Magnetic shield, program, and selection method
First Claim
Patent Images
1. A magnetic shield comprising:
- three or more hollow members including a center hollow member, a first hollow member, and a second hollow member, whereinthe 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, andthe second material is a different one of the permalloy, the iron-based amorphous materials, and the ferrite sintered body.
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Abstract
A magnetic shield including a first layer and a second layer and shielding an environmental magnetic field is obtained by manufacturing the first layer that is configured by a first material and that includes a hollow portion on the inside and the second layer that is configured by a second material that is different from the first material and which is a hollow member and placing the second layer in the hollow portion of the first layer. With the magnetic shield, in regions between the first layer and the second layer, a material in which the relative magnetic permeability at the strength of the magnetic field at a region that is next to the second layer is high compared to the relative magnetic permeability of the first material at the strength of the magnetic field is selected as the second material that configures the second layer.
21 Citations
2 Claims
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1. A magnetic shield comprising:
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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.
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2. A magnetic shield comprising:
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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, a magnetic field strength in which the relative magnetic permeability of the first material is the highest is stronger than a magnetic field strength in which the relative magnetic permeability of the second material is the highest, and 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.
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Specification
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Current AssigneeColumbia Peak Ventures, LLC (Dominion Harbor Enterprises, LLC)
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Original AssigneeSeiko Epson Corporation (Seiko Group)
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InventorsToda, Shigemitsu, Nagasaka, Kimio
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Primary Examiner(s)Talpalatski, Alexander
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Application NumberUS14/716,509Publication NumberTime in Patent Office686 DaysField of Search335301US Class CurrentCPC Class CodesG01R 33/0076 Protection, e.g. with housi...H01F 7/0273 Magnetic circuits with PM f...
