公开(公告)号：US20150130455A1

公开(公告)日：2015-05-14

申请号：US14384666

申请日：2013-01-29

Applicant: Jiangsu Multidimension Technology Co., Ltd

Inventor： Jianmin Bai ,  James Geza Deak ,  Mingfeng Liu ,  Weifeng Shen

IPC: G01R33/09 ,  G01R17/00

CPC classification number: G01R33/098 ,  G01R17/00 ,  G01R33/022 ,  G01R33/09 ,  G01R33/093

Abstract: Disclosed is a magnetoresistive magnetic field gradient sensor, comprising a substrate, a magnetoresistive bridge and a permanent magnet respectively disposed on the substrate; the magnetoresistive bridge comprises two or more magnetoresistive arms; each magnetoresistive arm consists of one or more magnetoresistive elements; each magnetoresistive element is provided with a magnetic pinning layer; the magnetic pinning layers of all the magnetoresistive elements have the same magnetic moment direction; the permanent magnet is disposed adjacent to each magnetoresistive arm to provide a bias field, and to zero the offset of the response curve of the magnetoresistive element; the magnetoresistive gradiometer includes wire bonding pads that can be electrically interconnected using wire bonding to an ASIC or to the lead frame of a semiconductor chip package.

Abstract translation: 公开了一种磁阻磁场梯度传感器，包括分别设置在基板上的基板，磁阻桥和永磁体; 磁阻桥包括两个或更多个磁阻臂; 每个磁阻臂由一个或多个磁阻元件组成; 每个磁阻元件设置有磁性钉扎层; 所有磁阻元件的磁性钉扎层具有相同的磁矩方向; 永磁体被布置成与每个磁阻臂相邻以提供偏置场，并且使磁阻元件的响应曲线的偏移为零; 磁阻梯度计包括可以使用引线键合到ASIC或半导体芯片封装的引线框架的电气互连的引线接合焊盘。

公开(公告)号：US20150145504A1

公开(公告)日：2015-05-28

申请号：US14405736

申请日：2013-06-04

Applicant: Jiangsu Multidimension Technology Co., Ltd

Inventor： Jianmin Bai ,  James Geza Deak ,  Hua lv ,  Weifeng Shen

IPC: G01P3/488 ,  G01D5/14 ,  G01P13/04

CPC classification number: G01P3/488 ,  G01D5/142 ,  G01P3/54 ,  G01P13/045 ,  G01R33/093 ,  G01R33/098

Abstract: The present invention discloses a magnetoresistive gear tooth sensor, which includes a magnetoresistive sensor chip and a permanent magnet. The magnetic sensor chip is comprised of at least one magnetoresistive sensor bridge, and each arm of the sensor bridge has at least one MTJ element group. The magnetoresistive gear tooth sensor has good temperature stability, high sensitivity, low power consumption, good linearity, wide linear range, and a simple structure. Additionally, the magnetoresistive gear tooth sensor has a concave soft ferromagnetic flux concentrator, which can be used to reduce the component of the magnetic field generated by the permanent magnet along the sensing direction of the MTJ sensor elements, enabling a wide linear range. Because it is arranged as a gradiometer, the magnetoresistive gear tooth sensor bridge is not affected by stray magnetic field; it is only affected by the gradient magnetic field generated by gear teeth in response to the permanent magnet bias. The magnetoresistive gear tooth sensor of the present invention is able to detect the position of a specific tooth or a missing tooth of a gear. This magnetoresistive gear tooth sensor is also capable of determining the speed and direction of motion of a gear.

Abstract translation: 本发明公开了一种磁阻齿轮齿传感器，其包括磁阻传感器芯片和永磁体。 磁传感器芯片由至少一个磁阻传感器桥组成，并且传感器桥的每个臂具有至少一个MTJ元件组。 磁阻齿轮齿传感器具有良好的温度稳定性，灵敏度高，功耗低，线性好，线性范围宽，结构简单。 此外，磁阻齿轮齿传感器具有凹软铁磁磁通集中器，其可用于沿着MTJ传感器元件的感测方向减小由永磁体产生的磁场的分量，从而能够实现宽的线性范围。 由于磁阻齿轮齿传感器桥被布置为梯度计，不受杂散磁场的影响; 它只受到由齿轮齿响应于永磁偏压产生的梯度磁场的影响。 本发明的磁阻齿轮齿传感器能够检测齿轮的特定齿或缺齿的位置。 该磁阻齿轮齿传感器还能够确定齿轮的速度和运动方向。

公开(公告)号：US20150091560A1

公开(公告)日：2015-04-02

申请号：US14379706

申请日：2013-02-19

Applicant: Jiangsu Multidimension Technology Co., Ltd.

Inventor： James Geza Deak ,  Insik Jin ,  Weifeng Shen ,  Songsheng Xue

IPC: G01R33/09 ,  H01L43/08

Abstract: The present invention relates to a magnetoresistive sensor for measuring a magnetic field. A calculation of the sensitivity to external magnetic fields is provided, and it is shown to be related to the shape anisotropy of the magnetoresistive sensing elements. Moreover, it is shown that sensitivity may be made highest when the shape of the magnetoresistive element is long parallel to the sensing axis, and a magnetic bias field strong enough to saturate the magnetoresistive element's magnetization, Hcross, is applied perpendicular to the sensing axis. A monolithic permanent magnet is provided to generate the Hcross and it may be applied at an angle in order to counteract non-ideal fields along the sense axis direction. The high sensitivity magnetoresistive element can be used in many electrical form-factors. Six exemplary bridge configurations are described herein.

