Heat sink interface having three-dimensional tolerance compensation

• US 8,537,552 B2
• Filed: 09/25/2009
• Issued: 09/17/2013
• Est. Priority Date: 09/25/2009
• Status: Active Grant

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Paquette, Jeffrey, Cheyne, Scott R., Ellsworth, Joseph R., Martinez, Michael P., Trahan, Michael R.
• Primary Examiner(s): THOMAS, BRADLEY H
• Application Number:
  US12/566,818
• Publication Number:
  US 20110075377A1
• Time in Patent Office: 1,453 Days
• Field of Search: 361/709, 361/710, 361/711, 361/717, 165/185
• US Class Current: 361/710
• CPC Class Codes: H05K 7/20509 Multiple-component heat spreaders; Multi-component heat-conducting support plates; Multi-component non-closed heat-conducting structures

Abstract

A thermal interface includes a plurality of elevated regions and a plurality of mechanical tolerance circuits coupled to the plurality of elevated regions. The thermal interface is configured to be disposed between an array of heat generating elements and a heat sink with each of the plurality of elevated regions thermally coupled to a corresponding one or more of the array of heat generating elements. In one embodiment, the thermal interface provides a thermal path between a printed wiring board having a plurality of flip-chip circuit components disposed on an external surface thereof and a heat sink disposed over the flip-chip circuit components.

Claims

1. A thermal interface comprising:

a frame having first and second opposing surfaces;

a plurality of elevated regions projecting above one of the first and second opposing surfaces of said frame;

a force providing element coupled to the thermal interface such that said force providing element provides a force to the elevated regions by being disposed through the elevated regions to provide the thermal interface with a warp-weave type pattern;

a plurality of mechanical tolerance circuits, each of said mechanical tolerance circuits coupled between at least one of said plurality of elevated regions and said frame.

2. The thermal interface of claim 1 wherein the plurality of elevated regions and plurality of mechanical tolerance circuits are provided as like pluralities and each of said mechanical tolerance circuits are coupled between a corresponding one of said plurality of elevated regions and said frame.

3. The thermal interface of claim 1 wherein a first one of the mechanical tolerance circuits is provided having a single generally C-shape.

4. The thermal interface of claim 1 wherein a first one of the mechanical tolerance circuits is provided having a generally S-shape.

5. The thermal interface of claim 1 wherein a first one of the mechanical tolerance circuits is provided having a generally triple C-shape.

6. The thermal interface of claim 1, further comprising a plurality of strain relieved sections comprising members having one or more C-shaped bends to accommodate movement in one direction and extending between at least some of said plurality of elevated regions.

7. The thermal interface of claim 6 wherein the plurality of strain relieved sections is provided in said frame.

8. The thermal interface of claim 6 wherein the members further comprise one or more S-shaped bends to accommodate movement in one direction.

9. A system comprising:

an array of heat generating elements;

a thermal interface comprising;

a plurality of elevated regions;

a force providing element coupled to the thermal interface such that said force providing element provides a force to the elevated regions by being disposed through the elevated regions to provide the thermal interface with a warp-weave type pattern;

a plurality of mechanical tolerance circuits coupled to the plurality of elevated regions with each of the plurality of elevated regions thermally coupled to a corresponding one or more of the array of heat generating elements; and

a heat sink coupled to said thermal interface such that said thermal interface is disposed between said array of heat generating elements and said heat sink.

10. The system of claim 9 wherein said array of heat generating elements correspond to a first plurality of flip-chip circuits disposed on a first surface of a panel array and wherein said panel array is provided having a second opposing surface and wherein said panel array further comprises a second plurality of radiating elements configured to emit and receive radio frequency (RF) signals through the second surface of said panel array.

11. The system of claim 10 wherein said thermal interface is provided having portions of a first surface in thermal contact with said plurality of flip-chip circuits and wherein said mechanical tolerance circuits is configured to accommodate mechanical tolerances in at least three orthogonal directions.

12. The system of claim 10 wherein said heat sink is provided having a surface in thermal contact with said thermal interface.

13. The system of claim 9 wherein said thermal interface further comprises a frame having first and second opposing surfaces,

wherein the plurality of elevated regions project above one of the first and second opposing surfaces of said frame and each of the plurality of mechanical tolerance circuits is coupled to said frame and to at least one of said plurality of elevated regions.

14. The system of claim 13 wherein a first one of the mechanical tolerance circuits is provided having a single substantially C-shape.

15. The system of claim 13 wherein a first one of the mechanical tolerance circuits is provided having a substantially S-shape.

16. The system of claim 13 wherein a first one of the mechanical tolerance circuits is provided having a substantially double S-shape.

17. The system of claim 9, further comprising a plurality of strain relieved sections comprising members having one or more C-shaped bends to accommodate movement in one direction and extending between at least some of said plurality of elevated regions.

18. The system of claim 17 wherein the plurality of strain relieved sections is a first one of a plurality of strain relieved sections with each of said strain relieved sections provided from at least one channel provided in said frame.

19. The system of claim 17 wherein the members further comprise one or more S-shaped bends to accommodate movement in one direction.

20. A thermal interface comprising:

a frame having first and second opposing surfaces;

a first plurality of elevated regions projecting above one of the first and second opposing surfaces of said frame;

a first plurality of mechanical tolerance circuits, each of the mechanical tolerance circuits coupled between at least one of said plurality of elevated regions and said frame; and

a second plurality of structural ribbons, each of said second plurality of structural ribbons extending from a first end to a second opposite end of said frame and each of said second plurality of structural ribbons intersecting with a single row of said elevated regions,

wherein the second plurality of structural ribbons are disposed through the elevated regions to provide the thermal interface with a warp-weave type pattern.

21. The thermal interface of claim 20 wherein a first one of said mechanical tolerance circuits is provided having at least one of a substantially C-shape;

a generally S-shape; and

a generally triple C-shape.

22. The thermal interface of claim 20 wherein each of said second plurality of structural ribbons is provided having a width which is narrower than a width of the elevated regions.