Portable light having a heat dissipater with an integral cooling device

• US 9,200,792 B2
• Filed: 11/17/2010
• Issued: 12/01/2015
• Est. Priority Date: 11/24/2009
• Status: Active Grant

• Current Assignee: Streamlight, Inc.
• Original Assignee: Streamlight, Inc.
• Inventors: Sharrah, Raymond L., Ziegenfuss, Peter J.
• Primary Examiner(s): Husar, Stephen F
• Assistant Examiner(s): ALLEN, DANIELLE NICOLE
• Application Number:
  US12/948,285
• Publication Number:
  US 20110121727A1
• Time in Patent Office: 1,840 Days
• Field of Search: 362/373, 362/158, 362/477, 362/183, 362/307, 362/235, 362/345, 362/208, 362/294, 362/206, 362/188, 362/202, 362/203, 362/119, 362/205, 362/396, 362/390, 362/485, 362/236, 362/198, 362/194, 362/800, 362/249.04, 362/218, 362/555, 362/362, 362/157, 362/184, 362/219, 362/225, 362/227, 362/231, 362/23.07, 362/23.19, 362/311.02, 313 44- 46, 703/6, 716/108, 600/178, 600/245, 600/199, 600/249, 606/30, 607/88, 222/394, 222/395, 117/13, 345/905
• US Class Current: 1/1
• CPC Class Codes: F21L 4/00 Electric lighting devices with self-contained electric batteries or cells
• CPC Class Codes: F21V 29/67 characterised by the arrangement of fans
• 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 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A portable light or device or heat dissipater may comprise a heat sink for having a light source or other heat generating element thermally coupled thereto, and having a plurality of walls extending from a side thereof for defining a cavity and plural passages, a fluid mover in the cavity of the heat sink for selectively causing a fluid to move through the cavity and the plural passages, and a light source or other heat generating element adjacent to and thermally coupled to the heat sink. The heat dissipater may be connected to a housing in various configurations.

Claims

1. A portable light heat dissipater comprising:

a heat sink having a cylindrical wall wherein a portion of the cylindrical wall defines a base, the base having first and second opposing sides, the first side being on the exterior of the cylindrical wall for having a light source thermally coupled thereto, and the second side of the base and the interior of the cylindrical wall having a plurality of walls extending inwardly therefrom interior the cylindrical wall for defining a plurality of interior axial fluid passages therethrough;

an elongated hollow tubular member defining a fluid passage therethrough;

a pivotable joint supporting said heat sink at a first end of the elongated hollow tubular member, whereby said heat sink is pivotable to different orientations relative to said elongated hollow tubular member;

a flexible sheath between the first end of said elongated hollow tubular member and said heat sink for defining a fluid passage between the fluid passage of said elongated hollow tubular member and the plurality of interior axial fluid passages of said heat sink;

a fluid mover disposed in the fluid passage of said elongated hollow tubular member near an end thereof remote from said heat sink for selectively causing a fluid to move through the fluid passages of said elongated hollow tubular member and said flexible sheath and through the plurality of interior axial fluid passages defined by the walls of said heat sink; and

a light source disposed adjacent to and thermally coupled to the first side of the base of said heat sink, whereby said light source is cooled by fluid moved by said fluid mover through the fluid passage defined by said elongated hollow tubular member, the fluid passage defined by said flexible sheath and the interior axial fluid passages defined by said heat sink.

2. The portable light heat dissipater of claim 1 further comprising:

an electronic circuit coupled to said heat sink for controlling electrical power applied to said light source;

or

an electronic circuit coupled to said heat sink for controlling operation of said fluid mover;

or

an electronic circuit coupled to said heat sink for controlling electrical power applied to said light source and operation of said fluid mover.

3. The portable light heat dissipater of claim 2 wherein said electronic circuit controls electrical power applied to said light source or controls operation of said fluid mover or controls both responsive to the temperature of said light source.

4. The portable light heat dissipater of claim 2 wherein the electronic circuit is disposed on a circuit board defining a periphery of a given shape and size, and wherein said heat sink has a recess in the first side thereof, the recess having a shape and size corresponding to the given shape and size of the periphery of said circuit board, and wherein said circuit board is disposed in the recess.

5. The portable light heat dissipater of claim 1 wherein said heat sink includes at least one heat pipe coupling the first side of the base thereof and at least one of the plurality of walls of the second side of the base thereof.

