ELECTROACOUSTIC TRANSDUCER

PROBLEM TO BE SOLVED: To improve the acoustic characteristic by preventing a face rigidity of a diaphragm from being deteriorated and extending a flat frequency characteristic region. SOLUTION: A magnetic circuit is configured by a yoke 1, a permanent magnet and a plate, a dome type diaphragm 5 is outerfitted slidably to a center pole 1a of the yoke 1 and an equalizer mount shaft 6b of an equalizer 6 is inserted to an open hole 5d in the center of the diaphragm 5 and fixed to the center pole 1a and a cylindrical part 5a of the diaphragm 5 is skided freely to a gap of the magnetic circuit. A coil 10 is wound thereon to form integrally a cylindrical reinforcement section 5e at the inner ridge of the open hole 5d of the diaphragm 5 or a torus corrugation is formed integrally to the surrounding part of the open hole 5d to prevent deterioration in the face rigidity of the surrounding part of the open hole 5d.