| abstract |
(57) [Summary] [Problem] To provide a speaker diaphragm having improved resistance to environment, lower density and an appropriate internal loss value, and having strength capable of withstanding high-power mechanical vibration. provide. SOLUTION: A speaker diaphragm 1 includes a diaphragm base mainly composed of an inorganic fiber 2 made of glass fiber, ceramic fiber or the like, and an inorganic filler entirely filled so as to fill a space in the diaphragm base. It is made of a foamed material 3. Further, it contains a heat-resistant chemical fiber 4 and a wood pulp organic fiber 5 as necessary. |