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公开(公告)号：US20230258473A1
公开(公告)日：2023-08-17
申请号：US18140094
申请日：2023-04-27
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：US20210231752A1
公开(公告)日：2021-07-29
申请号：US17227779
申请日：2021-04-12
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：US20200309871A1
公开(公告)日：2020-10-01
申请号：US16901580
申请日：2020-06-15
Applicant: TDK CORPORATION
Inventor： Kazuya WATANABE , Keisuke UCHIDA , Hiraku HIRABAYASHI
Abstract: An angle sensor includes first and second detection units and an angle detection unit. Each of the first and second detection units generates two detection signals. The first and second detection units are arranged in a positional relationship that establishes predetermined phase relationships among the detection signals they generate. The angle detection unit includes first and second computing circuits and an angle computing unit. The first and second computing circuits generate first and second signals in each of which an error component corresponding to a fifth harmonic contained in the detection signals is reduced. The angle computing unit calculates a detected angle value on the basis of the first and second signals. The angle computing unit performs correction processing for reducing an error occurring in the detected angle value due to an error component corresponding to a third harmonic contained in the detection signals.
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公开(公告)号：US20200292635A1
公开(公告)日：2020-09-17
申请号：US16890242
申请日：2020-06-02
Applicant: TDK CORPORATION
Inventor： Masaki NAGATA , Kazuya WATANABE , Keisuke UCHIDA , Kohei HONMA , Hiraku HIRABAYASHI
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.
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公开(公告)号：US20180275217A1
公开(公告)日：2018-09-27
申请号：US15891576
申请日：2018-02-08
Applicant: TDK CORPORATION
Inventor： Keisuke UCHIDA , Kenzo MAKINO , Hiraku HIRABAYASHI
CPC classification number: G01R33/093 , G01R33/07 , G01R33/09 , G01R33/091 , G01R33/096 , G01R33/098 , H01L43/08
Abstract: A magnetic sensor includes a magnetic field conversion unit and a magnetic field detection unit. The magnetic field conversion unit receives an input magnetic field containing an input magnetic field component in a direction parallel to Z direction, and generates an output magnetic field containing an output magnetic field component in a direction parallel to X direction. The magnetic field detection unit receives the output magmetic field and generates an output signal corresponding to the input magnetic field component. The magnetic field detection unit includes first and second magnetic detection elements. When misalignment occurs between the magnetic field conversion unit and the magnetic field detection unit, one of the strength of a portion of the output magnetic field component that the first magnetic detection element receives and the strength of a portion of the output magnetic field component that the second magnetic detection element receives increases while the other decreases.
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Patent Agency Ranking
公开(公告)号：US20180274945A1
公开(公告)日：2018-09-27
申请号：US15892875
申请日：2018-02-09
Applicant: TDK CORPORATION
Inventor： Keisuke UCHIDA , Hiraku HIRABAYASHI
IPC: G01D5/14
CPC classification number: G01D5/145
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 relative position of the second magnetic field generation unit with respect to the first magnetic field generation unit is variable. The magnetic sensor detects a composite magnetic field of the first and second magnetic fields, and generates a detection signal corresponding to the direction of the detected magnetic field. Varying the relative position of the second magnetic field generation unit with respect to the first magnetic field generation unit varies the strength of the second magnetic field at the detection position. At the detection position, a relative angle formed by the direction of the second magnetic field with the direction of the first magnetic field is greater than 90° and smaller than 180°.
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公开(公告)号：US20170261346A1
公开(公告)日：2017-09-14
申请号：US15439264
申请日：2017-02-22
Applicant: TDK CORPORATION
Inventor： Yohei HIROTA , Hiraku HIRABAYASHI , Keisuke UCHIDA , Kazuya WATANABE
IPC: G01D5/16
Abstract: A displacement detection unit includes a magnet and a magnetic detector. The magnet includes a first magnetic-pole region polarized into a south pole and a second magnetic-pole region polarized into a north pole, and generates a magnetic field around the magnet. The magnetic detector is movable relative to the magnet in a first direction, and detects a change in the magnetic field and thereby detects a displacement of the magnet in the first direction. The magnet includes a transition section in which a ratio of a magnetic volume of the second magnetic-pole region in a second direction to a magnetic volume of the first magnetic-pole region in the second direction gradually varies in the first direction. The second direction is orthogonal to the first direction.
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公开(公告)号：US20240230376A9
公开(公告)日：2024-07-11
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.
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公开(公告)号：US20240210213A1
公开(公告)日：2024-06-27
申请号：US18597013
申请日：2024-03-06
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：US20240142548A1
公开(公告)日：2024-05-02
申请号：US18408835
申请日：2024-01-10
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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