Patent ID: 8867778

Claim:
A loudspeaker comprising: a basin-shaped frame with a hollow bottom having a first end and a second end; a diaphragm having a middle part; a yoke with a U-shaped cross-section having an inner side; a magnet disposed on and joined to the inner side of the yoke; a forward plate with magnetic permissibility being disposed on and joined to the magnet, wherein a magnetic clearance is formed between the outer side of the forward plate and the upper inner side of the yoke; a support post having a first support end and a second support end with the first support end being disposed away from the forward plate and joined to the middle part of the diaphragm and the second support end being joined to the forward plate; a voice coil having an upper end attached to the diaphragm, accommodating the forward plate and the support post, and ‘providing a conductive coil; wherein the first and second ends of the frame are joined to the diaphragm and the yoke respectively; an inner space is enclosed by the frame, the diaphragm and the yoke to receive the magnet, the forward plate, the voice coil and the support post; an end of the conductive coil is disposed in the magnetic clearance to allow the voice coil without deviating from moving axially and without touching the yoke or the forward plate to avoid noise; wherein the second support end of the support post has a second post part; a second groove is disposed at the center of the forward plate; the second post part of the support post is engaged to the second groove; wherein the loudspeaker further comprises a fixing post which has an enlarged lower end and a first post part extending from the enlarged lower end; the first support end of the support post has a first groove; the middle part of the diaphragm has a through hole; the first post part of the fixing part passes through the through hole and engages with the first groove of the support post; the middle part of the diaphragm is held between the enlarged lower end of the fixing post and the first support end of the support post; and wherein the loudspeaker further comprises a dust cover, and a third groove disposed in the dust cover; the third groove fits with the fixing post.