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21. 发明授权

US11333717B2 Magnetic field detection device 有权
公开(公告)号：US11333717B2
公开(公告)日：2022-05-17
申请号：US16999523
申请日：2020-08-21
申请人： TDK CORPORATION
发明人： Masaki Nagata , Kazuya Watanabe , Keisuke Uchida , Kohei Honma , Hiraku Hirabayashi
IPC分类号： G01R33/00 , G01R33/02
摘要： 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.

22. 发明授权

US11274942B2 Position detection device 有权
公开(公告)号：US11274942B2
公开(公告)日：2022-03-15
申请号：US16887459
申请日：2020-05-29
申请人： TDK CORPORATION
发明人： Yongfu Cai , Hiraku Hirabayashi
IPC分类号： G01D5/16
摘要： A position detection device includes a magnet that generates a magnetic field to be detected, and a magnetic sensor. The magnetic sensor detects the magnetic field to be detected and generates a detection value corresponding to the position of the magnet. The magnetic sensor includes an MR element and a substrate. The substrate includes a main surface. The magnetic field to be detected received by the MR element has a first direction that changes within a first plane. The MR element includes a magnetic layer having first magnetization that can change in direction within a second plane parallel to the main surface. The first plane and the second plane intersect at a dihedral angle α other than 90°. A detection value depends on the direction of the first magnetization.

23. 发明授权

US11243271B2 Magnetic sensor for detecting components of an external magnetic field that are in mutually orthogonal directions 有权
公开(公告)号：US11243271B2
公开(公告)日：2022-02-08
申请号：US17148816
申请日：2021-01-14
申请人： TDK CORPORATION
发明人： Kazuya Watanabe , Hiraku Hirabayashi
IPC分类号： G01R33/09 , G01R33/02 , H01L43/08 , B82Y25/00
摘要： 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.

24. 发明授权

US11204263B2 Position detection device for detecting position of an object moving in a predetermined direction, and a magnetic sensor for use with the position detection device 有权
公开(公告)号：US11204263B2
公开(公告)日：2021-12-21
申请号：US16896379
申请日：2020-06-09
申请人： TDK CORPORATION
发明人： Tsuyoshi Umehara , Keisuke Uchida , Toshihide Suto , Hiraku Hirabayashi
IPC分类号： G01D5/16 , G01D5/14
摘要： A position detection device includes a first magnetic field generation unit for generating a first magnetic field, a second magnetic field generation unit for generating a second magnetic field, and a magnetic sensor. The position of the second magnetic field generation unit relative to the first magnetic field generation unit is variable. The magnetic sensor detects the direction of a target magnetic field at a detection position in a reference plane. The target magnetic field is a composite magnetic field of first and second magnetic field components which are respective components of the first and second magnetic fields parallel to the reference plane. The magnetic sensor includes a magnetoresistive element including a free layer and a magnetization pinned layer. In the reference plane, two directions orthogonal to the magnetization direction of the magnetization pinned layer are each different from both of directions of the first and second magnetic field components.

25. 发明授权

US10746571B2 Condition determination apparatus and method, physical quantity information generation apparatus, and angle sensor 有权
公开(公告)号：US10746571B2
公开(公告)日：2020-08-18
申请号：US15609181
申请日：2017-05-31
申请人： TDK CORPORATION
发明人： Kazuya Watanabe , Hiraku Hirabayashi
IPC分类号： G01D5/165 , G01D3/10 , G01D5/14
摘要： 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.

26. 发明授权

US10712177B2 Position detection device 有权
公开(公告)号：US10712177B2
公开(公告)日：2020-07-14
申请号：US16117778
申请日：2018-08-30
申请人： TDK CORPORATION
发明人： Tsuyoshi Umehara , Hayato Miyashita , Keisuke Uchida , Hiraku Hirabayashi
IPC分类号： G01R33/09 , G01D5/12 , G01D5/16 , G03B3/00 , G03B5/00 , G02B7/00 , G01D5/14
摘要： A position detection device includes a first position detector, a second position detector, and a signal generator. The first position detector includes a first magnetic field generation unit, a second magnetic field generation unit, and a first magnetic sensor. The second position detector includes a third magnetic field generation unit, a fourth magnetic field generation unit, and a second magnetic sensor. The positions of the second and fourth magnetic field generation units vary in response to variations in a detection-target position. The signal generator generates a position detection signal, which is the sum of a first detection signal generated by the first magnetic sensor and a second detection signal generated by the second magnetic sensor. Each of the first and second position detectors includes a bias magnetic field generation unit.

