公开(公告)号：US09244136B2

公开(公告)日：2016-01-26

申请号：US14177602

申请日：2014-02-11

Applicant: TDK CORPORATION

Inventor： Hiroshi Yamazaki ,  Yoshiyuki Mizoguchi ,  Takahiro Imai ,  Satoshi Abe ,  Homare Tokida

IPC: G01R33/09

CPC classification number: G01R33/093 ,  G01R33/098

Abstract: A magnetic sensor includes an MR element and a pair of magnets. The MR element includes a magnetization pinned layer having a magnetization pinned in a direction parallel to an X direction, a free layer having a magnetization that varies depending on an X-direction component of an external magnetic field, and a nonmagnetic layer interposed between the magnetization pinned layer and the free layer. The magnetization pinned layer, the nonmagnetic layer and the free layer are stacked to be adjacent in a Y direction. The free layer receives an interlayer coupling magnetic field in a direction parallel to the X direction resulting from the magnetization pinned layer. The pair of magnets applies a bias magnetic field to the free layer. The bias magnetic field includes a first component in a direction opposite to that of the interlayer coupling magnetic field and a second component in a Z direction.

Abstract translation: 磁传感器包括MR元件和一对磁体。 MR元件包括具有在与X方向平行的方向上固定的磁化的磁化固定层，具有根据外部磁场的X方向分量而变化的磁化的自由层和介于磁化之间的非磁性层 钉扎层和自由层。 磁化钉扎层，非磁性层和自由层在Y方向上堆叠成相邻。 自由层在由磁化固定层产生的与X方向平行的方向上接收层间耦合磁场。 这对磁体对自由层施加偏置磁场。 偏置磁场包括与层间耦合磁场的方向相反的方向的第一分量和Z方向上的第二分量。

公开(公告)号：US09297635B2

公开(公告)日：2016-03-29

申请号：US14164776

申请日：2014-01-27

Applicant: TDK CORPORATION

Inventor： Homare Tokida ,  Satoshi Abe ,  Hiroshi Yamazaki ,  Takahiro Imai

IPC: G01D5/244 ,  G01R35/00 ,  G01B7/14 ,  G01R33/09 ,  G01D5/245

CPC classification number: G01B7/14 ,  G01D5/24461 ,  G01D5/24466 ,  G01D5/2451 ,  G01R33/093

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 disposed at a first position and a second detection circuit disposed at a second position. Each of the first and second detection circuits includes a spin-valve magnetoresistive element. The difference between the first position and the second position in the first direction is smaller than or equal to 1.25% of a one-pitch amount of change in the relative positional relationship between the scale and the magnetic sensor. The computing unit generates an abnormal-event determination signal indicative of the presence of an abnormal event in the magnetic sensor by computation using detection signals from the first and second 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。 磁传感器包括设置在第一位置的第一检测电路和设置在第二位置的第二检测电路。 第一和第二检测电路中的每一个包括自旋阀磁阻元件。 第一方向上的第一位置和第二位置之间的差异小于或等于刻度尺与磁性传感器之间的相对位置关系的单音量变化量的1.25％。 计算单元通过使用来自第一和第二检测电路的检测信号的计算，产生表示磁传感器中存在异常事件的异常事件判定信号。