Flexible thermal conduit for an electronic device

• US 9,986,667 B2
• Filed: 12/14/2016
• Issued: 05/29/2018
• Est. Priority Date: 01/20/2015
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Inventors: Nikkhoo, Michael, Heirich, Doug, Riccomini, Roy, Ye, Maosheng, Beerman, Michael, Taylor, Joseph Daniel
• Primary Examiner(s): HOFFBERG, ROBERT JOSEPH
• Application Number:
  US15/379,425
• Publication Number:
  US 20170099749A1
• Time in Patent Office: 531 Days
• CPC Class Codes: F28D 15/00 Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies F28D17/00, F28D19/00, F28D20/00 take precedence
• CPC Class Codes: F28D 15/02 in which the medium condenses and evaporates, e.g. heat pipes heat pipes used in solar heat collectors F24S10/95; in radiators F28D1/0226; in nuclear reactors G21C15/257
• CPC Class Codes: F28D 15/0241 the tubes being flexible
• CPC Class Codes: F28F 21/00 Constructions of heat-exchange apparatus characterised by the selection of particular materials coatings for modifying heat-transfer F28F13/18; coatings for preventing the formation of deposits or corrosion F28F19/02
• CPC Class Codes: F28F 21/02 of carbon, e.g. graphite
• CPC Class Codes: F28F 21/08 of metal
• CPC Class Codes: F28F 21/085 from copper or copper alloys
• CPC Class Codes: F28F 2255/02 Flexible elements
• CPC Class Codes: F28F 3/02 Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations F28F3/08 takes precedence
• CPC Class Codes: F28F 3/08 Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning
• CPC Class Codes: G02B 2027/0178 Eyeglass type eyeglass details G02C
• CPC Class Codes: G02B 27/0176 characterised by mechanical features
• CPC Class Codes: G06F 1/163 Wearable computers, e.g. on a belt
• CPC Class Codes: G06F 1/1681 Details related solely to hinges hinge details related to the transmission of signals or power are classified in G06F1/1683
• CPC Class Codes: G06F 1/203 for portable computers, e.g. for laptops
• CPC Class Codes: G06F 3/011 Arrangements for interaction with the human body, e.g. for user immersion in virtual reality blind teaching G09B21/00
• CPC Class Codes: H01L 2023/4068 Heatconductors between device and heatsink, e.g. compliant heat-spreaders, heat-conducting bands
• CPC Class Codes: H01L 23/3733 having a heterogeneous or anisotropic structure, e.g. powder or fibres in a matrix, wire mesh, porous structures H01L23/3732, H01L23/3737 take precedence
• CPC Class Codes: H01L 23/3735 Laminates or multilayers, e.g. direct bond copper ceramic substrates
• CPC Class Codes: H01L 23/3736 Metallic materials H01L23/3732, H01L23/3733, H01L23/3735, H01L23/3737, H01L23/3738 take precedence
• CPC Class Codes: H05K 1/0201 : Thermal arrangements, e.g. for cooling, heating or preventing overheating
• CPC Class Codes: H05K 5/0226 : Hinges
• CPC Class Codes: H05K 7/20127 : Natural convection
• CPC Class Codes: H05K 7/2039 : characterised by the heat transfer by conduction from the heat generating element to a dissipating body arrangements for increasing/decreasing heat-transfer, e.g. fins details, F28F13/00
• CPC Class Codes: H05K 7/20409 : Outer radiating structures on heat dissipating housings, e.g. fins integrated with the housing
• CPC Class Codes: H05K 7/20454 : with a conformable or flexible structure compensating for irregularities, e.g. cushion bags, thermal paste
• CPC Class Codes: H05K 7/20963 : Heat transfer by conduction from internal heat source to heat radiating structure H05K7/20972 takes precedence

Abstract

A flexible thermal conduit runs from a first housing portion of an electronic device to a second housing portion of the electronic device, to convey heat generated by an electronic component located in the first housing portion to a heat dissipation structure located in the second housing portion, where the second housing portion is flexibly coupled to the first housing portion, for example, by a hinge or other type of joint. The flexible conduit may include a plurality of layers of thin, flat thermally conductive material, which may be arranged to flex independently of each other in the region where the first and second housing portions are coupled.

