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公开(公告)号：US20170370747A1
公开(公告)日：2017-12-28
申请号：US15620272
申请日：2017-06-12
Applicant: TDK CORPORATION
Inventor： Keisuke UCHIDA , Kazuya WATANABE , Hiraku HIRABAYASHI
IPC: G01D5/16
Abstract: An angle sensor includes a first to a fourth detection unit and an angle detection unit. Each of the first to the fourth detection unit generates two detection signals. The first to the fourth detection unit are arranged in a positional relationship that establishes predetermined phase relationships among the detection signals they generate. The angle detection unit performs operations using the detection signals to generate a first and a second signal in which an error component corresponding to a fifth or higher-order harmonic and an error component corresponding to a harmonic of the order other than the fifth order are lower than those in the detection signals. The angle detection unit then calculates a detected angle value on the basis of the first and the second signal.
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公开(公告)号：US20250076420A1
公开(公告)日：2025-03-06
申请号：US18810066
申请日：2024-08-20
Applicant: TDK CORPORATION
Inventor： Kazuya WATANABE , Hiraku HIRABAYASHI
IPC: G01R33/09
Abstract: A magnetic sensor includes first to third structural bodies having a structure for a magnetic detection element to detect a target magnetic field at first to third positions away from a reference axis, respectively, and first to third detection circuits including first to third magnetic detection elements, respectively. The second position is a position rotated from the first position by (120+360×m)° circumferentially about the reference axis. The third position is a position rotated from the first position by (240+360×n)° circumferentially about the reference axis.
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公开(公告)号：US20240418804A1
公开(公告)日：2024-12-19
申请号：US18817459
申请日：2024-08-28
Applicant: TDK Corporation
Inventor： Kazuya WATANABE
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：US20240045003A1
公开(公告)日：2024-02-08
申请号：US18360210
申请日：2023-07-27
Applicant: TDK Corporation
Inventor： Kazuya WATANABE
CPC classification number: G01R33/091 , G01R33/0017 , G11B5/398 , G01R33/093 , G01R33/098 , G11B5/3906
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：US20230008088A1
公开(公告)日：2023-01-12
申请号：US17734674
申请日：2022-05-02
Applicant: TDK CORPORATION
Inventor： Norikazu OTA , Hiraku HIRABAYASHI , Kazuma YAMAWAKI , Shuhei MIYAZAKI , Kazuya WATANABE
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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Patent Agency Ranking
公开(公告)号：US20220113359A1
公开(公告)日：2022-04-14
申请号：US17558990
申请日：2021-12-22
Applicant: TDK Corporation
Inventor： Kazuya WATANABE
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：US20200326399A1
公开(公告)日：2020-10-15
申请号：US16912718
申请日：2020-06-26
Applicant: Asahi Kasei Microdevices Corporation , TDK Corporation
Inventor： Masanori YOSHIDA , Yoshitaka OKUTSU , Kazuhiro ISHIDA , Kazuya WATANABE , Hiraku HIRABAYASHI , Masanori SAKAI
Abstract: An object is to provide a magnetic sensor module reducing influence of heat generated from a coil on a magnetic sensor. A conventional method requires, on a magnetic sensor chip, multiple temperature measuring circuits corresponding to multiple magnetic sensors, and many pads for connection to an IC chip. Therefore, the problem is increase in size of the sensor chip mounting the sensors and in manufacturing cost. Provided is a magnetic sensor module comprising an IC chip including a first coil, a first pad connected to one end of the coil, and a second pad to the other end; a magnetic sensor chip disposed on the IC chip's surface, including a first magnetic sensor detecting first axial magnetism; a first external output terminal; a first conductive wire for connecting the first pad and terminal; a second external output terminal; and a second conductive wire for connecting the second pad and terminal.
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公开(公告)号：US20200209327A1
公开(公告)日：2020-07-02
申请号：US16694129
申请日：2019-11-25
Applicant: TDK CORPORATION
Inventor： Hirokazu TAKAHASHI , Kazuya WATANABE
IPC: G01R33/09
Abstract: A magnetic sensor device includes a magnetic sensor, and a soft magnetic structure disposed near the magnetic sensor. The magnetic sensor and the soft magnetic structure are configured so that when an external magnetic field including a detection-target magnetic field is applied to the magnetic sensor, the external magnetic field is also applied to the soft magnetic structure, and when the soft magnetic structure has a magnetization, a magnetic field based on the magnetization of the soft magnetic structure is applied to the magnetic sensor. The soft magnetic structure has a stripe domain structure.
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公开(公告)号：US20200209326A1
公开(公告)日：2020-07-02
申请号：US16695574
申请日：2019-11-26
Applicant: TDK CORPORATION
Inventor： Kazuya WATANABE , Hirokazu TAKAHASHI
IPC: G01R33/09 , G01R33/022
Abstract: A magnetic sensor device includes a magnetic sensor detecting a detection-target magnetic field, and a soft magnetic structure near the sensor. In an orthogonal coordinate system having two orthogonal axes for representing an applied field strength and a magnetization-corresponding value, coordinates representing the applied field strength and the magnetization-corresponding value move along a minor loop not in contact with a major loop as the strength of an external magnetic field including the detection-target magnetic field varies within a variable range, where the applied field strength is a strength of a magnetic field applied to the soft magnetic structure, the magnetization-corresponding value is a value corresponding to magnetization of the soft magnetic structure, and the major loop is, among loops traced by a path of the coordinates as the applied field strength is varied, a loop that is the largest in terms of area of the region enclosed by the loop.
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公开(公告)号：US20190293734A1
公开(公告)日：2019-09-26
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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