the present invention provides an electroacoustic transducer which can increase the winding efficiency of a coil on a pole and allows the automation of a coil winding process . the present invention relates to an electroacoustic transducer for vibrating a diaphragm by a magnetic field generated in response to an inputted electric signal to convert the electric signal into sound . the coil is wound around the pole along its entire length . however , at the pole tip , the coil is formed to have an outwardly diverging , frusto - conical recess that exposes the pole tip .