Double-layered electret electroacoustic conversion device, and electronic device with electret loudspeaker

The invention discloses a double-layered electret electroacoustic conversion device, and an electronic device with an electret loudspeaker. The electroacoustic conversion device comprises a first electrode which is formed on a first insulating panel with a plurality of holes. A double-layered electret diaphragm is arranged in an opposite position to the first electrode, wherein an aluminum coat layer is held between two layers of the double-layered electret diaphragm to form a lamination structure. A first isolation structure is arranged between the first electrode and the double-layered electret diaphragm. A second electrode is formed on a second insulating panel with a plurality of holes and is arranged in an opposite position to the double-layered electret diaphragm. A second isolation structure is arranged between the double-layered electret diaphragm and the second electrode. When the electroacoustic conversion device is running, an AC bias applied between the first electrode and the second electrode provides an electric field to drive the electret diaphragm for oscillation.