LED area light fixture

• US 8,403,528 B2
• Filed: 02/24/2011
• Issued: 03/26/2013
• Est. Priority Date: 02/24/2011
• Status: Expired due to Fees

• Current Assignee: Douglas Garfield Bacon
• Original Assignee: Douglas Garfield Bacon
• Inventors: Bacon, Douglas Garfield
• Primary Examiner(s): Mai, Anh
• Assistant Examiner(s): Breval, Elmito
• Application Number:
  US12/932,322
• Publication Number:
  US 20120218751A1
• Time in Patent Office: 761 Days
• Field of Search: 362/241, 362/237, 362/335, 362/249.02, 362/218, 362/153.1, 362/268, 362/236, 362/249.01
• US Class Current: 362/241
• CPC Class Codes: F21S 8/086 with lighting device attached sideways of the standard, e.g. for roads and highways
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/85 characterised by the material liquid coolants F21V29/56
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21W 2131/103 of streets or roads
• CPC Class Codes: F21Y 2107/10 on concave supports or substrates, e.g. on the inner side of bowl-shaped supports
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED area light fixture for street, roadway or large area illumination including upper and lower, elongated, substantially semi-cylindrical, metallic shells spaced from and attached to each other wherein the upper shell is configured from a plurality of elongated, rectangular, angled strips with a plurality of elongated, rectangular PCB strips attached thereto and a plurality of linearly spaced high intensity LEDs embedded in each of the PCB strips and wherein the lower shell has a plurality of openings therein. A plurality of light diffusing lenses and light focusing cones are positioned in alignment with and between the LEDs and openings in the lower shell for providing uniform illumination below the LED light fixture. A heat conductive means is made integral with the PCB strips and the metallic upper shell in order to dissipate the heat generated by the high intensity LEDs during operation of the LED area light fixture.

Claims

1. An LED area light fixture comprising a first part and a second part wherein said first part has an elongated, metallic, substantially, semi-cylindrical upper shell and an elongated, metallic, substantially, semi-cylindrical lower shell spaced from said upper shell and wherein said second part is a housing attached to said first part, said upper and lower shells being enclosed and attached at opposite ends by end caps, a printed circuit board (PCB) secured to the underside of said upper shell and supporting an array of spaced, high intensity LEDs, said lower shell having a plurality of spaced openings therein wherein each of said plurality of spaced openings is aligned with a respective one of said LEDs, said lower shell having a counter-sunk hole on its inner side at each of said spaced openings, a light diffusing lens within each of said counter-sunk holes, an elongated, substantially semi-cylindrical, inner shell having a plurality of spaced openings therein with a hollow shaped, light focusing cone secured to said inner shell at each of said spaced openings, each of said hollow shaped, light focusing cones being aligned with a respective opening in said semi-cylindrical lower shell and with a respective high intensity LED in said semi-cylindrical upper shell, each of said hollow shaped, light focusing cones having one end with a smaller opening therein which smaller opening encompasses a respective LED in said array and an opposite end with a larger opening therein which opposite end is secured to said inner shell at a respective opening in said inner shell, a heat dissipative conductive layer being integral with said printed circuit board (PCB) and said array of high intensity LEDs, said second part enclosing electronic circuitry for operating and controlling said LEDs, and said second part including means for supporting said light fixture.

2. The light fixture of claim 1 wherein said upper shell is configured into a plurality of elongated, rectangular sections, said printed circuit board (PCB) being divided into a plurality of spaced, elongated, rectangular strips with a predetermined number of said spaced high intensity LEDs attached to each of said PCB strips, and each of said elongated PCB strips being attached to an inner surface of a respective elongated, rectangular section of said upper shell.

3. The light fixture of claim 2 wherein a predetermined number of said plurality of elongated, rectangular sections in said upper shell are progressively angled with respect to each other, wherein each of said predetermined number of said elongated, rectangular, angled sections has an elongated rectangular groove therein and wherein each of said PCB strips is inserted and fixed within a respective elongated rectangular groove.

4. The light fixture of claim 3 wherein said upper shell has five elongated, rectangular angled sections on one longitudinal side thereof and five elongated, rectangular, angled sections on the opposite longitudinal side thereof.

5. The light fixture of claim 4 wherein said lower shell has a plurality of elongated, rectangular sections, wherein a predetermined number of said plurality of elongated, rectangular sections in said lower shell are progressively angled with respect to each other and wherein each of said predetermined number of said plurality of elongated, rectangular angled sections of said lower shell corresponds with a respective elongated, rectangular, angled section in said upper shell.

6. The light fixture of claim 5 wherein each of said predetermined high intensity LEDs in said plurality of PCB strips is aligned with a respective opening in said hollow shaped cones which, in turn, is aligned with a respective opening in said lower shell.

7. The light fixture of claim 6 wherein said inner shell and said light focusing cones are integrally molded in one piece.

8. The light fixture of claim 7 wherein each of said light diffusing lenses is made from glass or plexiglass.

9. The light fixture of claim 8 wherein each of said light diffusing lenses is pressed into and hermetically sealed in a respective counter-sunk hole in said lower shell.

10. The light fixture of claim 9 wherein each of said light focusing cones is molded out of zinc plated plastic or other appropriate materials such as aluminum.

11. The light fixture of claim 9 wherein each of said light focusing cones and said inner shell are made from aluminum or other materials such as zinc coated plastic.

12. The light fixture of claim 11 wherein each of said LEDs in said array has a domed shaped lens and said smaller opening in each of said hollow shaped cones encompasses and contacts a respective domed shaped lens.

