LED light fixture with a heat sink having concentrically segmented fins

Patent metadata

Field	Value
Publication number	US-11879629-B2
Application number	US-202217710354-A
Country	US
Kind code	B2
Filing date	Mar 31, 2022
Priority date	Mar 31, 2022
Publication date	Jan 23, 2024
Grant date	Jan 23, 2024

Abstract

An LED light fixture includes a heat dissipation structure defining a first housing member and a plurality of concentric fin sets. A circuit board is thermally coupled to a side of the first housing member opposite the concentric fin sets, a plurality of light emitters is thermally coupled and mounted to a region of the circuit board overlying a first set of concentric fins, and a driver circuit is coupled and mounted to a region of the circuit board overlying a second set of concentric fins. A reflector spans between the circuit board and a second housing member, and a lens spans between the first and second housing member and provides light transmission therethrough.

First claim

What is claimed is:

1. A light fixture, comprising:
a heat dissipation structure, the heat dissipation structure formed as a unitary structure and defining:
a first housing member defining first and second sides; and
a plurality of concentric fin sets extending from the first side of the first housing member, first and second sets of an adjacent concentric pair of the plurality of concentric fin sets defining a first open channel therebetween;

a plurality of light emitters thermally coupled to and more proximate to the first set of the plurality of concentric fin sets than the second set of the plurality of concentric fin sets, and the plurality of light emitters located on the second side of the first housing member; and
a driver circuit thermally coupled to and more proximate to the second set of the plurality of concentric fin sets than the first set of the plurality of concentric fin sets.

2. The light fixture of claim 1 , further comprising a reflector, and wherein the reflector forms a curvilinear annulus shape for redirecting light emissions from the plurality of light emitters.

3. The light fixture of claim 1 , wherein:
the second set of the plurality of concentric fin sets is located within the first set of the plurality of concentric fin sets; and
the first and second sets of the plurality of concentric fin sets extend equidistantly from the first side of the first housing member.

4. The light fixture of claim 1 , wherein the plurality of concentric fin sets includes a third set of the plurality of concentric fin sets, the third set located within the second set and defining:
a second open channel between the third set and the second set; and
a cavity defined within the third set of the plurality of concentric fins, the cavity formed to receive a sensor therein.

5. The light fixture of claim 1 , wherein a first portion of the first housing member overlying the first open channel defines a minimum thickness of the first housing member between the first side and the second side, thereby minimizing thermal transmission across the first portion of the first housing member.

6. The light fixture of claim 1 , wherein the plurality of light emitters forms a perimeter adjacent the second side of the first housing member.

7. The light fixture of claim 6 , wherein the perimeter is located around the driver circuit.

8. The light fixture of claim 6 , wherein the perimeter is circular.

9. The light fixture of claim 1 , wherein the heat dissipation structure further defines an opening adapted for receiving and mounting a sensor therein.

10. The light fixture of claim 9 , wherein the heat dissipation structure further forms a cylinder extending distally from the first side, and the opening is defined at a distal end of the cylinder.

11. The light fixture of claim 9 , wherein the opening is closed by a plug that is removeable for mounting the sensor therein.

12. The light fixture of claim 1 , wherein:
the driver circuit includes a circuit board thermally coupled to and adjoining the second side of the first housing member;
the plurality of light emitters is mounted to a first region of the circuit board overlying the first set of the plurality of concentric fin sets; and
the driver circuit is mounted to a second region of the circuit board overlying the second set of the plurality of concentric fin sets.

13. The light fixture of claim 12 , wherein the first housing member is contiguous between and across both the first region and the second region.

14. The light fixture of claim 12 , wherein the first housing member defines a flat plate spanning the circuit board.

15. The light fixture of claim 1 , further comprising a reflector located and formed to redirect light emission to a first direction perpendicular to the first side of the first housing member, away from a second direction perpendicular to the second side of the first housing member and beyond the first housing member.

16. The light fixture of claim 15 , wherein the reflector is further located and formed to redirect light emission to a direction perpendicular to the first and second directions.

17. The light fixture of claim 15 , further comprising a second housing member and wherein the reflector is located between the first housing member and the second housing member.

18. The light fixture of claim 17 , further comprising an optical member, and wherein the optical member spans between the first housing member and the second housing member and provides light emission therethrough.

19. A light fixture, comprising:
a heat dissipation structure defining:
a first housing member defining first and second sides; and
a plurality of concentric fin sets extending from the first side of the first housing member, first and second sets of an adjacent concentric pair of the plurality of concentric fin sets defining a first open channel therebetween;

a circuit board thermally coupled to and adjoining the second side of the first housing member;
a plurality of light emitters coupled to a first region of the circuit board overlying the first set of the plurality of concentric fin sets; and
a driver circuit thermally coupled and mounted to a second region of the circuit board overlying the second set of the plurality of concentric fin sets; and
wherein a first portion of the first housing member overlying the first open channel defines a minimum thickness of the first housing member between the first side and the second side, thereby minimizing thermal transmission across the first portion of the first housing member.

20. The light fixture of claim 19 , wherein:
the heat dissipation structure further forms a projection extending distally from the first side;
the projection defines an opening for receiving and mounting a sensor therein; and
the opening is defined at a distal end of the cylinder.

21. A light fixture, comprising:
a heat dissipation structure defining:
a first housing member defining first and second sides; and
a plurality of concentric fin sets extending from the first side of the first housing member;

a circuit board thermally coupled to and adjoining the second side of the first housing member;
a second housing member overlying and spaced apart from the second side of the first housing;
a reflector located between the circuit board and the second housing;
an optical member spanning between the first housing member and the second housing member and providing light emission therethrough; and
a plurality of light emitters thermally coupled and mounted to a first region of the circuit board overlying a first set of the plurality of concentric fin sets, the plurality of light emitters located between the reflector and the optical member.

22. The light fixture of claim 21 , further comprising a driver circuit thermally coupled and mounted to a second region of the circuit board overlying a second set of the plurality of concentric fin sets, and wherein the heat dissipation structure further defines a first open channel between the first and second sets of an adjacent concentric pair of the plurality of concentric fin sets and extending from the first side of the first housing member.

23. A light fixture, comprising:
a heat dissipation structure, the heat dissipation structure formed as a unitary structure and defining:
a first housing member defining first and second sides; and
a plurality of concentric fin sets extending from the first side of the first housing

Assignees

• Rab Lighting Inc

Inventors

• Calaceto Nicholas
• Wang-Munson Dan

Classifications

• F21V29/773 Primary

  the planes containing the fins or blades having the direction of the light emitting axis · CPC title

• F21V7/04

  Optical design · CPC title

• F21V29/508 Primary

  of electrical circuits · CPC title

• F21V29/75

  with fins or blades having different shapes, thicknesses or spacing · CPC title

• F21V29/503

  of light sources (cooling arrangements structurally associated with gas-discharge or vapour-discharge lamps H01J61/52; cooling arrangements structurally associated with electric incandescent lamps H01K1/58; cooling arrangements structurally associated with light-emitting diodes H10H20/858) · CPC title