Thermal interface members for removable electronic devices

• US 8,223,498 B2
• Filed: 11/11/2009
• Issued: 07/17/2012
• Est. Priority Date: 11/11/2009
• Status: Expired due to Fees

• Current Assignee: Juniper Networks Incorporated
• Original Assignee: Juniper Networks Incorporated
• Inventors: Lima, David J.
• Primary Examiner(s): Vortman, Anatoly
• Application Number:
  US12/616,497
• Publication Number:
  US 20110110048A1
• Time in Patent Office: 979 Days
• Field of Search: 361/704, 361/707, 361/709, 361/710, 361/714, 361/715, 361/720, 385/92, 372/36, 353/57, 362/294, 362/345, 362/373, 362/580, 362/547, 362/218, 362/264, 398/117, 398/164
• US Class Current: 361/720
• CPC Class Codes: H05K 1/0204 using means for thermal conduction connection in the thickness direction of the substrate H05K1/0207 takes precedence
• CPC Class Codes: H05K 1/0206 by printed thermal vias
• CPC Class Codes: H05K 1/0209 External configuration of printed circuit board adapted for heat dissipation, e.g. lay-out of conductors, coatings
• CPC Class Codes: H05K 2201/0162 Silicon containing polymer, e.g. silicone
• CPC Class Codes: H05K 7/20418 the radiating structures being additional and fastened onto the housing
• CPC Class Codes: H05K 7/205 Heat-dissipating body thermally connected to heat generating element via thermal paths through printed circuit board [PCB] details of PCBs relating to heat transfer H05K1/0201
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing

Abstract

In some embodiments, an apparatus includes a printed circuit board and a thermal interface member. The printed circuit board is configured to be coupled to an electronic device, such as, for example, a removable (or “pluggable”) optical transceiver. A first surface of the printed circuit board includes a thermally-conductive portion, and a second surface of the printed circuit board includes a thermally-conductive portion that is coupled to the thermally-conductive portion of the first surface by a thermally-conductive via between the first surface and the second surface. The thermal interface member is coupled to the first surface of the printed circuit board such that a portion of the thermal interface member is in contact with the thermally-conductive portion of the first surface. The portion of thermal interface member is deformable and thermally-conductive.

Claims

1. An apparatus, comprising:

a printed circuit board configured to be coupled to an electronic device, a first surface of the printed circuit board including a thermally-conductive portion, a second surface of the printed circuit board including a thermally-conductive portion that is coupled to the thermally-conductive portion of the first surface by a thermally-conductive via between the first surface and the second surface; and

a thermal interface member coupled to the first surface of the printed circuit board such that a portion of the thermal interface member is in contact with the thermally-conductive portion of the first surface, the portion of the thermal interface member being deformable and thermally-conductive,

the thermal interface member having a first layer and a second layer, the first layer being tear-resistant and thermally-conductive, the second layer disposed between the first layer and the first surface of the printed circuit board, the second layer including at least one of a thermally-conductive gel, a thermally-conductive grease or a phase-change material having a phase-change temperature threshold of approximately 40 degrees Celsius.

2. The apparatus of claim 1, wherein:

the second layer includes a first region and a second region, the first region including a first material that is deformable and thermally-conductive, the second region including a second material that is an adhesive.

3. The apparatus of claim 1, wherein an outer surface of the thermal interface member is configured to be in sliding contact with the electronic device.

4. The apparatus of claim 1, wherein an outer surface of the thermal interface member is configured to contact the electronic device when the electronic device is coupled to the printed circuit board, the outer surface of the thermal interface member is formed from a material having a static coefficient of friction less than approximately 0.5.

5. The apparatus of claim 1, wherein an outer surface of the thermal interface member is configured to contact the electronic device when the electronic device is coupled to the printed circuit board, the outer surface of the thermal interface member is formed from a material having a thermal conductivity of at least approximately 0.07 W/m-K and a Graves tear resistance value of at least one pound.

6. The apparatus of claim 1, wherein the first surface of the printed circuit board defines a recess, a portion of the thermal interface member being disposed within the recess.

7. The apparatus of claim 1, further comprising:

a frame coupled to the first surface of the printed circuit board, the frame defining, at least in part, an internal volume within which at least a portion of the electronic device can be disposed when the electronic device is coupled to the printed circuit board,

the frame defining an opening within which a portion of the thermal interface member is disposed such that the portion of the thermal interface member is in slidable contact with the electronic device.

