Patent Document ID: 8879160
Application ID: 13395169
Patent Status: 1

Claim One:
1. An optical device comprising: a deformable membrane including an anchor zone on a support to contribute to trapping a quantity of liquid or gaseous fluid, a central zone to reversibly deform from a rest position, and an intermediate zone between the anchor zone and the central zone; a principal piezoelectric actuator arranged in a first ring in the intermediate zone so as to be mounted around the central zone, the principal piezoelectric actuator including one or more piezoelectric actuator elements; and a supplementary piezoelectric actuator arranged in a second ring shape in the intermediate zone so as to be mounted around the central zone and so as to encircle the principal piezoelectric actuator, the supplementary piezoelectric actuator including one or more piezoelectric actuator elements, wherein the principal piezoelectric actuator is anchored only to the intermediate zone of the membrane, the supplementary piezoelectric actuator is anchored to the intermediate zone and to the support, the principal piezoelectric actuator, the supplementary piezoelectric actuator, and the membrane to which they are anchored form at least a piezoelectric bimorph, the principal piezoelectric actuator and the supplementary piezoelectric actuator are to contract or expand in a radial direction of the rings during actuation so as to generate a displacement of the fluid from the intermediate zone to the central zone of the membrane or vice versa to deform the central zone relative to its rest position, and the principal piezoelectric actuator and the supplementary piezoelectric actuator each act on different portions of the membrane in the radial direction during actuation.