公开(公告)号：US20200348373A1

公开(公告)日：2020-11-05

申请号：US16916606

申请日：2020-06-30

Applicant: TDK Corporation

Inventor： Kunihiro UEDA ,  Yoshiyuki MIZOGUCHI ,  Hiroshi YAMAZAKI ,  Suguru WATANABE

IPC: G01R33/09

Abstract: A magnetic sensor is provided with first and second magnetoresistive effect elements that can detect an external magnetic field. The first and second magnetoresistive effect elements are a plurality of layers of multilayer body including free layers where their magnetization directions vary due to the external magnetic field. Shapes of the first and second magnetoresistive effect elements viewed from the upper side in the lamination direction are different from each other. The first magnetoresistive effect element has a shape that can increase a slope of an output of the first magnetoresistive effect element relative to the change of the external magnetic field. The second magnetoresistive effect element has a shape that can decrease a slope of an output of the second magnetoresistive effect element relative to the change of the external magnetic field compared to the slope of the output of the first magnetoresistive effect element.

公开(公告)号：US20200209324A1

公开(公告)日：2020-07-02

申请号：US16816685

申请日：2020-03-12

Applicant: TDK CORPORATION

Inventor： Kunihiro UEDA ,  Yoshimitsu WADA ,  Hiraku HIRABAYASHI ,  Kazuma YAMAWAKI ,  Tsuyoshi UMEHARA

IPC: G01R33/00 ,  G01R33/09

Abstract: This sensor unit includes a base having a substantially-rectangular planar shape including a first side and a second side that are substantially orthogonal to each other, and a plurality of first sensors provided on the base and arranged on a first axis. The first axis is substantially parallel to the first side and passes through a center position of the base.

公开(公告)号：US20170219383A1

公开(公告)日：2017-08-03

申请号：US15414247

申请日：2017-01-24

Applicant: TDK CORPORATION

Inventor： Tsuyoshi UMEHARA ,  Hiraku HIRABAYASHI ,  Kunihiro UEDA ,  Keisuke UCHIDA

IPC: G01D5/165 ,  G01P3/44 ,  G01D5/244

CPC classification number: G01D5/165 ,  G01D5/147 ,  G01D5/244 ,  G01D5/2451 ,  G01P3/44 ,  G01P3/481

Abstract: A displacement detection unit includes first and second sensors, an object, and a calculation section. The object includes first and second regions disposed periodically in a first direction, and performs displacement relative to the first and second sensors in the first direction. The first and second sensors detect first and second magnetic field changes in accordance with the displacement of the object and output the detected first and second magnetic field change as first and second signals, respectively. The first and second signals have different phases. The calculation section performs a calculation of an amount of the displacement of the object in the first direction multiple times per one period corresponding to a time period in which the object performs the displacement by an amount of displacement equivalent to a total of a continuous pair of the first and second regions, on a basis of the first and second signals.

公开(公告)号：US20140292313A1

公开(公告)日：2014-10-02

申请号：US14164315

申请日：2014-01-27

Applicant: TDK CORPORATION

Inventor： Kunihiro UEDA ,  Hiraku HIRABAYASHI ,  Satoshi ABE ,  Homare TOKIDA

IPC: G01B7/14

CPC classification number: G01B7/14 ,  G01B7/30

Abstract: 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.

Abstract translation: 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。