Patent ID: 9134337
Filing Date: 2015-09-15
Classification: B81B,B81C,G01P,Y10T

Abstract:
1. A microelectromechanical structure comprising: a sensor substrate; a proof mass suspended above the sensor substrate via at least one elastic element, the proof mass displacing and titling in response to acceleration of the structure; a cap substrate coupled to the sensor substrate, the cap substrate being bonded to the sensor substrate to form a cavity that encloses the proof mass, the cap substrate further comprising a plurality of shock stoppers that are arranged above the proof mass to push back the proof mass at specific locations upon a shock load; and a plurality of balance stoppers coupled underneath the proof mass, each of the plurality of balance stoppers being arranged according to a position of one of the plurality of shock stoppers and electrically driven by a balance voltage, each of the plurality of balance stoppers generating first electrostatic force and torque on the proof mass to balance second force and torque generated by a corresponding shock stopper.