公开(公告)号：US20190128700A1

公开(公告)日：2019-05-02

申请号：US16170089

申请日：2018-10-25

Applicant: TDK Corporation

Inventor： Keisuke UCHIDA ,  Yuta SAITO

IPC: G01D5/16

Abstract: A magnetic sensor according to the invention has an element portion having a magnetoresistive effect and a magnetically sensitive axis that is directed in a predetermined direction, and a soft magnetic body that is arranged near the element portion and that faces the element portion along at least a part of a portion other than both end portions thereof, as viewed in a direction of the magnetically sensitive axis. The soft magnetic body has protruding surfaces that protrude toward the element portion at said both end portions.

公开(公告)号：US20180275215A1

公开(公告)日：2018-09-27

申请号：US15825289

申请日：2017-11-29

Applicant: TDK Corporation

Inventor： Keisuke UCHIDA ,  Hiraku HIRABAYASHI

IPC: G01R33/09

CPC classification number: G01R33/09 ,  G01R33/093 ,  H01F1/12 ,  H01F3/00 ,  H01F10/3254 ,  H01F10/3268

Abstract: The magnetic sensor can prevent an increase of a positional detection error of a subject/object even in the case of applying an external magnetic field with a magnetic field intensity exceeding a predetermined range. A magnetic sensor is equipped with a magnetoresistive effect element (MR element) 11 that can detect an external magnetic field and a soft magnetic body shield 12. The soft magnetic body shield(s) 12 are/is positioned above and/or below the MR element 11 in a side view, and the size of the MR element 11 is physically included within a perimeter of the soft magnetic body shield 12.

公开(公告)号：US20180172782A1

公开(公告)日：2018-06-21

申请号：US15714093

申请日：2017-09-25

Applicant: TDK CORPORATION

Inventor： Masaki NAGATA ,  Kazuya WATANABE ,  Keisuke UCHIDA ,  Kohei HONMA ,  Hiraku HIRABAYASHI

IPC: G01R33/09 ,  G01R33/02

CPC classification number: G01R33/091 ,  G01R33/0206 ,  G01R33/093

Abstract: A magnetic field detection device includes a first soft magnetic body, a second soft magnetic body, and a magnetism detection element. The first soft magnetic body extends to have a first length in a first direction, and has a first width, smaller than the first length, in a second direction. The second direction is substantially orthogonal to the first direction. The second soft magnetic body is disposed to be spaced apart from and face the first soft magnetic body in the first direction, extends to have a second length in the first direction, and has a second width, smaller than the second length, in the second direction. The magnetism detection element is disposed, in the first direction, between the first and second soft magnetic bodies, and extends to have a third length in the first direction and a third width, larger than the third length, in the second direction.

公开(公告)号：US20240192029A1

公开(公告)日：2024-06-13

申请号：US18585959

申请日：2024-02-23

Applicant: TDK Corporation

Inventor： Keisuke UCHIDA ,  Kazuya WATANABE

IPC: G01D5/16 ,  G01R33/00 ,  G01R33/09

CPC classification number: G01D5/16 ,  G01R33/0005 ,  G01R33/09 ,  G01R33/091 ,  G01R33/093 ,  G01R33/098

Abstract: The magnetic sensor of the invention has an element portion that is elongate, that exhibits magnetoresistive effect and that has a magnetically sensitive axis in a direction of a short axis thereof. The element portion is non-oval and can be arranged in an imaginary ellipse, wherein the imaginary ellipse has a major axis that connects both ends of the element portion with regard to a direction of a long axis thereof to each other and a minor axis that connects both ends of the element portion with regard to a direction of the short axis thereof to each other, as viewed in a direction that is perpendicular both to the short axis and to the long axis of the element portion.

公开(公告)号：US20240133715A1

公开(公告)日：2024-04-25

申请号：US18404023

申请日：2024-01-04

Applicant: TDK CORPORATION

Inventor： Keisuke UCHIDA ,  Yongfu CAI

IPC: G01D5/16

CPC classification number: G01D5/16

Abstract: A position detection device includes a magnet that generates a magnetic field to be detected, and a magnetic sensor. The magnetic sensor detects the magnetic field to be detected and generates a detection value corresponding to the position of the magnet. The magnetic field to be detected has a first direction that changes within a first plane, at a reference position in the first plane. The magnetic sensor includes four MR elements. Each of the MR elements includes a first magnetic layer having first magnetization that can change in direction within a second plane corresponding to the each of the MR elements. The first plane and the second plane intersect at a dihedral angle α other than 90°. A detection value depends on the direction of the first magnetization.

