HEAT SINKS AND LAMP INCORPORATING SAME

• US 20110089830A1
• Filed: 01/07/2010
• Published: 04/21/2011
• Est. Priority Date: 10/20/2009
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: Cree Lighting Company (Ideal Industries Incorporated)
• Inventors: PICKARD, Paul Kenneth, Van De Ven, Antony Paul, Negley, Gerald H., Medendorp, Nicholas W. JR.
• Granted Patent: US 9,217,542 B2
• Time in Patent Office: Days
• US Class Current: 315/32
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21V 29/507 of means for protecting lighting devices from damage, e.g. housings
• CPC Class Codes: F21V 29/54 using thermoelectric means, e.g. Peltier elements
• CPC Class Codes: F21V 29/63 using electrically-powered vibrating means; using ionic wind
• CPC Class Codes: F21V 29/677 the fans being used for discharging
• CPC Class Codes: F21V 29/71 using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/75 with fins or blades having different shapes, thicknesses or spacing
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 29/85 characterised by the material liquid coolants F21V29/56
• CPC Class Codes: F21Y 2107/00 Light sources with three-dimensionally disposed light-generating elements
• CPC Class Codes: F21Y 2107/30 on the outer surface of cylindrical surfaces, e.g. rod-shaped supports having a circular or a polygonal cross section
• 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

A lamp comprising a solid state light emitter, the lamp being an A lamp and providing a wall plug efficiency of at least 90 lumens per watt. Also, a lamp comprising a solid state light emitter and a power supply, the emitter being mounted on a heat dissipation element, the dissipation element being spaced from the power supply. Also, a lamp, comprising a solid state light emitter and a heat dissipation element that has a heat dissipation chamber, whereby an ambient medium can enter the chamber, pass through the chamber, and exit. Also, a lamp, comprising a light emissive housing at least one solid state lighting emitter and a first heat dissipation element. Also, a lamp comprising a heat sink comprising a heat dissipation chamber. Also, a lamp comprising first and second heat dissipation elements. Also, a lamp comprising means for creating flow of ambient fluid.

Claims

1. A lamp, comprising at least a first solid state light emitter, the lamp being an A lamp and providing a wall plug efficiency of at least 90 lumens per watt.

2. A lamp as recited in claim 1, wherein the lamp emits at least 600 lumens when the lamp is energized.

3. A lamp as recited in claim 1, wherein the lamp further comprises a power line, and if line voltage is supplied to the power line, the lamp emits at least 600 lumens.

4. A lamp as recited in claim 1, wherein the lamp emits light having CRI Ra of at least 80 when the lamp is energized.

5. A lamp as recited in claim 1, wherein the lamp comprises:

at least one solid state light emitter that, if energized, emits BSY light; and

at least one solid state light emitter that, if energized, emits light that is not BSY light.

6. A lamp as recited in claim 5, wherein when the lamp is energized, a mixture of light emitted by the solid state light emitters in the lamp is within about 10 MacAdam ellipses of the blackbody locus on a 1931 CIE Chromaticity Diagram.

7. A lamp as recited in claim 5, wherein the at least one solid state light emitter that, if energized, emits light that is not BSY light emits light that has a dominant wavelength in the range of from about 600 nm to about 630 nm.

8. A lamp as recited in claim 5, wherein:

the at least one solid state light emitter that, if energized, emits BSY light comprises a first group of at least one light emitting diode,

the at least one solid state light emitter that, if energized, emits light that is not BSY light comprises a second group of at least one light emitting diode,

the first and second groups of light emitting diodes are mounted on at least one circuit board, and

an average distance between a center of each light emitting diode in the first group and a closest point on an edge of the circuit board on which that light emitting diode is mounted is smaller than an average distance between a center of each light emitting diode in the second group and a closest point on an edge of the circuit board on which that light emitting diode is mounted.

9. A lamp as recited in claim 1, wherein the lamp provides an expected L70 lifetime of at least 25,000 hours.

10. A lamp as recited in claim 1, wherein the lamp emits light in at least 50% of all directions extending from a center of the lamp.

