Heat Sink Interface Having Three-Dimensional Tolerance Compensation

• US 20110075377A1
• Filed: 09/25/2009
• Published: 03/31/2011
• Est. Priority Date: 09/25/2009
• Status: Active Grant

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Cheyne, Scott R., Martinez, Michael P., Trahan, Michael R., Ellsworth, Joseph R., Paquette, Jeffrey
• Granted Patent: US 8,537,552 B2
• Time in Patent Office: Days
• US Class Current: 361/709
• 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; and

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.

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 force providing element coupled to the heat sink interface such that said force providing element provides a force to the elevated regions.

7. The thermal interface of claim 1 wherein said frame comprises an strain relieved section between at least some of said plurality of elevated regions.

8. The thermal interface of claim 1 wherein said strain relieved section is provided having a generally C-shaped cross section.

9. The thermal interface of claim 1 wherein said strain relieved section is provided in said frame.

2. The thermal interface of claim 2 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.

10. A system comprising:

an array of heat generating elements;

a thermal interface including a plurality of elevated regions and 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.

11. The system of claim 10 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.

12. The system of claim 11 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 circuit is configured to accommodate mechanical tolerances in at least three orthogonal directions.

13. The system of claim 11 wherein said heat sink is provided having a surface in thermal contact with said thermal interface circuit.

14. The system of claim 10 wherein said thermal interface comprises:

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; and

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

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

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

17. The system of claim 14 wherein a first one of the mechanical tolerance circuits is provided having a substantially double S-shape.

18. The system of claim 14 further comprising a force providing element coupled to said the thermal interface such that said force providing element provides a force to the elevated regions.

19. The system of claim 14 comprising an strain relieved section having one of a substantially C-shape or a substantially triple C-shape.

20. The system of claim 14 wherein said strain relieved section 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.

21. 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.

22. The thermal interface of claim 21 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.

23. The thermal interface of claim 21 wherein each of said second plurality of structural ribbons is provided having a width which is narrower than a width of the elevated regions.