Light fixture with thermal management properties

Patent metadata

Field	Value
Publication number	US-9416954-B2
Application number	US-201313834319-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	May 7, 2012
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A light fixture including an electronic housing and at least one optical chamber positioned on each side of the electronic housing. In some embodiments, the optical chambers are positioned a distance from the electronic housing so as to avoid creation of a thermal path between the optical chambers and the electronic housing. Each optical chamber includes a heat sink and a plurality of LEDs mounted on a PCB that is, in turn, mounted on the heat sink. A reflector is positioned over at least a portion of the PCB. In some embodiments, vents extend through the heat sink and a fin extends upwardly from the heat sink and angles at least partially over at least some of the vents. In use, air enters the optical chambers and exits the fixture through the top vents in the heat sink. The air circulates over the reflector, carrying heat from the reflectors during the process. Heat is also conducted to the air from the heat sink. The angled fins extending over the top vents provide additional surface area for contact with the air and thus facilitate additional heat transfer from the heat sink.

First claim

I claim:

1. A light fixture comprising:
(a) an electronic housing; and
(b) a first and a second optical chamber, each comprising:
(i) a heat sink comprising:
at least one planar portion;
an outer side arm and an inner side arm, each extending downwardly at an angle from the at least one planar portion so as to define at least one trough having a trough opening, wherein the outer side arm terminates in an outer heat sink edge; and
a plurality of vents extending through the at least one heat sink, wherein at least one fin integrally-formed with the heat sink extends upwardly from the heat sink and angles at least partially over at least one of the plurality of vents;

(ii) at least one printed circuit board having a surface on which at least one light emitting diode is mounted, wherein the at least one printed circuit board is mounted on the at least one planar portion of the heat sink within the at least one trough; and
(iii) at least one reflector comprising at least one aperture, wherein the at least one reflector is positioned over at least a portion of the surface of the at least one printed circuit board so as to cover the portion of the surface and so that the at least one light emitting diode is positioned within the at least one aperture of the at least one reflector,

wherein the first and second optical chambers are positioned (A) exterior to, and on opposing sides of, the electronic housing such that the electronic housing is interposed between the first and second optical chambers and (B) a distance from the electronic housing such that an air gap is formed between the electronic housing and each of the first and second optical chambers.

2. The light fixture of claim 1 , wherein the electronic housing comprises a plurality of vents through which heat may dissipate from the electronic housing.

3. The light fixture of claim 1 , wherein the at least one reflector comprises a substantially flat top portion that is positioned over at least a portion of the surface of the at least one printed circuit board.

4. The light fixture of claim 3 , wherein the top portion of the at least one reflector comprises opposing sides and wherein the at least one reflector further comprises a side wall that extends downwardly at an angle from each opposing side of the top portion.

5. The light fixture of claim 4 , wherein the at least one reflector further comprises a ledge that extends outwardly from one of the side walls of the at least one reflector, wherein the ledge is positioned below and a distance from the outer heat sink edge of the heat sink so as to form an air gap between the ledge and the outer heat sink edge of the heat sink.

6. The light fixture of claim 1 , wherein the light fixture is adapted to permit air to enter the first and second optical chambers through the trough opening of each first and second optical chamber and exit the light fixture through the plurality of vents in the heat sink.

7. The light fixture of claim 1 , wherein the first and second optical chambers each further comprises a lens extending across at least a portion of the trough opening so as to at least partially enclose each of the first and second optical chambers.

8. The light fixture of claim 7 , wherein each of the first and second optical chambers further comprises a side door frame mounted on the outer heat sink edge of each of the first and second optical chambers.

9. The light fixture of claim 8 , wherein the side door frame comprises a ledge upon which the lens of each of the first and second optical chambers rests to support the lens on each of the first and second optical chambers.

10. The light fixture of claim 8 , wherein the side door frame comprises a plurality of vents extending along a length of the side door frame so as to permit air to enter each of the first and second optical chambers through the plurality of vents on the side door frame.

11. A light fixture comprising:
(a) an electronic housing; and
(b) a first and a second optical chamber, each comprising:
(i) a heat sink comprising:
at least one planar portion;
an outer side arm and an inner side arm, each extending downwardly at an angle from the at least one planar portion so as to define at least one trough having a trough opening, wherein the outer side arm terminates in an outer heat sink edge; and
a plurality of vents extending through the at least one heat sink, wherein at least one fin integrally-formed with the heat sink extends upwardly from the heat sink and angles at least partially over at least one of the plurality of vents;

(ii) at least one printed circuit board having a surface on which at least one light emitting diode is mounted, wherein the at least one printed circuit board is mounted on the at least one planar portion of the heat sink within the at least one trough;
(iii) at least one reflector comprising a substantially flat top portion having opposing sides, a plurality of apertures defined in the top portion, and a side wall extending downwardly at an angle from each opposing side of the top portion, wherein the top portion of the reflector is positioned over at least a portion of the surface of the at least one printed circuit board so as to cover the portion of the surface and so that the at least one light emitting diode is positioned within the at least one aperture of the at least one reflector; and
(iv) a lens extending across at least a portion of the trough opening so as to at least partially enclose each of the first and second optical chambers,

wherein the first and second optical chambers are positioned (A) exterior to, and on opposing sides of, the electronic housing such that the electronic housing is interposed between the first and second optical chambers and (B) a distance from the electronic housing such that an air gap is formed between the electronic housing and each of the first and second optical chambers.

12. The light fixture of claim 11 , wherein the at least one reflector further comprises a ledge that extends outwardly from one of the side walls of the at least one reflector, wherein the ledge is positioned below and a distance from the outer heat sink edge of the heat sink so as to form an air gap between the ledge and the outer heat sink edge of the heat sink.

13. The light fixture of claim 11 , each of the first and second optical chambers further comprises a side door frame mounted on the outer heat sink edge of each of the first and second optical chambers.

14. The light fixture of claim 13 , wherein the side door frame comprises a ledge upon which the lens of each of the first and second optical chambers rests to support the lens on each of the first and second optical chambers.

15. The light fixture of claim 13 , wherein the side door frame comprises a plurality of vents extending along a length of the side door frame so as to permit air to enter each of the first and second optical chambers through the plurality of vents on the side door frame.

Assignees

• Abl Ip Holding Llc

Inventors

• Miller Michael Ray

Classifications

• F21V29/83

  the elements having apertures, ducts or channels, e.g. heat radiation holes · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21S8/04

  intended only for mounting on a ceiling or the like overhead structures (F21S8/02 takes precedence; {details of ceiling bases F21V21/03}) · CPC title

• F21V29/773 Primary

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

• F21V13/04 Primary

  the elements being reflectors and refractors {(for vehicle rear lights F21S43/40)} · CPC title