PURPOSE: To obtain a speaker having high linearity to a speaker input in respect to a speaker diaphragm to be used for various acoustic apparatuses, reducing the drop rate of minimum resonance frequency at the time of high resistance input, improving material yield, and having high reliability. CONSTITUTION: Nonwoven fabric 18 having less directivity, a tape-like resin foaming sheet 17 of a porous material, or a material obtained by impregnating or coating the above sheet with rubber-like resin 19 is abutted like a ring. Since a free edge 11 obtained by heating and pressing is used, a speaker improving material yield and having high reliability can be obtained. COPYRIGHT: (C)1992,JPO&Japio




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