公开(公告)号：US20230251333A1

公开(公告)日：2023-08-10

申请号：US18295898

申请日：2023-04-05

Applicant: TDK Corporation

Inventor： Keisuke UCHIDA ,  Hiraku HIRABAYASHI

IPC: G01R33/09

CPC classification number: G01R33/09 ,  G01R33/093 ,  H01F10/3268

Abstract: The magnetic sensor can prevent an increase of a positional detection error of a subject/object even in the case of applying an external magnetic field with a magnetic field intensity exceeding a predetermined range. A magnetic sensor is equipped with a magnetoresistive effect element (MR element) 11 that can detect an external magnetic field and a soft magnetic body shield 12. The soft magnetic body shield(s) 12 are/is positioned above and/or below the MR element 11 in a side view, and the size of the MR element 11 is physically included within a perimeter of the soft magnetic body shield 12.

公开(公告)号：US20220252681A1

公开(公告)日：2022-08-11

申请号：US17729149

申请日：2022-04-26

Applicant: TDK CORPORATION

Inventor： Masaki NAGATA ,  Kazuya WATANABE ,  Keisuke UCHIDA ,  Kohei HONMA ,  Hiraku HIRABAYASHI

IPC: G01R33/00 ,  G01R33/09 ,  G01R33/06

Abstract: A magnetic field detection device, containing a) a first soft magnetic body containing a1) a first plate including a first surface having a first outer edge; and a2) a first protrusion disposed directly or indirectly on the first surface of the first plate at a first arrangement position set back from the first outer edge, the first protrusion including a first tip on an opposite side to the first surface; and b) a magnetic detector provided in a vicinity of the first tip, wherein the magnetic detector has a magnetic sensing direction along the first surface, and the first protrusion is capable of bending a direction of a first magnetic flux, which comes into the first plate, along the first surface.

公开(公告)号：US20220244321A1

公开(公告)日：2022-08-04

申请号：US17722734

申请日：2022-04-18

Applicant: TDK CORPORATION

Inventor： Masaki NAGATA ,  Kazuya WATANABE ,  Keisuke UCHIDA ,  Kohei HONMA ,  Hiraku HIRABAYASHI

IPC: G01R33/00 ,  G01R33/02

Abstract: Provided is a magnetic field detection device that includes a first and second soft magnetic bodies, and a magnetic detector. The first and second soft magnetic bodies extend along a first plane and are disposed in confronted relation in a third direction. The first plane includes both a first direction and a second direction orthogonal to the first direction. The third direction is orthogonal to both the first and second directions. The magnetic detector is provided between the first and second soft magnetic bodies in the third direction.

公开(公告)号：US20210165057A1

公开(公告)日：2021-06-03

申请号：US17171560

申请日：2021-02-09

Applicant: TDK Corporation

Inventor： Keisuke UCHIDA ,  Kazuya WATANABE

IPC: G01R33/09 ,  G01R33/00

Abstract: The magnetic sensor of the invention has an element portion that is elongate, that exhibits magnetoresistive effect and that has a magnetically sensitive axis in a direction of a short axis thereof. The element portion is non-oval and can be arranged in an imaginary ellipse, wherein the imaginary ellipse has a major axis that connects both ends of the element portion with regard to a direction of a long axis thereof to each other and a minor axis that connects both ends of the element portion with regard to a direction of the short axis thereof to each other, as viewed in a direction that is perpendicular both to the short axis and to the long axis of the element portion.

公开(公告)号：US20200300669A1

公开(公告)日：2020-09-24

申请号：US16896379

申请日：2020-06-09

Applicant: TDK CORPORATION

Inventor： Tsuyoshi UMEHARA ,  Keisuke UCHIDA ,  Toshihide SUTO ,  Hiraku HIRABAYASHI

IPC: G01D5/16 ,  G01D5/14

Abstract: A position detection device includes a first magnetic field generation unit for generating a first magnetic field, a second magnetic field generation unit for generating a second magnetic field, and a magnetic sensor. The position of the second magnetic field generation unit relative to the first magnetic field generation unit is variable. The magnetic sensor detects the direction of a target magnetic field at a detection position in a reference plane. The target magnetic field is a composite magnetic field of first and second magnetic field components which are respective components of the first and second magnetic fields parallel to the reference plane. The magnetic sensor includes a magnetoresistive element including a free layer and a magnetization pinned layer. In the reference plane, two directions orthogonal to the magnetization direction of the magnetization pinned layer are each different from both of directions of the first and second magnetic field components.