LED illumination source with improved visual characteristics

• US 8,579,470 B1
• Filed: 11/27/2012
• Issued: 11/12/2013
• Est. Priority Date: 10/03/2011
• Status: Active Grant

• Current Assignee: Solais Lighting, Inc. (Southern Company)
• Original Assignee: Solais Lighting, Inc. (Southern Company)
• Inventors: Leahy, James, Hartswick, Chris, Johnson, Stephen
• Primary Examiner(s): TSO, LAURA K
• Application Number:
  US13/686,403
• Time in Patent Office: 350 Days
• Field of Search: 362/254, 362/249.02, 362/311.02
• US Class Current: 362/249.02
• CPC Class Codes: F21K 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21V 11/06 using crossed laminae or strips , e.g. grid-shaped louvers; using lattices or honeycombs
• CPC Class Codes: F21V 7/04 Optical design
• CPC Class Codes: F21V 7/041 with conical or pyramidal surface
• CPC Class Codes: F21V 7/06 with parabolic curvature
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An illumination source is disclosed that features, in one embodiment, an at least generally conical body extending outward along an axis of illumination, a socket supported with respect to the body having a pair of connector surfaces for receiving power and having an axis of insertion at least generally parallel to the axis of illumination, and one or more LED illumination elements supported with respect to the body such that at least a portion of their illumination axes are at least generally parallel to the axis of illumination of the source. A power supply has electrical inputs operatively connected to the socket and electrical outputs operatively connected to the LED illumination elements, and a front face is positioned opposite the socket along the illumination axis. An optical light-directing element is provided separate from any optical process or packaging surfaces built onto the LEDs, is disposed between the LED illumination elements and the front face, and has medial and distal ends, with the distal end being spaced away from the front face.

Claims

1. An illumination source, comprising:

an at least generally conical body extending outward along an axis of illumination for the source,

a socket supported with respect to the body, having a pair of connector surfaces for receiving power, and having an axis of insertion at least generally parallel to the axis of illumination,

one or more LED illumination elements supported with respect to the body such that at least a portion of their illumination axes are at least generally parallel to the axis of illumination of the source,

a power supply having electrical inputs operatively connected to the socket and electrical outputs operatively connected to the LED illumination elements,

a front face positioned opposite the socket along the illumination axis, and

an optical light-directing element separate from any optical process or packaging surfaces built onto the LEDs, being disposed between the LED illumination elements and the front face, and having medial and distal ends, with the distal end being spaced away from the front face, wherein the optical light-directing element includes a collimating element.

2. The apparatus of claim 1 wherein the optical light-directing element includes a lens element.

3. The apparatus of claim 2 wherein the lens element includes a TIR or Fresnel element.

4. The apparatus of claim 1 wherein the optical light-directing element includes a reflective surface.

5. The apparatus of claim 1 wherein the reflective surface is shaped as a circular truncated section of a right cone.

6. The apparatus of claim 1 wherein the optical light-directing element includes a snoot.

7. The apparatus of claim 1 wherein the front face is clear and wherein the optical light-directing element is placed at a sufficient distance from the front face to significantly reduce an angle of view of the LED illumination elements while allowing light to form a spot beam through the front face.

8. The apparatus of claim 1 wherein the front face is dimpled or frosted and wherein the optical light-directing element is placed at a sufficient distance from the front face to significantly reduce an angle of view of the LED illumination elements while allowing light to form a flood beam through the front face.

9. The apparatus of claim 1 wherein the front face is dimpled or frosted and wherein the optical light-directing element is placed at a sufficient distance from the front face to significantly reduce an angle of view of the LED illumination elements while allowing light to form a directional beam through the front face.

10. The apparatus of claim 1 wherein the optical light-directing element is placed at a sufficient distance from the front face to significantly reduce an angle of view of the LED illumination elements while allowing light to reach substantially all of the front face.

11. The apparatus of claim 1 wherein the angle of view of the LED illumination elements is 65 degrees or less about the axis of illumination.

12. The apparatus of claim 1 wherein the angle of view of the LED illumination elements is 55 degrees or less about the axis of illumination.

13. The apparatus of claim 1 wherein the angle of view of the LED illumination elements is 45 degrees or less about the axis of illumination.

