Light Fixture with Central Lighting Housing and Peripheral Cooling Housing

• US 20130322079A1
• Filed: 06/03/2013
• Published: 12/05/2013
• Est. Priority Date: 06/01/2012
• Status: Active Grant

• Current Assignee: RAB Lighting Incorporated
• Original Assignee: RAB Lighting Incorporated
• Inventors: Guercio, Vincenzo, Hu, Jiang, Wang-Munson, Dan
• Granted Patent: US 8,985,816 B2
• Time in Patent Office: Days
• US Class Current: 362/249.01
• 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 29/507 of means for protecting lighting devices from damage, e.g. housings
• 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: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An illustrative light fixture includes a cylindrical lighting package housing surrounded peripherally by a cooling housing providing airflow cooling channels. The airflow cooling channels are defined in the space between the circumference of the cylindrical lighting package housing and a rim around the periphery of the light fixture. The cooling housing provides wide and long openings for air to rise vertically from below and through the airflow channels defined in part by cooling fins, and radial exit channels with vertical space for radially outward flow below a ceiling the fixture is mounted on, while also eliminating or minimizing the view through the airflow channels and to the ceiling.

Claims

1. A light fixture, comprising:

an light package housing including emitters;

an illumination side of the light package housing, the emitters projecting light from the illumination side;

a top side of the light package housing, located opposite the illumination side; and

a cooling housing extending peripherally around an outer circumference of the light package housing, the cooling housing including a plurality of cooling fins, a rim, and a radial ring fin support; and

wherein;

the rim couples the cooling fins around an outer circumference of the cooling housing;

the plurality of cooling fins span radially between the outer circumference of the light package housing; and

the radial ring fin support radially spans a portion of adjacent vertical fins between the rim and the outer circumference of the light package.

2. The light fixture of claim 1, wherein the radial ring fin support forms an annulus extending from the rim and inwardly toward the outer circumference of the light package housing such that a vertical cooling channel remains between the radial ring fin support, the outer circumference of the light package housing, and adjacent ones of the plurality of cooling fins.

3. The light fixture of claim 1, wherein the radial ring fin support spans a substantial portion of the vertical openings between the rim, the outer circumference of the light package housing, and adjacent ones of the plurality of cooling fins.

4. The light fixture of claim 1, wherein the bottom side of the radial ring fin support redirects radially inwardly at least a substantial portion of the vertical cooling channel path extending upwardly from a bottom side of the support and between adjacent ones of the plurality of cooling fins.

5. The light fixture of claim 1, wherein the top side of the light package housing includes a flat portion for mounting the light fixture to a ceiling.

6. The light fixture of claim 5, wherein the top side of the radial ring fin support, ceiling, and adjacent ones of the plurality of cooling fins form cooling paths extending radially outward from an upper portion of the outer circumference of the light package housing.

7. The light fixture of claim 1, wherein the light package housing is about cylindrical.

8. The light fixture of claim 1, wherein the light package housing further includes at least one emitter driver and the cooling housing surrounds the outer circumference of the portion of the light package housing containing the at least one emitter driver.

9. The light fixture of claim 1, wherein the cooling housing surrounds the outer circumference of the portion of the light package housing containing the emitters.

10. The light fixture of claim 1, wherein the rim spans vertically from the illumination side to the top side.

11. The light fixture of claim 1, wherein the plurality of cooling fins each include top edge adjacent the outer circumference of the lighting package housing that is about coplanar with the top surface of the lighting package housing.

12. A light fixture, comprising:

an light package housing including emitters;

an illumination side of the light package housing, the emitters projecting light from the illumination side;

a top side of the light package housing, located opposite the illumination side;

a cooling housing extending peripherally around an outer circumference of the light package housing, the cooling housing including a plurality of cooling fins, a rim, and a radial ring fin support; and

, a plurality of vertical cooling channels defined between the rim, outer circumference of the light package housing, and adjacent ones of the plurality of cooling fins; and

wherein;

the rim couples the cooling fins around an outer circumference of the cooling housing;

the plurality of cooling fins span radially between the outer circumference of the light package housing; and

the radial ring fin support radially spans a portion of adjacent vertical fins between the rim and the outer circumference of the light package, a bottom side of the radial ring fin support redirects radially inwardly, toward the light package housing, each of the plurality of vertical cooling channels.

13. The light fixture of claim 12, wherein the radial ring fin support forms an annulus extending from the rim and inwardly toward the outer circumference of the light package housing.

14. The light fixture of claim 12, wherein the radial ring fin support spans a substantial portion of the vertical openings between the rim, the outer circumference of the light package housing, and adjacent ones of the plurality of cooling fins.

15. The light fixture of claim 12, wherein the top side of the light package housing includes a flat portion for mounting the light fixture to a ceiling.

16. The light fixture of claim 15, wherein the top side of the radial ring fin support, ceiling, and adjacent ones of the plurality of cooling fins form cooling paths extending radially outward from an upper portion of the outer circumference of the light package housing.

17. The light fixture of claim 12, wherein the light package housing is about cylindrical.

18. The light fixture of claim 12, wherein the light package housing further includes at least one emitter driver and the cooling housing surrounds the outer circumference of the portion of the light package housing containing the at least one emitter driver.

19. The light fixture of claim 12, wherein the cooling housing surrounds the outer circumference of the portion of the light package housing containing the emitters.

20. A light fixture, comprising:

an light package housing including emitters;

an illumination side of the light package housing, the emitters projecting light from the illumination side;

a top side of the light package housing, located opposite the illumination side;

a cooling housing extending peripherally around an outer circumference of the light package housing, the cooling housing including a plurality of cooling fins, a rim, and a radial ring fin support; and

,

a plurality of vertical cooling channels defined between the rim, outer circumference of the light package housing, and adjacent ones of the plurality of cooling fins; and

wherein;

the rim couples the cooling fins around an outer circumference of the cooling housing;

the plurality of cooling fins span radially between the outer circumference of the light package housing; and

the radial ring fin support forms an annulus extending from the rim and inwardly toward, but not touching, the outer circumference of the light package housing, and a bottom side of the radial ring fin support redirects radially inwardly, toward the light package housing, each of the plurality of vertical cooling channels.