MAGNETIC SHIELD, PROGRAM, AND SELECTION METHOD

• US 20120249274A1
• Filed: 04/03/2012
• Published: 10/04/2012
• Est. Priority Date: 04/04/2011
• Status: Active Grant

• Current Assignee: Columbia Peak Ventures, LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: NAGASAKA, Kimio, TODA, Shigemitsu
• Granted Patent: US 9,063,183 B2
• Time in Patent Office: Days
• US Class Current: 335/301
• CPC Class Codes: G01R 33/0076 Protection, e.g. with housings against stray fields
• CPC Class Codes: H01F 7/0273 Magnetic circuits with PM for magnetic field generation

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.

Claims

1. A magnetic shield comprising:

a first layer that is configured by a first material and that includes a hollow portion on an inside; and

a second layer that is a hollow member that is configured by a second material that is different from the first material, and which is placed in the hollow portion,

wherein in regions between the first layer and the second layer, a relative magnetic permeability of the second material at a strength of a 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.

2. A magnetic shield comprising:

three or more layers,

wherein out of the three or more layers, in a case when any one layer excluding a layer placed to an innermost side is a first layer and any one layer that is placed in a hollow portion on an inside of the first layer is a second layer,

a first material that configures the first layer and a second material that configures the second layer are different, and

in regions between the first layer and the second layer, a relative magnetic permeability of the second material at a strength of a 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.

3. The magnetic shield according to claim 2,

wherein the second layer is a layer that is placed on an outermost side out of layers that are placed in the hollow portion, and

in all combinations of the first layer and the second layer, in regions between the first layer and the second layer, a relative magnetic permeability of the second material at a strength of a 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.

4. A program for causing a computer that includes a storage section that stores a relative magnetic permeability with respect to a strength of a magnetic field for each material to function, the program comprising:

a specifying section that specifies a strength of a magnetic field of an environment in which a magnetic shield is placed;

a first selection section that references a storage content of the storage section and selects a material with the greatest relative magnetic permeability with respect to the strength of the magnetic field that is specified in the specifying section as a first material that is a material of an outer layer of the magnetic shield;

an estimating section that estimates, in a case when the outer layer is manufactured using the first material that is selected by the first selection section, in regions between the outer layer and an inner layer that is placed in a hollow portion on an inside of the outer layer, the strength of the magnetic field in a region that is next to the inner layer; and

a second selection section that references the storage content of the storage section and selects a material with the greatest relative magnetic permeability with respect to the strength of the magnetic field that is estimated by the estimating section as a second material that is the material of the inner layer.

5. A selection method of a material of a magnetic shield, comprising:

a specifying section specifying a strength of a magnetic field of an environment in which a magnetic shield is placed;

a first selection section referencing a storage content of a storage section in which a relative magnetic permeability with respect to a strength of a magnetic field for each material is stored and selecting a material with the greatest relative magnetic permeability with respect to the strength of the magnetic field that is specified by the specifying section as the first material that is a material of an outer layer of the magnetic shield;

an estimating section estimating, in a case when the outer layer is manufactured using the first material that is selected by the first selection section, in regions between the outer layer and an inner layer that are placed in a hollow portion on an inside of the outer layer, the strength of the magnetic field in a region that is next to the inner layer; and

a second selection section referencing the storage content of the storage section and selecting a material with the greatest relative magnetic permeability with respect to the strength of the magnetic field that is estimated by the estimating section as a second material that is the material of the inner layer.