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公开(公告)号：US20220357182A1
公开(公告)日：2022-11-10
申请号：US17865839
申请日：2022-07-15
Applicant: TDK CORPORATION
Inventor： Keisuke UCHIDA , Yongfu CAI
IPC: 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：US20210405133A1
公开(公告)日：2021-12-30
申请号：US17470031
申请日：2021-09-09
Applicant: TDK Corporation
Inventor： Yongfu CAI , Yuta SAITO
Abstract: A magnetic sensor device includes a magnetic field converter that receives an input magnetic field input along a first direction and outputs an output magnetic field along a second direction, which is orthogonal to the first direction. A magnetic field detector is provided at a position where the output magnetic field can be applied. A magnetic shield that blocks an external magnetic field along the second direction. is provided. The magnetic field converter has a shape in which the length in a third direction, which is orthogonal to both the first direction and the second direction, is longer than the length in the second direction, when viewed along the first direction. The magnetic shield is provided at a position overlapping with the magnetic field converter and the magnetic field detector, when viewed along the first direction.
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公开(公告)号：US20210325486A1
公开(公告)日：2021-10-21
申请号：US17203140
申请日：2021-03-16
Applicant: TDK CORPORATION
Inventor： Yongfu CAI
Abstract: A magnetic sensor includes a first resistor having a first resistance and a first correction resistor having a second resistance. The first resistor and the first correction resistor are connected in series. The first resistor is configured so that the first resistance changes periodically as strength of a magnetic field component changes periodically. The first correction resistor is configured so that a change in a sum of the first resistance and the second resistance due to a noise magnetic field is smaller than a change in the first resistance due to the noise magnetic field.
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公开(公告)号：US20210255001A1
公开(公告)日：2021-08-19
申请号：US17148036
申请日：2021-01-13
Applicant: TDK CORPORATION
Inventor： Yongfu CAI
Abstract: A position detection unit includes a magnetic sensor, a first magnetic field generator, and a second magnetic field generator. The first magnetic field generator includes a first magnet and generates a first magnetic field. The first magnet includes a first magnetic material and has a first shape. The second magnetic field generator includes a second magnet, generates a second magnetic field, and is movable along a first direction with respect to the first magnetic field generator and the magnetic sensor. The second magnet includes a second magnetic material and has a second shape. The magnetic sensor generates a detection signal corresponding to the direction of a magnetic field of interest, and detects a positional change of the second magnetic field generator. The magnetic field of interest is a composite of the first magnetic field along a first plane and the second magnetic field along the first plane.
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公开(公告)号：US20210096196A1
公开(公告)日：2021-04-01
申请号：US17034370
申请日：2020-09-28
Applicant: TDK Corporation
Inventor： Yongfu CAI
IPC: G01R33/09
Abstract: A magnetic sensor device includes a magnetic field converter that receives an input magnetic field input along a first direction and outputs an output magnetic field along a second direction, which is orthogonal to the first direction. A magnetic field detector, which is provided at a position where the output magnetic field is applied. A magnetic shield that shields external magnetic fields along a third direction, which is orthogonal to both the first direction and the second direction. When viewed along the first direction, the magnetic field converter has a shape such that the length in the third direction is greatet than the length in the second direction. When viewed along the first direction, the magnetic shield is provided at a position overlapping the magnetic field converter and the magnetic field detector, and the magnetic field transmittance of the external magnetic field is 1-30%.
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Patent Agency Ranking
公开(公告)号：US20200292636A1
公开(公告)日：2020-09-17
申请号：US16577036
申请日：2019-09-20
Applicant: TDK Corporation
Inventor： Naoki OHTA , Yongfu CAI
Abstract: A magnetic sensor device having a spin-valve-type magnetoresistive effect element and capable of stably applying a bias magnetic field on the free layer of the magnetoresistive effect element includes a spin-valve-type magnetoresistive effect element, a substrate on which the magnetoresistive effect element is positioned, a power source that supplies a substantially constant electric current applied on the magnetoresistive effect element, and a magnetic field generator that is connected to the electric current path of the electric current applied on the magnetoresistive effect element in series. The magnetic field generator is provided to be capable of applying a bias magnetic field on at least a portion of the magnetoresistive effect element. The magnetic field generator is close to a portion of the magnetoresistive effect element and is positioned at a different level from the substrate.
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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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28.发明公开公开(公告)号：US20240027548A1
公开(公告)日：2024-01-25
申请号：US18338723
申请日：2023-06-21
Applicant: TDK Corporation
Inventor： Yongfu CAI
CPC classification number: G01R33/093 , G01R33/091 , B60T17/22 , G01D5/145
Abstract: Magnetic sensor 1 has magnetic field detection element 7 that detects a magnetic field that is generated by magnet 2 that rotates about central axis C; and substrate 10 that has first side P1 and second side P2 that is a reverse side of the first side P1, wherein second side P2 includes first slope PK1 that is inclined with respect to first side P1. Magnetic field detection element 7 is provided along first slope PK1. Magnet 2 is separated from central axis C and polarities of magnet 2 alternate in a circumferential direction about central axis C. First side P1 is substantially parallel to central axis C. First slope PK1 is inclined with respect to first side P1 by an average angle of 0. In a plane perpendicular to central axis C, intensity of the magnetic field where magnetic field detection element 7 is positioned changes as magnet 2 rotates, and the relation
(1/Ks)×0.8≤MFR≤(1/Ks)×1.2(Ks=sin θ)
is satisfied, where MFR is a ratio of a maximum value to a minimum value of the intensity of the magnetic field in the plane.-
29.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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公开(公告)号：US20230324478A1
公开(公告)日：2023-10-12
申请号：US18336133
申请日：2023-06-16
Applicant: TDK Corporation
Inventor： Yongfu CAI
CPC classification number: G01R33/098 , G01D5/145
Abstract: A magnetic sensor device includes a magnetic field converter that receives an input magnetic field input along a first direction and outputs an output magnetic field along a second direction, which is orthogonal to the first direction. A magnetic field detector is provided at a position where the output magnetic field is applied. A magnetic shield shields external magnetic fields along a third direction, which is orthogonal to both the first direction and the second direction. When viewed along the first direction, the magnetic field converter has a shape such that the length in the third direction is greater than the length in the second direction. When viewed along the first direction, the magnetic shield is provided at a position overlapping the magnetic field converter and the magnetic field detector, and the magnetic field transmittance of the external magnetic field is 1˜30%.
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