Claims

1. A head-mounted display device comprising:

a visor assembly including a display assembly to cause an image to be displayed to a user, the visor assembly including an electronic component that generates heat during operation;

a head fitting assembly, flexibly coupled to the visor assembly, by which the head-mounted display device can be worn on a head of the user, the head fitting assembly including a heat dissipation structure; and

a multi-layer flexible thermal conduit that passes from the visor assembly to the head fitting assembly via a region where the head fitting assembly is flexibly coupled to the visor assembly, to convey heat generated by the electronic component to the heat dissipation structure in the head fitting assembly, the multi-layer flexible thermal conduit including a plurality of stacked, flexible, thermally conductive layers, a surface of each layer of the plurality of stacked, flexible, thermally conductive layers being adjacent to a surface of another layer of the plurality of stacked, flexible, thermally conductive layers.

2. An electronic device as recited in claim 1, wherein the head fitting assembly is coupled to the visor assembly via a hinge.

3. An electronic device as recited in claim 1, wherein the plurality of stacked, flexible, thermally conductive layers are affixed to each other in a first region and in a second region but are not affixed to each other in a central region between the first region and the second region, the central region being adjacent to the region where the head fitting assembly is flexibly coupled to the visor assembly.

4. A head-mounted display device as recited in claim 1, wherein the plurality of stacked, flexible thermally conductive layers comprise a plurality of layers of flexible graphite.

5. A head-mounted display device as recited in claim 1, wherein the plurality of flexible thermally conductive layers comprise a plurality of layers of metal.

6. A head-mounted display device comprising:

a visor assembly containing a plurality of electronic components that generate heat when in operation, the visor assembly including a display component to display an image directly in front of an eye of a user;

a head fitting assembly, coupled to the visor assembly, by which the head-mounted display device can be worn on a head of the user, the head fitting assembly including a plurality of curved, elongate side arms, each flexibly coupled to a different end of the visor assembly, each of said side arms including a heat dissipation structure; and

a plurality of multi-layer flexible thermal conduits, a first one of the multi-layer flexible thermal conduits which is coupled to the visor assembly and to a first one of the side arms and a second one of the multi-layer flexible thermal conduits which is coupled to the visor assembly and to a second one of the side arms, each of said multi-layer flexible thermal conduits configured to convey heat generated by at least one of the plurality of electronic components to the heat dissipation structure in a corresponding one of the side arms, each of said multi-layer flexible thermal conduits including a plurality of flat, elongate, flexible thermal conduit strips, wherein each of said multi-layer flexible thermal conduits includes a plurality of stacked, flexible, thermal conductive strips, a surface of each strip of the plurality of stacked, flexible, thermally conductive strips being adjacent to a surface of another strip of the plurality of stacked, flexible, thermally conductive strips.

7. An electronic device as recited in claim 6, wherein the head fitting assembly is coupled to the visor assembly via a plurality of hinges, each of said hinges coupling the visor assembly to a separate one of the side arms.

8. An electronic device as recited in claim 6, wherein in each of said multi-layer flexible thermal conduits, the plurality of stacked, flexible, thermally conductive layers are affixed to each other in a first region and in a second region but are not affixed to each other in a central region between the first region and the second region, the central region being adjacent to a region where a corresponding one of said multi-layer flexible thermal conduits is flexibly coupled to the visor assembly.

9. A head-mounted display device as recited in claim 6, wherein the plurality of flat, elongate, flexible thermally conduit strips comprise a plurality of layers of flexible graphite.

10. A head-mounted display device as recited in claim 6, wherein the plurality of flat, elongate, flexible thermally conduit strips comprise a plurality of layers of metal.

11. A head-mounted display device as recited in claim 6, further comprising a first thermally conductive bracket coupled to at least one of the electronic components and to a one of the flexible thermal conduits associated with one of the side arms.

12. A head-mounted display device as recited in claim 11, wherein the first thermally conductive bracket secures together the plurality of flat, elongate, flexible thermal conduit strips of said one of the flexible thermal conduits.

13. A head-mounted display device as recited in claim 11, further comprising a circuit board mounted to an interior surface of the visor assembly, the circuit board having at least some of the plurality of electronic components disposed thereon, wherein the first thermally conductive bracket is coupled to the circuit board.

14. A head-mounted display device as recited in claim 13, further comprising a heat spreader held to the circuit board by the first thermally conductive bracket.

15. A head-mounted display device as recited in claim 14, further comprising a clamp disposed proximate to the corresponding one of the plurality of hinges associated with said one of the side arms, wherein the clamp secures together the plurality of flat, elongate, flexible thermal conduit strips of said one of the flexible thermal conduits.