Abstract: A piezoelectric capsule with flat supporting surface and resilient holding means is disclosed, comprising a hollow metal lid (8) fitted on a base body (7) formed of a printed circuit, and a piezoelectric membrane (1) applied against a front step (17) of the lid (8). The resilient holding means (22), fixed to the base body (7), bear on the central zone of the rear face (5) of the membrane (1). The resilient means (22) hodl the membrane (1) mechanically in position and simultaneously provide peripheral sealing by the fact that the corresponding surfaces of the front step (17) and of the membrane (1) are perfectly flat.
Abstract: A piezoelectric insert is provided comprising a membrane (1) formed from a substrate (2) and two piezoelectric material layers (3, 4) whose external surfaces are metallized so as to form the electrodes (5, 6). The membrane comprises a radial excrescence (15) whose upper and lower faces are nipped between the clip shaped legs of connectors (22, 23). The electric connection of the electrodes thus requires no soldering.