公开(公告)号：US10254135B2

公开(公告)日：2019-04-09

申请号：US15181904

申请日：2016-06-14

Applicant: TDK CORPORATION

Inventor： Shinichirou Mochizuki ,  Hiraku Hirabayashi ,  Hiroshi Naganuma ,  Tsuyoshi Umehara ,  Yuichiro Yamaji

IPC: G01D5/14 ,  G01D5/244

Abstract: A correction apparatus for an angle sensor includes a correction information generator for generating correction information, and a correction processing unit for performing correction processing in the course of generation of a detected angle value by an angle detector. Details of the correction processing are determined on the basis of the correction information. The correction information generator includes an error estimate generation unit and a correction information determination unit. The error estimate generation unit generates, on the basis of a first signal and a second signal, an error estimate containing a variable component that varies depending on an ideal angle estimate. The correction information determination unit determines the correction information on the basis of the error estimate.

公开(公告)号：US10006789B2

公开(公告)日：2018-06-26

申请号：US15455548

申请日：2017-03-10

Applicant: TDK CORPORATION

Inventor： Shinichirou Mochizuki ,  Hiraku Hirabayashi ,  Tsuyoshi Umehara ,  Hiroshi Naganuma ,  Kazuya Watanabe

IPC: G01B7/30 ,  G01B7/00 ,  G01R33/025 ,  G01D18/00 ,  G01D5/16

CPC classification number: G01D18/002 ,  G01D5/145 ,  G01D5/16 ,  G01D5/24476

Abstract: A correction apparatus for an angle sensor includes a correction unit for performing first correction processing on a first detection signal and performing second correction processing on a second detection signal. The first correction processing is processing for combining the first detection signal and a first correction value to generate a first corrected detection signal. The second correction processing is processing for combining the second detection signal and a second correction value to generate a second corrected detection signal. The first correction value has a first amplitude and varies with a first period. The second correction value has a second amplitude and varies with a second period. The first and second amplitudes are of the same value. The first and second periods are of the same value equal to ⅓ or ⅕ of the period of an ideal component of each of the first and second detection signals.

公开(公告)号：US12228623B2

公开(公告)日：2025-02-18

申请号：US18172796

申请日：2023-02-22

Applicant: TDK CORPORATION

Inventor： Tsuyoshi Umehara ,  Kentaro Harada ,  Yongfu Cai

IPC: G01R33/09 ,  G01B7/00 ,  G01D5/12

Abstract: In a magnetic sensor, first and second resistors are provided in a path that connects a power supply port and a first output port, and third and fourth resistors are provided in a path that connects a ground port and the first output port. In a direction parallel to an X direction, both of a distance between the first resistor and the second resistor and a distance between the third resistor and the fourth resistor are λ/2, and a distance between the first resistor and the third resistor is zero. A magnetization of a magnetization pinned layer in the first and fourth resistors contains a component in a −X direction. The magnetization of the magnetization pinned layer in the second and third resistors contains a component in the X direction.

公开(公告)号：US11519978B2

公开(公告)日：2022-12-06

申请号：US17212430

申请日：2021-03-25

Applicant: TDK Corporation

Inventor： Yohei Hirota ,  Hayato Miyashita ,  Tsuyoshi Umehara ,  Hiraku Hirabayashi

IPC: G01R33/09

Abstract: A pair of bias magnets applies a bias magnetic field to the magneto-resistive effect element, the bias magnetic field having a component in a direction such that the component cancels the external magnetic field that is applied to the magneto-resistive effect element and a component that is perpendicular to the external magnetic field. The bias magnet has an elongate cross section in a plane that is parallel both to the external magnetic field and to the bias magnetic field. In a projection plane that is parallel to the cross section and onto which the bias magnets and the magneto-resistive effect element are projected, the bias magnet includes an element facing side that is opposite to the magneto-resistive effect element and that extends in a longitudinal direction. The bias magnet is magnetized in a direction that is perpendicular to the longitudinal direction. The element facing side is longer than other sides.

