EMI shielding for portable electronic devices

• US 6,738,265 B1
• Filed: 04/19/2000
• Issued: 05/18/2004
• Est. Priority Date: 04/19/2000
• Status: Expired due to Fees

• Current Assignee: Nokia Mobile Phones UK Limited (Nokia Corporation)
• Original Assignee: Nokia Mobile Phones UK Limited (Nokia Corporation)
• Inventors: Järvelä, Pentti, Rissanen, Marja, Pyykkö, Ilpo, Svarfvar, Bror, Nousiainen, Pertti, Kaikuranta, Terho
• Primary Examiner(s): Pert, Evan
• Assistant Examiner(s): DINH, TUAN T
• Application Number:
  US09/552,221
• Time in Patent Office: 1,490 Days
• Field of Search: 361/752-753, 361/800, 361/814, 361/816-818, 174/51, 174/52-- 5, 174/35.R, 174/35.MS, 174/35.GC, 438/57, 438/106, 428/253-255, 156/242-245, 455/90, 442/117-118
• US Class Current: 361/818
• CPC Class Codes: D04C 1/06 Braid or lace serving particular purposes
• CPC Class Codes: D04C 1/08 Tulle fabrics
• CPC Class Codes: D10B 2401/16 antistatic; conductive
• CPC Class Codes: H05K 9/003 made from non-conductive materials comprising an electro-conductive coating H05K9/0031 takes precedence
• CPC Class Codes: H05K 9/009 comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked

Abstract

A fiber mesh net is insert molded into an interior cavity of a cover structure of a portable electronic device such as a cellular or radio telephone to provide EMI shielding. The fiber mesh net is also bonded to one surface of a polymer sheet which additionally carries electronic circuitry on its opposite side to form a laminate which is inserted molded into a cover structure to extend electrical circuitry functionality via selected fibers of the fiber mesh net for access from the electronic device cover.

Claims

1. A method for making an EMI shielded portable electronic device, said method characterized by the steps of:

providing an electrically conductive woven fiber mesh net comprising a given pattern of woven threads of intertwisted electrically conductive fibers defining the fiber mesh net, and insert molding the woven fiber mesh net into the wall surfaces defining an interior cavity in the cover structure of said portable electronic device during the molding process of the cover structure.

2. The method for making an EMI shielded portable electronic device as set forth in claim 1 wherein the step of providing an electrically conductive woven fiber mesh net is further characterized by a bobbinet woven fiber mesh net.

3. The method for making an EMI shielded portable electronic device as set forth in claim 1 wherein the step of providing an electrically conductive woven fiber mesh net is further characterized by providing a textile structure electrically conductive woven fiber mesh net.

4. The method for making an EMI shielded portable electronic device as set forth in claim 1 wherein the step of providing an electrically conductive woven fiber mesh net is further characterized by the step of laminating said woven fiber mesh net to a polymer film sheet.

5. The method for making an EMI shielded portable electronic device as set forth in claim 1 further characterized by said insert molded fiber mesh net interior cavity in the cover structure defining means for containing first electronic circuitry within the portable electronic device.

6. The method for making an EMI shielded portable electronic device as set forth in claim 3 wherein the step of providing the textile electrically conductive woven fiber mesh net includes providing warp knitted, woven, Raschel, braided, non-woven and spun multidirectional textile structures.

7. The method for making an EMI shielded portable electronic device as set forth in claim 4 further characterized in that said polymer film sheet has an electrically non-conductive surface side opposite said electrically conductive woven fiber mesh net surface side for carrying second electronic circuitry, said electrically conductive woven fiber mesh net having at least a portion extending to the non-conductive surface side of said polymer film sheet for mechanical and electrical coupling to said second electronic circuitry.

8. The method for making an EMI shielded portable electronic device as set forth in claim 5 wherein the step of providing an electrically conductive woven fiber mesh net is further characterized by the step of laminating said woven fiber mesh net to a polymer film sheet.

9. The method for making an EMI shielded portable electronic device as set forth in claim 6 further characterized in that said electrically conductive woven fiber mesh net is further characterized by at least a part of said woven fiber mesh net being a mixture of conductive and non-conductive fibers.

