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1. 发明授权

US07045997B2 Magnetic detection apparatus 有权
标题翻译：磁检测装置
公开(公告)号：US07045997B2
公开(公告)日：2006-05-16
申请号：US10705959
申请日：2003-11-13
申请人： Masahiro Yokotani , Izuru Shinjo , Naohiro Mishiro , Naoki Hiraoka
发明人： Masahiro Yokotani , Izuru Shinjo , Naohiro Mishiro , Naoki Hiraoka
IPC分类号： G01B7/30
CPC分类号： G01D5/147 , G01D5/24438 , G01R33/09
摘要： A magnetic detection apparatus can accurately detect the rotational position of a magnetic moving member even when intervals between adjacent teeth formed thereon and the circumferential width of each tooth itself are both small and when an opposing distance between the magnetic moving member and first and second magnetoresistive segments is large. A processing circuit is arranged apart from the magnetic moving member on a plane thereof, which is formed on its periphery with the teeth. The processing circuit has a bridge circuit including the first magnetoresistive segment and the second magnetoresistive segment. A magnet applies a magnetic field to the first and second magnetoresistive segments, and to the magnetic moving member in a direction of an axis of rotation thereof. The second magnetoelectric conversion element is arranged substantially on a center line passing through the center of the magnet on a line in opposition to the magnetic moving member when viewed along the direction of the axis of rotation of the magnetic moving member, so that a differential output can be obtained from the outputs of the first magnetoelectric conversion element and the second magnetoelectric conversion element.
摘要翻译：磁性检测装置即使在形成在其上的相邻齿之间的间隔和每个齿本身的周向宽度都小的情况下也可以精确地检测磁性移动构件的旋转位置，并且当磁性移动构件与第一和第二磁阻段之间的相对距离很大处理电路与磁性移动构件在其周边上与齿形成的平面上分开配置。处理电路具有包括第一磁阻部分和第二磁阻部分的桥接电路。磁体将磁场施加到第一和第二磁阻部分，并且在其旋转轴线的方向上对磁性移动部件施加磁场。第二磁电转换元件在沿着磁性移动构件的旋转轴线的方向观察时，基本上布置在与磁性移动构件相对的线上通过磁体中心的中心线上，使得差分输出可以从第一磁电转换元件和第二磁电转换元件的输出获得。

2. 发明授权

US06392407B1 Rotation angle detecting device 有权
标题翻译：旋转角度检测装置
公开(公告)号：US06392407B1
公开(公告)日：2002-05-21
申请号：US09994679
申请日：2001-11-28
申请人： Naohiro Mishiro , Izuru Shinjo , Masahiro Yokotani
发明人： Naohiro Mishiro , Izuru Shinjo , Masahiro Yokotani
IPC分类号： G01B730
CPC分类号： G01D5/145
摘要： In a rotation angle detecting device, a circuit scale thereof is reduced and a manufacturing cost thereof is lowered. The rotation angle detecting device is arranged by comprising: a bridge circuit for converting a magnetic field change of an MR element into a voltage change; a 1st differential amplifying circuit for amplifying the signal outputted from the bridge circuit; an AC coupling circuit for removing a DC component from the output signal of the 1st differential amplifying circuit; a 2nd differential amplifying circuit for amplifying the signal output from the AC coupling circuit; a comparing circuit for comparing the signal outputted from the 2nd differential amplifying circuit with a reference value to thereby output any one of a signal of “0” and a signal of “1”; an output circuit for waveform-shaping the signal outputted from the comparing circuit; and an initiating circuit including a 1st to a 3rd transistors, and a differentiating circuit for driving the 1st to 3rd transistors; in which both the 1st and the 2nd transistors are connected to the AC coupling circuit so as to converge the output signal of the AC coupling circuit into a reference voltage immediately after a power supply is turned ON; and in which the 3rd transistor is connected to the comparing circuit so as to also converge the input signal of the comparing circuit into an AC coupling reference level.
摘要翻译：在旋转角度检测装置中，其电路规模减小，制造成本降低。所述旋转角度检测装置的特征在于包括：用于将MR元件的磁场变化转换为电压变化的桥接电路; 第一差分放大电路，用于放大从桥式电路输出的信号; AC耦合电路，用于从第一差分放大电路的输出信号中去除DC分量; 用于放大从AC耦合电路输出的信号的第二差分放大电路; 比较电路，用于将从第二差分放大电路输出的信号与参考值进行比较，从而输出信号“0”和信号“1”中的任何一个; 用于对从比较电路输出的信号进行波形整形的输出电路; 以及包括第1至第3晶体管的启动电路和用于驱动第1至第3晶体管的微分电路; 其中第一和第二晶体管都连接到AC耦合电路，以便在电源接通之后立即将AC耦合电路的输出信号收敛成参考电压; 并且其中第三晶体管连接到比较电路，以便也将比较电路的输入信号收敛成AC耦合参考电平。

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