SOLID-STATE LAMPS WITH PASSIVE COOLING

• US 20110110095A1
• Filed: 10/05/2010
• Published: 05/12/2011
• Est. Priority Date: 10/09/2009
• Status: Abandoned Application

• Current Assignee: Intematix Corporation
• Original Assignee: Intematix Corporation
• Inventors: Li, Yi-Qun, Yang, Haitao
• Application Number:
  US12/898,470
• Publication Number:
  US 20110110095A1
• Time in Patent Office: Days
• US Class Current: 362/294
• CPC Class Codes: F21K 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• 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: F21S 8/026 intended to be recessed in a ceiling or like overhead structure, e.g. suspended ceiling
• CPC Class Codes: F21S 8/033 the surface being a wall or like vertical structure, e.g. building facade
• CPC Class Codes: F21V 29/503 of light sources cooling arrangements structurally associated with gas-discharge or vapour-discharge lamps H01J61/52; cooling arrangements structurally associated with electric incandescent lamps H01K1/58; cooling arrangements structurally associated with light-emitting diodes H01L33/64
• CPC Class Codes: F21V 29/505 of reflectors
• CPC Class Codes: F21V 29/507 of means for protecting lighting devices from damage, e.g. housings
• CPC Class Codes: F21V 29/713 in direct thermal and mechanical contact of each other to form a single system
• CPC Class Codes: F21V 29/74 with 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 29/89 Metals
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A solid-state lamp comprises a body having a first chamber with inlet apertures and a second chamber with outlet apertures. The chambers are interconnected in fluid communication by one or more passages. The lamp further comprises a thermally conductive substrate having a heat radiating surface located within at least one chamber and one or more solid-state light emitters, typically LEDs, mounted in thermal communication with the thermally conductive substrate. The lamp is configured such that in operation heat generated by the LEDs is radiated by the substrate into one or both chambers causing a difference in air pressure between the chambers that results in surrounding air being drawn into the inlet apertures, flowing through the chambers via the interconnecting passages in the substrate and exiting through the outlet apertures thereby cooling the substrate and LEDs.

Claims

1. A solid-state lamp comprising:

a body with a first chamber having inlet apertures and a second chamber having outlet apertures, said chambers being interconnected in fluid communication by at least one passage;

a thermally conductive substrate having a heat radiating surface located within at least one chamber; and

at least one solid-state light emitter mounted in thermal communication with the thermally conductive substrate.

2. The lamp according to claim 1, wherein the thermally conductive substrate comprises heat radiating surfaces located within both chambers.

3. The lamp according to claim 2, wherein the substrate separates the first and second chambers.

4. The lamp according to claim 1, wherein the heat radiating surface is located within at least the first chamber.

5. The lamp according to claim 4, wherein the first chamber has a volume that is less than the volume of the second chamber.

6. The lamp according to claim 5, wherein the total area of the outlet apertures is greater than the total area of the inlet apertures.

7. The lamp according to claim 5, wherein the total area of the outlet apertures is greater than the total area of the passages interconnecting the chambers.

8. The lamp according to claim 5, wherein the total area of the inlet apertures is less than the total area of the passages interconnecting the chambers.

9. The lamp according to claim 4, wherein the heat radiating area of the substrate within the first chamber is greater than the heat radiating surface area within the second chamber.

10. The lamp according to claim 9, wherein the heat radiating surface of the substrate further comprises heat radiating fins.

11. The lamp according to claim 1, wherein the thermally conductive substrate has a thermal conductivity selected from the group consisting of being:

at least 150 Wm<sup>−

1</sup>K<sup>−

1</sup> and at least 200 Wm<sup>−

1</sup>K<sup>−

1</sup>.

12. The lamp according to claim 1, wherein the body has a form selected from the group consisting of being generally:

conical;

cylindrical;

hemispherical; and

spherical.

13. The lamp according to claim 1, wherein the body comprises an exterior shell and further comprising an inner light reflective surface that together with the shell at least in part define the first and second chambers.

14. The lamp according to claim 1, wherein the body has a form factor that resembles a standard form selected from the group consisting:

PAR64;

PAR56;

PAR38;

PAR36, PAR30;

PAR20;

MR16;

MR-11; and

an envelope of an incandescent light bulb.

15. A solid-state reflector lamp comprising:

a body comprising an exterior shell and an inner light reflective surface that together at least in part define a chamber having inlet and outlet apertures;

a thermally conductive partition configured to divide the chamber into first and second chambers such that the first chamber contains the inlet apertures and the second chamber contains the outlet apertures, the partition further comprising at least one passage interconnecting the first and second chambers; and

at least one solid-state light emitter mounted in thermal communication with the thermally conductive partition.

16. The reflector lamp according to claim 15, wherein the first chamber has a volume that is less than the volume of the second chamber.

17. The reflector lamp according to claim 16, wherein the total area of the outlet apertures is greater than the total area of the inlet apertures.

18. The reflector lamp according to claim 15, wherein the thermally conductive partition has a thermal conductivity selected from the group consisting of being:

at least 150 Wm<sup>−

1</sup>K<sup>−

1</sup> and at least 200 Wm<sup>−

1</sup>K<sup>−

1</sup>.

19. The reflector lamp according to claim 15, wherein the exterior shell and inner light reflective surface generally comprise a frustum of a cone and wherein the light reflective surface is disposed substantially coaxially within the exterior shell.

20. The reflector lamp according to claim 19, wherein the thermally conductive partition is generally disc-shaped and located within the exterior shell at the truncated apex of the light reflective surface.

21. The reflector lamp according to claim 19, wherein the light reflective surface is generally parabolic in form.

22. The reflector lamp According to claim 21, wherein the light reflective surface is selected from the group consisting of being:

multifaceted and a substantially continuous surface.

23. The reflector lamp according to claim 19, wherein the exterior shell has a form factor that resembles a standard form selected from the group consisting:

PAR64;

PAR56;

PAR38;

PAR36, PAR30; and

PAR20.