Opto-thermal solution for multi-utility solid state lighting device using conic section geometries

• US 8,186,852 B2
• Filed: 06/17/2010
• Issued: 05/29/2012
• 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:
  US12/817,807
• Publication Number:
  US 20100327745A1
• Time in Patent Office: 712 Days
• Field of Search: 362/249.02, 362/231, 362/294, 362/373, 362/346
• 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 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 base;

a housing coupled to the base, said housing comprising a hyperboloidal portion and a partial rotated ellipsoidal reflector portion that has a major axis offset from an axis of symmetry from the light assembly disposed between a cover and the hyperboloidal portion;

said cover coupled to the housing, said cover comprising a first ellipsoidal portion or spherical portion, said cover comprising a cover center point; and

a circuit board disposed within the housing having a plurality of light-emitting diodes mounted thereon, said rotated partial offset ellipsoidal reflector portion has a first focal point coincident with the cover center point and a plurality of second focal points disposed in a first ring at the circuit board, wherein the light-emitting diodes are arranged on the first ring.

2. A light assembly as recited in claim 1 wherein the base, the housing and the cover comprise a common axis of symmetry.

3. A light assembly as recited in claim 1 wherein said reflector disposed within the cover reflects low angle light from the plurality of light-emitting diodes.

4. A light assembly as recited in claim 3 wherein the reflector is coupled to a circuit board and acts as a heat sink.

5. A light assembly as recited in claim 1 wherein the circuit board is in direct contact with the housing, said housing acting as a heat sink whereby heat generated at the circuit board is conducted radially outward toward the housing and through the housing toward the base.

6. A light assembly as recited in claim 1 further comprising a light-shifting element shifting the light emitted from the light-emitting diodes.

7. A light assembly as recited in claim 6 wherein the light-shifting element comprises a material having a light-shifting gradient having a first light-shifting rate adjacent the cover and a second light-shifting rate adjacent the cover center point greater than the first light-shifting rate at the cover.

8. A light assembly as recited in claim 6 wherein the light-shifting element is coupled to the circuit board with a stand-off.

9. A light assembly as recited in claim 6 wherein the light-shifting element is spaced apart from the light-emitting diodes and is spherical.

10. A light assembly as recited in claim 6 wherein the light-shifting element comprises a dome coupled to the circuit board.

11. A light assembly as recited in claim 6 wherein the light-shifting element comprises a film extending across the cover in a direction perpendicular to an axis of symmetry of the cover.

12. A light assembly comprising:

an enclosure comprising a first portion comprising a first ellipsoidal or spherical portion having a center point therein, a second ellipsoidal portion adjacent to the first portion comprising a partial rotated ellipsoidal reflector portion having a major axis offset from an axis of symmetry of the light assembly and a hyperboloidal portion adjacent to the second ellipsoidal portion; and

a circuit board disposed within the enclosure adjacent to the hyperboloidal portion having a plurality of light-emitting diodes mounted thereon, said ellipsoidal reflector portion has a first focal point coincident with the center point and a plurality of second focal points disposed in a first ring at the circuit board, wherein the light-emitting diodes are disposed in a second ring coincident with the first ring.

13. A light assembly as recited in claim 12 wherein the enclosure comprises a housing comprising the first ellipsoidal portion, a base and a cover comprising the second ellipsoidal portion.

14. A light assembly as recited in claim 13 wherein the base, the housing and the cover comprise a common axis corresponding to the axis of symmetry.

15. A light assembly as recited in claim 14 wherein the second ring has a ring center point aligned with the common axis.