8. The apparatus of claim 1, wherein the portion of the second surface of the printed circuit board includes at least one of a recess or a protrusion configured to induce turbulence in an airflow adjacent the second surface.

9. The apparatus of claim 1, wherein the portion of the first surface of the printed circuit board and the portion of the second surface of the printed circuit board are devoid of a solder mask.

10. An apparatus, comprising:

a printed circuit board configured to be coupled to an electronic device;

a frame coupled to a first surface of the printed circuit board, the frame defining, at least in part, an internal volume within which at least a portion of the electronic device can be disposed when the electronic device is removably coupled to the printed circuit board, the frame defining an opening; and

a thermal interface member coupled to the first surface of the printed circuit board such that a portion of the thermal interface member is disposed within the opening, the thermal interface member being in contact with the electronic device when the portion of the electronic device is disposed within the internal volume,

the thermal interface member having a first layer and a second layer, the first layer being tear-resistant and thermally-conductive, the second layer disposed between the first layer and the first surface of the printed circuit board, the second layer including at least one of a thermally-conductive gel, a thermally-conductive grease or a phase-change material having a phase-change temperature threshold of approximately 40 degrees Celsius.

11. The apparatus of claim 10, wherein an outer surface of the thermal interface member is configured to contact the electronic device when the portion of the electronic device is disposed within the internal volume, the outer surface of the thermal interface member is formed from a material having a static coefficient of friction less than approximately 0.5.

12. The apparatus of claim 10, wherein the first surface of the printed circuit board defines a recess, a portion of the thermal interface member being disposed within the recess.

13. The apparatus of claim 10, wherein:

the thermal interface member is coupled to a thermally-conductive portion of the first surface of the printed circuit board, a second surface of the printed circuit board including a thermally-conductive portion that is coupled to the thermally-conductive portion of the first surface by a thermally-conductive via between the first surface and the second surface,

the thermally-conductive portion of the second surface including at least one of a recess or a protrusion configured to induce turbulence in an airflow adjacent the second surface of the printed circuit board.

14. A method, comprising:

disposing a first portion of a thermal interface member against a thermally-conductive portion of a first surface of a printed circuit board;

coupling a second portion of the thermal interface member to the first surface of the printed circuit board via an adhesive, the first portion of the thermal interface member being mutually exclusive from the second portion of the thermal interface member, the printed circuit board including a second surface having a thermally-conductive portion that is coupled to the thermally-conductive portion of the first surface by a thermally-conductive via between the first surface and the second surface; and

coupling a frame to the first surface of the printed circuit board such that a portion of the thermal interface member is disposed within an opening defined by the frame, the frame defining, at least in part, an internal volume within which at least a portion of an electronic device can be disposed.

15. The method of claim 14, wherein the coupling the second portion of the thermal interface member includes disposing a portion of the thermal interface member within a recess defined by the first surface of the printed circuit board.

16. The method of claim 14, wherein the coupling the second portion of the thermal interface member is performed such that an outer surface of the thermal interface member is in sliding contact with the electronic device when the portion of the electronic device is disposed within the internal volume, the outer surface of the thermal interface member is formed from a material having a static coefficient of friction less than approximately 0.5.

17. The method of claim 14, wherein the coupling the second portion of the thermal interface member is performed such that an outer surface of the thermal interface member is in sliding contact with the electronic device when the portion of the electronic device is disposed within the internal volume, the outer surface of the thermal interface member is formed from a material having a thermal conductivity of at least approximately 0.07 W/m-K and a Graves tear resistance value of at least one pound.

18. An apparatus, comprising:

a printed circuit board configured to be coupled to an electronic device, a first surface of the printed circuit board including a thermally-conductive portion, a second surface of the printed circuit board including a thermally-conductive portion that is coupled to the thermally-conductive portion of the first surface by a thermally-conductive via between the first surface and the second surface;

a thermal interface member coupled to the first surface of the printed circuit board such that a portion of the thermal interface member is in contact with the thermally-conductive portion of the first surface, the portion of the thermal interface member being deformable and thermally-conductive; and

a frame coupled to the first surface of the printed circuit board, the frame defining, at least in part, an internal volume within which at least a portion of the electronic device can be disposed when the electronic device is coupled to the printed circuit board,

the frame defining an opening within which a portion of the thermal interface member is disposed such that the portion of the thermal interface member is in slidable contact with the electronic device.