Patent ID: 11933968
Assignee: STMICROELECTRONICS S.R.L.
Field: Optics (Instruments)
Classification: CPC G  H | IPC G  H

Claim 11:
12. A pico-projector device, comprising:
a light source driven for generation of a light beam as a function of an image to be generated;
a microelectromechanical (MEMS) structure comprising:
a fixed frame internally defining a cavity;
a mobile mass elastically suspended in the cavity and movable with a first resonant rotational mode about a first rotation axis and with a second resonant rotational mode about a second rotation axis orthogonal to the first rotation axis;
a mirror surface carried by the mobile mass;
a pair of supporting elements extending in the cavity and being rigidly coupled to the fixed frame and elastically deformable to cause rotation of the mobile mass about the first rotation axis;
a pair of elastic-coupling elements elastically coupled between the mobile mass and the pair of supporting elements;
wherein each of said elastic-coupling elements of said pair of elastic-coupling elements comprises a first elastic portion and a second elastic portion, the first elastic portion being compliant to torsion about said second rotation axis; and
wherein the second elastic portion of said elastic-coupling elements of the pair of elastic-coupling elements are compliant to bending outside of a horizontal plane of main extension of said MEMS structure; and

a driving circuit configured to supply electrical driving signals to cause rotation of said mobile mass.