Patent ID: 8565454
Filing Date: 2013-10-22
Classification: H04R

Abstract:
1. A plate-like electrostatic actuator that is arranged close to a ceiling and has: a signal input site that is on an edge of the actuator, at least one plate-like stator that has a stator surface and an electrode that is formed on the stator surface and receives a sound signal from a signal line, at least one moving diaphragm, that creates a sound field, and an RC circuit that has a resistor that directs the sound field, wherein: the resistor is at least partly formed by making the stator surface that forms the electrode from a material that is resistive enough to delay the sound signal from a location away from the signal input site sufficiently more than from a location closer to the signal input site so that the resulting sound field is a plane waveform sound field that is turned away from the ceiling.