Microelectromechanical System for Moving a Mechanical Part in Two Opposite Directions

A microelectromechanical system, comprising a support and an actuator, the actuator comprising a drive module comprising:

• a fixed drive portion, mounted fixedly on the support,
• a movable drive portion mounted movably relative to the support, and
• a suspension connecting the movable drive portion to the support, the movable drive portion being able to be moved relative to the fixed drive portion in a first direction, under the influence of an electrostatic force generated by the application of a nonzero voltage between the fixed drive portion and the movable drive portion, the movement of the movable drive portion relative to the fixed drive portion causing an elastic deformation of the suspension, and the movable drive portion being able to be moved relative to the fixed drive portion in a second direction, opposite to the first direction, when the applied voltage decreases, under the influence of an elastic return force generated by the suspension having been deformed elastically, the elastic return force being opposed to the electrostatic force, wherein the actuator also comprises a stop preventing the movement of the first movable portion in the second direction to a rest position in which the elastic force generated by the suspension would be nil.