Processor card assembly including a heat sink attachment plate and an EMI/ESD shielding cage

• US 5,838,542 A
• Filed: 09/30/1996
• Issued: 11/17/1998
• Est. Priority Date: 09/30/1996
• Status: Expired due to Term

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Noval, James V., Suarez, Ricardo E., Nelson, Darul J., Aghazadeh, Mostafa A.
• Primary Examiner(s): Thompson, Gregory D.
• Application Number:
  US08/723,027
• Time in Patent Office: 778 Days
• Field of Search: 174/35 R, 174/35 GC, 235/487, 235/492, 361/704, 361/707, 361/709-710, 361/714-721, 361/737, 361/753, 361/759, 361/816, 361/818, 439/76.1
• US Class Current: 361/704
• CPC Class Codes: G06F 1/184 Mounting of motherboards
• CPC Class Codes: G06F 1/185 Mounting of expansion boards
• CPC Class Codes: G06F 1/186 Securing of expansion boards in correspondence to slots provided at the computer enclosure
• CPC Class Codes: G06F 1/20 Cooling means
• CPC Class Codes: H01L 23/4093 Snap-on arrangements, e.g. clips
• 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: H01L 2924/3011 Impedance
• CPC Class Codes: H05K 7/1431 Retention mechanisms for CPU modules
• CPC Class Codes: H05K 7/20418 the radiating structures being additional and fastened onto the housing

Abstract

The processor card assembly of the present invention includes a processor card, a metallic plate and a back cover. The processor card includes a circuit board having a processor mounted thereto. The circuit board includes a first and a second plurality of fastening features. The metallic plate has a third and a fourth plurality of fastening features. The third plurality of fastening features cooperate with the first plurality of fastening features for physically attaching and thermally coupling the processor to the metallic plate, to serve as a base for further thermally coupling the processor to a heat sink. The back cover has a fifth plurality of fastening features that cooperate with the second plurality of fastening features of the circuit board and the fourth plurality of fastening features of the metallic plate to allow the metallic plate and the back cover to physically and electro-magnetically form a Faraday cage enclosing the processor card to shield off electro-magnetic interference emissions and electrostatic discharge from the processor.

Claims

1. A processor card assembly comprising:

a processor card including a circuit board having a processor mounted thereon, the circuit board having a first and a second plurality of fastening features;

a metallic plate having a third and a fourth plurality of fastening features, the third plurality of fastening features cooperating with the first plurality of fastening features for physically attaching and thermally coupling the processor card to the metallic plate;

a back cover having a fifth plurality of fastening features that cooperate with the second plurality of fastening features of the circuit board and the fourth plurality of fastening features of the metallic plate, to allow the metallic plate and the back cover to physically and electro-magnetically enclose the processor card to reduce electro-magnetic interference emissions and/or shield electrostatic discharges from the processor; and

wherein the metallic plate further includes a sixth plurality of fastening features selectively employed to removably accept a selected one of a plurality of alternative heat sinks external to said assembly.

2. The processor card assembly as set forth in claim 1, wherein the circuit board further comprises a plurality of connecting pins disposed on a first edge for electrically connecting the processor card to a connector in a direction orthogonal to the direction the processor card and the metallic plate physically attach and thermally couple to each other.

3. The processor card assembly as set forth in claim 2, wherein the circuit board and the back cover are coordinated in height, providing physical protection to the connecting pins prior to their connection to the connector.

4. The processor card assembly as set forth in claim 1, wherein

the processor is mounted on a first face of the circuit board, and the circuit board further having a heat dissipating component mounted on a second face of the circuit board, the first and second faces being opposing faces of the circuit board;

and

the back cover is further used for thermally removing heat dissipated by the heat dissipating component.

5. The processor card assembly as set forth in claim 4, wherein the back cover includes an interior face and a thermally conductive pad, the thermally conductive pad being surface mounted on the interior face in an area that is geometrically coordinated with where the heat dissipating component is mounted on the second face of the circuit board.

6. The processor card assembly as set forth in claim 1, wherein the metallic plate further comprises a channel longitudinally spanning the metallic plate, and the sixth plurality of fastening features include a plurality of openings for strapping the heat sink to the metallic plate.

7. The processor card assembly as set forth in claim 1, wherein the processor card assembly further comprises a front cover having a hollow face for attaching to the circuit board over the metallic plate, which is exposed through the hollow face.

8. The processor card assembly as set forth in claim 7, wherein front cover further comprises a plurality of perimeter notches for facilitating strapping of the heat sink to the metallic plate.

9. The processor card assembly as set forth in claim 7, wherein

the circuit board further comprises a plurality of connecting pins disposed on a first edge for electrically connecting the processor card to a connector in a direction orthogonal to the direction the processor card and the metallic plate physically attach and thermally couple to each other;

and

the circuit board and the front cover are coordinated in height, providing physical protection to the connecting pins prior to their connection to the connector.