TRANSDUCENT VAN DE ALS ELECTREET AANGEDUIDE SOORT MET EEN NAAR KEUZE GEMETALLISEERDE ACHTERPLAAT.

摘要

An acoustic transducer for producing highly directional characteristics comprises a metalized backplate (130) facing the flat surface (134) of an electrostatically charged electret foil (132). The thickness of the electret foil varies along the length thereof according to a predetermined relationship. The sensitivity of the electret transducer varies directly with the thickness of the electret foil.