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公开(公告)号：US12204003B2
公开(公告)日：2025-01-21
申请号：US17955819
申请日：2022-09-29
Applicant: TDK CORPORATION
Inventor： Daichi Takano , Norikazu Ota , Hiraku Hirabayashi , Kazuya Watanabe
Abstract: An MR element includes a first magnetic layer, a second magnetic layer, and a nonmagnetic layer disposed between the first magnetic layer and the second magnetic layer. The first magnetic layer has a magnetic shape anisotropy set in a first reference direction, and has a magnetization whose direction changes depending on an external magnetic field, the magnetization being oriented in a first magnetization direction in a state where the external magnetic field is not applied. The second magnetic layer has a magnetic shape anisotropy set in a second reference direction, and has a magnetization whose direction changes depending on the external magnetic field, the magnetization being oriented in a second magnetization direction in a state where the external magnetic field is not applied.
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公开(公告)号：US12153104B2
公开(公告)日：2024-11-26
申请号：US17948789
申请日：2022-09-20
Applicant: TDK CORPORATION
Inventor： Tetsuya Hiraki , Kazuya Watanabe
IPC: G01R33/09
Abstract: A magnetic sensor 1 includes a plurality of MR elements disposed in first to fourth areas. Each of the first to fourth areas includes a first end edge and a second end edge located at both ends in a first reference direction, and a third end edge and a fourth end edge located at both ends in a second reference direction. Each of the first and second end edges extends along the second reference direction. Each of the third and fourth end edges extends along a third reference direction. Each of the plurality of MR elements has a shape long in a direction different from each of the first reference direction, the second reference direction, and the third reference direction.
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公开(公告)号：US12105165B2
公开(公告)日：2024-10-01
申请号：US18360210
申请日：2023-07-27
Applicant: TDK Corporation
Inventor： Kazuya Watanabe
CPC classification number: G01R33/091 , G01R33/0017 , G01R33/093 , G01R33/098 , G11B5/3906 , G11B5/398
Abstract: A magnetic sensor of the present invention has an elongate element portion having a magnetoresistive effect and a pair of elongate soft magnetic bodies that are arranged along the element portion on both sides of the element portion with regard to a short axis thereof. Each soft magnetic body includes a central portion that is adjacent to the element portion from one end to another end of the element portion with regard to a long axis direction thereof and a pair of end portions that protrude from the central portion in the long axis direction. A width of at least one of the end portions gradually decreases in a direction away from the central portion in at least a part of the end portions in the long axis direction thereof.
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公开(公告)号：US11946989B2
公开(公告)日：2024-04-02
申请号：US18197913
申请日：2023-05-16
Applicant: TDK CORPORATION
Inventor： Norikazu Ota , Hiraku Hirabayashi , Kazuma Yamawaki , Shuhei Miyazaki , Kazuya Watanabe
CPC classification number: G01R33/098 , G01R33/0206 , G01R33/093
Abstract: A magnetic sensor device includes at least one magnetic sensor and a support. A center of gravity of an element layout area of the at least one magnetic sensor is deviated from a center of gravity of a reference plane of the support. The at least one magnetic sensor includes four resistor sections constituted by a plurality of magnetoresistive elements. Magnetization of a free layer in each of two of the resistor sections includes a component in a third magnetization direction. The magnetization of a free layer in each of the other two resistor sections includes a component in a fourth magnetization direction opposite to the third magnetization direction.
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公开(公告)号：US11598653B2
公开(公告)日：2023-03-07
申请号：US17825715
申请日：2022-05-26
Applicant: TDK Corporation
Inventor： Masaki Nagata , Kazuya Watanabe , Hiraku Hirabayashi
Abstract: A rotational angle detection apparatus is provided with a magnet disposed so as to be rotatable integrally with an axis of rotation, having a substantially circular shape when viewed along the axis of rotation, and including a magnetization vector component in a direction orthogonal to the axis of rotation; a magnetic sensor that outputs a sensor signal on the basis of change in a magnetic field accompanying rotation of the magnet; and a rotational angle detector that detects a rotational angle of the rotating body on the basis of the sensor signal output by the magnetic sensor; wherein the magnet has a curved inclined surface with a concave shape along the axis of rotation from a prescribed position on the outer side in a radial direction toward the axis of rotation, and when a circular virtual plane orthogonal to the axis of rotation and centered at the axis of rotation is established at a position opposed to the curved inclined surface, the magnetic sensor is disposed at a position at which the amplitudes of a magnetic field intensity Hr in a radial direction and a magnetic field intensity Hθ in a circumferential direction on the virtual plane are substantially the same, and the magnetic field intensities Hr and Hθ in the radial direction and/or the circumferential direction is output as the sensor signal.
