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公开(公告)号：US11914008B2
公开(公告)日：2024-02-27
申请号：US18295898
申请日：2023-04-05
Applicant: TDK Corporation
Inventor： Keisuke Uchida , Hiraku Hirabayashi
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.
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公开(公告)号：US11906602B2
公开(公告)日：2024-02-20
申请号：US18112605
申请日：2023-02-22
Applicant: TDK CORPORATION
Inventor： Keisuke Uchida
CPC classification number: G01R33/0206 , G01R33/0017 , 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.
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公开(公告)号：US11674822B2
公开(公告)日：2023-06-13
申请号：US16890284
申请日：2020-06-02
Applicant: TDK CORPORATION
Inventor： Tsuyoshi Umehara , Hayato Miyashita , Keisuke Uchida , Hiraku Hirabayashi
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.
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公开(公告)号：US11002805B2
公开(公告)日：2021-05-11
申请号：US16409006
申请日：2019-05-10
Applicant: TDK CORPORATION
Inventor： Keisuke Uchida
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.
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公开(公告)号：US11333717B2
公开(公告)日：2022-05-17
申请号：US16999523
申请日：2020-08-21
Applicant: TDK CORPORATION
Inventor： Masaki Nagata , Kazuya Watanabe , Keisuke Uchida , Kohei Honma , Hiraku Hirabayashi
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.
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Patent Agency Ranking
公开(公告)号：US11204263B2
公开(公告)日：2021-12-21
申请号：US16896379
申请日：2020-06-09
Applicant: TDK CORPORATION
Inventor： Tsuyoshi Umehara , Keisuke Uchida , Toshihide Suto , Hiraku Hirabayashi
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.
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公开(公告)号：US10712177B2
公开(公告)日：2020-07-14
申请号：US16117778
申请日：2018-08-30
Applicant: TDK CORPORATION
Inventor： Tsuyoshi Umehara , Hayato Miyashita , Keisuke Uchida , Hiraku Hirabayashi
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.
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公开(公告)号：US12253579B2
公开(公告)日：2025-03-18
申请号：US18408835
申请日：2024-01-10
Applicant: TDK CORPORATION
Inventor： Keisuke Uchida
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.
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公开(公告)号：US11898886B2
公开(公告)日：2024-02-13
申请号：US17865839
申请日：2022-07-15
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.
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公开(公告)号：US11808825B2
公开(公告)日：2023-11-07
申请号：US17722734
申请日：2022-04-18
Applicant: TDK CORPORATION
Inventor： Masaki Nagata , Kazuya Watanabe , Keisuke Uchida , Kohei Honma , Hiraku Hirabayashi
CPC classification number: G01R33/0005 , G01R33/0206
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.
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