LED based high-intensity light with secondary diffuser

• US 8,651,695 B2
• Filed: 03/22/2011
• Issued: 02/18/2014
• Est. Priority Date: 03/26/2010
• Status: Active Grant

• Current Assignee: Excelitas Canada, Inc.
• Original Assignee: Excelitas Technologies Corporation (Excelitas Technologies Holdings LLC)
• Inventors: Fields, Craig, Kochman, Ken, Papanek, Tom, Brennan, Kevin
• Primary Examiner(s): BRUCE, DAVID VERNON
• Application Number:
  US13/053,649
• Publication Number:
  US 20110235322A1
• Time in Patent Office: 1,064 Days
• Field of Search: 362/145, 362/230, 362/237, 362/245, 362/246, 362/249.02
• US Class Current: 362/246
• CPC Class Codes: F21V 5/00 Refractors for light sources characterised by cooling arrangements F21V29/504
• 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: F21V 7/0058 adapted to cooperate with light sources of shapes different from point-like or linear, e.g. circular light sources
• CPC Class Codes: F21V 7/0083 Array of reflectors for a cluster of light sources, e.g. arrangement of multiple light sources in one plane combination of two or more reflectors F21V7/0025
• CPC Class Codes: F21W 2111/06 for aircraft runways or the like
• CPC Class Codes: F21Y 2103/33 annular
• CPC Class Codes: F21Y 2107/60 on stacked substrates
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A high intensity LED based lighting array for use in an obstruction light with efficient uniform light output is disclosed. The high intensity LED based lighting array has a ring assembly having a plurality of reflectors and light emitting diodes. The ring assembly has a planar surface mounting each of the plurality of primary reflectors in perpendicular relation to a respective one of the plurality of light emitting diodes. A secondary diffuser is positioned on the ring to mix light from the light emitting diodes to create a uniform light emission in a range of azimuth angles.

Claims

1. A light engine for a high intensity light comprising:

a first ring assembly having a first plurality of reflectors and light emitting diodes, the ring assembly having a planar surface mounting each of the plurality of reflectors in positional relation to a respective one of the plurality of light emitting diodes; and

a diffuser interposed around the first concentric ring assembly to mix light from at least some of the plurality reflectors and light emitting diodes.

2. The light engine of claim 1, further comprising a circular mounting device holding the diffuser.

3. The light engine of claim 2, wherein the mounting device has a circular beam blocking wall to prevent stray light from the light emitting diodes being emitted below a predetermined elevation angle.

4. The light engine of claim 1, further comprising a second, third and fourth concentric ring assembly mounted on the first ring assembly, each of the second, third and fourth ring assemblies having a plurality of reflectors and light emitting diodes and a diffuser element.

5. The light engine of claim 1, wherein the light engine is associated with a high intensity light designed to be compliant with FAA and ICAO standards for 20,000 cd lights or 2,000 cd lights.

6. The light engine of claim 1, wherein the first ring assembly includes a plurality of circuit boards mounting the light emitting diodes and a heat sink coupled to the plurality of circuit boards.

7. The light engine of claim 1, wherein the reflectors each form a horizontal beam approximately 5 to 10 degrees wide.

8. The light engine of claim 1, where the diffuser is used to reduce azimuth ripple from the light emitted by at least some of the plurality of light emitting diodes and reflectors.

9. The light engine of claim 1, wherein the diffuser is a Fresnel lens spreading the beams from the light emitting diodes in a horizontal direction but not in a vertical direction.

10. The light engine of claim 1, wherein the diffuser is a holographic plastic film having a diffusing pattern.

11. The light engine of claim 1, wherein the light emitting diodes emit either red or white light.

12. A high intensity light beacon designed to be compliant with FAA and ICAO standards, the light beacon comprising:

a first ring assembly having a first plurality of primary reflectors and light emitting diodes, the ring assembly having a planar surface mounting a first diffuser positioned in relation to the first plurality of primary reflectors and light emitting diodes, the first diffuser mixing the light from the first plurality of primary reflectors and light emitting diodes;

a second ring assembly mounted on the first ring assembly, the second ring assembly having a second plurality of primary reflectors and light emitting diodes, the second ring assembly having a planar surface mounting a second diffuser positioned in relation to the second plurality of primary reflectors and light emitting diodes, the second diffuser mixing the light from the second plurality of primary reflectors and light emitting diodes;

a third ring assembly mounted on the second ring assembly, the third ring having a third plurality of reflectors and light emitting diodes, the third ring assembly having a planar surface mounting a third diffuser positioned in relation to the third plurality of primary reflectors and light emitting diodes, the third diffuser mixing the light from the third plurality of primary reflectors and light emitting diodes; and

a fourth ring assembly mounted on the third ring assembly, the fourth ring assembly having a fourth plurality of reflectors and light emitting diodes, the fourth ring assembly having a planar surface mounting a fourth diffuser positioned in relation to the fourth plurality of primary reflectors and light emitting diodes, the fourth diffuser mixing the light from the fourth plurality of primary reflectors and light emitting diodes.

13. The light beacon of claim 12, wherein the first ring assembly includes a circular mounting device holding the first diffuser.

14. The light beacon of claim 12, wherein the mounting device has a circular beam blocking wall to prevent stray light from the light emitting diodes of the first ring assembly being emitted below a predetermined elevation angle.

15. The light beacon of claim 12, wherein the reflectors of the first and second ring are offset from each other.

16. The light beacon of claim 12, wherein the first ring assembly includes a plurality of circuit boards mounting the light emitting diodes and a heat sink coupled to the plurality of circuit boards.

17. The light beacon of claim 12, wherein the pluralities of primary reflectors each form a horizontal beam approximately 5 to 10 degrees wide.

18. The light beacon of claim 12, where the diffusers are used to reduce azimuth ripple from the light emitted by at least some of the plurality of light emitting diodes and reflectors.

19. The light beacon of claim 12, wherein the diffusers are a Fresnel lens spreading the beams from the light emitting diodes in a horizontal direction but not in a vertical direction.

20. The light beacon of claim 12, wherein the diffusers are a holographic plastic film having a diffusing pattern.