RECESSED LED LIGHT FIXTURE WITHOUT SECONDARY HEAT SINK

• US 20150198324A1
• Filed: 01/10/2015
• Published: 07/16/2015
• Est. Priority Date: 01/10/2014
• Status: Active Grant

• Current Assignee: Cordelia Lighting Incorporated
• Original Assignee: Cordelia Lighting Incorporated
• Inventors: CHANG, SETH, NGUYEN, HUAN C., O'BRIEN, AARON
• Granted Patent: US 10,047,944 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F21K 9/20 Light sources comprising attachment means
• CPC Class Codes: F21S 8/026 intended to be recessed in a ceiling or like overhead structure, e.g. suspended ceiling
• CPC Class Codes: F21V 13/04 the elements being reflectors and refractors for vehicle rear lights F21S43/40
• CPC Class Codes: F21V 17/16 by deformation of parts; Snap action mounting
• CPC Class Codes: F21V 21/04 Recessed bases
• CPC Class Codes: F21V 23/009 the casing being inside the housing of the lighting device
• CPC Class Codes: F21V 23/0435 activated by remote control means
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21V 33/0052 Audio or video equipment, e.g. televisions, telephones, cameras or computers; Remote control devices therefor
• CPC Class Codes: F21V 7/04 Optical design
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/30 Driver circuits

Abstract

A recessed LED light fixture without need for a bulky, finned, metal heat sink. The recessed LED light fixture includes a Metal Core Printed Circuit Board (MCPCB) holding an array of LEDs that are arrange at the center thereof, and mounted to the printed circuit board using patterns of electrical and thermal conductors used to conduct a current and radiate heat. A mounting bracket holds the entire assembly for the light fixture together while spacing the LED driver and printed circuit board apart for further cooling, and wherein the upper side of the printed circuit board is exposed to the ambient air inside the housing.

Claims

1. An LED light fixture without a metal, finned heat sink for mounting to a building framework, comprising:

at least one LED;

a thermally conductive printed circuit board, wherein the at least one LED is mounted toward the center of the printed circuit board wherein the at least one LED is connected by paths of electrical and thermal conductor material, the printed circuit board having an annular surface area around the edge;

a reflector trim having an open top, wherein the printed circuit board is mounted to the open top and part of the annular surface area is at least one of coupled to and in close proximity to the reflector trim, wherein the reflector trim includes a material with a thermal conductivity of about 2 W/m-K to about 49 W/m-K, and includes a minimum reflectivity of 20%, the reflector trim having an annular flange around the open top to engage the printed circuit board at the annular surface area;

a LED driver for powering the at least one LED;

a mounting system spacing the LED driver away from the printed circuit board creating a gap therebetween; and

attachment means for mounting the light fixture to the building framework.

2. The LED light fixture of claim 1, wherein the printed circuit board is spaced at a minimum about 3 mm from the reflector trim.

3. The LED light fixture of claim 1, wherein the reflector trim includes an alternative low thermal conductivity material having a thermal conductivity of about 0.2 W/m-K.

4. The LED light fixture of claim 1, wherein the fixture includes a receiving/sending module mounted on the fixture for communication with a wireless control.

5. The LED light fixture of claim 4, wherein an antenna for the wireless control is mounted and connected to send and receive signals through the reflector trim.

6. The LED light fixture of claim 4, wherein the receiving/sending module sends and receives Near Field Communication signals.

7. The LED light fixture of claim 1, wherein the fixture includes a diffuser covering the packaged LED and the diffuser is spaced apart from the reflector trim.

8. The LED light fixture of claim 1, wherein the thermally conductive printed circuit board includes a Metal Core Printed Circuit Board (MCPCB) having a thermally conductive metallic core.

9. The LED light fixture of claim 1, large areas of electrical and thermal conductor material disposed on a surface of the printed circuit board.

10. An LED light fixture without a metal, finned heat sink, comprising:

at least one LED;

a thermally conductive Metal Core Printed Circuit Board (MCPCB) having a first diameter, wherein the at least one LED is mounted toward the center of the MCPCB, and wherein the at least one LED is connected by paths of electrical and thermal conductor material;

a reflector trim having an open top of a second diameter wherein the second diameter is smaller than the first diameter and an outer periphery of the MCPCB overhangs the reflector trim, and wherein the MCPCB is mounted to the open top so that the MCPCB is at least one of coupled to and in close proximity to the reflector trim;

a LED driver for powering the at least one LED;

a mounting system spacing the LED driver away from the MCPCB creating a gap therebetween; and

attachment means for mounting the light fixture.

11. The LED light fixture of claim 10, wherein the attachment means includes at least one of friction blades and V-torsion spring clips.

12. The LED light fixture of claim 10, wherein the reflector trim includes a cone shape, an open top, and an upper lip that engages the MCPCB.

13. The LED light fixture of claim 10, wherein the MCPCB has a circular shape with a first diameter, and the reflector trim has a circular top with a second diameter, and the first diameter is larger than the second diameter.

14. The LED light fixture of claim 10, wherein the at least one LED further comprises a plurality of LEDs clustered together at a center of the MCPCB without any LEDs at the outer periphery.

15. The LED light fixture of claim 10, wherein the MCPCB includes open surface areas covered by sections of an electrical and thermal conductor material.

16. An LED light fixture without a metal, finned heat sink, comprising:

A plurality of LEDs;

a thermally conductive Metal Core Printed Circuit Board (MCPCB) having a first outside diameter, wherein the plurality of LEDs are mounted toward the center of the MCPCB, and wherein the plurality of LEDs are connected by paths of electrical and thermal conductor material;

a reflector trim having an open top having a second outside diameter wherein the second outside diameter is smaller than the first outside diameter and an outer periphery of the MCPCB overhangs the reflector trim, and wherein the MCPCB is mounted to the open top;

a LED driver for powering the plurality of LEDs;

a diffuser covering the plurality of LEDs;

a mounting system spacing the LED driver away from the MCPCB creating a gap therebetween; and

attachment means for mounting the light fixture.

17. The LED light fixture of claim 16, wherein the diffuser is spaced apart from the MCPCB by a small gap.

18. The LED light fixture of claim 16, wherein the MCPCB include a thermally conductive metallic core.

19. The LED light fixture of claim 16, wherein the reflector trim includes a material with a thermal conductivity of about 2 W/m-K to about 49 W/m-K.