Patent ID: 6175636
Filing Date: 2001-01-16
Classification: H04R

Abstract:
An electrostatic speaker device, comprising:a first stator which has a substantially acoustically transparent portion;a second stator spaced from the first stator at a distance which defines a charge capacitive region between the first and second stators which operates as an electrostatic field capable of driving a charge sensitive diaphragm as a speaker element, the first and second stators being configured for push-pull operation to provide enhanced linearity within low frequency ranges;at least one charge sensitive diaphragm spaced from and sandwiched between the first and second stators and having a conductive layer for being responsive to the electrostatic field;support structure coupled to at least one of the first and second stators, said support structure being attached at a portion of a perimeter of the diaphragm in a manner that imposes tension across the diaphragm and orients the diaphragm substantially parallel to the acoustically transparent portion of the first and second stators, to enable the first and second stators to drive the diaphragm as the speaker element;at least a portion of the diaphragm being spaced from the first and second stators sufficient to avoid contact between the diaphragm and stators during operation at the low frequency ranges and including a diagonal which is unstressed at at least one edge to allow movement at the at least one edge of the diaphragm in response to the electrostatic field for enhancement of low frequency vibration within an audio frequency range, andelectrical contacts coupled to the respective first and second stators for coupling an audio signal source.