Heatsink grounding spring and shield apparatus

• US 6,278,615 B1
• Filed: 06/30/1999
• Issued: 08/21/2001
• Est. Priority Date: 06/30/1999
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Massey, Daniel Edward, Corbin, John Saunders Jr., Brezina, Johnny Roy
• Primary Examiner(s): Gandhi, Jayprakash N.
• Application Number:
  US09/343,452
• Time in Patent Office: 783 Days
• Field of Search: 361/688, 361/703, 361/704, 361/709, 361/717, 361/799, 361/800, 361/801, 361/809, 361/816, 361/818, 174/16.3, 174/35.R, 174/51, 245/63
• US Class Current: 361/799
• CPC Class Codes: H01L 23/433 Auxiliary members in containers characterised by their shape, e.g. pistons
• CPC Class Codes: H01L 23/552 Protection against radiation, e.g. light or electromagnetic waves
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H05K 9/0039 Galvanic coupling of ground layer on printed circuit board [PCB] to conductive casing printed shielding conductors, ground planes or power planes for reduction of cross-talk or noise in printed circuits H05K1/0218
• CPC Class Codes: Y10T 24/44923 Clasp, clip, or support-clamp cut or shaped from a single sheet of resilient, uniformly thick, planar material

Abstract

A heatsink grounding mechanism and an associated circuit card and computer system. The circuit card includes a printed circuit board to an integrated circuit module is attached. A heatsink is positioned in contact with or in close proximity to the integrated circuit module package. A heatsink grounding piece of the grounding mechanism is utilized to ground the heatsink. The grounding piece includes a substantially rectangular and conductive grounding piece ring that defines an aperture. The dimensions are suitable for receiving and circumventing the integrated circuit module. The grounding piece includes a set of semi-rigid conductive spring arms that extend away from the grounding piece ring. The spring arms are positioned and oriented such that termination points of the spring arms contact grounding pads on the printed circuit board when the grounding piece is compressed between the heatsink and the circuit board. The force of the spring arms against the circuit board maintains the grounding piece ring in electrical contact with the heat sink and the termination points of the spring arms in electrical contact with the grounding plates.

Claims

1. A circuit card comprising:

a printed circuit board;

an integrated circuit module attached to the printed circuit board;

a heatsink in close proximity with a package of the module; and

a grounding piece, wherein the grounding piece includes a substantially rectangular and conductive grounding piece ring defining an aperture dimensioned for receiving the integrated circuit module, and wherein the grounding piece includes a set of semi-rigid conductive spring arms extending away from the grounding piece ring at an angle of less than approximately 60° and

positioned and oriented wherein termination points of the arms contact grounding pads on the printed circuit board, wherein the force of the spring arms against the printed circuit board maintains the grounding piece ring in electrical contact with the heat sink and the termination points of the spring arms in electrical contact with the grounding plates.

2. The circuit card of claim 1, wherein the grounding piece is comprised of steel.

3. The circuit card of claim 1, wherein the grounding piece ring further defines a set of fastener holes suitable for receiving a corresponding set of fasteners, wherein the grounding piece fastener holes align with corresponding holes in the heatsink.

4. The circuit card of claim 1, further comprising a shielding piece comprising a substantially rectangular shielding piece ring defining a shielding piece aperture dimensioned for receiving the integrated circuit module, wherein the shielding piece further includes a set of shielding piece walls extending substantially perpendicularly from the shielding piece ring, wherein the walls are positioned to substantially enclose the spring arms of the grounding piece when the shielding piece ring is positioned intermediate between the grounding piece ring and the heatsink.

5. The circuit card of claim 4, wherein the shielding piece is comprised of steel.

6. The circuit card of claim 4, wherein the shielding piece ring further defines a set of aperture holes suitable for receiving a corresponding set of fasteners, wherein the fasteners maintain the heat sink in close proximity to the module.

