Magnetic sensor device

• US 10,591,555 B2
• Filed: 03/14/2017
• Issued: 03/17/2020
• Est. Priority Date: 03/30/2016
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Matsui, Hideki, Ogomi, Tomokazu, Okada, Masaaki, Shimohata, Kenji, Yoshioka, Sadaaki
• Primary Examiner(s): Assouad, Patrick
• Assistant Examiner(s): Pretlow, Demetrius R
• Application Number:
  US16/078,604
• Publication Number:
  US 20190056461A1
• Time in Patent Office: 1,099 Days
• Field of Search: 324288
• CPC Class Codes: G01R 33/0076 Protection, e.g. with housings against stray fields
• CPC Class Codes: G01R 33/02 Measuring direction or magnitude of magnetic fields or magnetic flux G01R33/20 takes precedence
• CPC Class Codes: G01R 33/09 Magnetoresistive devices
• CPC Class Codes: G01R 33/091 Constructional adaptation of the sensor to specific applications
• CPC Class Codes: G01R 33/093 using multilayer structures, e.g. giant magnetoresistance sensors thin magnetic films H01F10/00
• CPC Class Codes: G07D 7/00 Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
• CPC Class Codes: G07D 7/04 Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint G07D7/01 takes precedence

Abstract

A magnetic sensor device includes: a magnet; a magnetic-resistance-effect-element mounted substrate on which a magnetic-resistance-effect-element mounted body is mounted on a surface thereof opposite to a surface thereof facing the magnet, the magnetic-resistance-effect-element mounted body extending in the longitudinal direction of the magnet; a case that accommodates or retains the magnet and the magnetic-resistance-effect-element mounted substrate; and a magnetic shield that covers the case except for the surface of the magnetic-resistance-effect-element mounted substrate on which is mounted the magnetic-resistance-effect-element mounted body. The magnetic shield covers the case at a position corresponding to the surface of the magnetic-resistance-effect-element mounted substrate facing the magnet, or from the position corresponding to the surface of the magnetic-resistance-effect-element mounted substrate facing the magnet to a side of the case opposite to the magnet.

Claims

1. A magnetic sensor device comprising:

a magnet;

a substrate including a magnetic-resistance-effect-element mounted body mounted on a surface thereof opposite to a surface thereof facing the magnet, the magnetic-resistance-effect-element mounted body formed along a longitudinal direction of the magnet;

a case that accommodates or retains the magnet and the substrate; and

a magnetic shield to cover the case except for the surface of the substrate on which the magnetic-resistance-effect-element mounted body is mounted, wherein

the magnetic shield comprises;

a bottom that faces a surface of the case, the surface being disposed to oppose the substrate across the magnet, and

side walls standing from the bottom toward a side adjacent to the substrate, the side walls being spaced from each other in a transverse direction intersecting the longitudinal direction, the side walls extending in the longitudinal direction of the magnet, and

the side walls have ends on the side adjacent to the substrate, the ends being located between a position of a surface where the substrate opposes the magnet and a position of a surface where the magnetic-resistance-effect-element mounted body is mounted on the substrate.

5. The magnetic sensor device according to claim 1, further comprising:

a cover of a non-magnetic material, the cover covering the surface of the substrate on which the magnetic-resistance-effect-element mounted body is mounted, the cover being in contact with the ends of the side walls on the side adjacent to the substrate.

8. The magnetic sensor device according to claim 1, wherein the substrate is a resin substrate on which the magnetic-resistance-effect-element mounted body is mounted.

9. The magnetic sensor device according to claim 1, wherein the substrate is a metal carrier on which the magnetic-resistance-effect-element mounted body is mounted.

2. The magnetic sensor device according to claim wherein

the magnetic shield further comprises:

second side walls standing from the bottom toward the side adjacent to the substrate, the second side walls being spaced from each other in the longitudinal direction, the second side walls extending in the transverse direction, and

the second side walls have ends on the side adjacent to the substrate, the ends being located between a position of a surface where the substrate opposes the magnet and a position of a surface where the magnetic-resistance-effect-element mounted body is mounted on the substrate.

