Patent ID: 9612295
Date: 2017-04-04
CPC Classifications: G01R,H01F

Claim:
1. A magnetic shield comprising: three or more hollow members including a center hollow member, a first hollow member, and a second hollow member, wherein the center hollow member is located innermost among the three or more hollow members, the center hollow member is disposed inside of the second hollow member without contacting the second hollow member, the second hollow member is disposed inside of the first hollow member without contacting the first hollow member, the first hollow member is configured by a first material, the second hollow member is configured by a second material that is different from the first material, a magnetic field strength of a region between the first and second hollow members is a first reference magnetic field strength, a relative permeability of the second hollow member with respect to the first reference magnetic field strength is higher than a relative permeability of the first hollow member with respect to the first reference magnetic field strength, a magnetic field strength of a region between the second and the center hollow members is a second reference magnetic field strength, a relative permeability of the center hollow member with respect to the second reference magnetic field strength is higher than a relative permeability of the second hollow member with respect to the second reference magnetic field strength, the first material is one of a permalloy, iron-based amorphous materials, and a ferrite sintered body, and the second material is a different one of the permalloy, the iron-based amorphous materials, and the ferrite sintered body.