Shielding apparatus for electronic devices

• US 6,157,546 A
• Filed: 03/26/1999
• Issued: 12/05/2000
• Est. Priority Date: 03/26/1999
• Status: Expired due to Term

• Current Assignee: Optis Wireless Technology, LLC (Brevet Capital)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Horton, Robert Ray, Tolbert, William, Petty, John S., Villeneuve, Randy Morse
• Primary Examiner(s): Gandhi, Jayprakash N.
• Application Number:
  US09/277,675
• Time in Patent Office: 620 Days
• Field of Search: 361/683, 361/728, 361/736, 361/737, 361/752, 361/753, 361/796, 361/799, 361/800, 361/816, 361/818, 174/35 R, 174/35 GC, 174/51, 906/719
• US Class Current: 361/816
• CPC Class Codes: H05K 9/0032 having multiple parts, e.g. frames mating with lids
• CPC Class Codes: H05K 9/0035 with retainers mounted beforehand on the PCB, e.g. clips

Abstract

Electromagnetic shielding devices are provided that can be easily modified in shape and configuration to facilitate electronic device development. An electronic substrate includes a surface and a ground trace extending along the surface to define a perimeter of an area of the electronic substrate to be shielded. A plurality of electrically conductive block members are electrically secured to the ground trace in adjacent relationship. An electrically conductive cover is electrically secured to a top face of each of the block members to overlie the area of the electronic surface to be shielded.

Claims

1. An electromagnetic shielding apparatus, comprising:

a ground plane including a surface;

a plurality of detached, electrically conductive block members, wherein each detached block member is electrically connected to the ground plane surface in adjacent relationship to define a perimeter of an area of the ground plane surface to be shielded, wherein each detached, electrically conductive block member includes opposite front and back faces, a pair of opposite side faces, and top and bottom faces, wherein at least one of the detached, electrically conductive block members comprises a groove in a bottom face thereof, wherein the groove extends between the front and back faces of the at least one detached, electrically conductive block member, and wherein a conductive trace extends along the ground plane surface through the groove and across the perimeter of the shielded area; and

an electrically conductive cover secured to the top face of each of the detached, electrically conductive block members to overlie the area of the ground plane to be shielded.

2. An electromagnetic shielding apparatus according to claim 1 wherein the side faces of each detached, electrically conductive block member are generally parallel and wherein the top and bottom faces of each detached, electrically conductive block member are generally parallel.

3. An electromagnetic shielding apparatus according to claim 1 wherein the front and back faces of each detached, electrically conductive block member are generally parallel.

4. An electromagnetic shielding apparatus according to claim 1 wherein a gap between adjacent detached, electrically conductive block members is between 0.0 millimeters and 0.5 millimeters.

5. An electromagnetic shielding apparatus according to claim 1 wherein the detached, electrically conductive block members are in adjacent contacting relationship.

6. An electromagnetic shielding apparatus according to claim 1 wherein the cover is secured to the top face of each detached, electrically conductive block member via an electrically conductive adhesive.

7. An electromagnetic shielding apparatus according to claim 1 wherein each detached, electrically conductive block member comprises material selected from the group consisting of copper, copper alloy, aluminum, aluminum alloy, gold, gold alloy, silver, silver alloy, solder coated copper, nickel plated steel, and metalized polymer.

8. An electromagnetic shielding apparatus according to claim 1 wherein the cover comprises metalized polymeric material.

9. An electromagnetic shielding apparatus, comprising:

an electronic substrate that includes a surface and a ground trace extending along the surface to define a perimeter of an area of the electronic substrate to be shielded;

a plurality of detached, electrically conductive block members, wherein each detached member is electrically secured to the ground trace in adjacent relationship, wherein each detached block member includes opposite front and back faces, a pair of opposite side faces, and top and bottom faces, and wherein adjacent detached block members are separated by a distance of between 0.0 millimeters and 0.5 millimeters, wherein at least one of the detached, electrically conductive block members comprises a groove in a bottom face thereof, wherein the groove extends between the front and back faces of the at least one detached, electrically conductive block member, and wherein a conductive trace extends along the ground plane surface through the groove and across the perimeter of the shielded area; and

an electrically conductive cover electrically secured to the top face of each of the detached block members to overlie the area of the electronic surface to be shielded.

