LED-based lighting system and method

• US 7,887,216 B2
• Filed: 03/10/2008
• Issued: 02/15/2011
• Est. Priority Date: 03/10/2008
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Cooper Technologies Company (Eaton Corporation PLC.)
• Inventors: Patrick, Ellis W.
• Primary Examiner(s): O Shea; Sandra L
• Assistant Examiner(s): Dunwiddie; Meghan K
• Application Number:
  US12/075,184
• Publication Number:
  US 20090225549A1
• Time in Patent Office: 1,072 Days
• Field of Search: 36221701-21702, 362218-219, 362/223, 362/249.02, 362/294, 362/373, 362/555
• US Class Current: 362/218
• CPC Class Codes: F21S 8/04 intended only for mounting on a ceiling or the like overhead structures F21S8/02 takes precedence; details of ceiling bases F21V21/03
• CPC Class Codes: F21V 29/505 of reflectors
• CPC Class Codes: F21V 29/77 with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A lighting system comprises a row of light emitting diodes (“LEDs”) receiving electricity and producing light and heat. The row of LEDs can be located in a channel or a groove of a piece of material, such as an aluminum extrusion or a bent piece of metal. The channel can have an optically reflective lining, for example, providing either diffuse or specular reflection. Accordingly, the channel can reflect light emitted by the LEDs. The piece of material can also include a heat sink for transferring heat from the LEDs to air via convection or air flow. The heat sink can comprise fins or protrusions that facilitate convection.

Claims

1. A lighting system, comprising:

a member that comprises;

a concave channel comprising an optically reflective metallic surface that lines the channel; and

a plurality of protrusions disposed outside of the channel and running alongside the channel;

a row of light emitting diodes disposed in the channel, attached to at least one substrate contacting the metallic surface, and oriented to emit light onto the optically reflective surface, wherein the optically reflective surface is operative to reflect the emitted light outside the lighting system to create an illumination pattern outside the lighting system; and

wherein the plurality of protrusions are operative to dissipate heat produced by the row of light emitting diodes.

2. The lighting system of claim 1, further comprising a heat conductive path, consisting of one or more solid materials, operative to conduct heat from the row of light emitting diodes to the plurality of protrusions, and wherein the plurality of protrusions are operative to dissipate the conducted heat via convection.

3. The lighting system of claim 1, wherein each light emitting diode in the row of light emitting diodes is mounted on a respective substrate that is in thermal contact with the member.

4. The lighting system of claim 1, wherein the channel extends around a periphery of a luminaire,

wherein the row of light emitting diodes extends around the periphery of the luminaire,

wherein the member further comprises a groove running between two protrusions in the plurality of protrusions,

wherein the lighting system further comprises a second member that comprises:

a second channel comprising a second optically reflective surface; and

a second plurality of protrusions running alongside the second channel, and

wherein a protrusion in the second plurality of protrusions is seated in the groove.

5. The lighting system of claim 1, wherein the channel extends to form a rectangle, and wherein the plurality of protrusions running alongside the channel are disposed behind the channel.

6. The lighting system of claim 1, further comprising:

a second channel adjacent the channel; and

a second row of light emitting diodes disposed in the second channel.

7. A lighting system, comprising:

a first light source disposed in a first cavity;

a first member comprising;

a concave, optically reflective first surface forming the first cavity;

a second surface, opposite the concave, optically reflective first surface, comprising a plurality of first protrusions operative to dissipate heat produced by the first light source; and

a slot disposed adjacent the first protrusions;

a second light source disposed in a second cavity extending alongside the first cavity; and

a second member extending alongside the first member and comprising;

a concave, optically reflective second surface forming the second cavity; and

a third surface, opposite the concave, optically reflective second surface, comprising a plurality of second protrusions,

wherein the slot captures one of the second protrusions.

8. The lighting system of claim 7, wherein the first light source comprises a light emitting diode mounted on a substrate that is in contact with the first member,

wherein the second surface comprises a heat sink, and

wherein the plurality of first protrusions comprises a plurality of fins.

9. The lighting system of claim 7, wherein the first member, the plurality of first protrusions, and the first cavity extend lengthwise along a common axis.

10. The lighting system of claim 9, wherein the first light source comprises a plurality of light emitting diodes respectively attached to the first member and disposed along the common axis.

11. The lighting system of claim 7, wherein the first member and the first cavity extend around a periphery of a lighting fixture, and wherein the first light source comprises a plurality of light emitting diodes respectively disposed at regular intervals around the periphery.

12. The lighting system of claim 11, wherein the periphery forms a square or a rectangle.

13. The lighting system of claim 7, wherein the captured one of the second protrusions and the slot are keyed to one another.

14. The lighting system of claim 7, wherein the optically reflective first surface comprises a metallic surface.

15. The lighting system of claim 7, wherein the first light source comprises a light emitting diode mounted to a thermally conductive substrate that adjoins the first member.

16. A luminaire, comprising:

a first member comprising;

a first channel providing a first surface that is reflective to visible light emitted from one or more first lighting elements disposed in the first channel;

a plurality of first fins, disposed outside the first channel and extending generally parallel to the first channel, that are operative to convect heat from the first member to air; and

a slot extending generally parallel to the first channel; and

a second member comprising;

a second channel providing a second surface that is reflective to visible light emitted from one or more second lighting elements disposed in the second channel;

a plurality of second fins, disposed outside the second channel and extending generally parallel to the second channel, that are operative to convect heat from the second member to air; and

a protrusion extending generally parallel to the second channel,

wherein the protrusion is disposed in the slot.

