Sound device

A sound device comprising:

• a frame having a receiving space;
• a magnet system received in the receiving space, comprising:
• a first inner yoke;
• a main magnet fixed to the first inner yoke;
• a side magnet fixed to the frame and spaced apart from the first inner yoke forming a second magnetic gap;
• a first side yoke fixed to the side magnet and spaced apart from the main magnet forming a first magnetic gap;
• and
• a connection portion connecting the first inner yoke with the first side yoke;
• a first vibration system arranged on one side of the magnet system, comprising:
• a first diaphragm fixed to the frame;
• a rectangular first coil inserted into the first magnetic gap and surrounding the main magnet;
• and
• a first FPC electrically connected with the first coil;
• a second vibration system arranged on the other side of the magnet system, comprising:
• a second diaphragm fixed to the frame;
• and
• a second coil inserted into the second magnetic gap and malposed with the first coil;
• wherein
• the first FPC comprises a first fixation portion fixed to the frame, a first welding portion welded to the first coil, and a first elastic portion connecting the first fixation portion with the first welding portion;
• the first elastic portion is spaced apart from the first side yoke along a vibration direction;
• the first welding portion is fixed to a side of the first side yoke facing the first diaphragm.