METHOD FOR COMBINING HIGHLY PERMEABLE PARTS OF A MAGNETIC SHIELD

• US 20110137145A1
• Filed: 12/13/2010
• Published: 06/09/2011
• Est. Priority Date: 06/13/2008
• Status: Abandoned Application

• Current Assignee: BMDSys Production GmbH
• Original Assignee: BMDSys Production GmbH
• Inventors: Nowak, Hannes, Bison, Georg, Erné, Sergio Nicola
• Application Number:
  US12/966,667
• Publication Number:
  US 20110137145A1
• Time in Patent Office: Days
• US Class Current: 600/409
• CPC Class Codes: G01R 31/318533 using scanning techniques, e.g. LSSD, Boundary Scan, JTAG
• CPC Class Codes: G01R 33/025 Compensating stray fields G01R33/0017 takes precedence
• CPC Class Codes: H05K 9/0003 Shielded walls, floors, ceilings, e.g. wallpaper, wall panel, electro-conductive plaster, concrete, cement, mortar
• CPC Class Codes: H05K 9/0075 Magnetic shielding materials
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

An inventive magnetic filling material for bridging interspaces in magnetic shields for shielding static or low-frequency magnetic fields. The magnetic filling material comprises at least one matrix material and at least one magnetic component embedded into the matrix material. The magnetic component has magnetically shielding properties.

Claims

1. A magnetic filling material for bridging interspaces in magnetic shields and for shielding static or low-frequency magnetic fields, comprising:

at least one matrix material; and

at least one magnetic component embedded in the at least one matrix material, wherein the at least one magnetic component has magnetically shielding properties and comprises a material having a permeability of at least 100.

2. The magnetic filling material of claim 1, wherein the at least one matrix material has substantially diamagnetic properties.

3. The magnetic filling material of claim 1, wherein the at least one matrix material has a deformable state and a cured state, wherein the at least one matrix material is liquid or has at least partly plastic and/or elastic properties in the deformable state, and wherein the at least one matrix material is substantially rigid in the cured state.

4. The magnetic filling material of claim 1, wherein the at least one matrix material comprises an adhesive.

5. The magnetic filling material of claim 1, wherein the at least one matrix material comprises at a resin, a multi-component adhesive or at least one component of a multi-component adhesive.

6. The magnetic filling material of claim 1, wherein the at least one magnetic component comprises at least one ferromagnetic material having a permeability of at least 300.

7. The magnetic filling material of claim 1, wherein the at least one magnetic component comprises at least one ferromagnetic material having a permeability of at least 1000.

8. The magnetic filling material of claim 1, wherein the at least one magnetic component comprises a metallic material.

9. The magnetic filling material of claim 1, wherein the at least one magnetic component comprises at least one of the following materials:

iron;

nickel;

an alloy comprising the elements iron and nickel comprising a nickel fraction of between 60% and 90%.

10. The magnetic filling material of claim 1, wherein the at least one magnetic component comprises an alloy comprising the elements iron and nickel and having a nickel fraction of between 75% and 80%.

11. The magnetic filling material of claim 1, wherein the at least one magnetic component comprises a powder or particles.

12. The magnetic filling material of claim 11, wherein the at least one magnetic component comprises particles having an average particle size of less than 500 micrometers.

13. The magnetic filling material of claim 12, wherein the particles have an average particle size of less than 90 micrometers.

14. The magnetic filling material of claim 12, wherein the particles have an average particle size of about 60 micrometers.

15. The magnetic filling material of claim 1, wherein the at least one magnetic component comprises a mass fraction of 5 to 50 weight percent of the magnetic filling material.

16. The magnetic filling material of claim 15, wherein the at least one magnetic component comprises a mass fraction of about 15 weight percent of the magnetic filling material.

17. The magnetic filling material of claim 1, wherein the at least one magnetic component comprises a volume fraction of 1 to 30 volume percent of the magnetic filling material.

18. A magnetic shield for shielding static or low-frequency magnetic fields, comprising:

a shielding element having magnetically shielding properties and having an opening; and

a magnetic filling material disposed in the opening, the magnetic filling material comprising a matrix material having a magnetic component embedded therein, wherein the magnetic component has magnetically shielding properties and is configured for reinforcing the magnetic shield.

19. The magnetic shield of claim 18, wherein the shielding element comprises first and second shielding elements and the opening comprises a connecting region at which the shielding elements are connected to one another, wherein the magnetic filling material is disposed in the connecting region and reinforces the magnetic shield.

20. The magnetic shield of claim 18, wherein the opening comprises at least one of the following elements:

a leadthrough;

a joining location;

a seam location; and

a butt joint.

21. The magnetic shield of claim 18, wherein the shielding elements comprise at least one of the following materials:

iron;

nickel; and

an alloy comprising the elements iron and nickel and having a nickel fraction of between 60% and 90%.

22. The magnetic shield of claim 21, wherein the shielding elements comprise an alloy comprising the elements iron and nickel and having a nickel fraction of between 75% and 80%.

23. The magnetic shield of claim 18, wherein the shielding elements are configured substantially as plate-type elements.

24. The magnetic shield of claim 18, wherein the shielding elements have a permeability of at least 100.

25. The magnetic shield of claim 18, wherein the magnetic shield has a substantially parallelepipedal form.

26. The magnetic shield of claim 18, wherein the magnetic shield encloses an accessible interior space of at least 1 m³.

27. A biomagnetic measurement system for use in magnetocardiology or magnetoneurology, comprising:

a magnetic sensor system for detecting at least one magnetic field; and

a magnetic shield as claimed in claim 18.

28. A method for producing a magnetic shield, comprising:

connecting at least two shielding elements to one another and thereby forming a connecting region in an area where the two shielding elements are connected; and

introducing magnetic filling material into the connecting region, the magnetic filling material comprising a matrix material with a magnetic component embedded therein, the magnetic component having magnetically shielding properties.

29. The method of claim 28, further comprising introducing the magnetic filling material into the connecting region in a deformable state and then allowing the magnetic filling material to cure.

30. The method of claim 28, further comprising connecting the shielding elements to one another by a force-locking connection, a positively locking connection or a cohesive connection.

31. The method of claim 28, further comprising connecting the shielding elements to one another by a plug connection.

32. The method of claim 28, further comprising connecting the shielding elements to one another by welding.

33. The method of claim 28, further comprising mixing the magnetic component into the matrix material.