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公开(公告)号：US11131727B2
公开(公告)日：2021-09-28
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：US20210096194A1
公开(公告)日：2021-04-01
申请号：US16877801
申请日：2020-05-19
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：US12174045B2
公开(公告)日：2024-12-24
申请号：US17148036
申请日：2021-01-13
Applicant: TDK CORPORATION
Inventor： Yongfu Cai
IPC: G01D5/16 , G01D5/14 , G02B7/04 , H02K11/215 , H02K33/18
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：US11898886B2
公开(公告)日：2024-02-13
申请号：US17865839
申请日：2022-07-15
Applicant: TDK CORPORATION
Inventor： Keisuke Uchida , Yongfu Cai
IPC: G01D5/16
CPC classification number: 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：US20230280419A1
公开(公告)日：2023-09-07
申请号：US18172796
申请日：2023-02-22
Applicant: TDK CORPORATION
Inventor： Tsuyoshi UMEHARA , Kentaro Harada , Yongfu Cai
CPC classification number: G01R33/093 , G01R33/091 , G01D5/12 , G01B7/003
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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Patent Agency Ranking
26.发明授权公开(公告)号：US11747410B2
公开(公告)日：2023-09-05
申请号：US17034370
申请日：2020-09-28
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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公开(公告)号：US11719556B2
公开(公告)日：2023-08-08
申请号：US17114664
申请日：2020-12-08
Applicant: TDK CORPORATION
Inventor： Yongfu Cai
IPC: G01D5/16 , G02B27/64 , G02B7/09 , G03B5/00 , G03B13/36 , G03B30/00 , H04N5/225 , H04N23/54 , G01D5/14 , H02K11/215
CPC classification number: G01D5/16 , G01D5/147 , 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 of a direction of a target magnetic field relative to variations in a position of a lens is such that the direction of the target magnetic field varies nonlinearly relative to the variations in the position of the lens. The magnetic sensor is configured so that a mode of variation of a detection signal relative to variations in the direction of the target magnetic field is such that the detection signal varies nonlinearly relative to the variations in the direction of the target magnetic field.
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公开(公告)号：US11614342B2
公开(公告)日：2023-03-28
申请号：US17387622
申请日：2021-07-28
Applicant: TDK CORPORATION
Inventor： Yongfu Cai
Abstract: A position detection unit includes a magnetic sensor and a first magnetic field generator. The first magnetic field generator is spaced from and opposed to 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 includes N and S poles adjacent to each other along a plane orthogonal to the first-axis direction. The magnetic sensor and the first magnetic field generator are relatively movable with respect to each other along 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 of the first-axis direction and the second-axis direction is different from a position in the third-axis direction of an interface between the N and S poles adjacent to each other in the third-axis direction.
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公开(公告)号：US11493570B2
公开(公告)日：2022-11-08
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：US11486734B2
公开(公告)日：2022-11-01
申请号：US17384939
申请日：2021-07-26
Applicant: TDK CORPORATION
Inventor： Yongfu Cai , Hayato Miyashita , Tsuyoshi Umehara , Yuta Saito
IPC: G01D5/16
Abstract: A magnetic sensor system includes a magnetic field generator and a magnetic sensor. The magnetic sensor includes a plurality of MR elements. The plurality of MR elements are each configured so that a bias magnetic field in a second direction orthogonal to a first direction is applied to a free layer, and to change in resistance with a strength of a magnetic field component. A maximum strength of the magnetic field component applied to each of the MR elements is greater than or equal to 1.2 times the strength of a bias magnetic field.
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