Heat sinks and lamp incorporating same

• US 9,030,120 B2
• Filed: 10/28/2009
• Issued: 05/12/2015
• Est. Priority Date: 10/20/2009
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Pickard, Paul Kenneth, Negley, Gerald H., Van De Ven, Antony Paul
• Primary Examiner(s): Vu, Jimmy
• Assistant Examiner(s): YANG, AMY X
• Application Number:
  US12/607,355
• Publication Number:
  US 20110089838A1
• Time in Patent Office: 2,022 Days
• Field of Search: 315/113, 315/32, 315/291, 315/45, 362/227, 362/230, 362/249.02, 362/294, 362/296.02
• US Class Current: 315/291
• 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 29/677 the fans being used for discharging
• CPC Class Codes: F21V 29/713 in direct thermal and mechanical contact of each other to form a single system
• CPC Class Codes: F21V 29/763 the planes containing the fins or blades having the direction of the light emitting axis
• 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 29/77 with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 29/87 Organic material, e.g. filled polymer composites; Thermo-conductive additives or coatings therefor
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/12 characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
• 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 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: F28D 2021/0029 Heat sinks
• CPC Class Codes: F28F 1/40 the means being only inside the tubular element
• CPC Class Codes: F28F 3/048 in the form of ribs integral with the element or local variations in thickness of the element, e.g. grooves, microchannels

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.

Claims

1. A lamp, comprising:

at least a first solid state light emitter;

at least a first heat dissipation element that comprises at least one dissipation region sidewall that defines at least one heat dissipation chamber;

a power supply; and

a power supply housing, the power supply in the power supply housing, the first solid state light emitter 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, the lamp configured so that (1) an ambient medium enters the first inlet opening, and then passes through the heat dissipation chamber and exits the first outlet opening, and (2) an ambient medium can enters the first inlet opening and then enters the power supply housing without passing through the heat dissipation chamber.

2. A lamp comprising:

at least a first heat sink structure;

at least a first power supply element;

at least a first solid state light emitter;

at least a first base housing;

a plurality of arms; and

a base,

the first heat sink structure defining at least a first internal space,

the first solid state light emitter on a first surface of the first heat sink structure that is opposite from a second surface of the first heat sink structure that faces the internal space,

at least a portion of the first power supply element inside a space defined by the first base housing, at least portions of the arms extending from the first base housing to the base,

the first heat sink structure supported on the base.

3. A lamp, comprising:

a first group of at least one light emitting diode that, if energized, emits BSY light; and

a second group of at least one light emitting diode that, if energized, emits light that is not BSY light,

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

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,

the lamp an A lamp and providing a wall plug efficiency of at least 90 lumens per watt.

4. A lamp as recited in claim 3, wherein the lamp emits at least 600 lumens when the lamp is energized.

5. A lamp as recited in claim 3, 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.

6. A lamp as recited in claim 3, wherein the lamp emits light having CRI Ra of at least 80 when the lamp is energized.

7. A lamp as recited in claim 3, 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.

8. A lamp as recited in claim 3, 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.

9. A lamp as recited in claim 3, wherein the lamp provides an expected L70 lifetime of at least 25,000 hours.

10. A lamp as recited in claim 3, 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 3, 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 enters the first inlet opening, passes through the heat dissipation chamber and exits the first outlet opening, the first solid state light emitter thermally coupled to the dissipation region sidewall.

12. A lamp, comprising:

at least one solid state light emitter;

a first heat dissipation element; and

at least a first group of inlets comprising a first inlet and a second inlet, the 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 group of openings and a second group of openings, the first group of openings comprising at least one first group opening, the second group of openings comprising at least one second group opening, the lamp configured so that an ambient medium enters into a space beneath the first heat dissipation element through either of the first inlet and the second inlet, and then flows upward through the first group of openings into the heat dissipation chamber, then through the heat dissipation chamber, and then out through the second group of openings, a ratio of a cross-sectional area of the first group of inlets divided by a cross-sectional area of the second group of openings at least 0.90.

13. A lamp as recited in claim 12, 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.

14. A lamp as recited in claim 13, wherein said housing has multiple light emissive surfaces.

15. A lamp as recited in claim 12, wherein said solid state light emitter is mounted on said first heat dissipation element.

16. A lamp as recited in claim 13, wherein said heat dissipation chamber passes through at least a portion of said light emissive housing.