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。

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。

公开(公告)号：US06977497B1

公开(公告)日：2005-12-20

申请号：US10990391

申请日：2004-11-18

申请人： Masahiro Yokotani ,  Izuru Shinjo

发明人： Masahiro Yokotani ,  Izuru Shinjo

IPC分类号： G01B7/14 ,  G01B7/30 ,  G01D5/14 ,  G01D5/16 ,  G01P3/54

CPC分类号： G01D5/147

摘要： A magnetoelectric converting element is constructed by four or more magnetic resistance segments symmetrically arranged at a predetermined pitch with respect to the central line of a magnet perpendicular to the rotating direction of a magnetic moving body. The magnetizing direction of the magnet is set to the direction perpendicular to the direction opposed to the magnetic moving body. Further, 0.7P≦X≦P and P≦Y≦1.6P are set when the size of the magnet in the moving direction of the magnetic moving body is set to X and the size of the magnet in the direction opposed to the magnetic moving body is set to Y and the pitch of the magnetic resistance segments at both ends constituting the magnetoelectric converting element is set to P.

摘要翻译： 磁电转换元件由相对于垂直于磁性移动体的旋转方向的磁体的中心线以预定间距对称布置的四个或更多个磁阻部分构成。 磁体的磁化方向被设定为与与磁性移动体相反的方向垂直的方向。 此外，当磁体在磁性移动体的移动方向上的尺寸设定为X并且磁体在相反方向上的尺寸设定为0.7P <= X <= P且P <= Y <= 1.6P 磁体移动体的距离设定为Y，构成磁电转换元件的两端的磁阻段的间距设为P.

公开(公告)号：US06819101B2

公开(公告)日：2004-11-16

申请号：US10422782

申请日：2003-04-25

申请人： Masahiro Yokotani ,  Izuru Shinjo ,  Noriaki Hayashi

发明人： Masahiro Yokotani ,  Izuru Shinjo ,  Noriaki Hayashi

IPC分类号： G01B730

CPC分类号： G01D5/147 ,  G01D5/145 ,  G01P3/487

摘要： A magnetic detector includes a moving body which is multipole-magnetized and which is rotated synchronously with a rotational axis; a magnetic resistance element for detecting a change in magnetic field of the rotating moving body; a processing circuit portion for outputting a signal corresponding to the multipole magnetization of the moving body in accordance with the change in resistance value of the magnetic resistance element due to the change in magnetic field; and a magnet for applying a bias magnetic field to the magnetic resistance element.

摘要翻译： 磁检测器包括多极磁化并与旋转轴线同步旋转的移动体; 用于检测旋转移动体的磁场变化的磁阻元件; 处理电路部分，用于根据磁场变化引起的磁阻元件的电阻值的变化，输出与移动体的多极磁化相对应的信号; 以及用于向磁阻元件施加偏置磁场的磁体。

公开(公告)号：US06246234B1

公开(公告)日：2001-06-12

申请号：US09175413

申请日：1998-10-20

申请人： Masahiro Yokotani ,  Izuru Shinjo ,  Yasuyoshi Hatazawa

发明人： Masahiro Yokotani ,  Izuru Shinjo ,  Yasuyoshi Hatazawa

IPC分类号： G01B730

CPC分类号： B82Y25/00 ,  G01R33/093

摘要： Disclosed is a magnetic detector in which a GMR device is operated within the limited range of a magnetic field so as to optimize a temperature characteristic of changes in resistance value and to improve noise resistance. The magnetic detector comprises a magnet (4) for generating a magnetic field, a rotary member (2) of magnetic material arranged with a predetermined gap left relative to the magnet and provided with projections capable of changing the magnetic field generated by the magnet, and a giant magnetoresistance device (3) of which resistance value is changed depending on the magnetic field changed by the rotary member of magnetic material. The giant magnetoresistance device is arranged to have such a predetermined gap relative to the magnet that the giant magnetoresistance device operates under a magnetic field applied to change in a predetermined amplitude range, e.g., 50˜150 [Oe], where a temperature characteristic of resistance change rate of the giant magnetoresistance device is small.

