OPTO-THERMAL SOLUTION FOR MULTI-UTILITY SOLID STATE LIGHTING DEVICE USING CONIC SECTION GEOMETRIES

• US 20100327745A1
• Filed: 06/17/2010
• Published: 12/30/2010
• Est. Priority Date: 06/24/2009
• Status: Active Grant

• Current Assignee: Elumigen Llc
• Original Assignee: Elumigen Llc
• Inventors: Dassanayake, Mahendra, Samarabandu, Jagath, De Mel, Srini
• Granted Patent: US 8,186,852 B2
• Time in Patent Office: Days
• US Class Current: 315/35
• 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 1100 includes a cover 18, a housing 16 coupled to the cover 18 and a lamp base 14 coupled to the cover 18. The light assembly 1100 also includes a first circuit board 30 disposed within the housing 16. The first circuit board 30 has a plurality of light sources 32 thereon. A heat sink 210 is thermally coupled to the light sources 32. The heat sink 32 includes a plurality of spaced-apart layers 1140 having outer edges and openings therethrough. Each of the outer edges 1144 are in contact with the housing 16. The light assembly also includes an elongated control circuit board assembly 1110 electrically coupled to the light sources 32 of the first circuit board 30 and the lamp base 14. The control circuit board 1110 extends through the openings 1170. The control circuit board 1110 has a plurality of electrical components 1112 thereon for controlling the light sources 32.

Claims

1. A light assembly comprising:

a cover;

a housing coupled to the cover;

a lamp base coupled to the cover;

a first circuit board disposed within the housing, said first circuit board having a plurality of light sources thereon;

a heat sink thermally coupled to the light sources, said heat sink comprising a plurality of spaced-apart layers having outer edges and openings therethrough, each of the outer edges are in contact with the housing; and

an elongated control circuit board assembly electrically coupled to the light sources of the first circuit board and the lamp base, said control circuit board extending through the openings, said control circuit board having a plurality of electrical components thereon for controlling the light sources.

2. A light assembly as recited in claim 1 wherein the control circuit board comprises a cylindrical circuit board.

3. A light assembly as recited in claim 2 wherein the cylindrical control circuit board is epoxy filled.

4. A light assembly as recited in claim 1 wherein the control circuit board is thermally coupled to the plurality of spaced-apart layers of the heat sink.

5. A light assembly as recited in claim 1 wherein each of the plurality of spaced-apart layers are thermally coupled to the housing.

6. A light assembly as recited in claim 1 wherein the plurality of spaced-apart layers are secured to the housing.

7. A light assembly as recited in claim 1 wherein the plurality of spaced-apart layers are disposed adjacent to a hyperbolic-shaped portion of the housing.

8. A light assembly as recited in claim 5 further comprising perforations through said hyperbolic-shaped portion of the housing.

9. A light assembly as recited in claim 5 further comprising perforations in said hyperboloidal-shaped portion adjacent to the plurality of spaced-apart layers of the heat sink.

10. A light assembly as recited in claim 1 wherein the heat sink comprises a graphite-based material.

11. A light assembly as recited in claim 1 wherein the heat sink comprises an anistropically heat-conducting material.

12. A light assembly as recited in claim 1 wherein the heat sink comprises an isotropically heat-conducting material.

13. A light assembly as recited in claim 1 wherein the openings of the plurality of layers of the heat sink are aligned axially.

14. A light assembly as recited in claim 1 wherein the openings of the heat sink are aligned axially with a longitudinal axis of the light assembly.

15. A light assembly as recited in claim 14 wherein the light sources are disposed in a ring around the longitudinal axis.

16. A light assembly as recited in claim 1 wherein the control circuit board is rectangular and planar.

17. A light assembly as recited in claim 1 wherein the control circuit board extends through the openings and is electrically coupled to the first circuit board.

18. A light assembly as recited in claim 1 wherein the control circuit board is received within grooves in the lamp base.

19. A light assembly as recited in claim 18 wherein the grooves comprise electrical contacts for electrically coupling to edge connectors on the control circuit board.

20. A light assembly as recited in claim 1 wherein the control circuit board comprises wires extending therefrom, said wires received within circuit board openings in the first circuit board.

21. A light assembly as recited in claim 20 wherein the control circuit board is electrically coupled to the first circuit board with the wires.

22. A light assembly as recited in claim 1 wherein the heat sink and first circuit board are integrally formed.

23. A light assembly as recited in claim 1 wherein the openings are rectangular.

24. A light assembly as recited in claim 1 wherein the heat sink comprises a central portion extending between the plurality of layers.