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公开(公告)号：US20190128698A1
公开(公告)日：2019-05-02
申请号：US16117778
申请日：2018-08-30
Applicant: TDK CORPORATION
Inventor： Tsuyoshi UMEHARA , Hayato MIYASHITA , Keisuke UCHIDA , Hiraku HIRABAYASHI
IPC: G01D5/16
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：US20190086485A1
公开(公告)日：2019-03-21
申请号：US16053936
申请日：2018-08-03
Applicant: TDK Corporation
Inventor： Keisuke UCHIDA
CPC classification number: G01R33/093 , G01R33/0005 , G01R33/0206 , H01L43/08
Abstract: The invention aims to provide a magnetic sensor that detects a Z-axis magnetic field via a yoke and that enhances the accuracy with which a magnetic field is detected.A magnetic sensor has a first magnetic field detecting element that is arranged in a plane that includes a first direction and a second direction that is perpendicular to the first direction, wherein the first magnetic field detecting element detects a magnetic field in the first direction; and a soft magnetic body that is adjacent to the first magnetic field detecting element in the first direction. L/W is equal to or more than 10, where W is a length of the soft magnetic body in the first direction, and L is a length of the soft magnetic body in the second direction.
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公开(公告)号：US20180274898A1
公开(公告)日：2018-09-27
申请号：US15883226
申请日：2018-01-30
Applicant: TDK Corporation
Inventor： Keisuke UCHIDA , Hiraku HIRABAYASHI
CPC classification number: G01B7/30 , G01D3/02 , G01D5/145 , G01D5/16 , G01D5/24476
Abstract: An angle sensor system includes a magnetic field generation unit for generating a rotating magnetic field, and an angle sensor for detecting the rotating magnetic field to generate a detected angle value. The rotating magnetic field contains first and second magnetic field components orthogonal to each other. Each of the first and second magnetic field components contains an ideal magnetic field component and an error magnetic field component. The error magnetic field component causes an angular error that varies with ½ the predetermined period. The angle sensor includes first and second detection signal generation units. Each of the first and second detection signal generation units includes a magnetic layer whose magnetization direction varies according to the direction of the rotating magnetic field. The magnetic layer is provided with a magnetic anisotropy that is set to reduce the angular error resulting from the error magnetic field component.
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公开(公告)号：US20180274897A1
公开(公告)日：2018-09-27
申请号：US15882144
申请日：2018-01-29
Applicant: TDK CORPORATION
Inventor： Keisuke UCHIDA , Hiraku HIRABAYASHI
CPC classification number: G01B7/30 , G01D3/02 , G01D5/145 , G01D5/24476
Abstract: An angle sensor system includes a magnetic field generation unit for generating a rotating magnetic field, and an angle sensor for detecting the rotating magnetic field to generate a detected angle value. The rotating magnetic field contains first and second magnetic field components orthogonal to each other. Each of the first and second magnetic field components contains an ideal magnetic field component, and an error component corresponding to the fifth harmonic of the ideal magnetic field component. The angle sensor includes first and second detection signal generation units. Each of the first and second detection signal generation units includes a magnetic layer whose magnetization direction varies according to the direction of the rotating magnetic field. The magnetic layer is provided with a magnetic anisotropy that is set to reduce an angular error resulting from the error components of the first and second magnetic field components.
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公开(公告)号：US20250123124A1
公开(公告)日：2025-04-17
申请号：US18999267
申请日：2024-12-23
Applicant: TDK CORPORATION
Inventor： Keisuke UCHIDA , Yongfu CAI
IPC: 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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Patent Agency Ranking
公开(公告)号：US20240027545A1
公开(公告)日：2024-01-25
申请号：US18376958
申请日：2023-10-05
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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公开(公告)号：US20230204689A1
公开(公告)日：2023-06-29
申请号：US18112605
申请日：2023-02-22
Applicant: TDK CORPORATION
Inventor： Keisuke UCHIDA
CPC classification number: G01R33/0206 , G01R33/09 , G01R33/0017
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：US20220357182A1
公开(公告)日：2022-11-10
申请号：US17865839
申请日：2022-07-15
Applicant: TDK CORPORATION
Inventor： Keisuke UCHIDA , Yongfu CAI
IPC: 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：US20220082641A1
公开(公告)日：2022-03-17
申请号：US17536689
申请日：2021-11-29
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.
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公开(公告)号：US20190242691A1
公开(公告)日：2019-08-08
申请号：US16388175
申请日：2019-04-18
Applicant: TDK CORPORATION
Inventor： Keisuke UCHIDA , Hiraku HIRABAYASHI
CPC classification number: G01B7/30 , G01D3/02 , G01D5/145 , G01D5/16 , G01D5/24476
Abstract: An angle sensor system includes a magnetic field generation unit for generating a rotating magnetic field, and an angle sensor for detecting the rotating magnetic field to generate a detected angle value. The rotating magnetic field contains first and second magnetic field components orthogonal to each other. Each of the first and second magnetic field components contains an ideal magnetic field component and an error magnetic field component. The error magnetic field component causes an angular error that varies with ½ the predetermined period. The angle sensor includes first and second detection signal generation units. Each of the first and second detection signal generation units includes a magnetic layer whose magnetization direction varies according to the direction of the rotating magnetic field. The magnetic layer is provided with a magnetic anisotropy that is set to reduce the angular error resulting from the error magnetic field component.
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