LIGHT FIXTURE WITH AIRFLOW PASSAGE SEPARATING DRIVER AND EMITTER

• US 20130242574A1
• Filed: 09/12/2012
• Published: 09/19/2013
• Est. Priority Date: 09/12/2011
• Status: Active Grant

• Current Assignee: RAB Lighting Incorporated
• Original Assignee: RAB Lighting Incorporated
• Inventors: Guercio, Vincenzo, Gao, Wengang, Hu, Jiang
• Granted Patent: US 9,273,863 B2
• Time in Patent Office: Days
• US Class Current: 362/373
• CPC Class Codes: F21V 23/008 the casing being outside the housing of the lighting device
• CPC Class Codes: F21V 29/15 Thermal insulation
• CPC Class Codes: F21V 29/507 of means for protecting lighting devices from damage, e.g. housings
• CPC Class Codes: F21V 29/713 in direct thermal and mechanical contact of each other to form a single system
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/76 with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes

Abstract

An illustrative light fixture provides an emitter housing and a driver housing in a single fixture with an airflow channel defined between the emitter and driver housings. The airflow channel minimizes thermal conduction between the emitter and driver housings, and maximizes thermal convective cooling for at least one of the emitter housing and driver housing. The emitter housing includes vertical fins extending into the airflow chamber. The left and right sides of the emitter and driver housings define top and bottom edges that are respectively coplanar with the top and bottom edges of the vertical fins.

Claims

1. A light fixture for a light source having an emitter and driver, comprising:

an emitter housing defining an emitter mount, the emitter coupled to the emitter mount, the emitter housing defining a rear surface, a left side, and a right side, and wherein each of the left and right side define a top edge and a bottom edge;

a driver housing, the driver coupled to the driver housing, the driver housing defining a front surface, a left side, and a right side, and wherein each of the left and right side defining a top edge and a bottom edge;

an airflow passage defined by a space between the rear surface of the emitter housing and the front surface of the driver housing; and

a first plurality of fins located in the airflow passage and defining vertical oriented airflow channels, the vertical oriented airflow channels opening to a top side and a bottom side of the fixture, top and bottom edges defined by each of the first plurality of fins;

and wherein the top edges of the first plurality of fins are coplanar with the top edges of the left side and the right side of the emitter housing.

2. The light fixture of claim 1, wherein:

at least a portion of each of the first plurality of fins span the space between the emitter housing and the driver housing; and

the top edges of the first plurality of fins are coplanar with the top edges of the left side and the right side of the driver housing.

3. The light fixture of claim 1, wherein the plane defined by the top edges of the first plurality of fins and the top edges of the left and right sides of the driver housing and the emitter housing is curvilinear in a direction from a front of the emitter housing to a back of the driver housing.

4. The light fixture of claim 1, wherein the bottom edges of the first plurality of fins are coplanar with the bottom edges of the left side and the right side of each of the driver housing and the emitter housing

5. The light fixture of claim 1, wherein the rear surface of the emitter housing defines the first plurality of fins on a side opposite the emitter, the first plurality of fins in thermal conductivity with the emitter mount.

6. The light fixture of claim 1, wherein:

the left sides of the emitter and driver housings are coplanar; and

the right sides of the emitter and driver housings are coplanar.

7. The light fixture of claim 1, wherein:

the left sides of the emitter and driver housings enclose a left end of the airflow passage; and

the right sides of the emitter and driver housings enclose a right end of the airflow passage.

8. The light fixture of claim 1, wherein:

the left sides of the emitter and driver housings define a left side opening of the airflow passage, the left side opening spanning from the top edges of the left sides to the bottom edges of the left sides; and

the right sides of the emitter and driver housings define a right side opening of the airflow passage, the right side opening spanning from the top edges of the right sides to the bottom edges of the right sides.

9. The light fixture of claim 8, wherein the first plurality of fins are scalloped inward toward the emitter housing along their vertical length, the fins and the driver housing defining an open space that extends horizontally between the left side opening and right side opening of the fixture.

10. The light fixture of claim 1, wherein the first plurality of fins are evenly spaced.

11. The light fixture of claim 1, further comprising at least one fastener securing the emitter housing to the driver housing, and wherein the at least one fastener is fully enclosed by the emitter housing and the driver housing.

12. The light fixture of claim 1, further comprising a second plurality of fins defined by the driver housing.

13. The light fixture of claim 12, wherein each of the first plurality of fins is aligned with one of the second plurality of fins.

14. The light fixture of claim 11, wherein the top edges of the second plurality of fins are coplanar with the top edges of the first plurality of fins.

15. The light fixture of claim 1, further comprising a top surface defined by the emitter housing, and wherein the top edges of the first plurality of fins are coplanar with the top surface of the emitter housing.

16. The light fixture of claim 1, further comprising a top surface defined by the driver housing, and wherein the top edges of the first plurality of fins are coplanar with the top surface of the driver housing.

17. The light fixture of claim 1, wherein at least one of the rear surface of the emitter housing and the front surface of the driver housing is non-planar and projects into the airflow passage.

18. A light fixture for a light source having an emitter and driver, comprising:

an emitter housing defining an emitter mount, the emitter coupled to the emitter mount, the emitter housing defining a rear surface, a left side, a right side, and a top surface;

a driver housing, the driver coupled to the driver housing, the driver housing defining a front surface, a left side, and a right side;

an airflow passage defined by a space between the rear surface of the emitter housing and the front surface of the driver housing; and

a first plurality of fins located in the airflow passage and defining vertical oriented airflow channels, the vertical oriented airflow channels opening to a top side and a bottom side of the fixture, top and bottom edges defined by each of the first plurality of fins;

and wherein the top edges of the first plurality of fins are coplanar with the top surface of the emitter housing.

19. The light fixture of claim 18, further comprising a second plurality of fins defined by the driver housing, and each of the second plurality of fins are aligned with one of the first plurality of fins.

20. The light fixture of claim 18, wherein:

at least a portion of each of the first plurality of fins span the space between the emitter housing and the driver housing; and

the driver housing further defines a top surface and wherein the top edges of the first plurality of fins are coplanar with the top surface of the driver housing.