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公开(公告)号：US20180087927A1
公开(公告)日：2018-03-29
申请号：US15705700
申请日：2017-09-15
Applicant: TDK CORPORATION
Inventor： Kenkichi ANAGAWA , Shinichirou MOCHIZUKI , Hiraku HIRABAYASHI , Kazuya WATANABE
IPC: G01D5/16
Abstract: An angle sensor includes a plurality of composite magnetic field information generation units and an angle computing unit. The plurality of composite magnetic field information generation units detect, at a plurality of detection positions, a composite magnetic field of a magnetic field to be detected and a noise magnetic field other than the magnetic field to be detected, and thereby generate a plurality of pieces of composite magnetic field information including information on the direction of the composite magnetic field. The angle computing unit generates a detected angle value by performing an operation using the plurality of pieces of composite magnetic field information so that an error of the detected angle value caused by the noise magnetic field is made smaller than in the case where the detected angle value is generated on the basis of any and only one of the plurality of pieces of composite magnetic field information.
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公开(公告)号：US20170261349A1
公开(公告)日：2017-09-14
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 provoded 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：US20250102324A1
公开(公告)日：2025-03-27
申请号：US18829419
申请日：2024-09-10
Applicant: TDK Corporation
Inventor： Kazuya WATANABE , Hiraku Hirabayashi
Abstract: A magnetic sensor device includes a magnetic sensor and a processor. Each of a plurality of detection circuits of the magnetic sensor includes a magnetoresistive (MR) element. The MR element includes a free layer having a magnetic vortex structure and configured so that the center of the magnetic vortex structure moves depending on a target magnetic field. The plurality of detection circuits are configured to generate a plurality of detection signals each of which changes periodically with periodic changes in the direction of the target magnetic field and whose amplitude changes with a change in the strength of the target magnetic field. The processor is configured to generate an angle detection value and a strength detection value based on the plurality of detection signals.
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公开(公告)号：US20250044383A1
公开(公告)日：2025-02-06
申请号：US18923834
申请日：2024-10-23
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：US20230408605A1
公开(公告)日：2023-12-21
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
CPC classification number: G01R33/093 , G01R33/098
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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Patent Agency Ranking
公开(公告)号：US20210333336A1
公开(公告)日：2021-10-28
申请号：US17366622
申请日：2021-07-02
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：US20210318396A1
公开(公告)日：2021-10-14
申请号：US17355676
申请日：2021-06-23
Applicant: TDK Corporation
Inventor： Naoki OHTA , Kazuya WATANABE
IPC: G01R33/24 , G01R33/038
Abstract: A magnetic sensor includes a base material, a plurality of magnets provided at predetermined spacing on the base material, and a plurality of magnetic detection parts respectively provided close to the plurality of magnets. Each of the plurality of magnetic detection parts outputs a signal in accordance with change in the magnetic field accompanying deformation of the base material.
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公开(公告)号：US20200326390A1
公开(公告)日：2020-10-15
申请号：US16912714
申请日：2020-06-26
Applicant: Asahi Kasei Microdevices Corporation , TDK Corporation
Inventor： Yoshitaka OKUTSU , Masanori YOSHIDA , Kazuhiro ISHIDA , Kazuya WATANABE , Hiraku HIRABAYASHI , Masanori SAKAI
Abstract: An object is to provide a magnetic sensor module that suppresses a size of a magnetic sensor chip while applying a uniform calibration magnetic field to a magneto-resistive element. Provided is a magnetic sensor module comprising an IC chip having a first coil; and a magnetic sensor chip that is disposed on a surface of the IC chip and includes a first magnetic sensor that detects magnetism in a direction of first axis, wherein a planar shape of the IC chip encompasses a planar shape of the magnetic sensor chip, and the first coil has a planar shape including three or more sides, and is, when seen in a cross section along at least one side of the planar shape, is formed so as to cover a region, in a direction of the one side, of the first magnetic sensor.
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公开(公告)号：US20200309871A1
公开(公告)日：2020-10-01
申请号：US16901580
申请日：2020-06-15
Applicant: TDK CORPORATION
Inventor： Kazuya WATANABE , Keisuke UCHIDA , Hiraku HIRABAYASHI
Abstract: An angle sensor includes first and second detection units and an angle detection unit. Each of the first and second detection units generates two detection signals. The first and second detection units are arranged in a positional relationship that establishes predetermined phase relationships among the detection signals they generate. The angle detection unit includes first and second computing circuits and an angle computing unit. The first and second computing circuits generate first and second signals in each of which an error component corresponding to a fifth harmonic contained in the detection signals is reduced. The angle computing unit calculates a detected angle value on the basis of the first and second signals. The angle computing unit performs correction processing for reducing an error occurring in the detected angle value due to an error component corresponding to a third harmonic contained in the detection signals.
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公开(公告)号：US20200292635A1
公开(公告)日：2020-09-17
申请号：US16890242
申请日：2020-06-02
Applicant: TDK CORPORATION
Inventor： Masaki NAGATA , Kazuya WATANABE , Keisuke UCHIDA , Kohei HONMA , Hiraku HIRABAYASHI
Abstract: A magnetic field detection device includes a first soft magnetic body, a second soft magnetic body, and a magnetism detection element. The first soft magnetic body extends to have a first length in a first direction, and has a first width, smaller than the first length, in a second direction. The second direction is substantially orthogonal to the first direction. The second soft magnetic body is disposed to be spaced apart from and face the first soft magnetic body in the first direction, extends to have a second length in the first direction, and has a second width, smaller than the second length, in the second direction. The magnetism detection element is disposed, in the first direction, between the first and second soft magnetic bodies, and extends to have a third length in the first direction and a third width, larger than the third length, in the second direction.
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