公开(公告)号：US20140292314A1

公开(公告)日：2014-10-02

申请号：US14164776

申请日：2014-01-27

Applicant: TDK CORPORATION

Inventor： Homare TOKIDA ,  Satoshi ABE ,  Hiroshi YAMAZAKI ,  Takahiro IMAI

IPC: G01R33/09 ,  G01B7/14

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。