LED signal lamp

• US 7,237,924 B2
• Filed: 06/13/2003
• Issued: 07/03/2007
• Est. Priority Date: 06/13/2003
• Status: Active Grant

• Current Assignee: Current Lighting Solutions, LLC (f/k/a GE Lighting Solutions, LLC) (American Industrial Partners)
• Original Assignee: Lumination LLC
• Inventors: Dubuc, Eden, Martineau, Patrick
• Primary Examiner(s): Tso; Laura K.
• Application Number:
  US10/461,151
• Publication Number:
  US 20040252520A1
• Time in Patent Office: 1,481 Days
• Field of Search: 362/231, 362/240, 362/330, 362/331, 362/235, 362/247, 362/246, 362/800, 362/96, 362/309, 362332-333, 362335-340, 362545-547, 362/326, 362/244, 405/50, 359/159, 359/742
• US Class Current: 362/231
• CPC Class Codes: F21V 21/02 Wall, ceiling, or floor bases; Fixing pendants or arms to the bases F21V21/08 takes precedence; bases for movable standing lamps F21V21/06
• CPC Class Codes: F21V 21/06 Bases for movable standing lamps; Fixing standards to the bases F21V21/08 takes precedence
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 31/005 Sealing arrangements therefor
• CPC Class Codes: F21V 5/045 the lens having discontinuous faces, e.g. Fresnel lenses
• CPC Class Codes: F21W 2111/00 Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
• CPC Class Codes: F21W 2111/02 for roads, paths or the like
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED signal using a novel optical element to control the light distribution of a small LED light source. Light emitted by the LEDs illuminates the optical element. The optical element has a plurality of clusters, shaped along the x-, y- and z-axis to control the light. After the light is distributed, it encounters a second optical surface of the optical element, typically a fresnel surface. The light is controlled by the optical element.

Optionally, a lens can be placed over each LED to control the light pattern of the LED. The lens has an entry face to direct the light to a total internal reflection surface on the side, which redirects the light to the exit face. The resulting signal is a uniform, efficient signal.

Claims

1. An LED signal comprising:

at least one LED arranged on a metal core PCB, said at least one LED has a footprint;

a substantially planar optical element having a first surface facing toward the at least one LED and a second surface facing away from the at least one LED;

at least one lens placed over said at least one LED;

the at least one lens has an entry face, an exit face, and a side;

the side has an upper total internal reflection portion and a lower portion;

a carrier formed integrally with said at least one lens at the lower portion of said at least one lens wherein the lens controls light emitted from the LED at the entry face, the exit face and the upper total internal reflection surface; and

said optical element having an optical surface on the second surface and a diffusing surface on the first surface, wherein said diffusing surface comprises a plurality of clusters and said optical surface collimates LED light diffused by said diffusing surface.

2. The LED signal of claim 1, wherein said optical element controls the light that exits the second surface.

3. The LED signal of claim 1, wherein the optical surface is a fresnel lens.

4. The LED signal of claim 2, wherein each cluster has a continuous shaped surface that approximates a plurality of faces.

5. The LED signal of claim 4, wherein said plurality clusters are symmetrical about a vertical midline of the optical element.

6. The LED signal of claim 4, wherein at least one cluster is asymmetrical.

7. The LED signal of claim 4, wherein substantially all the clusters are asymmetrical.

8. The LED signal of claim 4, wherein substantially all the clusters are different.

9. The LED signal of claim 6, wherein said optical element is centered on a central axis of said LED signal and the footprint of the at least one LED is substantially aligned with the central axis.

10. The LED signal of claim 9, wherein the optical surface collimates the light.

11. The LED signal of claim 10, wherein the optical surface is a fresnel lens.

12. The LED signal of claim 1, wherein the entry face is curved and directs the light away from the lower portion.

13. The LED signal of claim 1, further comprising a plurality of LEDs wherein the means for adjusting the radiation pattern further comprises a plurality of lenses each lens placed over one LED, and the carrier is formed integrally with the plurality of lenses.