6. The portable light heat dissipater of claim 1 wherein said light source comprises:

a high power light emitting diode;

or

an array of light emitting diodes;

or

a high power light emitting diode and an array of light emitting diodes.

7. The portable light heat dissipater of claim 1 wherein said fluid mover includes a fan for moving air.

8. The portable light heat dissipater of claim 1 further comprising:

a cover adjacent said heat sink and having openings therethrough through which the fluid moved by said fluid mover moves;

or

a cover adjacent said heat sink and having vents through which the fluid moved by said fluid mover moves, wherein the vents are downward facing when said heat sink is at an upward end of said elongated hollow tubular member.

9. The portable light heat dissipater of claim 1 wherein said movable joint includes an articulated joint providing at least two degrees of freedom of movement.

10. The portable light heat dissipater of claim 1 further comprising:

a source of electrical power at the end of said hollow tubular member proximate said fluid mover.

11. A portable heat dissipater comprising:

a heat sink having a cylindrical wall wherein a portion of the cylindrical wall defines a base, the base having first and second opposing sides, the first side being on the exterior of the cylindrical wall for having a heat generating element thermally coupled thereto, and the second side of the base and the interior of the cylindrical wall having a plurality of walls extending inwardly therefrom interior the cylindrical wall for defining a plurality of interior axial fluid passages therethrough;

an elongated hollow tubular member defining a fluid passage therethrough;

a pivotable joint supporting said heat sink at a first end of the elongated hollow tubular member, whereby said heat sink is pivotable to different orientations relative to said elongated hollow tubular member;

a flexible sheath between the first end of said elongated hollow tubular member and said heat sink for defining a fluid passage between the fluid passage of said elongated hollow tubular member and the plurality of interior axial fluid passages of said heat sink;

a fluid mover disposed in the fluid passage of said elongated hollow tubular member near an end thereof remote from said heat sink for selectively causing a fluid to move through the fluid passages of said elongated hollow tubular member and said flexible sheath and through the plurality of interior axial fluid passages defined by the walls of said heat sink; and

a heat generating element disposed adjacent to and thermally coupled to the first side of the base of said heat sink, whereby said heat generating element is cooled by fluid moved by said fluid mover through the fluid passage defined by said elongated hollow tubular member, the fluid passage defined by said flexible sheath and the interior axial fluid passages defined by said heat sink.

12. The portable heat dissipater of claim 11 further comprising:

an electronic circuit proximate said heat sink for controlling electrical power applied to said heat generating element;

or

an electronic circuit proximate said heat sink for controlling operation of said fluid mover;

or

an electronic circuit proximate said heat sink for controlling electrical power applied to said heat generating element and operation of said fluid mover.

13. The portable heat dissipater of claim 12 wherein said electronic circuit controls electrical power applied to said heat generating element or controls operation of said fluid mover or controls both responsive to the temperature of said heat generating element.

14. The portable heat dissipater of claim 12 wherein the electronic circuit is disposed on a circuit board defining a periphery of a given shape and size, and wherein said heat sink has a recess in the first side thereof, the recess having a shape and size corresponding to the given shape and size of the periphery of said circuit board, and wherein said circuit board is disposed in the recess.

15. The portable heat dissipater of claim 11 wherein said heat sink includes at least one heat pipe coupling the first side of the base thereof and at least one of the plurality of walls on the second side of the base thereof.

16. The portable heat dissipater of claim 11 wherein said heat generating element includes:

at least one light emitting diode;

or

a high power light emitting diode;

or

an array of light emitting diodes;

or

a high power light emitting diode and an array of light emitting diodes.

17. The portable heat dissipater of claim 11 wherein said fluid mover includes a fan for moving air.

18. The portable heat dissipater of claim 11 further comprising:

a cover adjacent said heat sink and having openings therethrough through which the fluid moved by said fluid mover moves;

or

a cover adjacent said heat sink and having vents through which the fluid moved by said fluid mover moves, wherein the vents are downward facing when said heat sink is at an upward end of said elongated hollow tubular member.

19. The portable heat dissipater of claim 11 wherein said movable joint includes an articulated joint providing at least two degrees of freedom of movement.

20. The portable heat dissipater of claim 11 further comprising:

a source of electrical power at the end of said hollow tubular member proximate said fluid mover.