/249.02, 362/294, 362/308, 362/311.02, 362/343, 362/345, 362/364, 362/373
• US Class Current: 362/311.02
• 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 21/048 Mounting arrangements for fastening lighting devices to false ceiling frameworks
• CPC Class Codes: F21V 23/02 the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 7/0025 Combination of two or more reflectors for a single light source array of reflectors for a cluster of light sources F21V7/0083
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED downlight fixture comprises an array of LEDs in thermal connectivity with a heatsink, the array of LEDs positioned adjacent a first aperture of a multi-piece reflector assembly, the multi-piece reflector assembly including a first reflector having the first aperture disposed in an upper portion of the first reflector and an opposed larger second aperture in a lower portion of the first reflector, a second reflector having a first aperture positioned adjacent the second aperture of the first reflector and a second aperture opposite the first aperture of the second reflector and defining a light exit passageway, a diffuser positioned proximal to and extending across the second aperture of the first reflector and the first aperture of the second reflector.

Claims

1. An LED downlight fixture, comprising:

an array of LEDs in thermal connectivity with a heatsink, said array of LEDs positioned adjacent a first aperture of a multi-piece reflector assembly;

said multi-piece reflector assembly including;

a first reflector having said first aperture disposed in an upper portion of said first reflector and an opposed larger second aperture in a lower portion of said first reflector;

a second reflector having a first aperture positioned adjacent said second aperture of said first reflector and a second aperture opposite said first aperture of said second reflector and defining a light exit passageway;

a diffuser positioned proximal to and extending across said second aperture of said first reflector and said first aperture of said second reflector.

2. The LED downlight fixture of claim 1, wherein said heatsink has a plurality of fins positioned external to said reflector assembly.

3. The LED downlight fixture of claim 1, wherein each LED of said array of LEDs is surrounded by an LED reflector.

4. The LED downlight fixture of claim 1, wherein said second reflector is attached to said first reflector.

5. The LED downlight fixture of claim 1, wherein said diffuser is engaging said first reflector and extends across said second aperture of said first reflector.

6. The LED downlight fixture of claim 5, wherein said second reflector is attached to said diffuser.

7. The LED downlight fixture of claim 1, wherein said diffuser is attached to said second reflector and extends across said first aperture of said second reflector.

8. The LED downlight fixture of claim 1, wherein a support frame is attached to said heatsink and the exterior of said second reflector.

9. The LED downlight fixture of claim 1, wherein said first aperture of said first reflector, said second aperture of said first reflector, said diffuser, and said first and second aperture of said second reflector are all vertically aligned.

10. A LED downlight fixture, comprising:

an LED array having a plurality LEDs in thermal communication with a heat sink;

a reflector assembly having a first reflector portion and a second reflector portion, said reflector assembly having;

a first reflector including an upper aperture and a lower aperture;

a second reflector including a second upper aperture and a second lower aperture;

said second upper aperture of said second reflector aligned with said lower aperture of said first reflector;

a diffuser captured between said first reflector and said second reflector and substantially aligned with said lower aperture of said first reflector and said upper aperture of said lower second reflector;

said LEDs aligned with said upper aperture of said first reflector and said heat sink extending radially above an outer surface of said first reflector.

11. The LED downlight fixture of claim 10 further comprising a non-conductive lens between said LED array and said upper aperture of said first reflector.

12. The LED downlight fixture of claim 10 further comprising a mounting ring positioned on one of said first reflector and said second reflector.

13. The LED downlight fixture of claim 12, said diffuser positioned in said mounting ring.

14. The LED downlight fixture of claim 10, said first reflector and said second reflector defining a light exit passageway.

15. The LED downlight fixture of claim 14, said diffuser positioned in said light exit passageway.

16. A LED downlight fixture, comprising:

an array of LEDs defined by a plurality of LEDs, said LEDs in thermal communication with a heat sink;

a reflector assembly having a first reflector portion and a second reflector portion,

said reflector assembly defining a light exit passageway;

said first reflector having a first upper aperture and a second lower aperture;

said second reflector having a first upper aperture and a second lower aperture;

said array of LEDs positioned over said first upper aperture of said first reflector;

a diffuser connected to one of said first reflector and said second reflector and disposed within said reflector assembly and in alignment with said second lower aperture of said first reflector and said first upper aperture of said second reflector;

said heat sink having a plurality of radially extending fins, positioned above said reflector assembly.

17. The LED downlight fixture of claim 16, said LED array further comprising a circuit board.

18. The LED downlight fixture of claim 17 further comprising a lens disposed over between said LED array and said reflector assembly inhibit contact between said LED array and said reflector assembly.

19. An LED downlight fixture, comprising:

an LED array formed of a plurality of LEDs, said LED array positioned in thermal communication with a heat sink;

a reflector having an upper opening and a lower opening, said LED array disposed adjacent said upper opening;

a diffuser positioned a preselected spaced distance from said LED array;

said diffuser positioned one of above a lowermost edge reflector or beneath said lowermost edge of said reflector; and

,

a lens disposed between said LED array and an uppermost edge of said reflector.

20. The LED downlight fixture of claim 19, said diffuser connected to a spacer element, said spacer element connected to said reflector.

21. The LED downlight fixure of claim 19, said diffuser affixed to an interior of said reflector.