▎ 摘　　要

NOVELTY - A vibrating film of sound production device comprises at least one modified ethylene-propylene rubber film layer. The modified ethylene-propylene rubber film layer is prepared by mixing inorganic hollow microbead, additive and polymer compounded by ethylene and propylene as basic monomer to form mixed rubber and cross-linking. The inorganic hollow microbead has grain diameter of 1-60 µm and distribution density of 0.15-0.9 g/cm3in the film layer. The modified ethylene-propylene rubber film layer is placed in environment of 130℃ for 70 hours, and compression permanent deformation under the condition of 25% compression ratio is less than or equal to 55%. USE - Vibrating film of sound production device e.g. loudspeaker. ADVANTAGE - The film comprises modified ethylene propylene rubber film layer prepared by mixing inorganic hollow microbead, additive and polymer compounded by ethylene and propylene as basic monomer to form mixed rubber, so that the density of the film material can be reduced, the medium frequency sensitivity of a sound production device is improved, and the film material has excellent rebound performance under high temperature condition. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for sounding device.