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Patent Agency Ranking
公开(公告)号：US10976383B2
公开(公告)日：2021-04-13
申请号：US16587299
申请日：2019-09-30
Applicant: TDK CORPORATION , ASAHI KASEI MICRODEVICES CORPORATION
Inventor： Kazuya Watanabe , Yoshitaka Okutsu , Masanori Yoshida
Abstract: A magnetic sensor device includes three magnetic sensors for detecting components of an external magnetic field that are in three directions, a magnetic field generation section, and a correction processor. The magnetic field generation section generates additional magnetic field components in three directions used for measurements of main- and cross-axis sensitivities of the three magnetic sensors. The correction processor corrects respective detection signals of the three magnetic sensors on the basis of the measurement results of the main- and cross-axis sensitivities of the magnetic sensors.
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公开(公告)号：US10697801B2
公开(公告)日：2020-06-30
申请号：US15450273
申请日：2017-03-06
Applicant: TDK Corporation
Inventor： Masaki Nagata , Kazuya Watanabe , Hiraku Hirabayashi
Abstract: A rotational angle detection apparatus is provided with a magnet disposed so as to be rotatable integrally with an axis of rotation, having a substantially circular shape when viewed along the axis of rotation, and including a magnetization vector component in a direction orthogonal to the axis of rotation; a magnetic sensor that outputs a sensor signal on the basis of change in a magnetic field accompanying rotation of the magnet; and a rotational angle detector that detects a rotational angle of the rotating body on the basis of the sensor signal output by the magnetic sensor; wherein the magnet has a curved inclined surface with a concave shape along the axis of rotation from a prescribed position on the outer side in a radial direction toward the axis of rotation, and when a circular virtual plane orthogonal to the axis of rotation and centered at the axis of rotation is established at a position opposed to the curved inclined surface, the magnetic sensor is disposed at a position at which the amplitudes of a magnetic field intensity Hr in a radial direction and a magnetic field intensity Hθ in a circumferential direction on the virtual plane are substantially the same, and the magnetic field intensities Hr and Hθ in the radial direction and/or the circumferential direction is output as the sensor signal.
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公开(公告)号：US10352728B2
公开(公告)日：2019-07-16
申请号：US15602808
申请日：2017-05-23
Applicant: TDK CORPORATION
Inventor： Kazuya Watanabe , Hiraku Hirabayashi
Abstract: An angle sensor includes a detection signal generation unit for generating detection signals, and an angle detection unit for generating a detected angle value on the basis of the detection signals. The angle detection unit includes a signal conversion unit for performing a conversion operation, and an angle operation unit for performing an angle operation. The conversion operation is to convert the detection signals into first and second operation signals. The angle operation is to calculate the detected angle value using the first and second operation signals. The conversion operation includes an operation using a correction-term-containing function which contains a correction term for reducing a first error or a second error occurring in the detected angle value. When the angle to be detected varies with a predetermined period, the first error varies with the predetermined period, whereas the second error varies with a period ½ the predetermined period.
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公开(公告)号：US12204004B2
公开(公告)日：2025-01-21
申请号：US18240671
申请日：2023-08-31
Applicant: TDK CORPORATION
Inventor： Yoshiaki Tanaka , Tetsuya Hiraki , Kazuya Watanabe , Suguru Watanabe
IPC: G01R33/09
Abstract: A magnetic field detection device includes a base, a first yoke, and a magneto-resistive effect element. The first yoke is provided on the base, and includes first and second principal surfaces each extending along a first plane, and a first end surface coupling the first and second principal surfaces. The magneto-resistive effect element is provided on the base, and includes a magnetization free layer disposed at a position overlapped with the first yoke in a first direction along the first plane. The first end surface includes an inverted tapered surface inclined relative to the first plane and extending closer to a center point of the magnetization free layer as being away from the base in a second direction orthogonal to the first plane. A distance from the center point to a first edge is shorter than a distance from the center point to a second edge.
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公开(公告)号：US11686788B2
公开(公告)日：2023-06-27
申请号：US17734674
申请日：2022-05-02
Applicant: TDK CORPORATION
Inventor： Norikazu Ota , Hiraku Hirabayashi , Kazuma Yamawaki , Shuhei Miyazaki , Kazuya Watanabe
CPC classification number: G01R33/098 , G01R33/0206 , G01R33/093
Abstract: A magnetic sensor device includes at least one magnetic sensor and a support. A center of gravity of an element layout area of the at least one magnetic sensor is deviated from a center of gravity of a reference plane of the support. The at least one magnetic sensor includes four resistor sections constituted by a plurality of magnetoresistive elements. Magnetization of a free layer in each of two of the resistor sections includes a component in a third magnetization direction. The magnetization of a free layer in each of the other two resistor sections includes a component in a fourth magnetization direction opposite to the third magnetization direction.
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