Dimmable LED lamp

• US 8,253,316 B2
• Filed: 05/12/2010
• Issued: 08/28/2012
• Est. Priority Date: 05/13/2009
• Status: Active Grant

• Current Assignee: Light Prescriptions Innovators, LLC
• Original Assignee: Light Prescriptions Innovators, LLC
• Inventors: Sun, Yupin, Falicoff, Waqidi, Shatford, Will
• Primary Examiner(s): Santiago, Mariceli
• Assistant Examiner(s): ZIMMERMAN, GLENN D
• Application Number:
  US12/778,231
• Publication Number:
  US 20100289395A1
• Time in Patent Office: 839 Days
• Field of Search: 313/483, 313/500, 313/502, 257/98, 362/84, 362/231, 362/249.02, 362/555, 362/311.02
• US Class Current: 313/483
• 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 9/61 using light guides
• 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 29/677 the fans being used for discharging
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/78 with helically or spirally arranged fins or blades
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• 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: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED-powered replacement for the conventional incandescent screw-in light bulb comprises a phosphor coated sphere emitting white light into the same spherical pattern as a frosted incandescent bulb. In one embodiment inside the hollow sphere there is a dielectric cone emitting blue light, which causes the phosphor coating to glow. The blue light comes into the cone from a dielectric totally internally reflecting concentrator (DTIRC), which receives light from a conical reflector surrounding an LED array. The array has blue chips for energizing the phosphor and red chips for supplementing the phosphor light, enabling separate electronic control of the color temperature as well as the overall luminosity of the LED Lamp. Both blue and red chips are controlled by a quantum dimmer.

Claims

1. A dimmable lamp comprising:

an array of adjacent light-emitting elements,

a reflector surrounding said array and widening away from the array to an exit aperture,

a dielectric total internally reflecting concentrator with a convex entrance aperture coincident with said exit aperture of said reflector, said concentrator having an exit aperture narrower than said convex entrance aperture situated at an opposite end of said concentrator from said convex entrance aperture,

said exit aperture of said concentrator in optical communication with a ball having a phosphor coating that converts part of the light from said light emitting elements to a different wavelength, and transmits part of the light from said light emitting elements,

the luminosity of said array of light-emitting elements controlled by a quantum dimmer,

wherein the heat from said array and the phosphor is cooled by a helical fin thermal management system, wherein said ball is a hollow dielectric sphere, said exit aperture of said concentrator comprising a dielectric cone with its base coincident with the narrow end of the sidewalls of said concentrator, said dielectric cone surrounded by said hollow dielectric sphere, the tip of said cone near the center of said dielectric sphere.

2. The lamp of claim 1, wherein the light-emitting elements are light-emitting diodes.

3. The lamp of claim 1, wherein the reflector is conical.

4. The lamp of claim 1, wherein said phosphor coating is on an interior surface of said hollow sphere.

5. The lamp of claim 1, wherein the phosphor-coated ball is operative to homogenize the converted part of the light and the transmitted part of the light.

6. The lamp of claim 1, wherein the light-emitting elements comprise elements emitting blue light and elements emitting red light, and wherein the phosphor converts part of the blue light to yellow or green light.

7. A lamp comprising:

a light-emitter,

a reflector surrounding said light emitter and widening away from the light-emitter to an exit aperture,

a dielectric total internally reflecting concentrator with a convex entrance aperture coincident with said exit aperture of said reflector, said concentrator having an exit aperture narrower than said convex entrance aperture situated at an opposite end of said concentrator from said convex entrance aperture,

said exit aperture of said concentrator in optical communication with a dielectric ejector with its base coincident with the narrow end of the sidewalls of said concentrator;

a hollow ball having a phosphor coating that converts part of the light from said light emitter to a different wavelength, and transmits part of the light from said light emitter,

wherein said hollow ball is a dielectric sphere surrounding said ejector, said ejector having a tip near the center of said dielectric sphere.

8. The lamp of claim 7, wherein the light-emitter comprises an array of light-emitting diodes, the luminosity of said array of light-emitting elements controlled by a quantum dimmer.

9. The lamp of claim 7, wherein the reflector is conical.

10. The lamp of claim 7, wherein the ejector is conical.

11. The lamp of claim 7, wherein the heat from said light emitter and the phosphor is cooled by a helical fin thermal management system.

12. The lamp of claim 7, wherein said phosphor coating is on an interior surface of said hollow ball.

13. The lamp of claim 7, wherein the phosphor-coated ball is operative to homogenize the converted part of the light and the transmitted part of the light.

14. The lamp of claim 7, wherein the light-emitter comprises elements emitting blue light and elements emitting red light, and wherein the phosphor converts part of the blue light to yellow or green light.

15. A dimmable LED lamp comprising:

an array of multiple adjacent light-emitting diodes;

a conical reflector surrounding said array and expanding from the array into an exit aperture;

a dielectric total internally reflecting concentrator with its convex entrance aperture coincident with the said exit aperture of said conical reflector;

said concentrator having its own exit aperture situated at the opposite end from said convex entrance aperture;

said exit aperture of said concentrator comprising a dielectric ejector with its base coincident with the narrow end of the sidewalls of said concentrator;

said dielectric ejector surrounded by a hollow dielectric ball with a phosphor coating on its interior surface, said ejector having a tip near the center of said dielectric ball;

the luminosity of said LED array controlled by a quantum dimmer;

wherein the heat from said LED array and the phosphor is cooled by a helical fin thermal management system.

16. The lamp of claim 15, wherein the ejector is a cone.

17. The lamp of claim 15, wherein the ball is a sphere.