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公开(公告)号：US20240377484A1
公开(公告)日：2024-11-14
申请号：US18781504
申请日：2024-07-23
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：US20220128345A1
公开(公告)日：2022-04-28
申请号：US17502724
申请日：2021-10-15
Applicant: TDK Corporation
Inventor： Kentaro HARADA , Tsuyoshi UMEHARA
Abstract: Magnetic sensor assembly 1 has first member 10 having first to third magnetic sensors 13A to 13C, and second member 20 having first to third magnets 22A to 22C. Second member 20 can be moved in X and Y directions and can be rotated about a Z axis relative to first member 10. Output of first to third magnetic sensors 13A to 13C monotonously changes. A change of the output of first magnetic sensor and a change of the output of second magnetic sensor are different from each other. First to third magnets are positioned on first to third straight lines L1 to L3. A first angle that is formed between first straight line L1 and X axis, a second angle that is formed between second straight line L2 and X axis, and a third angle that is formed between third straight line L3 and Y axis are same.
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公开(公告)号：US20210123992A1
公开(公告)日：2021-04-29
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：US20250155529A1
公开(公告)日：2025-05-15
申请号：US19021619
申请日：2025-01-15
Applicant: TDK Corporation
Inventor： Tsuyoshi UMEHARA , Kentaro HARADA , Yongfu CAI
Abstract: In a magnetic sensor, first and second resistors are provided in a path that connects a power supply port and a first output port, and third and fourth resistors are provided in a path that connects a ground port and the first output port. In a direction parallel to an X direction, both of a distance between the first resistor and the second resistor and a distance between the third resistor and the fourth resistor are λ/2, and a distance between the first resistor and the third resistor is zero. A magnetization of a magnetization pinned layer in the first and fourth resistors contains a component in a −X direction. The magnetization of the magnetization pinned layer in the second and third resistors contains a component in the X direction.
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5.发明公开公开(公告)号：US20230350062A1
公开(公告)日：2023-11-02
申请号：US17730747
申请日：2022-04-27
Applicant: TDK CORPORATION
Inventor： Yongfu CAI , Kentaro HARADA
CPC classification number: G01S17/08 , G01D5/145 , G01D5/16 , G01S7/4817 , G01B7/30
Abstract: A position detection device includes a magnetic sensor and a first magnetic field generator. The first magnetic field generator is disposed to be spaced from and face the magnetic sensor in a first-axis direction, includes a first multipolar magnet, and generates a first magnetic field to be exerted on the magnetic sensor, the first multipolar magnet including N poles and S poles, the N and S poles being adjacent in the first-axis direction. The magnetic sensor and the first magnetic field generator are provided to be relatively movable with respect to each other in a second-axis direction orthogonal to the first-axis direction. A center position of the magnetic sensor in a third-axis direction orthogonal to both the first-axis direction and the second-axis direction is different from a center position of the first multipolar magnet in the third-axis direction.
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Patent Agency Ranking
公开(公告)号：US20220334201A1
公开(公告)日：2022-10-20
申请号：US17852956
申请日：2022-06-29
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：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.-
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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公开(公告)号：US20240397218A1
公开(公告)日：2024-11-28
申请号：US18666103
申请日：2024-05-16
Applicant: TDK CORPORATION
Inventor： Kentaro HARADA
Abstract: A position detection device includes: a first magnetic field generator generating a first magnetic field; a driver opposed to the first magnetic field generator in a first-axis direction; and a magnetic field sensor detecting the first magnetic field. The driver causes the first magnetic field generator to move in a second-axis direction parallel to a first plane orthogonal to the first-axis direction. The first magnetic field generator is movable in the second-axis direction with respect to the driver and the magnetic field sensor. The driver is spaced from and overlaps a part of the first magnetic field generator in the first-axis direction, and extends across the part of the first magnetic field generator in a third-axis direction parallel to the first plane and orthogonal to the second-axis direction. A center position of the magnetic field sensor in the third-axis direction is different from that of the first magnetic field generator.
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公开(公告)号：US20230384401A1
公开(公告)日：2023-11-30
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.
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