Patent ID: 8863575

Claim:
A micromechanical structure, comprising: a substrate; a mass having a main extension in a plane suspended above said substrate, the plane having a first direction and a second direction, the mass having: a center line along the first direction; a plurality of first openings; a plurality of second openings separated from the plurality of first openings by the center line, a first one of the plurality of second openings being positioned adjacent to a second one of the plurality of second openings, the first one and the second one of the second openings having a same length in the first direction, a first width of the first one of the second openings being larger than a second width of the second one of the second openings, the first and second width both extending along the second direction, a first portion of the mass separating the first one of the second openings from the second one of the second openings and forming a first mobile electrode; a first pair of fixed electrodes formed on the substrate, the first pair of fixed electrodes configured to extend into the first one of the second openings to interact with the first mobile electrode; coupling elastic elements; anchorages attached to the substrate; elastic anchorage elements; a frame element, elastically coupled to said mass by the coupling elastic elements and coupled to the anchorages by the elastic anchorage elements, said coupling elastic elements and said anchorage elastic elements are configured to enable a first inertial movement of said mass in response to a first external acceleration in the first direction, and to enable a second inertial movement of said mass in response to a second external acceleration in a third direction transverse to said plane.