Abstract: There is provided a method of manufacturing a loudspeaker damper having the steps of attaching a conductive material to a damper raw material at the top or bottom surface thereof, the damper raw material being made of a woven or unwoven cloth impregnated with thermosetting resin such as phenol resin and being made in a semi-dry state, and thermally molding the damper raw material with the conductive material to form concentric corrugation along which conductive material used as a conductive wire for a voice signal is formed, wherein the method further including the steps of: after attaching the conductive material to the damper raw material, coating creamy solder to the conductive material at a predetermined area, melting the creamy solder by the heat at the thermal molding step, detaching the damper raw material from a metal mold to cool and harden the creamy sodler, and forming preparatory solder at the end portion of the conductive material.

Abstract: Conductive members are sewed and mounted to a damper main body. The conductive members are made of a woven wire which is formed by winding double conductive foils. The shape of the corrugations of the damper increases as the position approaches from the inner periphery to the outer periphery.

Abstract: An acoustic vibrator member includes a substrate sheet made of propylene resin with solid microparticles dispersed therein and a film made of propylene resin laminated on the substrate sheet. The film carries a printed visible pattern. The vibrator member is freely colorable while retaining suitable physical properties.

Abstract: A flame retardant diaphragm for speakers, etc. comprises an admixture of natural fibers and inorganic fibers. The admixture is impregnated with a thermosetting resin and an organic bromine compound, and heat-treated under pressure. The organic bromine compound acts as a flame retarder.

Abstract: A flame-retarded speaker diaphragm is prepared by making a cone from cellulose fibers, impregnating the cellulosic cone with a solution of a trimethylol melamine monomer, an organic phosphorus- and nitrogen-containing compound, and a trialkyl amine catalyst in an alcohol solvent, and heating the impregnated cone until the solvent is removed and the melamine resin is cured. Flame retardancy is imparted to the cellulose cone-shaped diaphragm without the sacrifice of its frequency response.