VERFAHREN ZUR HERSTELLUNG EINES DIAPHRAGMAS FUER EINEN LAUTSPRECHER AUS VOLL KOHLENSTOFFHALTIGEN MATERIALIEN

摘要

A process for producing a diaphragm for a speaker of fully carbonaceous materials which has the steps of mixing carbon powder in an organic binder carbonized after calcining, kneading the mixture until the composition is uniformly mixed and dispersed, preliminarily molding it in a sheet shape, molding the preliminarily molded material in a diaphragm shape, insolubilizing, infusibilizing the mixture and calcining the mixture in an inert atmosphere, wherein the mixture composition contains a titanate coupling agent. Thus, a rigid bonding strength is provided in the boundary between the organic binder and the carbon powder in the green state of the mixture composition, and the mixture is calcined to simply and inexpensively produce the diaphragm having high hardness, high elasticity, high strength, light weight, an adequate internal loss, and thus less deformation by an external force, small distortion of sound, wide reproducing sound range, distinct sound quality and is adapted for digital audio.