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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：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
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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Patent Agency Ranking
公开(公告)号：US20210208216A1
公开(公告)日：2021-07-08
申请号：US17212430
申请日：2021-03-25
Applicant: TDK Corporation
Inventor： Yohei HIROTA , Hayato MIYASHITA , Tsuyoshi UMEHARA , Hiraku HIRABAYASHI
IPC: G01R33/09
Abstract: A pair of bias magnets applies a bias magnetic field to the magneto-resistive effect element, the bias magnetic field having a component in a direction such that the component cancels the external magnetic field that is applied to the magneto-resistive effect element and a component that is perpendicular to the external magnetic field. The bias magnet has an elongate cross section in a plane that is parallel both to the external magnetic field and to the bias magnetic field. In a projection plane that is parallel to the cross section and onto which the bias magnets and the magneto-resistive effect element are projected, the bias magnet includes an element facing side that is opposite to the magneto-resistive effect element and that extends in a longitudinal direction. The bias magnet is magnetized in a direction that is perpendicular to the longitudinal direction. The element facing side is longer than other sides.
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公开(公告)号：US20180356473A1
公开(公告)日：2018-12-13
申请号：US15992411
申请日：2018-05-30
Applicant: TDK Corporation
Inventor： Yohei HIROTA , Hayato MIYASHITA , Tsuyoshi UMEHARA , Hiraku HIRABAYASHI
IPC: G01R33/09
CPC classification number: G01R33/093 , G01R33/096 , G01R33/098
Abstract: A pair of bias magnets applies a bias magnetic field to the magneto-resistive effect element, the bias magnetic field having a component in a direction such that the component cancels the external magnetic field that is applied to the magneto-resistive effect element and a component that is perpendicular to the external magnetic field. The bias magnet has an elongate cross section in a plane that is parallel both to the external magnetic field and to the bias magnetic field. In a projection plane that is parallel to the cross section and onto which the bias magnets and the magneto-resistive effect element are projected, the bias magnet includes an element facing side that is opposite to the magneto-resistive effect element and that extends in a longitudinal direction. The bias magnet is magnetized in a direction that is perpendicular to the longitudinal direction. The element facing side is longer than other sides.
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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：US20230074404A1
公开(公告)日：2023-03-09
申请号：US17986136
申请日：2022-11-14
Applicant: TDK Corporation
Inventor： Yohei HIROTA , Hayato MIYASHITA , Tsuyoshi UMEHARA , Hiraku HIRABAYASHI
IPC: G01R33/09
Abstract: A pair of bias magnets applies a bias magnetic field to the magneto-resistive effect element, the bias magnetic field having a component in a direction such that the component cancels the external magnetic field that is applied to the magneto-resistive effect element and a component that is perpendicular to the external magnetic field. The bias magnet has an elongate cross section in a plane that is parallel both to the external magnetic field and to the bias magnetic field. In a projection plane that is parallel to the cross section and onto which the bias magnets and the magneto-resistive effect element are projected, the bias magnet includes an element facing side that is opposite to the magneto-resistive effect element and that extends in a longitudinal direction. The bias magnet is magnetized in a direction that is perpendicular to the longitudinal direction. The element facing side is longer than other sides.
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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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