LED searchlight and method

• US 10,180,246 B2
• Filed: 10/31/2016
• Issued: 01/15/2019
• Est. Priority Date: 10/31/2016
• Status: Active Grant

• Current Assignee: Honeywell (Honeywell International Inc.)
• Original Assignee: Honeywell International Inc.
• Inventors: Giffen, Craig
• Primary Examiner(s): Gyllstrom, Bryon T
• Application Number:
  US15/339,134
• Publication Number:
  US 20180119938A1
• Time in Patent Office: 806 Days
• Field of Search: 362235
• CPC Class Codes: B60Q 1/245 Searchlights, e.g. adjustable from within the vehicle adjustable headlights B60Q1/06
• CPC Class Codes: B64D 2203/00 Aircraft or airfield lights using LEDs
• CPC Class Codes: B64D 47/02 Arrangements or adaptations of signal or lighting devices
• CPC Class Codes: F21S 8/003 Searchlights, i.e. outdoor lighting device producing powerful beam of parallel rays, e.g. for military or attraction purposes searchlights mounted on a vehicle B60Q1/245
• 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 29/508 of electrical circuits
• 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 29/717 using split or remote units thermally interconnected, e.g. by thermally conductive bars or heat pipes
• 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 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21W 2131/406 for theatres, stages or film studios

Abstract

A searchlight assembly has a first housing portion and a second housing portion, wherein each of the first housing portion and the second housing portion has operably secured to form an enclosed space: a heat sink, a reflector and a lens. The first housing portion and the second housing portion being are joined to form a housing assembly. The first housing portion heat sink and the second housing portion heat sink are disposed adjacent to one another and form a cooling medium flow path there between, and the heat sink elements of each heat sink thermally communicate with the flow path. A first LED is directly thermally coupled to the heat sink within in the first housing portion enclosed space and a second LED is directly thermally coupled to the heat sink within the second housing portion enclosed space.

Claims

1. A searchlight comprising:

a first housing portion and a second housing portion, each of the first housing portion and the second housing portion comprising operably secured to form a reflector cavity;

a heat sink, a reflector and a lens;

the first housing portion and the second housing portion being joined to form a housing assembly, wherein the first housing portion heat sink and the second housing portion heat sink are disposed adjacent to one another and form a cooling medium flow path there between, such that heat sink elements of each heat sink thermally communicate with the flow path; and

a first LED device directly thermally coupled to the heat sink within the first housing portion reflector cavity and a second LED device directly thermally coupled to the heat sink within the second housing portion reflector cavity;

wherein a circuit/wiring block is disposed within the heat sink defined cooling medium flow path and mechanically joins the first housing portion heat sink and the second housing portion heat sink.

2. The searchlight of claim 1, wherein the heat sink elements extend into the flow path.

3. The searchlight of claim 1, wherein the circuit/wiring block is disposed between the first housing portion heat sink and the second housing portion heat sink within respective recesses formed in the first housing portion heat sink and the second housing portion heat sink.

4. The searchlight of claim 1, wherein the circuit/wiring block comprises an LED driver circuit and an electrical connector.

5. The searchlight of claim 1, comprising a third housing portion joining the first housing portion and the second housing portion.

6. The searchlight of claim 5, wherein the third housing portion comprises operably secured to form a third reflector cavity:

a heat sink, a reflector and a lens, and a third LED device, wherein the third LED device is disposed within third reflector cavity.

7. The searchlight of claim 6, wherein the third LED device emits light in the infrared spectrum.

8. The searchlight of claim 1, wherein the first LED device emits light in the visible spectrum.

9. The searchlight of claim 1, wherein the second LED device emits light in the visible spectrum.

10. The searchlight of claim 1, wherein the reflectors are thermally conductive.

11. The searchlight of claim 1, wherein the first LED device is secured to a reflective surface of the heat sink.

12. The searchlight of claim 1, wherein the second LED device is secured to a reflective surface of the heat sink.

13. In a searchlight having a first housing portion and a second housing portion, each of the first housing portion and the second housing portion comprising operably secured to form a reflector cavity:

a heat sink, a reflector and a lens, a method of cooling the searchlight comprising;

mechanically securing together using a circuit/wiring block a first heat sink portion of the first housing portion and a second heat sink portion of the second housing portion to define a heat sink cooling medium flow path between the first heat sink portion and the second heat sink portion, the circuit/wiring block being disposed within the heat sink cooling medium flow path; and

securing an LED device to the heat sink within each of respective reflector cavities.

14. The method of claim 13, wherein securing an LED device to the heat sink within each of respective reflector cavities comprises securing the LED device to a reflective surface of the heat sink.

15. The method of claim 13, wherein arranging the heat sinks to form a cooling medium flow path there between comprises providing the heat sinks with heat sink elements and disposing the heat sink elements within the flow path.

16. The method of claim 13, wherein arranging the heat sinks to form a cooling medium flow path there between comprises providing a circuit/wiring block disposed between the heat sinks and securing the heat sinks to the circuit/wiring block.

17. The method of claim 16, wherein providing a circuit/wiring block disposed between the heat sinks comprises disposing the circuit/wiring block within the flow path.

18. The method of claim 13, wherein arranging the heat sinks to form a cooling medium flow path there between comprises providing a third housing portion and securing the first housing portion and the second housing portion to the third housing portion.