6. The magnetic sensor device according to claim 2, further comprising:

a cover of a non-magnetic material, the cover covering the surface of the substrate on which the magnetic-resistance-effect-element mounted body is mounted, wherein

the cover is in contact with the ends of the side walls on the side adjacent to the substrate, and

the cover is in contact with the ends of the second side walls on the side adjacent to the substrate.

15. The magnetic sensor device according to claim 2, wherein

the case is formed of an electrically conductive material,

the magnetic shield is formed of an electrically conductive magnetic material,

the case is electrically connected to the magnetic shield, and

the case is grounded.

16. The magnetic sensor device according to claim 2, wherein the substrate is a resin substrate on which the magnetic-resistance-effect-element mounted body is mounted.

17. The magnetic sensor device according to claim 2, wherein the substrate is a metal carrier on which the magnetic-resistance-effect-element mounted body is mounted.

3. The magnetic sensor device according to claim wherein

the magnetic shield further comprises:

second side walls standing from the bottom toward the side adjacent to the substrate, the second side walls being spaced from each other in the longitudinal direction, the second side walls extending in the transverse direction, and

the second side walls have ends on the side adjacent to the magnetic-resistance-effect-element mounted substrate, the ends being located at a same position as a surface of the magnet opposite to a surface facing the magnetic-resistance-effect-element mounted substrate.

4. A magnetic sensor device comprising:

a magnet;

a substrate including a magnetic-resistance-effect-element mounted body mounted on a surface thereof opposite to a surface thereof facing the magnet, the magnetic-resistance-effect-element mounted body extending in a longitudinal direction of the magnet;

a case that accommodates or retains the magnet and the substrate; and

a magnetic shield to cover the case except for the surface of the substrate can which the magnetic-resistance-effect-element mounted body is mounted, wherein

the magnetic shield comprises;

a bottom that faces a surface of the case, the surface being disposed so as to oppose the substrate across the magnet, and

side walls standing from the bottom toward a side adjacent to the substrate, the side walls being spaced from each other in a transverse direction intersecting the longitudinal direction, the side walls extending in the longitudinal direction of the magnet, and

second side walls standing from the bottom toward the side adjacent to the substrate, the second side walls being spaced from each other in the longitudinal direction, the second side walls extending in the transverse direction,

the side walls have ends on the side adjacent to the substrate, the ends being located at a same position as the surface of the magnetic substrate facing the magnet or extending more distant from the magnet than the surface of the substrate facing the magnet, and

the second side walls have ends on the side adjacent to the substrate, the ends being located at a same position as a surface of the magnet opposite to a surface facing the substrate.

10. The magnetic sensor device according to claim 4, further comprising:

a cover formed of a non-magnetic material, the cover covering the surface of the substrate on which the magnetic-resistance-effect-element mounted body is mounted, the cover being in contact with the ends of the side walls on the side adjacent to the substrate.

11. The magnetic sensor device according to claim 4, further comprising:

a cover of a non-magnetic material, the cover covering, the surface of the substrate on which the magnetic-resistance-effect-element mounted body is mounted, wherein

the cover is in contact with the ends of the side wall on the side adjacent to the substrate, and

the cover is in contact with the ends of the second side walls on the side adjacent to the substrate.

12. The magnetic sensor device according to claim 4, wherein

the case is formed of an electrically conductive material,

the magnetic shield is formed of an electrically conductive magnetic material,

the case is electrically connected to the magnetic shield, and

the case is grounded.

13. The magnetic sensor device according to claim 4, wherein the substrate is a resin substrate on which the magnetic-resistance effect-element mounted body is mounted.

14. The magnetic sensor device according to claim 4, wherein the substrate is a metal carrier on which the magnetic-resistance-effect-element mounted body is mounted.

7. The magnetic sensor device according to claim wherein

the case is formed of an electrically conductive material,

the magnetic shield is formed of an electrically conductive magnetic material,

the case is electrically connected to the magnetic shield, and

the case is grounded.