Patent ID: 7077007

Claim:
A microelectromechanical device comprising: a substrate having a cavity, a floor of the cavity, and a rim surrounding the cavity; a proof mass supported within the cavity so as to have an axis of rotation perpendicular to the substrate; first fingers cantilevered radially outward from the proof mass toward the rim; second fingers cantilevered radially inward from the rim toward the proof mass and interdigitized with the first fingers; and tethers interconnecting the proof mass and the rim; wherein the microelectromechanical device further comprises a plurality of stiction bumps located on the floor of the cavity beneath the proof mass, and a stiction bump on at least one of the second fingers facing a corresponding one of the first fingers; wherein the proof mass surrounds a hub on the floor of the cavity and has a peripheral region adjacent the first fingers, and wherein a first of the plurality of stiction bumps on the floor of the cavity surround the hub, a second of the plurality of stiction bumps on the floor of the cavity are directly beneath the peripheral region of the proof mass, and an annular-shaped central region of the cavity is free of stiction bumps.