| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic shield device for reducing an influence onto an external magnetic field.SOLUTION: A magnetic shield device 1 includes: a passive shield 11 having an internal space 110 and at least one opening 111; an external coil 12 for correcting a magnetic field in the vicinity of the opening 111; an internal coil 13 for correcting the magnetic field in the internal space 110; a drive circuit 15A for driving the external coil 12; and a drive circuit 15B for driving the internal coil 13. In the magnetic shield device 1, the magnetic field corrected by the external coil 12 is reduced by the passive shield 11 and further reduced by the internal coil 13. |