14. The LED signal of claim 1, wherein said signal further comprises a means to dissipate heat and said means to dissipate heat is selected from the group consisting of a heat sink, a heat diffuser, a heat exchanger, the PCB or a combination thereof.

15. The LED signal of claim 14, wherein said means to dissipate heat is a heat sink.

16. The LED signal of claim 15, wherein the heat sink is substantially larger than said metal core PCB.

17. The LED signal of claim 1, wherein the means to dissipate heat is the metal core PCB.

18. The LED signal of claim 1, wherein the LED signal further comprises a second diffusing surface arranged such that light transmitted by the optical element is incident upon the second diffusing surface.

19. An LED signal comprising:

at least one LED arranged on a metal core POB, said at least one LED has a footprint;

a substantially planar optical element having a first surface facing toward the at least one LED and a second surface facing away from the at least one LED;

said optical element having an optical surface on the second surface and a diffusing surface on the first surface, wherein said diffusing surface comprises a plurality clusters;

at least one lens placed over said at least one LED;

the at least one lens has an entry face, an exit face, and a side;

the side has an upper total internal reflection portion, and a lower portion;

a carrier formed integrally with said at least one lens at the lower portion of said at least one lens;

wherein the lens controls light emitted from the LED at the entry face, the exit face and the upper total internal reflection surface;

a housing comprising a cover and a base, said base having an interior area and an open end, and

said at least one LED is located within said interior area and said cover closes said open end.

20. The LED signal of claim 19, wherein said optical element controls the light that exits the second surface.

21. The LED signal of claim 20, wherein each cluster has a continuous shaped surface that approximates a plurality of faces.

22. The LED signal of claim 21, wherein said plurality clusters are symmetrical about a vertical midline of the optical element.

23. The LED signal of claim 21, wherein at least one cluster is asymmetrical.

24. The LED signal of claim 21, wherein substantially all the clusters are asymmetrical.

25. The LED signal of claim 21, wherein substantially all the clusters are different.

26. The LED signal of claim 23, wherein said optical element is centered on a central axis of said LED signal and the footprint of the at least one LED is substantially aligned with the central axis.

27. The LED signal of claim 19, wherein the entry face is curved and directs the light away from the lower portion.

28. The LED signal of claim 19, further comprising a plurality of LEDs wherein the means for adjusting the radiation pattern further comprises a plurality of lenses each lens placed over one LED, and the carrier is formed integrally with the plurality of lenses.

29. The LED signal of claim 19, wherein said signal further comprises a means to dissipate heat and said means to dissipate heat is selected from the group consisting of a heat sink, a heat diffuser, a heat exchanger, the PCB or a combination thereof.

30. The LED signal of claim 29, wherein said means to dissipate heat is a heat sink.

31. The LED signal of claim 30, wherein the heat sink is substantially larger than said metal core PCB.

32. The LED signal of claim 29, wherein the means to dissipate heat is the metal core PCB.

33. The LED signal of claim 19, wherein said LED signal further comprises power supply components and circuitry.

34. The LED signal of claim 19, wherein said LED signal is adapted to be retrofit into an existing traffic light.

35. The LED signal of claim 19, wherein said cover attaches to said open end by a means for attachment.

36. The LED signal of claim 35, further comprising a sealing means to environmentally seal LED signal.

37. The LED signal of claim 36, wherein said sealing means is an O-ring.

38. The LED signal of claim 19, wherein the LED signal further comprises a second diffusing surface arranged such that light transmitted by the optical element is incident upon the second diffusing surface.

39. The LED signal of claim 38, wherein the second diffusing surface is the cover.

40. The LED signal of claim 19, wherein the cover is a neutral cover.

41. The LED signal of claim 19, wherein the cover is textured.

42. The LED signal of claim 19, wherein the cover is tinted.

43. The LED signal of claim 19, wherein the cover is clear.