Magnetic assembly and electro-acoustic transducer using same

An electro-acoustic transducer, comprising,

• a frame having a receiving space;
• a magnetic assembly received in the receiving space and including:
• a lower plate;
• a main magnet positioned on a central portion of the lower plate;
• an auxiliary magnet positioned on a periphery portion of the lower plate, surrounding the main magnet with space for forming a magnetic gap, and having an inner surface facing the main magnet and an outer surface opposite to the inner surface;
• a first pole plate including a base body attached on the auxiliary magnet, and a magnetic conduction member connected with the base body and overlapping the outer surface of the auxiliary magnet for forming a loop of magnetic flux together with the base body and the lower plate as well as the auxiliary magnet;
• and
• a second pole plate attached on the main magnet;
• and
• a diaphragm assembled with the frame and vibrating along a vibration direction;
• a voice coil connected with the diaphragm and partially received in the magnetic gap.