Abstract translation: 本发明涉及用于测量磁场的磁阻传感器。 提供了对外部磁场的灵敏度的计算，并且显示与磁阻感测元件的形状各向异性有关。 此外，显示出当磁阻元件的形状长于平行于感测轴的情况下，灵敏度可能最高，并且垂直于感测轴施加足以使磁阻元件的磁化Hcross饱和的磁偏置场。 提供单片永磁体以产生Hcross，并且可以以一定角度施加单片永磁体，以抵消沿着感测轴方向的非理想场。 高灵敏度磁阻元件可用于许多电形式。 这里描述了六个示例性的桥结构。

公开(公告)号：US20150294521A1

公开(公告)日：2015-10-15

申请号：US14439981

申请日：2013-10-30

Applicant: JIANGSU MULTIDIMENSION TECHNOLOGY CO., LTD

Inventor： James Geza Deak ,  Mingfeng Liu ,  Jianming Bai ,  Min Zhu

IPC: G07D7/04 ,  G01R33/09

CPC classification number: G07D7/04 ,  G01N27/90 ,  G01R15/20 ,  G01R33/0283 ,  G01R33/09 ,  G01R33/091 ,  G01R33/38 ,  G11C19/085

Abstract: A magnetic currency verification head may include a magnetoresistive sensor chip, and a magnetic bias unit disposed on the side of the magnetoresistive sensor chip away from the detection surface of the magnetic currency verification head, and separated from the magnetoresistive sensor chip; the magnetoresistive sensor chip comprises a gradiometric bridge circuit that includes magnetic sensor elements; the sensitive direction of the magnetic sensor elements is parallel to the detection surface of the magnetic currency verification head; and the magnetic bias unit has a recessed magnetic structure configured such that the magnetic field generated by the magnetic bias unit only has a small magnetic field component in the direction parallel to the detection surface, thereby enabling the magnetic sensor elements to operate in their linear range. As a result, the magnetic currency verification head has high sensitivity and signal-to-noise ratio.

Abstract translation: 磁性体验证头可以包括磁阻传感器芯片和设置在磁阻传感器芯片的离开磁性验证头的检测表面的一侧并与磁阻传感器芯片分离的磁偏置单元; 磁阻传感器芯片包括包括磁传感器元件的梯度电桥电路; 磁性传感器元件的敏感方向与磁性检验头的检测面平行; 并且磁偏置单元具有凹陷磁结构，其被构造成使得由磁偏置单元产生的磁场在与检测表面平行的方向上仅具有小的磁场分量，从而使得磁传感器元件能够在其线性范围内操作 。 结果，磁性货币验证头具有高灵敏度和信噪比。

公开(公告)号：US20140327437A1

公开(公告)日：2014-11-06

申请号：US14368299

申请日：2012-10-30

Applicant: Jiangsu Multidimension Technology Co., Ltd.

Inventor： Liansheng Han ,  Jianmin Bai ,  Wei Li ,  Songsheng Xue

IPC: G01R19/00 ,  G01R33/06

CPC classification number: G01R19/0092 ,  G01R15/205 ,  G01R17/10 ,  G01R19/32 ,  G01R33/06 ,  G01R33/098

Abstract: This patent discloses a current sensor comprising a sensor bridge (14), which consists of several magnetic tunnel junction (MTJ) elements (R11, R12, R21, R22), a MTJ temperature compensation resistor (16), and a current lead (20), which are integrated onto the same chip. The current lead (20) is positioned close to the sensor bridge (14), and it is used to carry the test current (19). A permanent magnet (17) is arranged at the periphery of the MTJ temperature compensation resistor (16). The permanent magnet (17) rigidly aligns the magnetization direction (7) of the free layer of the MTJ temperature compensation resistor (16) anti-parallel to the magnetization direction (8) of a pinning layer; so that the MTJ temperature compensation resistor (16) remains in a high resistance state providing a resistance value that changes as a function of temperature. The sensor bridge (14) is connected in series with the MTJ temperature compensation resistor (16) in order to temperature compensate the sensor bridge (14). A magnetic field (21) generated by the test current (19) produces an output voltage at the output of the temperature compensated sensor bridge that is proportional to the test current value. As a result of this temperature compensated structure, the current sensor has the advantages of high sensitivity, wide linear range, low power consumption, and excellent temperature stability.

Abstract translation: 该专利公开了一种电流传感器，包括传感器桥（14），其由若干磁性隧道结（MTJ）元件（R11，R12，R21，R22），MTJ温度补偿电阻（16）和电流引线 ），它们集成到同一个芯片上。 电流引线（20）位于传感器桥（14）附近，用于承载测试电流（19）。 永磁体（17）布置在MTJ温度补偿电阻器（16）的外围。 永磁体（17）使与MTJ温度补偿电阻器（16）的自由层的磁化方向（7）刚性对准，该磁化方向与销钉层的磁化方向（8）反平行; 使得MTJ温度补偿电阻器（16）保持在高电阻状态，提供随温度变化的电阻值。 传感器桥（14）与MTJ温度补偿电阻（16）串联连接，以便对传感器桥（14）进行温度补偿。 由测试电流（19）产生的磁场（21）在温度补偿传感器桥的输出处产生与测试电流值成比例的输出电压。 作为该温度补偿结构的结果，电流传感器具有灵敏度高，线性范围宽，功耗低，温度稳定性优异的优点。