Variable resonant frequency electromechanical device and associated acoustic device

Abstract

An electromechanical device includes at least one movable mechanical structure including at least one movable mechanical element; for each movable mechanical element of each movable mechanical structure a first piezoelectric layer, the first layer being disposed on a first part of the movable element so as to be able to actuate the movable mechanical element, and a second piezoelectric layer, the second layer being disposed on a second part of the movable element, distinct from the first part, so as to be able to convert mechanical energy associated with the movement of the movable mechanical element into electric energy, the layer forming a capacitance; the device further including an electrical circuit connected to the second piezoelectric layer in parallel with the capacitance formed by the layer and including an adjustable capacitance which can assume a negative value.

Dependencies are inferred from the claim text.