11. A lamp as recited in claim 1, wherein the lamp comprises at least one heat dissipation chamber defined by at least one dissipation region sidewall, the chamber having at least a first inlet opening and at least a first outlet opening, whereby an ambient medium can enter the first inlet opening, pass through the heat dissipation chamber and exit the first outlet opening, the first solid state light emitter being thermally coupled to the dissipation region sidewall.

12. A lamp, comprising:

at least a first solid state light emitter; and

a power supply,

the first solid state light emitter being mounted on a heat dissipation element,

the power supply being electrically connected to the first solid state light emitter so that when line voltage is supplied to the power supply, the power supply feeds current to the first solid state light emitter,

the heat dissipation element being spaced from the power supply.

13. A lamp as recited in claim 12, wherein the lamp further comprises:

means for dissipating heat from the heat dissipation element; and

means for dissipating heat from the power supply.

14. A lamp as recited in claim 12, wherein the power supply is positioned within a base element, and at least 50 percent of a space defined by all points that are located between the heat dissipation element and the base element is filled with an ambient medium.

15. A lamp as recited in claim 14, wherein the ambient medium is gaseous.

16. A lamp as recited in claim 12, wherein when line voltage is supplied to the power supply:

the power supply feeds current to the first solid state light emitter,

at least some heat generated by the first solid state light emitter is dissipated by the heat dissipation element,

at least some heat generated by the power supply is dissipated from a power supply heat dissipation element at a location that is spaced from the heat dissipation element, and

not more than 10 percent of the heat generated by the first solid state light emitter is dissipated from the power supply heat dissipation element.

17. A lamp as recited in claim 12, wherein the lamp is an A lamp.

18. A lamp as recited in claim 12, wherein the heat dissipation element comprises at least one dissipation region sidewall that defines at least one heat dissipation chamber, the heat dissipation chamber having at least a first inlet opening and at least a first outlet opening, whereby an ambient medium can enter the first inlet opening, pass through the heat dissipation chamber and exit the first outlet opening.

19. A lamp as recited in claim 18, wherein a ratio of a cross-sectional area of the first inlet opening divided by a cross-sectional area of the first outlet opening is at least 0.90.

20. A lamp as recited in claim 18, wherein the cross-sectional area of the first inlet opening is at least 600 square millimeters

21. A lamp as recited in claim 20, wherein the cross-sectional area of the first outlet opening is at least 600 square millimeters.

22. A lamp, comprising:

at least a first solid state light emitter; and

at least a first heat dissipation element that defines at least one heat dissipation chamber, the first heat dissipation element comprising at least one dissipation region sidewall,

the first solid state light emitter being thermally coupled to the first heat dissipation element,

the heat dissipation chamber having at least a first inlet opening and at least a first outlet opening, whereby an ambient medium can enter the first inlet opening, pass through the heat dissipation chamber and exit the first outlet opening.

23. A lamp as recited in claim 22, wherein the lamp further comprises at least a first active cooling device.

24. A lamp as recited in claim 23, wherein the first active cooling device can blow ambient fluid.

25. A lamp as recited in claim 22, wherein:

the lamp comprises a bottom element, a top element and at least one side element,

at least one solid state light emitter is mounted on the top element,

at least one solid state light emitter is mounted on each of the at least one side element.

26. A lamp as recited in claim 22, wherein the lamp further comprises means for diffusing light exiting the lamp and allowing ambient fluid to exit the lamp.

27. A lamp as recited in claim 22, wherein the lamp further comprises means for thermally isolating at least the first solid state light emitter from at least a second solid state light emitter.

28. A lamp as recited in claim 22, wherein a ratio of a cross-sectional area of the first inlet opening divided by a cross-sectional area of the first outlet opening is at least 0.90.

29. A lamp as recited in claim 22, wherein the cross-sectional area of the first inlet opening is at least 600 square millimeters

30. A lamp as recited in claim 29, wherein the cross-sectional area of the first outlet opening is at least 600 square millimeters.