17. The luminaire of claim 16, wherein the protrusion and the slot are mated to one another.

18. The luminaire of claim 16, wherein the slot captures the protrusion, and

wherein the slot and the protrusion cooperate to provide alignment between the first member and the second member.

19. An optical system, comprising

a first body of material that comprises:

a first finned surface operative to dissipate heat produced in response to converting electricity into first light;

a first concave surface operative to reflect the first light; and

a slot running along the first finned surface; and

a second body of material that is disposed adjacent the first body of material and that comprises;

a second finned surface operative to dissipate heat produced in response to converting electricity into second light;

a second concave surface operative to reflect the second light; and

a protrusion running along the second finned surface,

wherein the protrusion and the slot are keyed to one another.

20. The optical system of claim 19, wherein the first body of material comprises metal coated with an optically reflective material.

21. The optical system of claim 19, wherein the first concave surface and fins of the first finned surface extend lengthwise essentially parallel to one another.

22. The optical system of claim 19, wherein the first concave surface extends around a luminaire, and wherein the optical system further comprises a light emitting diode that is operative to produce the heat as a byproduct of converting the electricity into the first light.

23. An illumination system, comprising:

a body of material that comprises;

a first surface contour that reflects light;

a second surface contour that transfers heat to air via convection;

a slot running adjacent the second surface contour;

a protrusion running adjacent the second surface contour; and

a light emitting diode, mounted to the body of material and disposed adjacent the first surface contour, operative to convert electrical energy into the light and the heat,

wherein the slot of the body of material is keyed to a protrusion of a second body of material having a second light emitting diode attached thereto, and

wherein the protrusion of the body of material is keyed to a slot of a third body of material having a third light emitting diode attached thereto.

24. The illumination system of claim 23, further comprising:

an optical coating on the first surface contour for enhancing light reflection; and

a thermal path, consisting of one or more solid heat-conducting materials, extending from the light emitting diode to the second surface contour.

25. An illumination system, comprising:

a plurality of extrusions extending alongside one another, each comprising;

a slot extending lengthwise;

a protrusion extending lengthwise;

a concave channel extending lengthwise between the slot and the protrusion and lined with a reflective surface; and

a plurality of heat dissipating fins extending lengthwise opposite the concave channel; and

a plurality of rows of light emitting diodes, each row disposed in a respective one of the concave channels,

wherein the slot of one extrusion captures the protrusion of another extrusion.

26. The illumination system of claim 25, wherein slots and protrusions are keyed to one another.

27. The illumination system of claim 25, wherein the protrusion of the another extrusion is slidably disposed in the slot of the one extrusion.

28. A lighting system, comprising:

a member that comprises;

a channel comprising an optically reflective surface; and

a plurality of protrusions running alongside the channel;

a row of light emitting diodes disposed in the channel and oriented to emit light onto the optically reflective surface;

a heat conductive path, consisting of one or more solid materials, operative to conduct heat from the row of light emitting diodes to the plurality of protrusions;

wherein the optically reflective surface is operative to reflect the emitted light outside the lighting system to create an illumination pattern outside the lighting system; and

wherein the plurality of protrusions are operative to dissipate the conducted heat via convection.

29. A lighting system, comprising:

a member that comprises;

a channel comprising an optically reflective surface; and

a plurality of protrusions running alongside the channel; and

a row of light emitting diodes disposed in the channel and oriented to emit light onto the optically reflective surface;

wherein each light emitting diode in the row of light emitting diodes is mounted on a respective substrate that is in thermal contact with the member; and

wherein the optically reflective surface is operative to reflect the emitted light outside the lighting system to create an illumination pattern outside the lighting system.

30. A lighting system, comprising:

a first member comprising;

a first channel extending around a periphery of a luminaire and comprising a first optically reflective surface;

a first plurality of protrusions running alongside the channel; and

a groove running between two protrusions in the first plurality of protrusions;

a second member comprising;

a second channel comprising a second optically reflective surface; and

a second plurality of protrusions running alongside the second channel,

wherein a protrusion in the second plurality of protrusions is seated in the groove;

a row of light emitting diodes disposed in the first channel and extending around the periphery of the luminaire, the row of light emitting diodes oriented to emit light onto the first optically reflective surface;

wherein the first optically reflective surface is operative to reflect the emitted light outside the lighting system to create an illumination pattern outside the lighting system.

31. A lighting system, comprising:

a member that comprises;

a channel extending to form a rectangle and comprising an optically reflective surface; and

a plurality of protrusions running alongside the channel and disposed behind the channel; and

a row of light emitting diodes disposed in the channel and oriented to emit light onto the optically reflective surface;

wherein the optically reflective surface is operative to reflect the emitted light outside the lighting system to create an illumination pattern outside the lighting system.

32. A lighting system, comprising:

a member that comprises;

a first channel comprising an optically reflective surface; and

a plurality of protrusions running alongside the channel;

a first row of light emitting diodes disposed in the first channel and oriented to emit light onto the optically reflective surface;

a second channel adjacent the first channel; and

a second row of light emitting diodes disposed in the second channel;

wherein the optically reflective surface is operative to reflect the emitted light outside the lighting system to create an illumination pattern outside the lighting system.