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公开(公告)号：US10330747B2
公开(公告)日：2019-06-25
申请号：US15714093
申请日：2017-09-25
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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公开(公告)号：US20240361404A1
公开(公告)日：2024-10-31
申请号：US18768695
申请日：2024-07-10
Applicant: TDK CORPORATION
Inventor： Kazuya Watanabe , Kenzo Makino
CPC classification number: G01R33/093 , G01R33/0005
Abstract: A magnetic sensor includes a substrate including a top surface, an insulating layer including an inclined surface, and a magnetic detection element disposed on the inclined surface. The magnetic detection element includes a first side surface and a second side surface. The first side surface is located at a position forward in a first direction that is one direction along the inclined surface. The second side surface is located at a position forward in a second direction that is another direction along the inclined surface. The magnetic detection element includes a first non-constant portion in which a gap between an upper end of the first side surface and an upper end of the second side surface becomes smaller along the longitudinal direction of the magnetic detection element.
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公开(公告)号：US11782104B2
公开(公告)日：2023-10-10
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
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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公开(公告)号：US11371863B2
公开(公告)日：2022-06-28
申请号：US16876251
申请日：2020-05-18
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：US11340317B2
公开(公告)日：2022-05-24
申请号：US17082496
申请日：2020-10-28
Applicant: TDK CORPORATION
Inventor： Kazuya Watanabe , Hiraku Hirabayashi
Abstract: A magnetic sensor device includes a first magnetic sensor, a second magnetic sensor, and a soft magnetic structure. The first magnetic sensor generates a detection value corresponding to a component in a direction parallel to an X direction of an external magnetic field. The second magnetic sensor generates a detection value corresponding to a component in a direction parallel to a Y direction of the external magnetic field. In the presence of a residual magnetization in the X direction in the soft magnetic structure, a magnetic field that is based on the residual magnetization and contains a component in the −X direction is applied to the first magnetic sensor. In the presence of a residual magnetization in the Y direction in the soft magnetic structure, a magnetic field that is based on the residual magnetization and contains a component in the −Y direction is applied to the second magnetic sensor.
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Patent Agency Ranking
公开(公告)号：US11119162B2
公开(公告)日：2021-09-14
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：US11054283B2
公开(公告)日：2021-07-06
申请号：US16182759
申请日：2018-11-07
Applicant: TDK Corporation
Inventor： Kazuya Watanabe
Abstract: A magnetic sensor according to the invention comprises at least an element portion that is elongate and that has a magnetoresistive effect; and a soft magnetic body that sandwiches the element portion on both sides with regard to a short axis direction of the element portion. A width of at least one of both end portions of the element portion with regard to a long axis direction of the element portion gradually decreases as a distance in the long axis direction from a central portion of the element portion with regard to the long axis direction increases.
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公开(公告)号：US11035914B2
公开(公告)日：2021-06-15
申请号：US16208995
申请日：2018-12-04
Applicant: TDK CORPORATION
Inventor： Kazuya Watanabe
Abstract: A magnetic sensor includes first to third detection units for detecting components in X, Y, and Z directions of an external magnetic field. A reference plane orthogonal to the Z direction includes first to third regions formed by vertically projecting the first to third detection units thereonto. The first region includes two partial regions located on opposite sides of the third region in a direction parallel to a first straight line, and the second region includes two partial regions located on opposite sides of the third region in a direction parallel to a second straight line, the first and second straight lines being two mutually orthogonal straight lines that pass through the centroid of the third region and are perpendicular to the Z direction.
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公开(公告)号：US10921388B2
公开(公告)日：2021-02-16
申请号：US16259091
申请日：2019-01-28
Applicant: TDK CORPORATION
Inventor： Kazuya Watanabe , Hiraku Hirabayashi
Abstract: A magnetic sensor includes first, second, and third detection units for detecting components in X, Y, and Z directions of an external magnetic field. The third detection unit includes a soft magnetic structure. The first detection unit includes a first portion and a second portion. The second detection unit includes a third portion and a fourth portion. The first portion and the fourth portion are located on opposite sides of the third detection unit in the X direction. The second portion and the third portion are located on opposite sides of the third detection unit in the Y direction.
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公开(公告)号：US10852368B2
公开(公告)日：2020-12-01
申请号：US16145867
申请日：2018-09-28
Applicant: TDK CORPORATION
Inventor： Kazuya Watanabe , Hiraku Hirabayashi
Abstract: A magnetic sensor device includes a first magnetic sensor, a second magnetic sensor, and a soft magnetic structure. The first magnetic sensor generates a detection value corresponding to a component in a direction parallel to an X direction of an external magnetic field. The second magnetic sensor generates a detection value corresponding to a component in a direction parallel to a Y direction of the external magnetic field. In the presence of a residual magnetization in the X direction in the soft magnetic structure, a magnetic field that is based on the residual magnetization and contains a component in the −X direction is applied to the first magnetic sensor. In the presence of a residual magnetization in the Y direction in the soft magnetic structure, a magnetic field that is based on the residual magnetization and contains a component in the −Y direction is applied to the second magnetic sensor.
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