Patent ID: 8094867

Claim:
A speaker comprising: a frame having a first side and a second side; a diaphragm disposed at the first side of the frame; a cover disposed at the first side of the frame and covering the diaphragm, a magnetic device disposed at the second side of the frame, the magnetic device comprising a yoke, a magnet, and a pole piece, the yoke having a protrusion by bending for the magnet and the pole piece to be mounted upon; and a voice coil disposed on a magnetic loop generated by the magnetic device and integrated with the diaphragm; wherein the yoke further comprises two platforms, the protrusion being disposed between the two platforms, the yoke having a gap defined at each of the two opposite sides thereof so that the length of the protrusion is less than the length of the yoke and the magnet is in touch with the two platforms when mounted onto the yoke.