13. The light fixture of claim 12 wherein said opposite end of each of said hollow shaped cones is in contact with a respective light diffusing lens within a respective counter-sunk hole in said lower shell.

14. The light fixture of claim 13 wherein said lower shell, said upper shell, and said end caps are made from aluminum.

15. The light fixture of claim 14 wherein there is a thin copper layer between each of said PCB strips and said upper shell.

16. The light fixture of claim 15 wherein each of said high intensity LEDs has a light output ranging from 90 or more lumens.

17. The light fixture of claim 16 wherein there are ten elongated, rectangular, angled sections in each of said upper, lower and inner shells.

18. The light fixture of claim 17 wherein said upper shell is coated externally with an epoxy powder mixed with fine sand.

19. The light fixture of claim 1 wherein said second part is secured to said first part by an interconnecting structure so as to raise said first part at an acute angle with respect to said second part.

20. The light fixture of claim 19 wherein said acute angle is between approximately zero to 30 degrees.

21. The light fixture of claim 1 wherein said light fixture is for a street light mounted on a support pole.

22. An LED area light fixture comprising an optical module and an electrical/support housing interconnected by an angled structure, said optical module including elongated, substantially semi-cylindrical, upper and lower metallic shells, said upper and lower shells being spaced from each other, an elongated, semi-cylindrical inner shell spaced from said upper shell and secured between said upper and lower shells, said lower shell having a plurality of spaced openings therein, said inner shell having a plurality of spaced openings therein and in alignment with a respective opening in said lower shell, a plurality of light focusing cones attached to the upper surface of said inner shell, each of said light focusing cones having a through-hole therein and in alignment with a respective opening in said inner shell, each of said semi-cylindrical shells being mainly constructed of adjacent, elongated, angled sections on opposite sides of each shell, a plurality of elongated PCB strips, each of said plurality of elongated PCB strips having a plurality of linearly spaced LEDs attached thereto and facing said inner and lower shells, each of said elongated PCB strips being attached to a respective lower surface of each of said adjacent, elongated, angled sections of said upper shell, and each of said plurality of linearly spaced LEDs being in alignment with a respective opening in said inner shell and said lower shell.

23. The light fixture of claim 22 wherein said lower shell has a counter-bore on its upper side at each of said openings therein and a light diffusing lens in each of said counter-bores.

24. The light fixture of claim 23 wherein the larger end of each of said light focusing cones is in contact with a respective light diffusing lens and the smaller end of each of said light focusing cones encompasses a respective LED.

25. The light fixture of claim 24 wherein said angled structure raises said optical module at an acute angle with respect to said electrical/support housing.

26. The light fixture of claim 25 wherein said acute angle is between approximately zero and 30 degrees.

27. The light fixture of claim 26 wherein said light fixture is for area lighting such as a street light mounted on a support pole.

28. An LED street light fixture comprising an optical module and an electrical/support housing interconnected by a structure, said optical module including an elongated, substantially semi-cylindrical, upper metallic shell and an elongated, substantially semi-cylindrical, lower metallic shell spaced from said upper shell, an elongated, substantially semi-cylindrical inner shell spaced and supported between said upper and lower shells, said lower shell having a plurality of spaced openings therein, said inner shell having a plurality of spaced openings therein and in alignment with a respective opening in said lower shell, said inner shell having a plurality of light focusing cones secured thereto, each of said plurality of light focusing cones having a through-hole therein and being aligned with a respective opening in said inner shell, said lower shell having a counter-bore on its upper side at each of said plurality of spaced openings, a light diffusing lens in each of said counter-bores, each of said substantially semi-cylindrical upper, lower and inner shell being primarily constructed of adjacent, elongated, substantially rectangular, angled sections on opposite sides of each shell, a plurality of elongated PCB strips, each of said plurality of elongated PCB strips having a plurality of linearly spaced LEDs attached thereto and facing said inner and lower shells, each of said plurality of elongated PCB strips being attached to a lower surface of a respective angled section of said upper shell, and each of said linearly spaced LEDs being in alignment with a respective opening in said inner shell.

29. The LED street light fixture of claim 28 wherein the inner surface of each of said elongated, angled sections in said upper shell has an elongated groove therein and each of said plurality of elongated PCB strips is secured in a respective elongated groove.

30. The LED street light fixture of claim 29 wherein there is thin, heat conductive, metallic layer between each of said plurality of elongated PCB strips and said upper shell.

31. The LED street light fixture of claim 30 wherein said heat conductive, metallic layer is made of copper or other equivalent heat dissipating materials.

32. The LED street light fixture of claim 31 wherein said inner shell and light diffusing cones are metallic.

33. The LED street light fixture of claim 31 wherein said inner shell and said light diffusing cones are made of zinc plated plastic.

34. The LED street light fixture of claim 33 wherein said upper shell is coated externally with an epoxy powder mixed with sand.

35. The LED street light fixture of claim 28 wherein said electrical/support housing is secured to said optical module by said interconnecting structure so as to raise said optical module at an acute angle with respect to said electrical/support housing.

36. The LED street light fixture of claim 28 wherein an electrical control unit is supported within said electrical/support housing for operating said LEDs and wherein a pole support structure is secured within said electrical/support housing.

37. The LED street light fixture of claim 36 wherein said LEDs in said optical module are connected to said electrical control unit in said housing by electrical harnesses.

38. The LED street light fixture of claim 28 wherein said upper and lower shells are secured and sealed together by end caps.