LED wall wash light

• US 20090290344A1
• Filed: 05/23/2008
• Published: 11/26/2009
• Est. Priority Date: 05/23/2008
• Status: Active Grant

• Current Assignee: Display Products
• Original Assignee: Display Products
• Inventors: Guo, Xin, Sun, Yupin, Chiang, Lee, Wong, Eng K.
• Granted Patent: US 7,703,946 B2
• Time in Patent Office: Days
• US Class Current: 362/240
• CPC Class Codes: F21S 2/005 of modular construction
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• CPC Class Codes: F21V 15/013 the housing being an extrusion
• CPC Class Codes: F21V 23/02 the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
• CPC Class Codes: F21V 23/06 the elements being coupling devices , e.g. connectors
• 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: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

Embodiments of the present invention relate to an LED light fixture that linearly arranges a plurality of LEDs within a housing such that each LED has a respective collimator. The output from the collimators is directed to a diffuser that shapes the light provided by the fixture so that a desired viewing angle is achieved. More particularly, the LEDs are located on a first circuit board and the driver chips for the LEDs are located on a second circuit board which sandwich a heat sink.

Claims

1. A light fixture comprising:

a housing;

a plurality of LEDs connected to a first circuit board;

a respective collimator for each of the plurality of LEDs, the collimators configured to direct light from the LEDs towards a top of the housing; and

a diffuser between the collimators and the top of the housing configured to shape light exiting the housing.

2. The light fixture of claim 1, further comprising:

a plurality of driver chips for the LEDs connected to a second circuit board on a first side and additional electronic components connected to the second circuit board on a second side.

3. The light fixture of claim 2, further comprising:

a heat sink in communication with the first circuit board and the plurality of driver chips such that heat is transferred from the first circuit board to the heat sink and from the driver chips to the heat sink.

4. The light fixture of claim 1, further comprising:

a plurality of driver chips for the LEDs connected to a second circuit board; and

a heat sink sandwiched between the first circuit board and the second circuit board.

5. The light fixture of claim 1, wherein the housing includes a major axis and the LEDs are arranged generally linearly along this major axis.

6. The light fixture of claim 5, wherein a respective collimator is bonded to the circuit board so as to surround a respective LED.

7. The light fixture of claim 5, wherein the LEDs are arranged about one inch apart.

8. The light fixture of claim 5, wherein the LEDs are arranged about two inches apart.

9. The light fixture of claim 1, wherein the light fixture provide about 850 lumens per foot.

10. The light fixture of claim 1, further comprising:

a first electrical connector configured to be coupled with a power signal and the LEDs.

11. The light fixture of claim 10, wherein the first electrical connector is further configured to be coupled with a dimming control signal.

12. The light fixture of claim 11, further comprising:

a second electrical connector configured to supply as output the power signal and the dimming control signal.

13. The light fixture of claim 3, further comprising:

a structure within the housing configured to communicate with the heat sink such that heat is transferred from the heat sink to the housing.

14. The light fixture of claim 1, further comprising:

a shield configured to protect the diffuser and provide an outer top surface for the housing.

15. The light fixture of claim 14, wherein the outer top surface is a flush surface.

16. The light fixture of claim 14, wherein the housing and shield provide a water-tight enclosure.

17. A light fixture comprising:

a housing;

at least one light assembly within the housing comprising;

a plurality of LEDs connected to a first circuit board;

a respective collimator for each of the plurality of LEDs, the collimators configured to direct light from the LEDs towards a top of the housing;

a plurality of driver chips for the LEDs connected to a second circuit board; and

a heat sink sandwiched between the first circuit board and the second circuit board; and

a diffuser between the collimators and the top of the housing configured to shape light exiting the housing; and

a shield configured to protect the diffuser and provide an outer top surface for the housing.

18. The light fixture of claim 17, further comprising:

at least two light assemblies in electrical communication with one another.

19. The light fixture of claim 17, further comprising:

a structure within the housing configured to communicate with the heat sink such that heat is transferred from the heat sink to the housing.

20. The light fixture of claim 17, wherein power consumption is about 17 W for each light assembly and the light fixture provides about 850 lumens per foot.