7. The circuit card of claim 1, wherein the heatsink comprises a conductive slab from which a plurality of conductive fins extend substantially perpendicularly.

8. A heatsink grounding mechanism, comprising:

a grounding piece, wherein the grounding piece includes a substantially rectangular and conductive grounding piece ring defining an aperture dimensioned for receiving an integrated circuit module, and wherein the grounding piece includes a set of semi-rigid conductive spring arms extending away from the grounding piece ring at an angle of less than approximately 60°

, and further wherein the springs arms are positioned and oriented to terminate in contact with grounding pads on a printed circuit board when the module is received within the aperture and attached to the printed circuit board and a heatsink is in close proximity to the module package, wherein the force of the spring arms against the printed circuit board maintains the shielding piece ring in electrical contact with the heat sink and the termination points of the spring arms in electrical contact with the grounding plates.

9. The heatsink grounding mechanism of claim 8, wherein the conductive material comprises steel.

10. The heatsink grounding mechanism of claim 8, wherein the spring arms are integrally formed with the grounding piece ring.

11. The heatsink grounding mechanism of claim 8, wherein the grounding piece ring further defines a set of fastener holes suitable for receiving a corresponding set of fastener, wherein the grounding piece fastener holes align with corresponding holes in the heatsink.

12. The heatsink grounding mechanism of claim 8, further comprising a shielding piece comprising a substantially rectangular shielding piece ring defining a shielding piece aperture dimensioned for receiving the integrated circuit module, wherein the shielding piece further includes a set of shielding piece walls extending substantially perpendicularly from the shielding piece ring, wherein the walls are positioned to substantially enclose the spring arms of the grounding piece when the shielding piece ring is positioned intermediate between the grounding piece ring and the heatsink.

13. The heatsink grounding mechanism of claim 12, wherein the shielding piece is comprised of steel.

14. The heatsink grounding mechanism of claim 12, wherein the shielding piece further defines a set of aperture holes suitable for receiving a corresponding set of fasteners, wherein the fasteners maintain the heat sink in close proximity to the module.

15. A computer system comprising:

a chassis;

a power supply housed within the chassis; and

a circuit card received within the chassis of the computer system and powered by the power supply, wherein the circuit card includes;

a printed circuit board;

an integrated circuit module attached to a first face of the printed circuit board;

a heatsink in close proximity with a package of the module; and

a grounding piece, wherein the grounding piece includes a substantially rectangular and conductive grounding piece ring defining an aperture dimensioned for receiving the integrated circuit module, and wherein the grounding piece includes a set of semi-rigid conductive spring arms extending away from the grounding piece ring at an angle of less than approximately 60° and

positioned and oriented wherein termination points of the arms contact grounding pads on the printed circuit board, wherein the force of the spring arms against the printed circuit board maintains the grounding piece ring in electrical contact with the heat sink and the termination points of the spring arms in electrical contact with the grounding plates.

16. The system of claim 15, wherein the spring arms are integrally formed with the grounding piece ring.

17. The system of claim 15, wherein the grounding piece ring further defines a set of fastener holes suitable for receiving a corresponding set of fastener, wherein the grounding piece fastener holes align with corresponding holes in the heatsink.

18. The system of claim 15, further comprising a shielding piece comprising a substantially rectangular shielding piece ring defining a shielding piece aperture dimensioned for receiving the integrated circuit module, wherein the shielding piece further includes a set of shielding piece walls extending substantially perpendicularly from the shielding piece ring, wherein the walls are positioned to substantially enclose the spring arms of the grounding piece when the shielding piece ring is positioned intermediate between the grounding piece ring and the heatsink.

19. The system of claim 18, wherein the shielding piece ring further defines a set of aperture holes suitable for receiving a corresponding set of fasteners, wherein the fasteners maintain the heat sink in close proximity to the module.

20. The system of claim 18, wherein the heatsink comprises a conductive slab from which a plurality of conductive fins extend substantially perpendicularly.