10. An electromagnetic shielding apparatus according to claim 9 wherein the side faces of each detached block member are generally parallel and wherein the top and bottom faces of each detached block member are generally parallel.

11. An electromagnetic shielding apparatus according to claim 9 wherein the front and back faces of each detached block member are generally parallel.

12. An electromagnetic shielding apparatus according to claim 9 wherein each detached block member is secured to the ground trace via an electrically conductive adhesive.

13. An electromagnetic shielding apparatus according to claim 9 wherein each detached block member is secured to the ground trace via solder.

14. An electromagnetic shielding apparatus according to claim 9 wherein the cover is secured to the top face of each detached block member via an electrically conductive adhesive.

15. An electromagnetic shielding apparatus according to claim 9 wherein each detached block member comprises material selected from the group consisting of copper, copper alloy, aluminum, aluminum alloy, gold, gold alloy, silver, silver alloy, solder coated copper, nickel plated steel, and metalized polymer.

16. An electromagnetic shielding apparatus according to claim 9 wherein the cover comprises metalized polymeric material.

17. An electronic apparatus, comprising:

an electronic substrate that includes a surface and a ground trace extending along the surface to define a perimeter of an area of the electronic substrate to be shielded;

and

an electromagnetic shielding apparatus secured to the electronic substrate surface, comprising;

a plurality of detached, electrically conductive block members electrically secured to the ground trace in adjacent relationship, wherein each detached block member includes opposite front and back faces, a pair of opposite side faces, and top and bottom faces, wherein at least one of the detached, electrically conductive block members comprises a groove in a bottom face thereof, wherein the groove extends between the front and back faces of the at least one detached, electrically conductive block member, and wherein a conductive trace extends along the ground plane surface through the groove and across the perimeter of the shielded area; and

an electrically conductive cover electrically secured to the top face of each of the detached block members to overlie the area of the electronic surface to be shielded.

18. An electronic apparatus according to claim 17 wherein the side faces of each detached block member are generally parallel and wherein the top and bottom faces of each detached block member are generally parallel.

19. An electronic apparatus according to claim 17 wherein the front and back faces of each detached block member are generally parallel.

20. An electronic apparatus according to claim 17 wherein a gap between adjacent detached block members is between 0.0 millimeters and 0.5 millimeters.

21. An electronic apparatus according to claim 17 wherein the detached block members are in adjacent contacting relationship.

22. An electronic apparatus according to claim 17 wherein each detached block member is secured to the ground trace via an electrically conductive adhesive.

23. An electronic apparatus according to claim 17 wherein each detached block member is secured to the ground trace via solder.

24. An electronic apparatus according to claim 17 wherein the cover is secured to the top face of each detached block member via an electrically conductive adhesive.

25. An electronic apparatus according to claim 17 wherein each detached block member comprises material selected from the group consisting of copper, copper alloy, aluminum, aluminum alloy, gold, gold alloy, silver, silver alloy, solder coated copper, nickel plated steel, and metalized polymer.

26. An electronic apparatus according to claim 17 wherein the cover comprises metalized polymeric material.

27. An electronic apparatus according to claim 17 wherein the electronic apparatus is a radiotelephone.

28. A Personal Computer Memory Card International Association (PCMCIA) card comprising:

a housing including an electrically conductive cover;

a printed circuit board (PCB) disposed within the housing, wherein the PCB includes a surface and a ground trace extending along the surface to define a perimeter of an area of the PCB to be shielded; and

a plurality of detached, electrically conductive block members electrically secured to the ground trace in adjacent relationship, wherein each detached block member includes opposite front and back faces, a pair of opposite side faces, and top and bottom faces, wherein the housing cover is electrically secured to the top face of each of the detached block members, and wherein at least one of the detached, electrically conductive block members comprises a groove in a bottom face thereof, wherein the groove extends between the front and back faces of the at least one detached, electrically conductive block member, and wherein a conductive trace extends along the ground plane surface through the groove and across the perimeter of the shielded area.

