Solid state light assembly having light redirection elements

• US 8,277,082 B2
• Filed: 06/29/2011
• Issued: 10/02/2012
• Est. Priority Date: 06/24/2009
• Status: Active Grant

• Current Assignee: Elumigen Llc
• Original Assignee: Elumigen Llc
• Inventors: Dassanayake, Mahendra, De Mel, Srini, Samarabandu, Jagath
• Primary Examiner(s): Neils, Peggy A.
• Application Number:
  US13/172,379
• Publication Number:
  US 20110255278A1
• Time in Patent Office: 461 Days
• Field of Search: 362/294, 362/373, 362/294.02, 362/240, 362/241, 362/231, 362/800, 362/346, 362/363
• US Class Current: 362/249.02
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 23/009 the casing being inside the housing of the lighting device
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/75 with fins or blades having different shapes, thicknesses or spacing
• CPC Class Codes: F21V 29/767 the planes containing the fins or blades having directions perpendicular to the light emitting axis
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 7/0025 Combination of two or more reflectors for a single light source array of reflectors for a cluster of light sources F21V7/0083
• CPC Class Codes: F21V 7/06 with parabolic curvature
• CPC Class Codes: F21V 7/08 with elliptical curvature
• CPC Class Codes: F21V 7/28 characterised by coatings
• CPC Class Codes: F21V 9/06 for filtering out ultraviolet radiation
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: F21V 9/30 Elements containing photoluminescent material distinct from or spaced from the light source shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40
• CPC Class Codes: F21V 9/35 at focal points, e.g. of refractors, lenses, reflectors or arrays of light sources
• CPC Class Codes: F21Y 2103/33 annular
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A light assembly that includes an enclosure, a circuit board having a plurality of light sources disposed within the enclosure, and a plurality of light redirection elements associated with a respective one of the plurality of light sources. Each of the light redirection elements directs light toward a common point within the enclosure.

Claims

1. A light assembly comprising:

an enclosure;

a circuit board having a plurality of light-emitting diodes disposed within the enclosure; and

a plurality of light redirection elements associated with a respective one of the plurality of light-emitting diodes, each of the light redirection elements redirecting light emitted from the respective one of the plurality of light-emitting diodes toward a common point within the enclosure.

2. A light assembly as recited in claim 1 wherein the circuit board is curved and forms a continuous surface with the enclosure.

3. A light assembly as recited in claim 1 wherein the plurality of light redirection elements directs light along an axis perpendicular to a tangential line of the circuit board.

4. A light assembly as recited in claim 1 wherein the enclosure comprises a cover and housing.

5. A light assembly as recited in claim 4 wherein the cover comprises a center coincident with the common point.

6. A light assembly as recited in claim 5 wherein the cover is ellipsoidal or spheroidal.

7. A light assembly as recited in claim 1 further comprising a heat sink disposed adjacent to the enclosure, said circuit board radiating heat radially outward, the enclosure dissipating heat together with the heat sink.

8. A light assembly as recited in claim 1 further comprising a heat sink comprising fins, said heat sink having an opening aligned with a common axis of the enclosure.

9. A light assembly as recited in claim 1 further comprising a light-shifting element extending across the light redirection elements.

10. A light assembly as recited in claim 9 wherein a center of the light-shifting element is coincident with the common point.

11. A light assembly as recited in claim 9 wherein the light-shifting element comprises a film disposed between the common point and the plurality of light-emitting diodes.

12. A light assembly as recited in claim 11 wherein the film comprises a material having a light-shifting gradient having a first light-shifting rate adjacent to the enclosure and a second light-shifting rate adjacent to a center point of the film greater than the first light-shifting rate.

13. A light assembly as recited in claim 9 wherein the light-shifting element is coupled to the circuit board with a stand-off.

14. A light assembly as recited in claim 9 wherein the light-shifting element is spherical.

15. A light assembly as recited in claim 9 wherein the light-shifting element comprises a dome coupled to the circuit board.

16. A light assembly as recited in claim 9 wherein the light redirection elements comprise a reflective surface disposed within an opening of the circuit board having the light-emitting diodes disposed therein.

17. A light assembly as recited in claim 16 wherein the reflective surface reflects light to the common point.

18. A light assembly as recited in claim 1 wherein the light redirection elements comprise reflectors disposed around each of the light-emitting diodes.

19. A light assembly as recited in claim 18 wherein the reflectors comprise a partial ellipsoid having a first focal point at a light-emitting diode of the plurality of light-emitting diodes and a second focal point at the common point.

20. A light assembly as recited in claim 1 wherein the plurality of light-emitting diodes generates light in the blue or ultra-violet spectrum.