公开(公告)号：US20230050532A1

公开(公告)日：2023-02-16

申请号：US17975131

申请日：2022-10-27

Applicant: TDK Corporation

Inventor： Keisuke UCHIDA ,  Kazuya WATANABE

IPC: G01D5/16 ,  G01R33/09 ,  G01R33/00

Abstract: The magnetic sensor of the invention has an element portion that is elongate, that exhibits magnetoresistive effect and that has a magnetically sensitive axis in a direction of a short axis thereof. The element portion is non-oval and can be arranged in an imaginary ellipse, wherein the imaginary ellipse has a major axis that connects both ends of the element portion with regard to a direction of a long axis thereof to each other and a minor axis that connects both ends of the element portion with regard to a direction of the short axis thereof to each other, as viewed in a direction that is perpendicular both to the short axis and to the long axis of the element portion.

公开(公告)号：US20210165056A1

公开(公告)日：2021-06-03

申请号：US17148816

申请日：2021-01-14

Applicant: TDK CORPORATION

Inventor： Kazuya WATANABE ,  Hiraku HIRABAYASHI

IPC: G01R33/02 ,  G01R33/09 ,  H01L43/08

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.

公开(公告)号：US20210041510A1

公开(公告)日：2021-02-11

申请号：US17082496

申请日：2020-10-28

Applicant: TDK CORPORATION

Inventor： Kazuya WATANABE ,  Hiraku HIRABAYASHI

IPC: G01R33/09 ,  B82Y25/00 ,  G01R33/02

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.

公开(公告)号：US20200319264A1

公开(公告)日：2020-10-08

申请号：US16909332

申请日：2020-06-23

Applicant: TDK CORPORATION

Inventor： Masaki NAGATA ,  Kazuya WATANABE ,  Keisuke UCHIDA ,  Kohei HONMA ,  Hiraku HIRABAYASHI

IPC: G01R33/00 ,  G01R33/09 ,  G01R33/06

Abstract: Provided is a magnetic field detection device that includes a first soft magnetic body and a magnetic detector. The first soft magnetic body includes a first plate and a first protrusion. The first plate includes a first surface including a first outer edge. The first protrusion is provided at a first arrangement position in the first surface and includes a first tip on opposite side to the first surface. The first arrangement position is set back from the first outer edge. The magnetic detector is provided in the vicinity of the first tip.

公开(公告)号：US20200284616A1

公开(公告)日：2020-09-10

申请号：US16876251

申请日：2020-05-18

Applicant: TDK Corporation

Inventor： Masaki NAGATA ,  Kazuya WATANABE ,  Hiraku HIRABAYASHI

IPC: G01D5/20 ,  G01D5/14 ,  G01D5/16

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.

公开(公告)号：US20200116527A1

公开(公告)日：2020-04-16

申请号：US16708574

申请日：2019-12-10

Applicant: TDK CORPORATION

Inventor： Kenkichi ANAGAWA ,  Shinichirou MOCHIZUKI ,  Hiraku HIRABAYASHI ,  Kazuya WATANABE

IPC: G01D5/16 ,  G01D5/14 ,  G01D5/244

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.

公开(公告)号：US20200088809A1

公开(公告)日：2020-03-19

申请号：US16692138

申请日：2019-11-22

Applicant: TDK CORPORATION

Inventor： Masaki NAGATA ,  Kazuya WATANABE ,  Keisuke UCHIDA ,  Kohei HONMA ,  Hiraku HIRABAYASHI

IPC: G01R33/00 ,  G01R33/02

Abstract: Provided is a magnetic field detection device that includes a first and second soft magnetic bodies, and a magnetic detector. The first and second soft magnetic bodies extend along a first plane and are disposed in confronted relation in a third direction. The first plane includes both a first direction and a second direction orthogonal to the first direction. The third direction is orthogonal to both the first and second directions. The magnetic detector is provided between the first and second soft magnetic bodies in the third direction.

公开(公告)号：US20190257895A1

公开(公告)日：2019-08-22

申请号：US16403879

申请日：2019-05-06

Applicant: TDK CORPORATION

Inventor： Masaki NAGATA ,  Kazuya WATANABE ,  Keisuke UCHIDA ,  Kohei HONMA ,  Hiraku HIRABAYASHI

IPC: G01R33/09 ,  G01R33/02

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.

公开(公告)号：US20190195969A1

公开(公告)日：2019-06-27

申请号：US16208995

申请日：2018-12-04

Applicant: TDK CORPORATION

Inventor： Kazuya WATANABE

IPC: G01R33/09 ,  H01L43/08 ,  G01R33/02

CPC classification number: G01R33/098 ,  G01R33/0206 ,  G01R33/093 ,  H01L43/08

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.

公开(公告)号：US20180113176A1

公开(公告)日：2018-04-26

申请号：US15688093

申请日：2017-08-28

Applicant: TDK CORPORATION

Inventor： Masaki NAGATA ,  Kazuya WATANABE ,  Keisuke UCHIDA ,  Kohei HONMA ,  Hiraku HIRABAYASHI

IPC: G01R33/00 ,  G01R33/02

Abstract: Provided is a magnetic field detection device that includes a first and second soft magnetic bodies, and a magnetic detector. The first and second soft magnetic bodies extend along a first plane and are disposed in confronted relation in a third direction. The first plane includes both a first direction and a second direction orthogonal to the first direction. The third direction is orthogonal to both the first and second directions. The magnetic detector is provided between the first and second soft magnetic bodies in the third direction.