27. 发明授权

US10648787B2 Rotating field sensor 有权
公开(公告)号：US10648787B2
公开(公告)日：2020-05-12
申请号：US16454284
申请日：2019-06-27
申请人： TDK CORPORATION
发明人： Yohei Hirota , Homare Tokida , Hiraku Hirabayashi
IPC分类号： G01B7/30 , G01D5/14 , G01R33/09
摘要： A first, a second, and a third computing circuit respectively generate a first post-computation signal with a second harmonic component reduced as compared with first and second signals, a second post-computation signal with the second harmonic component reduced as compared with third and fourth signals, and a third post-computation signal with the second harmonic component reduced as compared with fifth and sixth signals. A fourth and a fifth computing circuit respectively generate a fourth post-computation signal with a third harmonic component reduced as compared with the first and second post-computation signals, and a fifth post-computation signal with the third harmonic component reduced as compared with the second and third post-computation signals. A sixth computing circuit determines a detected angle value based on the fourth and fifth post-computation signals.

28. 发明申请

US20180356448A1 CURRENT SENSOR 审中-公开
公开(公告)号：US20180356448A1
公开(公告)日：2018-12-13
申请号：US15997986
申请日：2018-06-05
申请人： TDK Corporation
发明人： Yuta Saito , Kenichi Takano , Hiraku Hirabayashi
IPC分类号： G01R15/20 , G01R19/00 , G01R33/09
CPC分类号： G01R15/205 , G01R19/0092 , G01R33/093
摘要： A current sensor has: a magneto-resistive effect element which is arranged near a current line, to which a signal magnetic field is applied, the signal magnetic field being is induced by a current that flows in the current line, and which generates a magneto-resistive change in accordance with a change of the signal magnetic field; cancelling magnetic field generating means that is provided near the magneto-resistive effect element and that generates a cancelling magnetic field that cancels the signal magnetic field; a first soft magnetic body that is provided between the magneto-resistive effect element and the current line; and a pair of second soft magnetic bodies that are provided on both sides of the magneto-resistive effect element with regard to a magnetization detecting direction of the magneto-resistive effect element.

29. 发明授权

US09200884B2 Magnetic sensor system including three detection circuits 有权
标题翻译：磁传感器系统包括三个检测电路
公开(公告)号：US09200884B2
公开(公告)日：2015-12-01
申请号：US14164315
申请日：2014-01-27
申请人： TDK CORPORATION
发明人： Kunihiro Ueda , Hiraku Hirabayashi , Satoshi Abe , Homare Tokida
IPC分类号： G01B7/14 , G01B7/30
CPC分类号： G01B7/14 , G01B7/30
摘要： A magnetic sensor system includes a scale and a magnetic sensor arranged in a relative positional relationship variable in a first direction, and a computing unit. The magnetic sensor includes a first detection circuit, a second detection circuit and a third detection circuit that are disposed at a first position, a second position and a third position, respectively. Each of the first to third detection circuits includes a spin-valve MR element. A difference between two of the first to third positions that are the most distant from each other in a first direction falls within a one-pitch amount of change in the relative positional relationship between the scale and the magnetic sensor. The computing unit generates first and second post-computation signals having mutually different phases by computation using detection signals from the first to third detection circuits.
摘要翻译：磁传感器系统包括在第一方向上以相对位置关系变量布置的刻度尺和磁传感器，以及计算单元。磁传感器包括分别设置在第一位置，第二位置和第三位置的第一检测电路，第二检测电路和第三检测电路。第一至第三检测电路中的每一个包括自旋阀MR元件。在第一方向上彼此最远的第一至第三位置中的两个之间的差异落在刻度尺和磁性传感器之间的相对位置关系的单间距变化量中。计算单元通过使用来自第一至第三检测电路的检测信号的计算产生具有相互不同相位的第一和第二后计算信号。

30. 发明授权

US11965941B2 Magnetic sensor 有权
公开(公告)号：US11965941B2
公开(公告)日：2024-04-23
申请号：US18299475
申请日：2023-04-12
申请人： TDK Corporation
发明人： Yuta Saito , Hiraku Hirabayashi , Yoshihiro Kudo
IPC分类号： G01R33/09
CPC分类号： G01R33/093 , G01R33/098
摘要： A magnetic sensor includes a magnetic sensor chip that includes a magnetoresistive effect element and a sealed part. The magnetoresistive effect element includes a free layer and a pinned layer. The sealed part has a first surface and a second surface, which is opposite the first surface. The shape of the sealed part in the plan view from the first surface side is substantially quadrilateral. The substantially quadrilateral shape has a first side and a second side, which are substantially parallel to each other. In the plan view, from the first surface side of the sealed part, the magnetization direction of the pinned layer, in a state in which the external magnetic field is not applied on the magnetoresistive effect element, is inclined with respect to an approximately straight line found through the least squares method using a plurality of points arbitrarily set on the first side.

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