Compact heat sinks and solid state lamp incorporating same

Patent metadata

Field	Value
Publication number	US-9243758-B2
Application number	US-58220609-A
Country	US
Kind code	B2
Filing date	Oct 20, 2009
Priority date	Oct 20, 2009
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

A solid state lamp with efficient heat sink arrangement. To provide adequate cooling utilizing a defined form factor, such as that of the A-lamp incandescent bulb, the interior volume is used more efficiently. As one example, a solid state lamp employs a heat sink with inward facing fins. Solid state light sources, such as light emitting diodes (LEDs), are mounted on the exterior of the heat sink. An air path for convective flow is established through the center of the lamp.

First claim

I claim:

1. A solid state lamp comprising:
a first portion;
a second portion;
at least one solid state light emitter; and
at least a first arm and a second arm,
the first portion comprising a heat sink, the heat sink comprising a plurality of mounting surfaces, the plurality of mounting surfaces defining an opening that extends through the heat sink, at least one of the mounting surfaces having at least one fin that extends into the opening, the second portion comprising an electrical contact,
each of the first and second arms extending in a lengthwise direction from the second portion to the first portion and configured to allow air flow between the first portion and the second portion.

2. The solid state lamp according to claim 1 , wherein the first arm is spaced from the second arm by a distance at least equal to a largest dimension of the second portion in a direction perpendicular to a line segment extending from the first portion to the second portion.

3. The solid state lamp according to claim 1 , wherein the electrical contact comprises one of an Edison screw contact, a GU24 contact or a bayonet contact.

4. The solid state lamp according to claim 1 wherein the first portion has a form factor substantially corresponding to an A lamp.

5. The solid state lamp according to claim 1 , wherein the lamp provides at least about 600 lumens while passively dissipating at least about 6 W of heat.

6. The solid state lamp according to claim 1 , further comprising driver circuitry disposed within the second portion to provide a self-ballasted lamp.

7. A solid state lamp comprising:
at least a first solid state light emitter;
a heat sink, and
a heat sink base,
the heat sink comprising at least one heat sink portion, the at least one heat sink portion comprising at least a first inside surface and at least a first outside surface, at least a portion of the first outside surface opposite at least a portion of the first inside surface, the at least a first inside surface facing and defining a heat sink chamber that extends through an interior of at least a portion of the solid state lamp, the first solid state light emitter on the first outside surface,
the solid state lamp configured such that ambient air can enter a region adjacent to the heat sink chamber from outside the lampthrough openings in an exterior surface of the lamp while moving in a direction substantially perpendicular to an axis of the solid state lamp, said axis a straight line with respect to which the solid state lamp is substantially structurally symmetrical,
the heat sink base in contact with the heat sink,
the heat sink base comprising at least a first base opening, said region adjacent to the heat sink chamber communicating with the heat sink chamber through at least the first base opening,
the heat sink base comprising at least a second opening, the second opening for letting light through the base to enhance illumination configured such that light emitted by the first solid state light emitter can pass through the second opening.

8. A solid state lamp as recited in claim 7 , wherein the solid state lamp is configured such that ambient air can (1) enter the heat sink chamber through openings while moving in a direction substantially perpendicular to an axis of the solid state lamp, and then (2) travel through at least a portion of the solid state lamp in the heat sink chamber while moving substantially parallel to the axis of the solid state lamp.

9. A solid state lamp as recited in claim 7 , wherein the solid state lamp is an A 19 lamp.

10. A solid state lamp as recited in claim 7 , wherein the solid state lamp fits within an A 19 envelope.

11. A solid state lamp as recited in claim 7 , wherein the solid state lamp further comprises at least one lens.

12. A solid state lamp as recited in claim 7 , wherein the solid state lamp further comprises a diffuser.

13. A solid state lamp as recited in claim 7 , wherein the solid state lamp has a correlated color temperature of greater than 2500 K and less than 4500 K.

14. A solid state lamp as recited in claim 7 , wherein the solid state lamp has a CRI Ra of at least 90.

15. A solid state lamp as recited in claim 7 , wherein the solid state lamp has a lumen output of at least about 600 lumens.

16. A solid state lamp as recited in claim 7 , wherein solid state the lamp has a light output of from about 0° to about 150° axially symmetric.

17. A solid state lamp as recited in claim 7 , wherein the solid state lamp provides at least about 600 lumens while passively dissipating at least about 6 W of heat.

18. A solid state lamp comprising:
at least a first solid state light emitter;
a heat sink;
a first portion, a second portion, and at least first and second arms,
the heat sink defining a heat sink chamber that extends through an interior of at least a portion of the solid state lamp,
the solid state lamp configured such that ambient air can enter the heat sink chamber through openings while moving in a direction substantially perpendicular to an axis of the solid state lamp,
the first solid state light emitter in the first portion,
the second portion comprising an electrical contact,
each of the first and second arms extending in a lengthwise direction from the second portion to the first portion,
the first and second arms configured such that ambient air can enter the heat sink chamber through openings between the first and second arms while moving in a direction substantially perpendicular to an axis of the solid state lamp.

19. A solid state lamp as recited in claim 18 , wherein the electrical contact comprises at least one of an Edison screw contact, a GU24 contact or a bayonet contact.

20. A solid state lamp as recited in claim 18 , wherein the solid state lamp further comprises driver circuitry in the second portion to provide a self-ballasted lamp.

Assignees

• Pickard Paul Kenneth
• Cree Inc

Inventors

• Pickard Paul Kenneth

Classifications

• F21V29/86

  Ceramics or glass · CPC title

• F21K9/135 Primary

  Mechanical Engineering · mapped topic

• F21Y2101/02

  Mechanical Engineering · mapped topic

• F21V29/004

  Mechanical Engineering · mapped topic

• F21V29/83

  the elements having apertures, ducts or channels, e.g. heat radiation holes · CPC title