摘要翻译： 公开了一种磁检测器，其中GMR器件在磁场的有限范围内操作，以便优化电阻值变化的温度特性并改善抗噪声性。 磁检测器包括用于产生磁场的磁体（4），磁性材料的旋转部件（2），相对于磁体布置有预定的间隙，并且具有能够改变由磁体产生的磁场的突起，以及 电阻值根据由磁性材料的旋转构件变化的磁场而变化的巨磁阻装置（3）。 巨磁电阻装置被布置成具有相对于巨磁电阻装置在施加以在预定幅度范围（例如50〜150 [Oe]）改变的磁场下操作的磁体的这样的预定间隙，其中电阻的温度特性 巨磁阻器件的变化率很小。

公开(公告)号：US06937010B1

公开(公告)日：2005-08-30

申请号：US10978466

申请日：2004-11-02

申请人： Akira Takashima ,  Masahiro Yokotani ,  Izuru Shinjo

发明人： Akira Takashima ,  Masahiro Yokotani ,  Izuru Shinjo

IPC分类号： G01R33/09 ,  G01B7/30 ,  G01D5/14 ,  G01D5/16 ,  G01D11/24

CPC分类号： G01D5/147 ,  G01D11/245

摘要： A magnetic detector capable of being easily assembled and diminishing fluctuation in magnetic detection accuracy includes: magnetic resistance elements whose resistance value changes according to change in magnetic field generated by rotation of a multi-polarized rotor; an IC formed by integrating a signal processing circuit section that outputs a signal corresponding to multi-polarization of the rotor based on change in resistance values of the magnetic resistance elements; a lead frame mounted with the IC and connected to an external output terminal for externally outputting an output signal from the signal processing circuit section; a magnet applying a bias magnetic field to the magnetic resistance elements; and a magnetic guide for correcting lines of magnetic force from the magnet. The IC, lead frame and magnetic guide are preliminarily assembled to serve as a first assembly, and the magnet and external output terminal are preliminarily assembled to serve as a second assembly.

摘要翻译： 能够容易地组装和减少磁检测精度波动的磁检测器包括：电阻值随着多极转子旋转产生的磁场变化而变化的磁阻元件; 通过对基于所述磁阻元件的电阻值的变化而输出与所述转子的多极化相对应的信号的信号处理电路部进行积分而形成的IC; 安装有IC并连接到外部输出端子的引线框架，用于从信号处理电路部分外部输出输出信号; 向所述磁阻元件施加偏置磁场的磁体; 以及用于校正来自磁体的磁力线的磁性引导件。 预先组装IC，引线框架和磁性引导件作为第一组件，并且预先组装磁体和外部输出端子用作第二组件。

公开(公告)号：US20050015968A1

公开(公告)日：2005-01-27

申请号：US10704672

申请日：2003-11-12

申请人： Izuru Shinjo ,  Shigeki Tsujii ,  Yoshinori Tatenuma ,  Hiroshi Sakanoue ,  Masahiro Yokotani ,  Ryouichi Sasahara

发明人： Izuru Shinjo ,  Shigeki Tsujii ,  Yoshinori Tatenuma ,  Hiroshi Sakanoue ,  Masahiro Yokotani ,  Ryouichi Sasahara

IPC分类号： G01D5/245 ,  G01D5/14 ,  G01D5/16 ,  G01D5/20 ,  G01D11/24 ,  G01R1/00 ,  G01R33/02 ,  G01R33/09 ,  H01F7/06

CPC分类号： G01D5/147 ,  G01D11/245 ,  Y10T29/49004 ,  Y10T29/49007 ,  Y10T29/4902 ,  Y10T29/49075 ,  Y10T29/49082 ,  Y10T29/49121 ,  Y10T29/49128 ,  Y10T29/49169 ,  Y10T29/5313 ,  Y10T29/53165 ,  Y10T29/53178 ,  Y10T29/53183

