Chassis shielding system

• US 6,608,758 B1
• Filed: 09/07/2000
• Issued: 08/19/2003
• Est. Priority Date: 09/07/2000
• Status: Expired due to Term

• Current Assignee: Google LLC (Alphabet Inc.), Mellanox Technologies Limited (NVIDIA Corporation)
• Original Assignee: International Business Machines Corporation
• Inventors: Hunt, Daniel Joseph, Doman, Joseph Francis Xavier, Owsley, William Drummond, Dials, Edward N.
• Primary Examiner(s): Martin, David
• Assistant Examiner(s): Lindinger, Michael L.
• Application Number:
  US09/657,865
• Time in Patent Office: 1,076 Days
• Field of Search: 174/35.GC, 174/35.C, 174/35.R, 361/752, 361/753, 361/759, 361/800, 361/801, 361/802, 361/816, 361/818, 361/825, 361/796, 361/799, 361/743, 361/413, 361/424
• US Class Current: 361/753
• CPC Class Codes: G06F 1/182 with special features, e.g. for use in industrial environments; grounding or shielding against radio frequency interference [RFI] or electromagnetical interference [EMI]
• CPC Class Codes: H05K 9/0018 with provisions to reduce aperture leakages in walls, e.g. terminals, connectors, cables

Abstract

A computer chassis in accordance with the present invention is disclosed. The chassis includes a first body, a second body, and an electromagnetic shield coupled between the first body and the second body. The shield includes a plurality of dimples and a plurality of valleys for providing an electromechanical seal when the shield is placed in an interference condition. The chassis shielding system utilizes a shield with a design that is inexpensive to manufacture, is structurally sturdy, and simple to implement in an interference environment. In a preferred embodiment, the shield is provided for inserting between a circuit card mounting bracket and a computer chassis. The improved shield design incorporates special features including a plurality of dimples and a plurality of valleys, strategically located for providing improved adjacent surface contact and enhanced shielding from unwanted radiation.

Claims

1. A chassis shielding system comprising:

a first body;

a second body; and

a shield coupled between the first body and the second body, wherein the shield includes a plurality of circular indentations and a plurality of valleys, wherein the plurality of valleys comprise folds in the shield, wherein the plurality of circular indentations contact the first body and the plurality of valleys contact the second body for providing an electromechanical seal when the shield is placed in an interference environment.

2. The chassis shielding system of claim 1 wherein the first body comprises a computer chassis.

3. The chassis shielding system of claim 1 wherein the second body comprises a circuit card bracket.

4. The chassis shielding system of claim 1 wherein the second body comprises a peripheral component interconnect (“

PCI”

) adapter card having an attached mounting bracket for coupling the PCI adapter card to the chassis.

5. The chassis shielding system of claim 1 wherein the plurality of circular indentations and the plurality of valleys protrude in opposite directions away from the surface of the shield.

6. The chassis system of claim 1 wherein the shield has at least one arm, the arm having located thereon the plurality of circular indentations and the plurality of valleys.

7. An electromechanical shield comprising:

an electrically conductive plate;

a plurality of circular indentations;

a plurality of valleys located proximately to the circular indentations, the valleys and circular indentations located on the conductive plate being capable of providing an electromechanical seal, wherein the plurality of valleys comprises folds in the electrically conductive plate, wherein the plurality of circular indentations is configured to contact a first body and the plurality of valleys is configured to contact a second body when the electromechanical shield is coupled between the first body and the second body.

8. A system of controlling electromagnetic radiation comprising:

a chassis;

a second body; and

a shield coupled between the chassis and the second body, the shield having a plurality of circular indentations and a plurality of valleys located thereon, wherein the plurality of valleys comprises folds in the shield, wherein the plurality of circular indentations contacts the second body and the plurality of valleys contacts the chassis, such that an electromechanical seal is formed to reduce unwanted radiation emissions.

9. A chassis shielding system comprising:

a computer chassis;

a peripheral component interconnect (“

PCI”

) adapter card, the adapter card including a mounting bracket for coupling the adapter card to the computer chassis; and

a shield coupled between the computer chassis and the PCI adapter card, wherein the shield has at least one arm, the arm having located thereon a plurality of circular indentations and a plurality of valleys, wherein the plurality of circular indentations and the plurality of valleys protrude in opposite directions away from the surface of the shield, wherein the plurality of valleys comprises folds in the shield, wherein the plurality of circular indentations contact the mounting bracket and the plurality of valleys contact the computer chassis for providing an electromechanical seal when the shield is placed in an interference environment.

10. A chassis shielding system comprising:

a first body;

a second body; and

a shield coupled between the first body and the second body, wherein the shield includes a plurality of circular indentations and a plurality of valleys protruding in opposite directions away from a surface of the shield, wherein the plurality of circular indentations contact the first body and the plurality of valleys contact the second body, wherein the contact between the plurality of circular indentations and the first body and the contact between the plurality of valleys and the second body provide an electromechanical seal when the shield is placed in an interference environment.

11. An electromechanical shield comprising:

an electrically conductive plate;

a plurality of circular indentations;

a plurality of valleys located proximately to the circular indentations, wherein the plurality of circular indentations and the plurality of valleys protrude in opposite directions away from a surface of the conductive plate, wherein the plurality of circular indentations is configured to contact a first body and the plurality of valleys is configured to contact a second body when the electromechanical shield is coupled between the first body and the second body, wherein the contact between the plurality of circular indentations and the first body and the contact between the plurality of valleys and the second body provide an electromechanical seal.

12. A system of controlling electromagnetic radiation comprising:

a chassis;

a second body; and

a shield coupled between the chassis and the second body, wherein the shield comprises a plurality of circular indentations and a plurality of valleys protruding in opposite directions away from a surface of the shield, wherein the plurality of circular indentations contacts the second body and the plurality of valleys contacts the chassis, wherein the contact between the plurality of circular indentations and the second body and the contact between the plurality of valleys and the chassis provide an electromechanical seal to reduce unwanted radiation emissions.

13. A chassis shielding system comprising:

a computer chassis;

a peripheral component interconnect (“

PCI”

) adapter card, the adapter card including a mounting bracket for coupling the adapter card to the computer chassis; and

a shield coupled between the computer chassis and the PCI adapter card, wherein the shield has at least one arm, the arm having located thereon a plurality of circular indentations and a plurality of valleys, wherein the plurality of circular indentations and the plurality of valleys protrude in opposite directions away from the surface of the shield, wherein the plurality of circular indentations contact the mounting bracket and the plurality of valleys contact the computer chassis, wherein the contact between the plurality of circular indentations and the mounting bracket and the contact between the plurality of valleys and the computer chassis provide an electromechanical seal when the shield is placed in an interference environment.