Patent ID: 8116011

Claim:
An optical device comprising: at least one deformable membrane; a first support; and actuating means for loading the membrane to deform it, the membrane being provided with a anchoring zone for anchoring to the support which surrounds a part of the membrane including a substantially central zone that is reversibly deformable, the support and the membrane contributing to imprison a constant volume of a first fluid in contact with a face of part of the membrane, wherein the actuating means comprises control-activated main actuating means for loading the membrane in a peripheral zone lying between the central zone and the anchoring zone in order to move the peripheral zone of the membrane in a first direction and to move the first fluid towards the central zone and control-activated supplementary actuating means anchored at least to the membrane for loading the membrane in the central zone to move the central zone of the membrane in a second direction, opposite to the first direction.