Patent ID: 6735323
Filing Date: 2004-05-11
Classification: H04R,Y10T

Abstract:
A speaker comprising:a T-shape iron having a central protrusion on a central portion thereof; a ring magnet mounted around the central portion of the T-shape iron; a pole plate mounted on top of the ring magnet and spaced from the T-shape iron; a frame mounted above the pole plate; a diaphragm mounted to the frame; a coil core portion mounted around the central protrusion of the T-shape iron; a voice coil wound around the coil core portion; a first annular corrugated plate mounted around the coil core portion and spaced from the voice coil, the first annular corrugated plate having an inner section adjacent to the coil core portion and an outer section distal to the coil core portion; and at least one second annular corrugated plate bonded to one of an inner side and an outer side of the outer section of the first annular corrugated plate and spaced from the coil core portion, thereby increasing a thickness and strength of the outer section of the first annular corrugated plate for bearing higher power such that the speaker generates clear sound and that the inner section of the first annular corrugated plate generates sufficient sound pressure when a power outputted by the speaker is low, said at least one second annular corrugated plate having an inner diameter greater than that of the first annular corrugated plate.