公开(公告)号：US20190195966A1

公开(公告)日：2019-06-27

申请号：US16216082

申请日：2018-12-11

Applicant: TDK Corporation

Inventor： Kazuya WATANABE

IPC: G01R33/09 ,  G11B5/39

CPC classification number: G01R33/091 ,  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.

公开(公告)号：US20170356765A1

公开(公告)日：2017-12-14

申请号：US15609181

申请日：2017-05-31

Applicant: TDK CORPORATION

Inventor： Kazuya WATANABE ,  Hiraku HIRABAYASHI

IPC: G01D5/165

CPC classification number: G01D5/1655 ,  G01D3/10 ,  G01D5/145

Abstract: An angle sensor includes a detection signal generation unit for generating a plurality of detection signals, an angle detection unit for generating a detected angle value by performing an operation using the plural of detection signals, and a condition determination apparatus. The condition determination apparatus includes a determination value generation unit and a determination unit. The determination value generation unit performs an operation using the plurality of detection signals to generate a determination value corresponding to the condition of the angle sensor. The determination value varies depending on an angle to be detected. The determination unit determines whether the angle sensor is in a predetermined condition by determining whether the determination value falls within a determination range. The determination unit varies at least one threshold value that represents at least one end of the determination range.

公开(公告)号：US20170261347A1

公开(公告)日：2017-09-14

申请号：US15409678

申请日：2017-01-19

Applicant: TDK Corporation

Inventor： Masaki NAGATA ,  Kazuya WATANABE

IPC: G01D5/165

CPC classification number: G01D5/165 ,  G01D5/145

Abstract: A rotation angle sensing device is provided with a magnet that has a component with a magnetization vector in a direction orthogonal to a rotary shaft, a magnetic sensor part that outputs a sensor signal, and a rotation angle sensing part that detects a rotation angle of a rotating body based upon the sensor signal; the magnet has first and second surfaces substantially orthogonal to the rotary shaft, and a concave side surface that is continuous throughout all circumferences in the circumferential direction; the magnetic sensor part is placed within the space surrounded by the concave side surface, and at a position where an amplitude of a magnetic field intensity Hr and an amplitude of a magnetic field intensity Hθon the virtual plane are substantially identical to each other, and outputs either the magnetic field intensity Hr or the magnetic field intensity Hθ as the sensor signal.

公开(公告)号：US20170261346A1

公开(公告)日：2017-09-14

申请号：US15439264

申请日：2017-02-22

Applicant: TDK CORPORATION

Inventor： Yohei HIROTA ,  Hiraku HIRABAYASHI ,  Keisuke UCHIDA ,  Kazuya WATANABE

IPC: G01D5/16

CPC classification number: G01D5/16 ,  G01D5/145

Abstract: A displacement detection unit includes a magnet and a magnetic detector. The magnet includes a first magnetic-pole region polarized into a south pole and a second magnetic-pole region polarized into a north pole, and generates a magnetic field around the magnet. The magnetic detector is movable relative to the magnet in a first direction, and detects a change in the magnetic field and thereby detects a displacement of the magnet in the first direction. The magnet includes a transition section in which a ratio of a magnetic volume of the second magnetic-pole region in a second direction to a magnetic volume of the first magnetic-pole region in the second direction gradually varies in the first direction. The second direction is orthogonal to the first direction.

公开(公告)号：US20250007431A1

公开(公告)日：2025-01-02

申请号：US18751396

申请日：2024-06-24

Applicant: TDK CORPORATION

Inventor： Shunji SARUKI ,  Hiraku HIRABAYASHI ,  Kazuya WATANABE

IPC: H02P6/16 ,  G01B7/30 ,  G01D5/16 ,  H02K29/08

Abstract: An angle detection device includes an angle sensor configured to detect a rotating magnetic field that changes periodically in response to a rotation angle of a motor and output a first detection signal and a second detection signal having a phase difference whose value is not an integer multiple of 90°, and a logic signal generation section configured to generate a first logic signal using the first detection signal, generate a second logic signal having a phase different from that of the first logic signal using the second detection signal, and generate a third logic signal having a phase different from those of the first and second logic signals using the first and second logic signals.

公开(公告)号：US20240310460A1

公开(公告)日：2024-09-19

申请号：US18541031

申请日：2023-12-15

Applicant: TDK CORPORATION

Inventor： Takehiro ISODA ,  Norikazu OTA ,  Kazuya WATANABE ,  Hiraku HIRABAYASHI

IPC: G01R33/09 ,  H10N50/01 ,  H10N50/10 ,  H10N50/80

CPC classification number: G01R33/091 ,  G01R33/093 ,  H10N50/01 ,  H10N50/10 ,  H10N50/80

Abstract: A magnetic sensor includes a soft magnetic body having a first end surface and a second end surface located on opposite sides, a first MR element located near the first end surface, a second MR element located near the second end surface, and a first lead that electrically connects the first MR element and the second MR element and includes a portion overlapping the soft magnetic body when observed in a second direction orthogonal to a first direction in which the first and second MR elements are arranged.

公开(公告)号：US20230176147A1

公开(公告)日：2023-06-08

申请号：US17989818

申请日：2022-11-18

Applicant: TDK Corporation

Inventor： Kazuya WATANABE

IPC: G01R33/09 ,  G01R33/00

CPC classification number: G01R33/09 ,  G01R33/0023

Abstract: A magnetic sensor comprises a magnetic detection unit that outputs a signal by applying a magnetic field, and a signal correction unit that corrects the signal output from the magnetic detection unit. The magnetic detection unit includes a magnetoresistive effect element having a predetermined sensitivity axis. The signal correction unit generates a corrected signal by correcting the signal using a correction value capable of reducing the distortion error included in the signal output from the magnetic detection unit when the magnetic field having an intersecting direction that obliquely intersects the sensitivity axis is applied to the magnetoresistive effect element.

公开(公告)号：US20230152396A1

公开(公告)日：2023-05-18

申请号：US17981838

申请日：2022-11-07

Applicant: TDK CORPORATION

Inventor： Kazuya WATANABE ,  Hiraku HIRABAYASHI

IPC: G01R33/09

CPC classification number: G01R33/09

Abstract: An inspection apparatus includes a stage having a placing surface, a first magnetic field generator, and a second magnetic field generator. The first magnetic field generator is configured to be changeable in orientation and to singly generate a first magnetic field. The second magnetic field generator is configured to be changeable in orientation and to singly generate a second magnetic field. The first and second magnetic field generators are configured to cooperatively generate a composite magnetic field in cooperation.

公开(公告)号：US20230092117A1

公开(公告)日：2023-03-23

申请号：US17948789

申请日：2022-09-20

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.

公开(公告)号：US20230088756A1

公开(公告)日：2023-03-23

申请号：US17948429

申请日：2022-09-20

Applicant: TDK CORPORATION

Inventor： Norikazu OTA ,  Shinichirou MOCHIZUKI ,  Kazuya WATANABE ,  Hiraku HIRABAYASHI

IPC: G01R33/00 ,  G01R33/09

Abstract: A magnetic sensor device includes a first detection circuit, a second detection circuit, and a processor. The processor is configured to execute first generation processing for generating a first initial detection value, second generation processing for generating a second initial detection value, first correction processing, second correction processing, and determination processing. The first correction processing is processing for correcting the first initial detection value and updating the first initial detection value. The second correction processing is processing for correcting the second initial detection value and updating the second initial detection value. The processor executes the determination processing after alternately executing the first correction processing and the second correction processing.