High flux LED lighting device

• US 7,111,961 B2
• Filed: 10/28/2003
• Issued: 09/26/2006
• Est. Priority Date: 11/19/2002
• Status: Expired due to Fees

• Current Assignee: Automatic Power, Inc. (Pharos Marine Automatic Power, Inc.)
• Original Assignee: Automatic Power, Inc. (Pharos Marine Automatic Power, Inc.)
• Inventors: Trojanowski, Alan, Trenchard, Stephen E.
• Primary Examiner(s): Sember, Thomas M.
• Assistant Examiner(s): HAN, JASON
• Application Number:
  US10/695,191
• Publication Number:
  US 20040095777A1
• Time in Patent Office: 1,064 Days
• Field of Search: 362/235, 362/249, 362/294, 362/311, 362/477, 362/540, 362/331, 362/545
• US Class Current: 362/235
• CPC Class Codes: B63B 45/04 the devices being intended to indicate the vessel or parts thereof
• CPC Class Codes: B63B 51/00 Marking of navigation route
• CPC Class Codes: F21S 8/00 Lighting devices intended for fixed installation F21S9/00, F21S10/00 take precedence; using a string or strip of light sources F21S4/00
• CPC Class Codes: F21S 9/035 the solar unit being integrated within the support for the lighting unit, e.g. within or on a pole
• CPC Class Codes: F21V 17/107 using hinge joints
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21V 31/04 Provision of filling media
• CPC Class Codes: F21V 5/045 the lens having discontinuous faces, e.g. Fresnel lenses
• CPC Class Codes: F21W 2111/043 for lighthouses or lightships
• CPC Class Codes: F21Y 2107/30 on the outer surface of cylindrical surfaces, e.g. rod-shaped supports having a circular or a polygonal cross section
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A lighting device having a plurality of high flux LEDs mounted on a heat sink and surrounded by a diffuser. The heat sink serves to transfer heat from the LEDs to the outside environment. In one embodiment the lighting device is positioned within a fresnel lens to produce a distribution of light.

Claims

1. A lighting device comprising:

(a) a plurality of LEDs disposed in a radial array about a vertical axis;

(b) a central member having each LED mounted on a vertical surface thereof, the central member made of a thermally conductive material to conduct heat away from the LEDs, wherein the central member comprises three substantially identical right angle prisms with substantially identical square horizontal cross-sections with four vertical surfaces; and

(c) a hollow member having a dentated surface, wherein the dentated surface surrounds the LEDs to diffuse the light emitted from the LEDs.

2. The lighting device of claim 1, further comprising a curved optical lens disposed about the vertical axis surrounding the hollow member, wherein the lens converges beams of light emanating from the hollow member in all horizontal directions.

3. The lighting device of claim 1 having twelve LEDs.

4. The lighting device of claim 1, wherein the LEDs have a driving current of about 1–

5 Watts.

5. The lighting device of claim 1, wherein the LEDs are enclosed in an airtight enclosure.

6. The lighting device of claim 1, wherein the central member is made of metal.

7. The lighting device of claim 1, wherein the central member is in contact with a thermally conductive element, a portion of said thermally conductive element in contact with the air from outside of the lighting device.

8. The lighting device of claim 1, wherein the LEDs are secured to the central member using a thermally conductive adhesive.

9. The lighting device of claim 1, wherein the hollow member is made of an optically transparent, heat resistant material.

10. The lighting device of claim 1, wherein the hollow member is made of glass.

11. The lighting device of claim 1, further comprising a light socket base electrically connected to the LEDs.

12. The lighting device of claim 1 designed to fit within a fresnel lens of a navigational light.

13. A lighting device comprising:

(a) a plurality of LEDs disposed in a radial array about a vertical axis;

(b) a central member having each LED mounted on a vertical surface thereof, the central member made of a thermally conductive material to conduct heat away from the LEDs, wherein the central member has a first and second circular disk mounted on opposed ends of the central member transverse to the vertical axis of the central member; and

(c) a hollow member having a dentated surface with a random pattern of microfaceted angles on the surface, wherein the microfaceted angles diffuse the light emitted from the LEDs and wherein a first end of the hollow member is mounted in a first groove in the first circular disk and a second opposed end of the hollow member is mounted in a second groove in the second circular disk.

14. The lighting device of claim 13, having four LEDs in the radial array spaced 90 degrees apart in a common horizontal plane.

15. The lighting device of claim 13, wherein the dentated surface of the hollow member is sandblasted.

16. The lighting device of claim 13, wherein the central member has a centralized right angle prism with a square horizontal cross-section.

17. A lighting device comprising:

(a) a plurality of LEDs disposed in a radial array about a vertical axis;

(b) a central member having each LED mounted on a vertical surface thereof, wherein the central member comprises three substantially identical right angle prisms with substantially identical square horizontal cross-sections with four vertical surfaces and wherein the central member is made of a thermally conductive material to conduct heat away from the LEDs;

(c) a hollow member having a dentated surface with a random pattern of microfaceted angles on the surface, wherein the microfaceted angles diffuse the light emitted from the LEDs; and

(d) a curved optical lens disposed about the vertical axis surrounding the hollow member, wherein the lens converges beams of light emanating from the hollow member in all horizontal directions;

whereby light emanating from the LEDs passes through the dentated surface of the hollow member and the optical lens to provide a substantially uniform horizontal plane of light.

18. The lighting device of claim 17, wherein the lens includes a focal point in a horizontal plane that intersects the radial array of LEDs.

19. The lighting device of claim 17, wherein the dentated surface of the hollow member is uniformly frosted.

20. The lighting device of claim 17, wherein the hollow member is a right circular tube.

21. The lighting device of claim 17, wherein each vertical surface of the three substantially identical right angle prisms have one LED mounted thereon.

22. The lighting device of claim 21, wherein one LED is radially mounted every 30 degrees about the vertical axis.

23. A lighting device comprising:

(a) a plurality of LEDs disposed in a radial array about a vertical axis;

(b) a central member having each LED mounted on a vertical surface thereof, wherein the central member has a first and second circular disk mounted on opposed ends of the central member transverse to the vertical axis of the central member and wherein the central member is made of a thermally conductive material to conduct heat away from the LEDs;

(c) a hollow member having a dentated surface with a random pattern of microfaceted angles on the surface, wherein the microfaceted angles diffuse the light emitted from the LEDs and wherein a first end of the hollow member is mounted in a first groove in the first circular disk and a second opposed end of the hollow member is mounted in a second groove in the second circular disk; and

(d) a curved optical lens disposed about the vertical axis surrounding the hollow member, wherein the lens converges beams of light emanating from the hollow member in all horizontal directions;

whereby light emanating from the LEDs passes through the dentated surface of the hollow member and the optical lens to provide a substantially uniform horizontal plane of light.