LED lamp

• US 9,541,241 B2
• Filed: 10/03/2013
• Issued: 01/10/2017
• Est. Priority Date: 10/03/2013
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Pickard, Paul Kenneth, Rodgers, Elizabeth
• Primary Examiner(s): Chavez, Renee
• Assistant Examiner(s): Dunay, Christopher E
• Application Number:
  US14/044,936
• Publication Number:
  US 20150098206A1
• Time in Patent Office: 1,195 Days
• Field of Search: 362/255, 362/256, 362/84
• US Class Current: 1/1
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• 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: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A lamp comprises an optically transmissive enclosure and a base. An LED assembly is located in the enclosure and is operable to emit light when energized through an electrical path from the base. The LED assembly comprises an LED and a lumophoric dome that surrounds the LED. A partially reflective pad is on the lumophoric dome for manipulating the pattern of light emitted from the lumophoric dome. A heat sink comprises a heat dissipating portion that is at least partially exposed to the ambient environment and a heat conducting portion that is thermally coupled to the LED. An optically transmissive lens emits light from the enclosure where the lens comprises an annular area defined by a textured surface and a transparent area interior of the annular area.

Claims

1. A lamp comprising:

an enclosure being at least partially optically transmissive;

a base;

at least one LED located in the enclosure and operable to emit light when energized through an electrical path from the base;

a lumophoric dome remote from the at least one LED and surrounding the at least one LED where the lumophoric dome comprises an inside surface and an outside surface, the at least one LED disposed horizontally and positioned adjacent the bottom of the lumophoric dome;

a heat sink comprising a heat dissipating portion that is at least partially exposed to the ambient environment and a heat conducting portion that is thermally coupled to the at least one LED;

an at least partially reflective and partially transmissive pad positioned in the the lumophoric dome between the inside surface and the outside surface, the pad disposed over at least the top of the lumophoric dome opposite the at least one LED and extending for less than the entire dome for manipulating the pattern of light emitted from the lumophoric dome such that some of the light is redirected toward the sides of the lamp.

2. The lamp of claim 1 wherein the base comprises an Edison connector.

3. The lamp of claim 1 wherein the at least one LED is mounted on the heat sink in a center of the enclosure.

4. The lamp of claim 3 wherein the at least one LED is attached to a submount and the submount is thermally and mechanically coupled to the heat sink.

5. The lamp of claim 1 wherein the at least one LED emits blue light and the lumiphoric dome emits a white light.

6. The lamp of claim 1 wherein the at least one LED provides a Lumen output of between 1400 and 1600 Lumens.

7. The lamp of claim 1 wherein the lamp operates at approximately 15 Watts, with approximately 108-110 Lumens per Watt.

8. The lamp of claim 1 wherein the pad comprises a silicone impregnated with TiO2.

9. The lamp of claim 1 further comprising a reflective surface for creating a directional light pattern.

10. The lamp of claim 9 wherein the reflective surface is formed on a lamp housing.

11. The lamp of claim 9 wherein the reflective surface is formed on a reflector located in a lamp housing.

12. The lamp of claim 1 wherein the lumophoric dome is one of a conical shape, a dome-shape, a spherical shape, and a truncated dome shape.

13. The lamp of claim 1 wherein the lumiphoric dome carries a phosphor.

14. The lamp of claim 13 wherein the phosphor is impregnated in the lumiphoric dome.

15. The lamp of claim 13 wherein the phosphor is coated on the lumiphoric dome.

16. The lamp of claim 1 wherein a lamp housing is thermally coupled to the heat sink and is exposed to the exterior of the lamp such that heat from the heat sink may be dissipated to the ambient environment at least partially through the housing.

17. An LED assembly comprising:

at least one LED operable to emit light when energized;

a lumophoric dome comprising an inside surface and an outside surface surrounding the at least one LED;

an at least partially reflective and partially transmissive pad positioned in the lumophoric dome between the inside surface and the outside surface wherein the pad comprises a precursor component and a diffusing material and the pad is molded to the lumophoric dome and extends for less than the entire dome for manipulating the pattern of light emitted from the lumophoric dome such that some of the light is redirected toward the sides of the lamp.

18. The LED assembly of claim 17 wherein the pad is on the outside of the dome.

19. The LED assembly of claim 17 wherein the pad is on the inside of the dome.

20. The LED assembly of claim 17 wherein the pad is partially transmissive.

21. The LED assembly of claim 17 wherein the pad is diffusive.

22. The LED assembly of claim 17 wherein the precursor component comprises silicone.

23. The LED assembly of claim 17 wherein the diffusing material comprises titanium dioxide.

24. A directional lamp comprising:

an enclosure comprising a reflector and an optically transmissive lens for receiving light reflected off of the reflector;

a base connected to the enclosure;

at least one LED located in the enclosure and operable to emit light when energized through an electrical path from the base;

wherein the optically transmissive lens emits light from the enclosure, the lens comprising

a first annular area defining a second area interior of the first annular area, the first annular area defined by a textured surface and the second area being transparent and non-diffusive over the entirety of the second area;

a lumophoric dome comprising an inside surface and an outside surface surrounding the at least one LED; and

an at least partially reflective and partially transmissive pad positioned in the lumophoric dome between the inside surface and the outside surface wherein the pad extends for less than the entire dome.

25. The directional lamp of claim 24 wherein the annular area is adjacent a peripheral edge of the lens.

26. The directional lamp of claim 24 comprising a lumophoric dome remote from the at least one LED and surrounding the at least one LED, the lumophoric dome configured as an inverted truncated cone, and a partially reflective pad on the lumophoric dome.