Patent ID: 11953813
Assignee: STMICROELECTRONICS S.R.L.
Field: Optics (Instruments)
Classification: CPC B  G | IPC B  G

Claim 16:
17. A microelectromechanical device, comprising:
a fixed structure defining a cavity;
a tiltable structure elastically suspended in the cavity with a main extension in a horizontal plane;
a piezoelectrically driven actuation structure interposed between the tiltable structure and the fixed structure and configured to rotate the tiltable structure about a first rotation axis parallel to a first horizontal axis;
wherein the piezoelectrically driven actuation structure includes a first pair of driving arms with piezoelectric material, elastically coupled to the tiltable structure on opposite sides of the first rotation axis by decoupling elastic elements that are stiff with respect to out-of-plane movements and compliant with respect to torsional movements about the first rotation axis;
the tiltable structure being elastically coupled to the fixed structure at the first rotation axis by elastic suspension elements which are stiff with respect to out-of-plane movements and compliant with respect to torsional movements about the first rotation axis;
the fixed structure forming a frame surrounding the cavity, with first and second supporting elements extending longitudinally along the first rotation axis within the cavity;
elastic suspension elements extending between the tiltable structure and the first and second supporting elements; and
a first lever mechanism coupled between the first supporting element and a first driving arm, the first lever mechanism comprising a lever arm, a torsional elastic element, and a coupling element with a first pair of piezoresistors forming a piezoresistive sensor.