Element and the devices of transducers electroacoustic a bimorph of the polymer piezoelectric in particular for the embodiment of a high - loudspeaker a radiation pattern of linear type.

摘要

The invention supplies a novel electroacoustic transducer element, capable of exhibiting an impedance value of the same order as that of conventional loudspeakers (typically 4 to 8 Ohm), allowing direct matching to the elements of a sound reproduction system (amplifier, filters, etc.). The element consists of two symmetric quadrangular membranes (11, 12), arranged face to face, two opposite edges (13, 14) of which are embedded together, and spaced apart by spacers (15) in the mid-parts, the said membranes each being formed by a film (11, 12) made of piezoelectric polymer material, metallised on its two faces (111, 112, 121, 122), the two metallised films (11, 12) being excited in phase opposition by the same modulated electrical source. Preferential application to the production of linear loudspeakers, with one or more frequency-specialised elements. IMAGE