Multi-cone speaker

A multi-cone loudspeaker comprising:

• a frame;
• a cone assembly arranged on the frame, comprising a central cone and a plurality of outer cones, the plurality of outer cones being successively arranged in a circumferential direction of the central cone, and the plurality of outer cones being not connected to each other;
• a central driving mechanism;
• and
• a plurality of outer driving mechanisms arranged around a periphery of the central driving mechanism,
• wherein the central cone is driven by the central driving mechanism to vibrate and sound, each of the plurality of outer cones is driven by one of the plurality of outer driving mechanisms to vibrate and sound, the central driving mechanism comprises a central voice coil connected to the central cone and a central magnetic driving system for driving the central voice coil, and each of the plurality of outer driving mechanisms comprises an outer voice coil connected to one of the plurality of outer cones, an outer damper sleeved on the outer voice coil, and an outer magnetic driving system for driving the outer voice coil,
• wherein the frame comprises:
• an annular outer part;
• an annular inner flange located inside the annular outer part, the annular inner flange being ring-shaped, the central magnetic driving system fixedly arranged on the annular inner flange;
• a plurality of middle flanges connected between the annular outer part and the annular inner flange;
• and
• a plurality of outer positioning flanges fixedly connected to the annular outer part and the annular inner flange through connecting ribs, the plurality of outer driving mechanisms fixedly arranged on the plurality of outer positioning flanges,
• wherein each of the central magnetic driving system and the outer magnetic driving systems comprises:
• a U-yoke having a cavity;
• and
• a magnetic steel and a magnetic pole core arranged within the U-yoke, and
• wherein an upper end of the U-yoke is fixedly connected to the annular inner flange or one of the plurality of outer positioning flanges, and a magnetic gap into which the central voice coil or one of the outer voice coils is inserted is formed between the magnetic steel and the magnetic pole core and an inner wall of the U-yoke.