ELECTRIC-ACOUSTIC TRANSDUCER HAVING MOVING MAGNET AND TRANSDUCING METHOD THEREOF

摘要

Disclosed is an electric-acoustic transducer comprising at least one fixed coil (124) adapted to generate alternating magnetic field upon externally receiving an electrical drive signal, a frame (102) having a recessed structure for centrally receiving and supporting the fixed coil, at least one moving permanent magnet (117) disposed over the fixed coil while being spaced from the fixed coil (124) by a desired vertical distance in such a fashion that it is vertically movable, the moving permanent magnet (117) serving to generate non-alternating magnetic field, and a vibrating diaphragm (103) supported by an upper end of the frame at a peripheral portion thereof, the vibrating diaphragm supporting the permanent magnet (117) by a central portion thereof, whereby the vibrating diaphragm (103) vibrates vertically in accordance with an interaction between the alternating magnetic field generated from the fixed coil (124) and the non-alternating magnetic field generated from the permanent magnet (117).