Patent ID: 8661900

Claim:
A microelectromechanical device, comprising: a substrate; elastic suspension elements; a mobile mass, suspended above the substrate via the elastic suspension elements and configured to be rotated about said elastic suspension elements; a cover structure arranged above said mobile mass and having an internal surface facing said mobile mass; and a stopper structure arranged at said internal surface of said cover structure and extending from the internal surface towards said mobile mass, the stopper structure being configured to stop a movement of said mobile mass away from said substrate along an axis (z) transverse to said substrate, said stopper structure having tapered sides that extend from the internal surface towards a lower surface of the stopper structure, the tapered sides being configured to partially overlap edges of said mobile mass and configured to reduce an effect of a reciprocal electrostatic interaction, the lower surface of the stopper structure does not overlap the edges of the mobile mass.