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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：US11215478B2
公开(公告)日：2022-01-04
申请号：US17064873
申请日：2020-10-07
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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公开(公告)号：US11953347B2
公开(公告)日：2024-04-09
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：US20230251331A1
公开(公告)日：2023-08-10
申请号：US18180369
申请日：2023-03-08
Applicant: TDK Corporation
Inventor： Kunihiro Ueda , Yoshimitsu Wada , Hiraku Hirabayashi , Kazuma Yamawaki , Tsuyoshi Umehara
CPC classification number: G01R33/0005 , G01R33/09 , G01R33/091 , G01R33/093 , G01R33/0094 , G01R33/096 , G01R33/098 , 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：US11703358B2
公开(公告)日：2023-07-18
申请号：US17713583
申请日：2022-04-05
Applicant: TDK CORPORATION
Inventor： Tsuyoshi Umehara , Hiraku Hirabayashi , Yongfu Cai
CPC classification number: G01D5/16 , G01B7/003 , G01R33/096 , G01R33/098 , G02B7/10
Abstract: A magnetic sensor includes first to fourth resistors, a power supply port, a ground port, a first output port, and a second output port. The first resistor and the second resistor are located in a first region and connected in series via a first connection point connected to the first output port. The third resistor and the fourth resistor are located in a second region and connected in series via a second connection point connected to the second output port, at least a part of the second region being located at a position different from the first region in a direction parallel to an X direction. The first and second resistors are located between the third and fourth resistors in a direction parallel to a Y direction.
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Patent Agency Ranking
公开(公告)号：US11630165B2
公开(公告)日：2023-04-18
申请号：US17703495
申请日：2022-03-24
Applicant: TDK CORPORATION
Inventor： Kunihiro Ueda , Yoshimitsu Wada , Hiraku Hirabayashi , Kazuma Yamawaki , Tsuyoshi Umehara
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：US11408950B2
公开(公告)日：2022-08-09
申请号：US17036104
申请日：2020-09-29
Applicant: TDK Corporation
Inventor： Kentaro Harada , Tsuyoshi Umehara , Kenichi Takano
IPC: G01R33/09
Abstract: A magnetic sensor is provided that can attenuate a magnetic field in a direction that is perpendicular to the magnetic field detecting direction at a higher rate than the magnetic field in the magnetic field detecting direction.
Magnetic sensor 1 has: first soft magnetic layer 3; a pair of second soft magnetic layers 4A, 4B that is positioned at a location that is different from first soft magnetic layer 3 in the Z direction of first soft magnetic layer 3; and magnetic field detecting element 2 that is positioned between first soft magnetic layer 3 and second soft magnetic layers 4A, 4B in the Z direction, wherein magnetic field detecting element 2 has a magnetic field detecting direction that is parallel to a direction in which the pair of second soft magnetic layers 4A, 4B is arranged. As viewed in the Z direction, second soft magnetic layers 4A, 4B are positioned on both sides of a center of first soft magnetic layer 3, and magnetic field detecting element 2 is positioned inside of a periphery of first soft magnetic layer 3.-
公开(公告)号：US10712178B2
公开(公告)日：2020-07-14
申请号：US16123513
申请日：2018-09-06
Applicant: TDK CORPORATION
Inventor： Keisuke Uchida , Tsuyoshi Umehara , 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：US12072399B2
公开(公告)日：2024-08-27
申请号：US18362011
申请日：2023-07-31
Applicant: TDK Corporation
Inventor： Kentaro Harada , Tsuyoshi Umehara , Kenichi Takano
IPC: G01R33/09
CPC classification number: G01R33/098 , G01R33/091
Abstract: A magnetic sensor is provided that can attenuate a magnetic field in a direction that is perpendicular to the magnetic field detecting direction at a higher rate than the magnetic field in the magnetic field detecting direction.
Magnetic sensor 1 has: first soft magnetic layer 3; a pair of second soft magnetic layers 4A, 4B that is positioned at a location that is different from first soft magnetic layer 3 in the Z direction of first soft magnetic layer 3; and magnetic field detecting element 2 that is positioned between first soft magnetic layer 3 and second soft magnetic layers 4A, 4B in the Z direction, wherein magnetic field detecting element 2 has a magnetic field detecting direction that is parallel to a direction in which the pair of second soft magnetic layers 4A, 4B is arranged. As viewed in the Z direction, second soft magnetic layers 4A, 4B are positioned on both sides of a center of first soft magnetic layer 3, and magnetic field detecting element 2 is positioned inside of a periphery of first soft magnetic layer 3.-
公开(公告)号：US11598827B2
公开(公告)日：2023-03-07
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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