公开(公告)号：US20190137298A1

公开(公告)日：2019-05-09

申请号：US16182744

申请日：2018-11-07

Applicant: TDK Corporation

Inventor： Keisuke UCHIDA ,  Kazuya WATANABE

IPC: G01D5/16

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 axisthereof 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：US20190128699A1

公开(公告)日：2019-05-02

申请号：US16123513

申请日：2018-09-06

Applicant: TDK CORPORATION

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

IPC: G01D5/16

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.

公开(公告)号：US20180156874A1

公开(公告)日：2018-06-07

申请号：US15686592

申请日：2017-08-25

Applicant: TDK CORPORATION

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

IPC: G01R33/00 ,  G01R33/06

CPC classification number: G01R33/0005 ,  G01R33/06 ,  G01R33/098

Abstract: Provided is a magnetic field detection device that includes a first soft magnetic body and a magnetic detector. The first soft magnetic body includes a first plate and a first protrusion. The first plate includes a first surface including a first outer edge. The first protrusion is provided at a first arrangement position in the first surface and includes a first tip on opposite side to the first surface. The first arrangement position is set back from the first outer edge. The magnetic detector is provided in the vicinity of the first tip.

公开(公告)号：US20170370747A1

公开(公告)日：2017-12-28

申请号：US15620272

申请日：2017-06-12

Applicant: TDK CORPORATION

Inventor： Keisuke UCHIDA ,  Kazuya WATANABE ,  Hiraku HIRABAYASHI

IPC: G01D5/16

Abstract: An angle sensor includes a first to a fourth detection unit and an angle detection unit. Each of the first to the fourth detection unit generates two detection signals. The first to the fourth detection unit are arranged in a positional relationship that establishes predetermined phase relationships among the detection signals they generate. The angle detection unit performs operations using the detection signals to generate a first and a second signal in which an error component corresponding to a fifth or higher-order harmonic and an error component corresponding to a harmonic of the order other than the fifth order are lower than those in the detection signals. The angle detection unit then calculates a detected angle value on the basis of the first and the second signal.

公开(公告)号：US20230050532A1

公开(公告)日：2023-02-16

申请号：US17975131

申请日：2022-10-27

Applicant: TDK Corporation

Inventor： Keisuke UCHIDA ,  Kazuya WATANABE

IPC: G01D5/16 ,  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：US20200319264A1

公开(公告)日：2020-10-08

申请号：US16909332

申请日：2020-06-23

Applicant: TDK CORPORATION

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

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

Abstract: Provided is a magnetic field detection device that includes a first soft magnetic body and a magnetic detector. The first soft magnetic body includes a first plate and a first protrusion. The first plate includes a first surface including a first outer edge. The first protrusion is provided at a first arrangement position in the first surface and includes a first tip on opposite side to the first surface. The first arrangement position is set back from the first outer edge. The magnetic detector is provided in the vicinity of the first tip.

公开(公告)号：US20200292354A1

公开(公告)日：2020-09-17

申请号：US16890284

申请日：2020-06-02

Applicant: TDK CORPORATION

Inventor： Tsuyoshi UMEHARA ,  Hayato MIYASHITA ,  Keisuke UCHIDA ,  Hiraku HIRABAYASHI

IPC: G01D5/16 ,  G03B3/00 ,  G03B5/00 ,  G02B7/00 ,  G01D5/14

Abstract: A position detection device includes a first position detector, a second position detector, and a signal generator. The first position detector includes a first magnetic field generation unit, a second magnetic field generation unit, and a first magnetic sensor. The second position detector includes a third magnetic field generation unit, a fourth magnetic field generation unit, and a second magnetic sensor. The positions of the second and fourth magnetic field generation units vary in response to variations in a detection-target position. The signal generator generates a position detection signal, which is the sum of a first detection signal generated by the first magnetic sensor and a second detection signal generated by the second magnetic sensor. Each of the first and second position detectors includes a bias magnetic field generation unit.

公开(公告)号：US20200088809A1

公开(公告)日：2020-03-19

申请号：US16692138

申请日：2019-11-22

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：US20200064414A1

公开(公告)日：2020-02-27

申请号：US16409006

申请日：2019-05-10

Applicant: TDK CORPORATION

Inventor： Keisuke UCHIDA

IPC: G01R33/02 ,  G01R33/00 ,  G01R33/09

Abstract: A magnetic sensor includes a magnetic field converter, a magnetic field detector, and a plurality of shields aligned in a Y direction. The magnetic field converter includes a plurality of yokes. Each yoke has a shape elongated in the Y direction, and is configured to receive an input magnetic field component in a direction parallel to a Z direction and to output an output magnetic field component in a direction parallel to an X direction. The magnetic field detector includes a plurality of trains of elements. Each train of elements includes a plurality of MR elements that are aligned in the Y direction along one yoke and connected in series. Each shield has such a shape that its maximum dimension in the Y direction is smaller than its maximum dimension in the X direction.

公开(公告)号：US20200057118A1

公开(公告)日：2020-02-20

申请号：US16665185

申请日：2019-10-28

Applicant: TDK Corporation

Inventor： Keisuke UCHIDA ,  Hiraku HIRABAYASHI

IPC: G01R33/09

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.