Patent ID: 6305491
Filing Date: 2001-10-23
Classification: H04R

Abstract:
A speaker, comprising:a diaphragm;a frame accommodating the diaphragm; andan edge attached to an outer periphery of the diaphragm as well as to an inner periphery of the frame so as to retain the diaphragm within an interior of the frame,wherein the edge has a thickness which is smallest at substantially a central portion between the diaphragm and the frame and the vicinity thereof, and increases toward the diaphragm and the frame,wherein the edge is formed of a foam material so as to have a structure in which the surface layers are dense, while the interior is porous,wherein the edge retains the diaphragm in such a way that the diaphragm can vibrate freely, and one end portion of the edge is attached to the diaphragm so as to vibrate with the diaphragm.