Sensor element, angular velocity sensor, and multi-axis angular velocity sensor

    公开(公告)号:US11835338B2

    公开(公告)日:2023-12-05

    申请号:US16479442

    申请日:2018-01-22

    Inventor: Munetaka Soejima

    Abstract: A sensor element includes a piezoelectric body, a plurality of excitation electrodes, and a plurality of detecting electrodes. The piezoelectric body includes a frame and a driving arm and detecting arm which extend from the frame within a predetermined plane parallel to an xy plane in an orthogonal coordinate system xyz. The excitation electrodes are located on the driving arm. The detecting electrodes are located on the detecting arm enabling detection of a signal generated by bending deformation of the detecting arm in a z-axis direction. The detecting arm includes first and second arms. The first arm extends from the frame in the predetermined plane. The second arm extends from a front end side of the first arm toward a frame side within the predetermined plane. An end part of the second arm on the frame side is formed as a free end.

    3D MEMS MAGNETOMETER AND ASSOCIATED METHODS
    77.
    发明申请

    公开(公告)号:US20170363694A1

    公开(公告)日:2017-12-21

    申请号:US15534702

    申请日:2015-12-02

    CPC classification number: G01R33/0286 B81B2201/02 G01R33/0206

    Abstract: A micro-electro-mechanical system (MEMS) magnetometer is provided for measuring magnetic field components along three orthogonal axes. The MEMS magnetometer includes a top cap wafer, a bottom cap wafer and a MEMS wafer having opposed top and bottom sides bonded respectively to the top and bottom cap wafers. The MEMS wafer includes a frame structure and current-carrying first, second and third magnetic field transducers. The top cap, bottom cap and MEMS wafer are electrically conductive and stacked along the third axis. The top cap wafer, bottom cap wafer and frame structure together form one or more cavities enclosing the magnetic field transducers. The MEMS magnetometer further includes first, second and third electrode assemblies, the first and second electrode assemblies being formed in the top and/or bottom cap wafers. Each electrode assembly is configured to sense an output of a respective magnetic field transducer induced by a respective magnetic field component.

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