29. A PCMCIA card according to claim 28 wherein the side faces of each detached block member are generally parallel and wherein the top and bottom faces of each detached block member are generally parallel.

30. A PCMCIA card according to claim 28 wherein the front and back faces of each detached block member are generally parallel.

31. A PCMCIA card according to claim 28 wherein a gap between adjacent detached block members is between 0.0 millimeters and 0.5 millimeters.

32. A PCMCIA card according to claim 28 wherein the detached block members are in adjacent contacting relationship.

33. A PCMCIA card according to claim 28 wherein each detached block member is secured to the ground trace via an electrically conductive adhesive.

34. A PCMCIA card according to claim 28 wherein each detached block member is secured to the ground trace via solder.

35. A PCMCIA card according to claim 28 wherein the cover is secured to the top face of each detached block member via an electrically conductive adhesive.

36. A PCMCIA card according to claim 28 wherein each detached block member comprises material selected from the group consisting of copper, copper alloy, aluminum, aluminum alloy, gold, gold alloy, silver, silver alloy, solder coated copper, nickel plated steel, and metalized polymer.

37. A PCMCIA card according to claim 28 wherein the PCMCIA card is a radiotelephone card.

38. An electronic device, comprising:

a housing;

a peripheral device slot within said housing, said peripheral device slot comprising a peripheral device interface;

a peripheral device card removably secured within the peripheral device slot such that the peripheral device card is electrically connected to the peripheral device interface, wherein the peripheral device card comprises;

a housing including an electrically conductive cover;

a printed circuit board (PCB) disposed within the housing, wherein the PCB includes a surface and a ground trace extending along the surface to define a perimeter of an area of the PCB to be shielded; and

a plurality of detached, electrically conductive block members, wherein each detached member is electrically secured to the ground trace in adjacent relationship, wherein each detached block member includes opposite front and back faces, a pair of opposite side faces, and top and bottom faces, wherein the housing cover is electrically secured to the top face of each of the detached block members, and wherein at least one of the detached, electrically conductive block members comprises a groove in a bottom face thereof, wherein the groove extends between the front and back faces of the at least one detached, electrically conductive block member, and wherein a conductive trace extends along the ground plane surface through the groove and across the perimeter of the shielded area.

39. An electronic device according to claim 38 wherein the side faces of each detached block member are generally parallel and wherein the top and bottom faces of each detached block member are generally parallel.

40. An electronic device according to claim 38 wherein the front and back faces of each detached block member are generally parallel.

41. An electronic device according to claim 38 wherein a gap between adjacent detached block members is between 0.0 millimeters and 0.5 millimeters.

42. An electronic device according to claim 38 wherein the detached block members are in adjacent contacting relationship.

43. An electronic device according to claim 38 wherein each detached block member is secured to the ground trace via an electrically conductive adhesive.

44. An electronic device according to claim 38 wherein each detached block member is secured to the ground trace via solder.

45. An electronic device according to claim 38 wherein the cover is secured to the top face of each detached block member via an electrically conductive adhesive.

46. An electronic device according to claim 38 wherein each detached block member comprises material selected from the group consisting of copper, copper alloy, aluminum, aluminum alloy, gold, gold alloy, silver, silver alloy, solder coated copper, nickel plated steel, and metalized polymer.

47. An electronic device according to claim 38 wherein the peripheral device card comprises a radiotelephone transceiver.

48. An electronic device according to claim 38 wherein said electronic device comprises a data processor.

49. An electronic device according to claim 38 wherein said peripheral device interface is a PCMCIA interface and wherein said peripheral device card is a PCMCIA card.