10. The method for making an EMI shielded portable electronic device as set forth in claim 7 further characterized in that said electrically conductive woven fiber mesh net is further characterized by at least a part of said woven fiber mesh net being a mixture of conductive and non-conductive fibers.

11. The method for making an EMI shielded portable electronic device as set forth in claim 8 further characterized in that said polymer film sheet has an electrically non-conductive surface side opposite said electrically conductive woven fiber mesh net surface side for carrying second electronic circuitry, said electrically conductive woven fiber mesh net having at least a portion extending to the non-conductive surface side of said polymer film sheet for mechanical and electrical coupling to said second electronic circuitry.

12. The method for making an EMI shielded portable electronic device as set forth in claim 11 further characterized by providing at least a part of said electrically conductive woven fiber mesh net having a mixture of conductive and non-conductive fibers wherein at least one of said conductive fibers carries electrical signals between said first electronic circuitry and said second electronic circuitry.

13. An EMI shielded portable electronic device characterized by:

wall surfaces defining at least one interior cavity within the cover structure of said electronic device, and

an electrically conductive woven fiber mesh net comprising a given pattern of woven threads of intertwisted electrically conductive fibers defining the fiber mesh net insert molded into said wall surfaces defining said interior cavity within the cover structure.

14. The EMI shielded portable electronic device as set forth in claim 13 further characterized in that said electrically conductive woven fiber mesh net is a bobbinet woven fiber mesh net.

15. The EMI shielded portable electronic device as set forth in claim 13 further characterized in that said electrically conductive woven fiber mesh net comprises a textile structure mesh net.

16. The EMI shielded portable electronic device as set forth in claim 13 further characterized in that said electrically conductive woven fiber mesh net is preformed to the size, shape and contour of said interior cavity for insert molding into said wall surfaces defining said interior cavity within the cover structure.

17. The EMI shielded portable electronic device as set forth in claim 13 further characterized by a laminate of said electrically conductive woven fiber mesh net and a polymer film sheet.

18. The EMI shielded portable electronic device as set forth in claim 13 further characterized in that said insert molded interior cavity within the cover structure carries first electronic circuitry within said portable electronic device.

19. The EMI shielded portable electronic device as set forth in claim 14 further characterized in that said bobbinet woven fiber mesh net is a bobbinet woven 3-directional fiber mesh net.

20. The EMI shielded portable electronic device as set forth in claim 15 further characterized in that said textile structure fiber mesh net includes all of warp knitted, woven, Raschel, braided, non-woven and spun multidirectional textile structures.

21. The EMI shielded portable electronic device as set forth in claim 17 further characterized in that said polymer film sheet has an electrically non-conductive surface side opposite said fiber mesh net surface side for carrying second electronic circuitry.

22. The EMI shielded portable electronic device as set forth in claim 18 further characterized by a laminate of said electrically conductive woven fiber mesh net and a polymer film sheet.

23. The EMI shielded portable electronic device as set forth in claim 19 wherein said bobbinet woven 3-directional fiber mesh net is further characterized by 6 to 34 openings per inch and a specific weight of 10 to 50 grams per square meter.

24. The EMI shielded portable electronic device set forth in claim 21 further characterized in that at least a part of said electrically conductive woven fiber mesh net is a mixture of conductive and non-conductive fibers.

25. The EMI shielded portable electronic device as set forth in claim 22 further characterized in that said polymer film sheet has an electrically non-conductive surface side opposite said fiber mesh net surface side for carrying second electronic circuitry.

26. The EMI shielded portable electronic device as set forth in claim 25 further characterized in that at least a portion of said electrically conductive woven fiber mesh net is electrically coupled to said second electronic circuitry and to first electronic circuitry within said electrical device for passing electronic signals between said first and said second electronic circuitries.

27. The EMI shielded portable electronic device as set forth in claim 26 wherein said portable electronic device is further characterized by a portion of said cover structure including at least one interior cavity wherein said insert molded electrically conductive woven fiber mesh net is arranged such that said second electronic circuitry is electrically coupled to other electronic circuitry carried on the exterior of said cover structure and for passing electrical signals between said other and said second circuitries.