31. A lamp as recited in claim 22, wherein the lamp is an A lamp.

32. A lamp as recited in claim 22, wherein the first heat dissipation element further comprises at least one fin that extends into the heat dissipation chamber.

33. A lamp as recited in claim 22, wherein when line voltage is supplied to the lamp, the at least a first solid state light emitter generates heat that is dissipated in ambient medium located inside the heat dissipation chamber, causing the ambient medium located inside the heat dissipation chamber to absorb heat, causing the ambient medium located inside the heat dissipation chamber to rise and exit through the first outlet opening, thereby generating negative pressure within the heat dissipation chamber and causing ambient medium that is outside the heat dissipation chamber to enter the first inlet opening into the heat dissipation chamber.

34. A lamp, comprising:

at least one solid state lighting emitter; and

a first heat dissipation element thermally coupled to said at least one solid state emitter, said first heat dissipation element comprising at least one heat dissipation chamber, said heat dissipation chamber comprising at least a first opening and at least a second opening, whereby an ambient medium flows through the heat dissipation chamber.

35. A lamp as recited in claim 34, wherein said solid state light emitter is mounted within a light transmissive housing, and said heat dissipation chamber passes through at least a portion of said light emissive housing.

36. A lamp as recited in claim 34, wherein said housing has multiple light emissive surfaces.

37. A lamp as recited in claim 34, wherein said solid state light emitter is mounted on said first heat dissipation element.

38. A lamp as recited in claim 34, wherein said heat dissipation chamber passes through at least a portion of said light emissive housing.

39. A lamp, comprising:

at least one solid state light emitter; and

means for dissipating heat generated by the at least one solid state light emitter.

40. A solid state lamp, comprising:

at least two solid state light emitters, the at least two solid state light emitters being disposed so that a primary axis of a light output of one of the at least two light emitters is in a direction in which the other of the at least two solid state light emitters directs no light; and

a heat sink disposed between the at least two light emitters and defining a space between the at least two light emitters that is exposed to an environment for heat dissipation.

41. The solid state lamp according to claim 40, further comprising at least one lens disposed opposite the heat sink from at least one of the at least two solid state light emitters.

42. The solid state lamp according to claim 41, wherein the heat sink and the lens define at least one cavity in which the solid state light emitters are disposed.

43. The solid state lamp according to claim 42, further comprising a reflector in the at least one cavity.

44. The solid state lamp according to claim 43, further comprising a diffuser associated with the at least one cavity to diffuse light from at least one of the solid state light emitters.

45. The solid state lamp according to claim 40, wherein the heat sink comprises a substantially hollow structure having fins disposed therein, the hollow portion of the heat sink being disposed opposite from the direction of light emission by each of the at least two solid state light emitters.

46. The solid state lamp according to claim 40, wherein the lamp is contained within the envelope of an A lamp.

47. The solid state lamp according to claim 40, wherein the lamp has a correlated color temperature of greater than 2500 K and less than 4500 K.

48. The solid state lamp according to claim 47, wherein the lamp has a CRI Ra of 90 or greater.

49. The solid state lamp according to claim 40, wherein the lamp has a lumen output of about 600 lumens or greater.

50. The solid state lamp according to claim 49, wherein the lamp has a light output of from about 0°

to about 150°

axially symmetric.

51. A solid state lamp comprising:

a heat sink comprising a plurality of mounting surfaces, the plurality of mounting surfaces defining a heat dissipation chamber, at least one of the mounting surfaces having at least one fin that extends into the heat dissipation chamber;

at least one solid state light emitter mounted on the heat sink.

52. A solid state lamp as recited in claim 51, wherein the lamp further comprises at least one lens.

53. The solid state lamp according to claim 51, comprising:

a lower portion comprising an electrical contact;

an upper portion comprising the heat sink; and

a stand for connecting the lower portion and the upper portion configured to allow air flow between the upper portion and the lower portion.

54. The solid state lamp according to claim 53, wherein the electrical contact comprises an Edison screw contact, a GU24 contact or a bayonet contact.

