Sound device

A sound device, comprising:

• a frame;
• a first vibration system;
• an asymmetric magnetic circuit system;
• a second vibration system;
• and
• a front cover;
• wherein the frame comprises a first frame and a second frame, the second frame is stacked on and fixed to the first frame;
• the first vibration system comprises a first vibrating diaphragm and a first voice coil, the first vibrating diaphragm is fixed to the first frame, and the first voice coil is configured to drive the first vibrating diaphragm to vibrate and sound;
• the asymmetric magnetic circuit system is fixed to the frame, the asymmetric magnetic circuit system comprises a first magnetic conductive plate, a main magnetic steel, first side magnetic steels, second side magnetic steels, and second magnetic conductive plates;
• the second magnetic conductive plates are independent of the first magnetic conductive plate to adjust a magnetic gap between them;
• the first magnetic conductive plate is fixed to the first frame, the first magnetic conductive plate comprises a magnetic conductive plate body, side plates, and fixing plates;
• the side plates are bent and respectively extend towards the first vibration system from two opposite sides of the magnetic conductive plate body, the fixing plates are bent and respectively extend from the side plates to the first frame, the fixing plates are directly fixed to the first frame;
• the main magnetic steel is fixed to one side, close to the first vibration system, of the magnetic conductive plate body;
• the first side magnetic steels are fixed to the frame and are located between the first frame and the second frame and are spaced apart;
• the first side magnetic steels are respectively disposed on a first side and a second side of the main magnetic steel, the two side plates are spaced apart, the two side plates are respectively disposed on a third side and a fourth side of the main magnetic steel;
• the main magnetic steel, the first side magnetic steels, and the side plates enclose to define a first magnetic gap;
• the second side magnetic steels are fixed to one side, away from the first vibration system, of the fixing plates;
• each of the second side magnetic steels is disposed on one side, away from the main magnetic steel, of a corresponding side plate;
• the second side magnetic steels are spaced apart;
• each of the second magnetic conductive plates is stacked on one side, away from the first vibration system, of each of the first side magnetic steels and/or each of the second side magnetic steels;
• the second magnetic conductive plates are directly fixed to the second frame, the second magnetic conductive plates are disposed around the magnetic conductive plate body of the first magnetic conductive plate at intervals to form a second magnetic gap between them;
• and the first voice coil is inserted into the first magnetic gap;
• and
• the second vibration system comprises a second vibrating diaphragm and a second voice coil, the second vibrating diaphragm is fixed to the second frame and located on one side, away from the first vibration system, of the asymmetric magnetic circuit system;
• the second voice coil drives the second vibrating diaphragm to vibrate and sound, and the second voice coil is inserted into the second magnetic gap;
• the front cover covers on one side, away from the second vibration system, of the second frame for forming a housing.