▎ 摘　　要

NOVELTY - The device has a graphene diaphragm arranged parallel to a back electrode. The graphene diaphragm and the back electrode are used to generate a prepolarized electric field. The back electrode facing side of the graphene diaphragm is covering the electrets layer of the prepolarized. The graphene diaphragm of the prepolarized not limited to redox processes and ultrasonically stripping an ion adsorption method. The electrets layer is in thickness of about 10 to 40 microns. The electrets layer is made of polypropylene. A microphone is provided with housing. USE - Capacitive sound collecting device for microphone. ADVANTAGE - The device has improved sound collection sensitivity, stronger tensile strength, increased tolerate sound pressure characteristic and wide frequency width. DESCRIPTION OF DRAWING(S) - The drawing shows a partial sectional view of a capacitive sound collecting device for microphone.