55. The solid state lamp according to claim 53, wherein the upper portion has a form factor substantially corresponding to an A lamp.

56. The solid state lamp according to claim 53, wherein the lamp provides at least about 600 lumens while passively dissipating at least about 6 W of heat.

57. The solid state lamp according to claim 53, further comprising driver circuitry disposed within the lower portion to provide a self-ballasted lamp.

58. A heat sink for a solid state lighting device, comprising:

a main body section that defines a central opening extending longitudinally along the main body section;

at least one inwardly extending fin extending from the main body section into the central opening.

59. The heat sink according to claim 58, wherein the at least one outwardly facing mounting surface comprises a plurality of outwardly facing mounting surfaces.

60. The heat sink according to claim 58, wherein the at least one inwardly extending fin comprises a plurality of inwardly extending fins.

61. The heat sink according to claim 58 having an outer profile small enough to fit within the profile of an A lamp.

62. A lamp, comprising:

at least a first solid state light emitter; and

at least first and second heat dissipation elements,

a heat dissipation region being located between the first and second heat dissipation elements,

at least one protrusion extending from the first heat dissipation element into the heat dissipation region,

the first solid state light emitter being thermally coupled to the first heat dissipation element.

63. A lamp as recited in claim 62, wherein:

the first heat dissipation element comprises a first face plate,

the second heat dissipation element comprises a second face plate,

the heat dissipation region is defined by a region between the an inside surface of the first face plate and an inside surface of the second face plate,

a first plurality of solid state light emitters are mounted on an outside surface of the first face plate and a second plurality of solid state light emitters are mounted on an outside surface of the second face plate.

64. A lamp as recited in claim 63, wherein the inside surface of the first face plate and the inside surface of the second face plate are substantially parallel.

65. A lamp, comprising:

at least first and second heat dissipation elements;

at least a first solid state light emitter that emits light of a first color, the first solid state light emitter being mounted on the first heat dissipation element; and

at least a second solid state light emitter that emits light of a second color, the second solid state light emitter being mounted on the second heat dissipation element.

66. A lamp as recited in claim 65, wherein:

the lamp comprises a plurality of solid state light emitters that emit light of the first color;

the lamp comprises a plurality of solid state light emitters that emit light of the second color;

all of the solid state light emitters that emit light of the first color are mounted on the first heat dissipation element, and

all of the solid state light emitters that emit light of the second color are mounted on the second heat dissipation element.

67. A lamp, comprising:

at least one solid state light emitter; and

means for creating flow of ambient fluid.

68. A lamp as recited in claim 67, wherein the means for creating flow of ambient fluid comprises at least one active cooling device.

69. A lamp as recited in claim 67, wherein the means for creating flow of ambient fluid consists of passive cooling.

70. A lamp as recited in claim 67, wherein the lamp further comprises means for thermally isolating at least a first solid state light emitter from at least a second solid state light emitter.

71. A lamp, comprising:

at least one solid state light emitter;

at least one dissipation chamber; and

means for creating flow of ambient fluid through the dissipation chamber.

72. A lamp as recited in claim 71, wherein the means for creating flow of ambient fluid comprises at least one active cooling device.

73. A lamp as recited in claim 71, wherein the means for creating flow of ambient fluid consists of passive cooling.

74. A lamp, comprising:

at least a first solid state light emitter; and

at least a first air purifying device.

75. A lamp as recited in claim 74, wherein the first air purifying device comprises at least one electrostatic accelerator.

76. A lamp as recited in claim 74, wherein the first air purifying device provides active cooling for the lamp.

77. A lamp as recited in claim 74, wherein:

the lamp further comprises at least a first heat dissipation element that defines at least one heat dissipation chamber,

the first solid state light emitter is thermally coupled to the first heat dissipation element,

the heat dissipation chamber has at least a first inlet opening and at least a first outlet opening, whereby an ambient medium can enter the first inlet opening, pass through the heat dissipation chamber and exit the first outlet opening, and

the first air purifying device pushes ambient medium through the heat dissipation chamber.