Patent ID: 8462977

Claim:
A loudspeaker with magnetic elements fixedly provided on a diaphragm, the loudspeaker comprising: a frame integrally formed by stamping or molding a metal plate, wherein the frame has a top side formed with an opening and a bottom side centrally provided with a through hole, and the frame defines therein a receiving space; a coil tube formed as a hollow tube, wherein a coil unit is fixedly mounted around an outer periphery of the coil tube, and the coil tube has a first end whose outer periphery is fixed to a periphery of the through hole such that a second end of the coil tube is received in the receiving space of the frame; a diaphragm attached to a periphery of the opening of the frame and extending toward the receiving space; a first magnetic element having a first end connected to a central position of the diaphragm, wherein the first magnetic element is received in the coil tube and corresponds in position to a first end of the coil unit; a connecting seat received in the coil tube and having a first end connected to a second end of the first magnetic element; a second magnetic element having a first end connected to a second end of the connecting seat, wherein the second magnetic element is received in the coil tube, corresponds in position to a second end of the coil unit, and has a magnetic orientation opposite to that of the first magnetic element; a third magnetic element made of a magnetically permeable material, formed as a cylinder, and having an inner diameter larger than an outer diameter of the coil tube, wherein the third magnetic element has a first end fixedly connected to the central position of the diaphragm, a second end formed with a second opening, and a second receiving space therein and corresponding in position to the second opening, such that the first end of the first magnetic element is positioned and received in the second receiving space via the second opening, and the second end of the third magnetic element is adjacent to and covers the first end of the coil tube; and a first damping membrane having concentric corrugations and a central hole, wherein the central hole of the first damping membrane has a periphery fixedly connected to the diaphragm at a position adjacent to the first magnetic element, and an outer periphery of the first damping membrane is horizontally connected to a corresponding position of the frame.