摘要： A magnetic detection apparatus can be improved in its product yield. The magnetic detection apparatus includes a resin compact having a the magnet arranged in opposition to an object to be detected for generating a magnetic field, an IC chip with a magnetic detection part built therein for detecting a change in the magnetic field in accordance with movement of the object to be detected, and an IC package in which a lead frame having the IC chip installed thereon is sealed with a resin. A method for manufacturing such a magnetic detection apparatus includes a signal adjustment step for adjusting a signal generated from the magnetic detection part in a state in which the magnetic field is applied to the magnetic detection part to correct a deviation of the signal of the magnetic detection part generated in accordance with a relative displacement between the magnetic detection part and the magnet.

摘要翻译： 可以提高磁性检测装置的产量。 磁检测装置包括具有与要检测的物体相对地布置的用于产生磁场的磁体的树脂压块，其中内置有磁检测部的IC芯片，用于根据磁场检测装置的运动来检测磁场的变化 要检测的对象以及其中安装有IC芯片的引线框用树脂密封的IC封装。 一种用于制造这种磁检测装置的方法包括：信号调整步骤，用于在将磁场施加到磁检测部分的状态下调整从磁检测部分产生的信号，以校正磁检测信号的偏差 根据磁检测部和磁铁之间的相对位移产生的部分。

公开(公告)号：US06577122B2

公开(公告)日：2003-06-10

申请号：US09902721

申请日：2001-07-12

申请人： Masahiro Yokotani ,  Izuru Shinjo ,  Takuji Nada ,  Tatsuya Fukami

发明人： Masahiro Yokotani ,  Izuru Shinjo ,  Takuji Nada ,  Tatsuya Fukami

IPC分类号： G01B730

CPC分类号： G01D5/147 ,  G01B7/003

摘要： A magnetic detection apparatus is able to ensure good performance in detecting the position of an detected portion even with a shift or displacement in the position of a magnetoelectric conversion element. The magnetic detection apparatus includes at least one magnetoelectric conversion element 15 disposed to face one of teeth 12a and grooves 12b of a rotating member 11, a magnet 14 with a direction of magnetization thereof oriented in a direction perpendicular to a radial direction of the rotating member 11 in which the magnet 14 faces the rotating member 11, and a magnetic guide 21 having a first pole projection 21a and a second pole projection 21b formed in a spaced apart relation with respect to each other in a radial direction of the magnetic moving object in which the magnetic guide 21 faces one of the teeth 21a and the grooves 21b of the rotating member 11. The at least one magnetoelectric conversion element is disposed between the first and second pole projections when viewed from a direction perpendicular to the radial direction of the magnetic moving object in which the magnetic guide faces one of the teeth 21a and the grooves 21b of the rotating member 11.

摘要翻译： 磁性检测装置即使在磁电转换元件的位置上的位移偏移也能够确保检测到的部分的位置的良好性能。 磁检测装置包括至少一个面向旋转部件11的齿12a和凹槽12b之一的磁电转换元件15，磁化方向的磁体14沿与旋转部件11的径向垂直的方向 磁体14与旋转构件11对置的磁铁11，以及具有第一磁极突起21a和第二磁极突起21b的导磁体21，该第一磁极突起21a和第二磁极突起21b沿着磁性移动物体的径向彼此间隔开地形成 其中磁导体21面向旋转构件11的齿21a和凹槽21b中的一个。当从与磁体的径向方向垂直的方向观察时，至少一个磁电转换元件设置在第一和第二极突起之间 磁导体面对旋转构件11的齿21a和凹槽21b之一的移动体。

