Electromagnetic shield

• US 20040130475A1
• Filed: 12/09/2003
• Published: 07/08/2004
• Est. Priority Date: 12/09/2002
• Status: Abandoned Application

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Rieuvernet, Pierre, Dreux, Jean-Francois, Cohen, Xavier
• Application Number:
  US10/730,289
• Publication Number:
  US 20040130475A1
• Time in Patent Office: Days
• US Class Current: 342/1
• 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 9/0041 Ventilation panels having provisions for screening

Abstract

An electromagnetic absorber for a computer includes an array of conduits allowing airflow and having electrically conductive internal walls for absorbing electromagnetic radiation. The absorber is formed from a foamed metal or metal alloy or a foamed or non-foamed member treated to be conductive. The electromagnetic absorber can also be an acoustic absorber.

Claims

1. An electromagnetic absorber for absorbing electromagnetic radiation including a member of foamed material having a plurality of air conduits formed therein, which conduits have walls capable of absorbing electromagnetic radiation.

2. An electromagnetic absorber according to claim 1, wherein the foamed member is formed from polyurethane.

3. An electromagnetic absorber according to claim 2, wherein the member is formed from polyurethane to which small particles of carbon are added.

4. An electromagnetic absorber according to claim 1, wherein the conductive coating is formed from one of painting and insertion of a conductive tube held against the internal walls of the passages.

5. An electromagnetic absorber according to claim 1, wherein the internal walls of the passages include an electrically conductive coating.

10. An electromagnetic absorber according to claim 1, wherein the foamed member is formed from a foamed metal or foamed metal alloy.

11. An electromagnetic absorber according to claim 1, wherein the material of the absorber is acoustically absorbing.

13. A casing for an electronic device, the casing including within at least a part thereof an electromagnetic absorber according to claim 1.

15. A casing according to claim 13, wherein the casing includes an opening and fixtures for fixing the electromagnetic absorber structure into the opening.

16. A casing according to claim 13, wherein the electromagnetic absorber is formed integrally with the casing.

17. A casing according to claim 13, wherein the conduits have a cross-sectional diameter of between 10 and 15 mm.

18. A computer including the casing of claim 13.

19. A personal computer including the casing of claim 13.

6. An electromagnetic absorber for absorbing electromagnetic radiation including a member of non-conductive material having a plurality of air conduits formed therein, which conduits have internal walls capable of absorbing electromagnetic radiation.

7. An electromagnetic absorber according to claim 6, wherein the member is painted with an electrically conductive paint.

8. An electromagnetic absorber according to claim 6, wherein the internal walls of the passages include an electrically conductive coating.

9. An electromagnetic absorber according to claim 8, wherein the electrically conductive coating is formed by painting or insertion of a conductive tube held against the internal walls of the passages.

12. An electromagnetic absorber according to claim 6, wherein the material of the absorber is acoustically absorbing.

14. A casing for an electronic device, the casing including within at least a part thereof an electromagnetic absorber according to claim 6.

20. Use in an electromagnetic absorber of one of a foamed member having a plurality of air conduits formed therein and a member of non-conductive material having a plurality of air conduits formed therein, which conduits have internal walls capable of absorbing electromagnetic radiation.