ELECTROACOUSTIC TRANSDUCER

PROBLEM TO BE SOLVED: To secure a required sound pressure and to widen a reproduction band compatibly even when miniaturizing a dynamo-electric electroacoustic transducer. SOLUTION: A diaphragm 12 is composed of a center vibrator 12A and an annular vibrator 12B less rigid than the center vibrator 12A, and the acoustic characteristics of the electroacoustic transducer 10 are improved. At the time, a projection 12Ad projected to the position on the outer peripheral side from the joined part 12b of the center vibrator 12A and the annular vibrator 12B is extended and formed at the outer peripheral edge 12Aa of the center vibrator 12A, and a voice coil 14 and the diaphragm 12 are fixed at the projection 12Ad. Thus, the size of a magnet 34 is increased, the magnetic flux density of a magnetic gap is increased, and the sound pressure of the electroacoustic transducer 10 is increased. Also, since the position of the joined part 12b is not restrained by the fixing position of the voice coil 14 and the diaphragm 12, the annular vibrator 12B is widened and the rigidity is lowered. COPYRIGHT: (C)2007,JPO&INPIT