ELECTROACOUSTIC TRANSDUCER

PROBLEM TO BE SOLVED: To provide an electroacoustic transducer capable of improving drive efficiency in a magnetic circuit and capable of accurately positioning a base at a prescribed position to a casing. SOLUTION: The electroacoustic transducer has a magnetic circuit unit. The magnetic circuit unit has: the casing 11; a base 12 composed of a square plate fixed into the casing 11; a magnet 16 fixed onto the inner surface of the base 12; and a yoke fixed onto the upper surface of the magnet 16. A diaphragm is supported in the casing 11, and a voice coil 20 is fixed onto the diaphragm so that the voice coil 20 is positioned in the magnetic gap of the magnetic circuit unit. Bend sections 15 along the inner surface of the casing 11 are formed on four sides of the base 12, a protrusion 31 is formed at the corner section between the bend sections 15, and a positioning surface is formed on one side of the protrusion 31. COPYRIGHT: (C)2008,JPO&INPIT