Patent ID: 6069965
Filing Date: 2000-05-30
Classification: H04R

Abstract:
A loudspeaker, comprising:a frame;a magnetic circuit portion;a diaphragm transmitting air vibration;a cylindrical voice coil bobbin connected to the diaphragm;a voice coil fixed to an outer peripheral portion of the voice coil bobbin; anda damper holding the voice coil bobbin in such a manner that the voice coil is capable of vibrating in a magnetic gap formed between an annular top plate and a center pole included in the magnetic circuit portion,wherein the damper includes a flat portion which has a hole for passing the voice coil bobbin therethrough at its center, the flat portion having a structure which retains its flatness with respect to vibration of the voice coil, and a plurality of roll structures connected to a periphery of the flat portion and having a cross-section including a bent periphery, with all of the plurality of roll structures included in the damper having a convex shape toward the same direction, andeach of the plurality of roll structures is fixed to the frame, and the hole of the flat portion is fixed to an outer peripheral surface of the voice coil bobbin.