MAGNETIC SHIELD, PROGRAM, AND SELECTION METHOD

• US 20150253391A1
• Filed: 05/19/2015
• Published: 09/10/2015
• 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: TODA, Shigemitsu, NAGASAKA, Kimio
• Granted Patent: US 9,612,295 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 hollow member that is configured by a first material; and

a second hollow member that is configured by a second material that is different from the first material, the second hollow member is disposed inside the first hollow member, wherein

a relative magnetic permeability of the first material in the first magnetic field is higher than a relative magnetic permeability of the second material in the first magnetic field is.

2. A magnetic shield according to claim 1,

wherein the relative magnetic permeability of the first material in the second magnetic field, which is weaker than the first magnetic field is, is lower than the relative magnetic permeability of the second material in the second magnetic field is.

3. A magnetic shield according to claim 2,

wherein the first magnetic field is a magnetic field of the environment in which the magnetic shield is placed.

4. A magnetic shield according to claim 3,

wherein the second magnetic field is a magnetic field of the space between the first hollow member and the second hollow member.

5. A magnetic shield according to claim 4, further comprising a third hollow member that is configured by a third material that is different from the first and second materials, the third hollow member is disposed inside the second hollow member, wherein

a relative magnetic permeability of the second material in the second magnetic field is higher than a relative magnetic permeability of the third material in the second magnetic field is.

6. A magnetic shield according to claim 5,

wherein the relative magnetic permeability of the second material in the third magnetic field, which is weaker than the second magnetic field is, is lower than the relative magnetic permeability of the third material in the third magnetic field is.

7. A magnetic shield according to claim 6,

wherein the third magnetic field is a magnetic field of the space between the second hollow member and the third hollow member.

8. A magnetic shield (9) comprising:

a first hollow member that is configured by a first material; and

a second hollow member that is configured by a second material that is different from the first material, the second hollow member is disposed inside the first hollow member, wherein

the fourth magnetic field in which a relative magnetic permeability of the first material is the highest is stronger than the fifth magnetic field in which a relative magnetic permeability of the second material is the highest is.

9. A magnetic shield according to claim 8,

wherein the relative magnetic permeability of the first material in the sixth magnetic field which is any magnetic fields stronger than the fourth magnetic field is higher than the relative magnetic permeability of the second material in the sixth magnetic field is.