公开(公告)号：US11506733B2

公开(公告)日：2022-11-22

申请号：US17350558

申请日：2021-06-17

Applicant: TDK Corporation

Inventor： Kenichi Takano ,  Tsuyoshi Umehara ,  Yuta Saito ,  Hiraku Hirabayashi

IPC: G01R33/09 ,  G01R33/00

Abstract: A magnetic sensor comprises a magnetoresistive effect element including a first side surface and a second side surface facing in opposite directions along a first axis and a first end surface and a second end surface facing in opposite directions along a second axis substantially orthogonal to the first axis. The sensor has a sensitivity axis extending in a direction of the first axis, a first yoke unit provided adjacent to the first side surface of the magnetoresistive effect element, and a first bias magnetic field generation unit provided adjacent to the first end surface of the magnetoresistive effect element. The first bias magnetic field generation unit is provided to be capable of applying a bias magnetic field on the magnetoresistive effect element and the first yoke unit.

公开(公告)号：US11009567B2

公开(公告)日：2021-05-18

申请号：US15992411

申请日：2018-05-30

Applicant: TDK Corporation

Inventor： Yohei Hirota ,  Hayato Miyashita ,  Tsuyoshi Umehara ,  Hiraku Hirabayashi

IPC: G01R33/09

Abstract: A pair of bias magnets applies a bias magnetic field to the magneto-resistive effect element, the bias magnetic field having a component in a direction such that the component cancels the external magnetic field that is applied to the magneto-resistive effect element and a component that is perpendicular to the external magnetic field. The bias magnet has an elongate cross section in a plane that is parallel both to the external magnetic field and to the bias magnetic field. In a projection plane that is parallel to the cross section and onto which the bias magnets and the magneto-resistive effect element are projected, the bias magnet includes an element facing side that is opposite to the magneto-resistive effect element and that extends in a longitudinal direction. The bias magnet is magnetized in a direction that is perpendicular to the longitudinal direction. The element facing side is longer than other sides.

公开(公告)号：US10830614B2

公开(公告)日：2020-11-10

申请号：US16160144

申请日：2018-10-15

Applicant: TDK CORPORATION

Inventor： Kenzo Makino ,  Tsuyoshi Umehara

IPC: G01D5/16

Abstract: A magnetic sensor generates a detection signal that varies according to the strength of a target magnetic field at a detection position in a reference plane. The magnetic sensor includes a magnetoresistive element. The magnetoresistive element includes a magnetization pinned layer having a magnetization in a first direction, and a free layer having a magnetization whose direction is variable according to the direction of an acting magnetic field, the acting magnetic field being a composite magnetic field of all magnetic fields acting on the free layer. The free layer has uniaxial magnetic anisotropy such that an easy axis of magnetization is oriented in a direction parallel to a second direction. In the reference plane, both of two directions orthogonal to the second direction are different from the direction of the target magnetic field.

公开(公告)号：US20180254686A1

公开(公告)日：2018-09-06

申请号：US15831508

申请日：2017-12-05

Applicant: TDK Corporation

Inventor： Yosuke Komasaki ,  Naoki Ohta ,  Hayato Miyashita ,  Takakazu Imai ,  Hiraku Hirabayashi ,  Masanori Sakai ,  Satoshi Abe ,  Tsuyoshi Umehara

IPC: H02K11/215 ,  H02P6/16 ,  G01R33/09 ,  H01L43/08 ,  G01R15/20

CPC classification number: H02K11/215 ,  G01R15/205 ,  G01R33/091 ,  G01R33/093 ,  H01L27/22 ,  H01L43/08 ,  H02P6/16

Abstract: A magnetic sensor includes a magnetic detection element circuit that includes first and second magnetic detection elements, which are connected in series, and an output terminal, which is positioned between the first and second magnetic detection elements; an impedance matching device, which has a prescribed input voltage range and is connected to an output terminal of the magnetic detection element circuit; a first current supply source, which supplies an electric current to the magnetic detection element circuit; and a second current supply source, which supplies an electric current to the impedance matching device. A resistor is provided between the output terminal of the magnetic detection element circuit and the first current supply source and/or a reference electric potential point.