14. The apparatus of claim 1 wherein the optical light-directing element is mounted on the body of the source.

15. The apparatus of claim 1 wherein the source includes a plurality of LEDs.

16. The apparatus of claim 15 wherein the LEDs are supported by a metal core board that support them in relation to an outer edge of the housing that limits the field of view of the LEDS.

17. The apparatus of claim 1 wherein the illumination source is a PAR-type replacement lamp.

18. The apparatus of claim 1 wherein the illumination source is a BR-type replacement lamp.

19. The apparatus of claim 1 wherein the optical light-directing element is separated from the front face by at least 0.5 inches.

20. The apparatus of claim 19 wherein the optical light-directing element is separated from the front face by at least 1 inch.

21. The apparatus of claim 19 wherein the optical light-directing element is separated from the front face by at least 1.5 inches.

22. An illumination source, comprising:

an at least generally conical body extending outward along an axis of illumination of the source,

a socket supported with respect to the body, having a pair of connector surfaces for receiving power, and having an axis of insertion at least generally parallel to the axis of illumination,

one or more LED illumination elements supported with respect to the body such that at least a portion of their illumination axes are at least generally parallel to the axis of illumination of the source,

a power supply having electrical input operatively connected to the socket and electrical outputs operatively connected to the LED illumination elements,

a front face positioned opposite the socket along the illumination axis, and

an optical light-directing element separate from any optical process or packaging surfaces built onto the LEDs, being disposed between the LED illumination elements and the front face, and having medial and distal ends, with the distal end being spaced away from the front face, wherein the optical light-directing element includes a TIR.

23. An illumination source, comprising:

an at least generally conical body extending outward along an axis of illumination for the source,

a socket supported with respect to the body, having a pair of connector surfaces for receiving power, and having an axis of insertion at least generally parallel to the axis of illumination,

one or more LED illumination elements supported with respect to the body such that at least a portion of their illumination axes are at least generally parallel to the axis of illumination of the source,

a power supply having electrical inputs operatively connected to the socket and electrical outputs operatively connected to the LED illumination elements,

a front face positioned opposite the socket along the illumination axis, and

an optical light-directing element separate from any optical process or packaging surfaces built onto the LEDs, being disposed between the LED illumination elements and the front face, and having medial and distal ends, with the distal end being spaced away from the front face, wherein the optical light directing element includes at least one opaque surface mounted on the source that is positioned to block light between at least one of the LED illumination elements and positions outside of the circumference of the front face aperture and opposite the base with respect to the front face aperture.

24. An illumination source, comprising:

an at least generally conical body extending outward along an axis of illumination for the source,

a socket supported with respect to the body, having a pair of connector surfaces for receiving power, and having an axis of insertion at least generally parallel to the axis of illumination,

one or more LED illumination elements supported with respect to the body such that at least a portion of their illumination axes are at least generally parallel to the axis of illumination of the source,

a power supply having electrical inputs operatively connected to the socket and electrical outputs operatively connected to the LED illumination elements,

a front face positioned opposite the socket along the illumination axis, and an optical light-directing element separate from any optical process or packaging surfaces built onto the LEDs, being disposed between the LED illumination elements and the front face, and having medial and distal ends, with the distal end being spaced away from the front face, wherein the optical light-directing element is separated from the front face by at least 0.5 inches.

25. The apparatus of claim 24 wherein the optical light-directing element is separated from the front face by at least 1 inch.

26. The apparatus of claim 25 wherein the optical light-directing element is separated from the front face by at least 1.5 inches.

27. An illumination method, comprising:

receiving power at a socket,

converting the received power and sending it to one or more LED elements,

redirecting light from the LED powered elements by a lens element,

shining the redirected light through an optically neutral area, and

shining the redirected light through a front face after it has shined through for optically neutral area.

28. The method of claim 27 wherein the step of redirecting shields the LED elements from view from at least a subset of an area illuminated through the front face.

29. An illumination source, comprising:

means for receiving power,

means converting received power and sending it to one or more LED elements,

means for colimating at least some of the light from the LED powered elements,

optically neutral means for passing the redirected light, and

front face means for passing the redirected light after it has passed through the optically neutral area.