EMI cable passthrough shield

• US 6,469,244 B1
• Filed: 06/27/2000
• Issued: 10/22/2002
• Est. Priority Date: 06/27/2000
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Harrison, Carl G., Rohde, Sheldon L.
• Primary Examiner(s): Reichard, Dean A.
• Assistant Examiner(s): OLIVA, CARMELO B
• Application Number:
  US09/604,646
• Time in Patent Office: 847 Days
• Field of Search: 174/35.R, 174/35.GC, 174/35.MS, 174/65.R, 439/607, 439/608, 439/609, 439/927, 439/939, 439/92, 439/95, 439/96, 277/920, 361/816, 361/818
• US Class Current: 174/360
• CPC Class Codes: H05K 9/0018 with provisions to reduce aperture leakages in walls, e.g. terminals, connectors, cables

Abstract

An EMI cable passthrough shield for a cable opening in an electronic system housing. The EMI cable passthrough shield includes portions made of an electrically conductive, deformable material having cable passageways to receive cable. A plurality of shields can be stacked in a cable opening of an electronic system housing. The shields can be compressed such that the deformable material completely encloses a cable. An example of a deformable electrically conductive material is an electrically conductive elastomeric material.

Claims

1. An EMI shield having cable passageways comprising:

at least one portion made of a deformable electrically conductive material, the at least one portion defining a plurality of cable passageways extending from a first side of the at least one portion to a second side of the at least one portion, wherein each cable passageway is to receive a cable extending through from the first side to the second side;

a plurality of slots extending from the first side to the second side to define an opening in a longitudinal side of each cable passageway of the plurality; and

wherein the at least one portion is formed in a single piece.

2. The EMI shield of claim 1 wherein the material is deformable such that when pressure is applied to the at least one portion in at least a first and second opposing directions, a cable passageway that is defined by the at least one portion closes such that the deformable material defining a cable passageway completely encloses a cable.

3. The EMI shield of claim 1 wherein each of the plurality of cable passageways has a length and a diameter, where the length is greater than the diameter.

4. The EMI shield of claim 3 wherein the length is at least twice the diameter.

5. The EMI shield of claim 1 wherein the shield further defines at least one mounting hole that is positioned in a generally perpendicular orientation to the plurality of cable passageways.

6. The EMI shield of claim 1 wherein the deformable material includes conductive elastomeric material.

7. The EMI shield of claim 6 wherein the conductive elastomeric material is a combination of at least silicone, nickel, and carbon.

8. The EMI shield of claim 1 further comprising:

a metal plate, wherein the at least one portion is attached to the metal plate.

9. The EMI shield of claim 8 wherein the at least one portion includes a third side located between the first and second sides, the third side being attached to the metal plate.

10. The EMI shield of claim 1 wherein the plurality of passageways are generally aligned in a row.

11. An electronic system comprising:

a housing having an opening;

an EMI shield mounted in the opening, the EMI shield including

at least one portion made of a deformable electrically conductive material, the at least one portion defining a plurality of cable passageways extending from a first side of the at least one portion to a second side of the at least one portion,

a plurality of slots extending from the first side to the second side to define an opening in a longitudinal side of each cable passageway of the plurality; and

wherein the at least one portion is formed in a single piece; and

a plurality of cables, each of the plurality of cables extending through a respective passageway of the plurality of passageways.

12. The electronic system of claim 11 wherein the at least one portion is compressed such that the deformable material defining a cable passageway completely encloses a cable.

13. The electronic system of claim 11 wherein each of the plurality of cable passageways has a length and a diameter, where the length is greater than the diameter.

14. The electronic system of claim 13 wherein the length is at least twice the diameter.

15. The electronic system of claim 11 wherein the deformable material includes conductive elastomeric material.

16. The electronic system of claim 15 wherein the conductive elastomeric material is a combination of at least silicone, nickel, and carbon.

17. The electronic system of claim 11 further comprising:

at least one standoff extending at least partially across the opening, the EMI shield including at least one mounting hole positioned in a generally perpendicular orientation to the plurality of cable passageways, the standoff extending through a mounting hole of the at least one mounting holes.

18. The electronic system of claim 11 further comprising:

at least another EMI shield mounted in the opening, each of the at least another EMI shield including at least one portion made of a deformable electrically conductive material, the at least one portion defining a plurality of cable passageways extending from a first side of the at least one portion to a second side of the at least one portion;

wherein each of the plurality of cables extends through a passageway of the plurality of passageways of the at least another EMI shield.

19. The electronic system of claim 18 wherein each of the EMI shields is mounted in the opening in a stacked orientation.

20. The electronic system of claim 18 wherein the cables pass through the opening in the cable passageways of the EMI shields in a two dimensional array pattern.

21. The electronic system of claim 18 further comprising:

a clamp plate attached to the housing to compress the at least one portion of the EMI shields.

22. A method for providing EMI shielding for an electronic system housing comprising:

positioning a plurality of EMI shields in an opening of an electronic system housing, each of the plurality of EMI shields including at least one portion made of a deformable electrically conductive material, the at least one portion defining a plurality of cable passageways extending from a first side of the at least one portion to a second side of the at least one portion, and wherein the at least one portion is formed in a single piece;

installing a plurality of cables in the plurality of cable passageways of the plurality of EMI shields by inserting the plurality of cables through a plurality of slots extending from the first side to the second side to define an opening in a longitudinal side of each cable passageway of the plurality; and

compressing the at least one portion of the plurality of EMI shields with the plurality of cables installed in the passageways.

23. The method of claim 22 wherein the compressing further includes compressing the at least one portion of the EMI shields such that the deformable material completely encloses a cable.

24. The method of claim 22 wherein the positioning and the installing further include:

positioning a first EMI shield of the plurality of EMI shields in the opening;

installing each of a first plurality of cables of the plurality of cables in a cable passageway of the first EMI shield;

positioning a second EMI shield of the plurality of EMI shields in the opening;

installing each of the second plurality of cables of the plurality of cables in a cable passageway of the second EMI shield.

25. The method of claim 22 wherein the positioning further includes mounting the EMI shields on standoffs that extend at least partially across the opening.

26. The method of claim 25 wherein the compressing further includes attaching a clamp to the standoffs against an end EMI shield of the plurality.

27. An electronic system comprising:

a housing having an opening; and

an EMI shield mounted in the opening, the EMI shield including;

deformable electrically conductive material, wherein the material is formed in a single piece; and

means for defining in the deformable electrically conductive material a plurality of cable passageways extending from a first side of the deformable electrically conductive material to a second side of the deformable electrically conductive material, each cable passageway for receiving a cable extending through from the first side to the second side; and

means for defining in the deformable electrically conductive material a plurality of slots extending from the first side to the second side to define an opening in a longitudinal side of each cable passageway of the plurality.

28. The electronic system of claim 27 wherein the deformable material includes conductive elastomeric material.