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公开(公告)号：US20180017634A1
公开(公告)日：2018-01-18
申请号：US15641529
申请日：2017-07-05
Applicant: TDK CORPORATION
Inventor： Kunihiro UEDA , Yoshimitsu WADA , Hiraku HIRABAYASHI , Kazuma YAMAWAKI , Tsuyoshi UMEHARA
CPC classification number: G01R33/0005 , G01R33/0082 , G01R33/0094 , G01R33/09
Abstract: This sensor unit includes a base having a substantially-rectangular planar shape including a first side and a second side that are substantially orthogonal to each other, and a plurality of first sensors provided on the base and arranged on a first axis. The first axis is substantially parallel to the first side and passes through a center position of the base.
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公开(公告)号：US20170314975A1
公开(公告)日：2017-11-02
申请号：US15455548
申请日：2017-03-10
Applicant: TDK CORPORATION
Inventor： Shinichirou MOCHIZUKI , Hiraku HIRABAYASHI , Tsuyoshi UMEHARA , Hiroshi NAGANUMA , Kazuya WATANABE
CPC classification number: G01D18/002 , G01D5/145 , G01D5/16 , G01D5/24476
Abstract: A correction apparatus for an angle sensor includes a correction unit for performing first correction processing on a first detection signal and performing second correction processing on a second detection signal. The first correction processing is processing for combining the first detection signal and a first correction value to generate a first corrected detection signal. The second correction processing is processing for combining the second detection signal and a second correction value to generate a second corrected detection signal. The first correction value has a first amplitude and varies with a first period. The second correction value has a second amplitude and varies with a second period. The first and second amplitudes are of the same value. The first and second periods are of the same value equal to ⅓ or ⅕ of the period of an ideal component of each of the first and second detection signals.
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公开(公告)号：US20250035468A1
公开(公告)日：2025-01-30
申请号：US18917328
申请日：2024-10-16
Applicant: TDK Corporation
Inventor： Yongfu CAI , Tsuyoshi UMEHARA , Takafumi KOBAYASHI
IPC: G01D5/16 , G01D5/14 , G03B30/00 , H02K11/215 , H04N23/54
Abstract: A position detection device includes a magnetic field generator and a magnetic sensor. The magnetic field generator is configured so that a mode of variation in a target magnetic field relative to variation in a position of a key cap varies nonlinearly relative to the variation in the position of the key cap. The magnetic sensor is configured so that a mode of variation in a detection signal relative to the variation in the target magnetic field varies nonlinearly relative to the variation in the target magnetic field.
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公开(公告)号：US20240219484A1
公开(公告)日：2024-07-04
申请号：US18607811
申请日：2024-03-18
Applicant: TDK CORPORATION
Inventor： Kunihiro UEDA , Yoshimitsu WADA , Hiraku HIRABAYASHI , Kazuma YAMAWAKI , Tsuyoshi UMEHARA
CPC classification number: G01R33/0005 , B82Y10/00 , B82Y25/00 , B82Y40/00 , G01R33/0094 , G01R33/09 , G01R33/091 , G01R33/093 , G01R33/096 , G01R33/098 , G01R15/205 , G01R33/0082 , G01R33/07
Abstract: This sensor unit includes a base having a substantially-rectangular planar shape including a first side and a second side that are substantially orthogonal to each other, and a plurality of first sensors provided on the base and arranged on a first axis. The first axis is substantially parallel to the first side and passes through a center position of the base.
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公开(公告)号：US20230176151A1
公开(公告)日：2023-06-08
申请号：US18161964
申请日：2023-01-31
Applicant: TDK Corporation
Inventor： Tsuyoshi UMEHARA , Kentaro HARADA , Takafumi KOBAYASHI
CPC classification number: G01R33/093 , G01R33/0052
Abstract: A method of designing a magnetic sensor that can easily accommodate various design conditions is provided. The method has:
preparing magnetic sensors, wherein, for each magnetic sensor, magnetization directions of the first to fourth magnetically pinned layers form first to fourth angles θ1 to θ4 relative to a specific reference angle, respectively, and θ1=θ3, θ2=θ4, θ1≠θ2, and each magnetic sensor has a value of θ1-θ2 that is different from values of θ1-θ2 of remaining magnetic sensors,
for each magnetic sensor, obtaining a relationship between an angular range of the magnetization direction of the first to fourth magnetically free layers and an output range of the magnetic sensor, wherein the angular range satisfies a specific linear relationship between the magnetization direction and the output of the magnetic sensor, and
selecting a magnetic sensor that satisfies required conditions for the angular range and the output range from among the magnetic sensors.-
Patent Agency Ranking
公开(公告)号：US20220229124A1
公开(公告)日：2022-07-21
申请号：US17543951
申请日：2021-12-07
Applicant: TDK Corporation
Inventor： Tsuyoshi UMEHARA , Kentaro HARADA , Takafumi KOBAYASHI
Abstract: A method of designing a magnetic sensor that can easily accommodate various design conditions is provided. The method has: preparing magnetic sensors, wherein, for each magnetic sensor, magnetization directions of the first to fourth magnetically pinned layers form first to fourth angles θ1 to θ4 relative to a specific reference angle, respectively, and θ1=θ3, θ2=θ4, θ1≠θ2, and each magnetic sensor has a value of θ1-θ2 that is different from values of 01-02 of remaining magnetic sensors, for each magnetic sensor, obtaining a relationship between an angular range of the magnetization direction of the first to fourth magnetically free layers and an output range of the magnetic sensor, wherein the angular range satisfies a specific linear relationship between the magnetization direction and the output of the magnetic sensor, and selecting a magnetic sensor that satisfies required conditions for the angular range and the output range from among the magnetic sensors.
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27.发明申请公开(公告)号：US20220065956A1
公开(公告)日：2022-03-03
申请号：US17350558
申请日：2021-06-17
Applicant: TDK Corporation
Inventor： Kenichi TAKANO , Tsuyoshi UMEHARA , Yuta SAITO , Hiraku HIRABAYASHI
Abstract: A magnetic sensor comprises a magnetoresistive effect element including a first side surface and a second side surface facing in opposite directions along a first axis and a first end surface and a second end surface facing in opposite directions along a second axis substantially orthogonal to the first axis. The sensor has a sensitivity axis extending in a direction of the first axis, a first yoke unit provided adjacent to the first side surface of the magnetoresistive effect element, and a first bias magnetic field generation unit provided adjacent to the first end surface of the magnetoresistive effect element. The first bias magnetic field generation unit is provided to be capable of applying a bias magnetic field on the magnetoresistive effect element and the first yoke unit.
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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：US20200300669A1
公开(公告)日：2020-09-24
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：US20190277660A1
公开(公告)日：2019-09-12
申请号：US16160144
申请日：2018-10-15
Applicant: TDK CORPORATION
Inventor： Kenzo MAKINO , Tsuyoshi UMEHARA
IPC: G01D5/16
Abstract: A magnetic sensor generates a detection signal that varies according to the strength of a target magnetic field at a detection position in a reference plane. The magnetic sensor includes a magnetoresistive element. The magnetoresistive element includes a magnetization pinned layer having a magnetization in a first direction, and a free layer having a magnetization whose direction is variable according to the direction of an acting magnetic field, the acting magnetic field being a composite magnetic field of all magnetic fields acting on the free layer. The free layer has uniaxial magnetic anisotropy such that an easy axis of magnetization is oriented in a direction parallel to a second direction. In the reference plane, both of two directions orthogonal to the second direction are different from the direction of the target magnetic field.
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