公开(公告)号：US06194893B1

公开(公告)日：2001-02-27

申请号：US09162887

申请日：1998-09-30

申请人： Masahiro Yokotani ,  Yasuyoshi Hatazawa ,  Izuru Shinjo ,  Takuji Nada

发明人： Masahiro Yokotani ,  Yasuyoshi Hatazawa ,  Izuru Shinjo ,  Takuji Nada

IPC分类号： G01B714

CPC分类号： G01R33/09

摘要： A magnetic detector is disclosed with a power-on function which can essentially eliminate temperature characteristics of a magnetic field sensing device and improve edge detecting accuracy of alternately projected and recessed portions of a moving member of magnetic material. The magnetic detector comprises a magnet for generating a magnetic field, a rotary member of magnetic material disposed with a predetermined gap remaining relative to the magnet and having alternately projected and recessed portions to change the magnetic field generated by the magnet, a magnetoresistive device comprising a plurality of magnetic field sensing elements and detecting changes in the magnetic field by movement of the rotary member of magnetic material, and a magnetic guide for adjusting changes in the magnetic field caused by the alternately projected and recessed portions of the rotary member of magnetic material.

摘要翻译： 公开了具有开机功能的磁性检测器，其基本上可以消除磁场感测装置的温度特性，并提高磁性材料的移动部件的交替投影和凹陷部分的边缘检测精度。 磁检测器包括用于产生磁场的磁体，磁性材料的旋转构件，其相对于磁体保留预定间隙，并且具有交替地投影和凹陷部分以改变由磁体产生的磁场;磁阻装置，包括： 多个磁场感测元件，并且通过磁性材料的旋转构件的移动来检测磁场的变化，以及用于调整由磁性材料的旋转构件的交替突出和凹陷部分引起的磁场变化的磁性引导件。

公开(公告)号：US6111403A

公开(公告)日：2000-08-29

申请号：US161675

申请日：1998-09-29

申请人： Masahiro Yokotani ,  Yasuyoshi Hatazawa ,  Izuru Shinjo ,  Takuji Nada

发明人： Masahiro Yokotani ,  Yasuyoshi Hatazawa ,  Izuru Shinjo ,  Takuji Nada

IPC分类号： G01B7/00 ,  G01B7/30 ,  G01D5/245 ,  G01R33/09 ,  G01B7/14

CPC分类号： B82Y25/00 ,  G01R33/093

摘要： A magnetic detector is disclosed with a power-on function which can essentially eliminate temperature characteristics of a magnetic field sensing device and improve edge detecting accuracy of alternately projected and recessed portions of a moving member of magnetic material. The magnetic detector comprises a magnet for generating a magnetic field, a rotary member of magnetic material disposed with a predetermined gap remaining relative to the magnet and having alternately projected and recessed portions to change the magnetic field generated by the magnet, and a magnetoresistive device comprising a plurality of magnetic field sensing elements and detecting changes in the magnetic field by movement of the rotary member of magnetic material. The magnetic flux crosses the plurality of magnetic field sensing elements at a first predetermined angle when the recessed portion of the moving member of magnetic material is opposed to the magnetic field sensing device, and the magnetic flux crosses the plurality of magnetic field sensing elements at a second predetermined angle when the projected portion of the moving member of magnetic material is opposed to the magnetic field sensing device. The first and second predetermined angles are symmetrical with respect to a direction vertical to a plane in which the plurality of magnetic field sensing elements are arranged.

摘要翻译： 公开了具有开机功能的磁性检测器，其基本上可以消除磁场感测装置的温度特性，并提高磁性材料的移动部件的交替投影和凹陷部分的边缘检测精度。 磁检测器包括用于产生磁场的磁体，磁性材料的旋转构件，以相对于磁体残留预定间隙的方式设置，并且具有交替地投影和凹陷部分以改变由磁体产生的磁场;以及磁阻装置，包括 多个磁场感测元件，并且通过磁性材料的旋转构件的移动来检测磁场的变化。 当磁性材料的移动构件的凹部与磁场感测装置相对时，磁通量以第一预定角度与多个磁场感测元件交叉，并且磁通量以一定的角度与多个磁场感测元件交叉 当磁性材料的移动部件的突出部分与磁场感测装置相对时，是第二预定角度。 第一和第二预定角度相对于垂直于布置有多个磁场感测元件的平面的方向对称。