Patent ID: 6483924
Filing Date: 2002-11-19
Classification: H04R

Abstract:
An acoustic element having a plate-like structure, comprisingfirst and second porous stator plates which are either electrically conductive or plated on at least one side to be electrically conductive, and at least one moving diaphragm with at least one electrically conductive surface, and said diaphragm being arranged for movement in relation to said stator plate, wherein said first and second stator plates are arranged symmetrically to opposite sides of said diaphragm and said diaphragm being arranged for movement toward and away from each of said first and second stator plates; and wherein each of said stator plates includes a facing surface facing said diaphragm with the facing surface of each stator plate being formed such that air gaps are formed between the diaphragm and the stator plates and wherein said diaphragm is arranged to move symmetrically relative to said first and second stator plates.