SPEAKER DIAPHRAGM AND METHOD OF MAKING THE SAME

摘要

SPEAKER DIAPHRAGM AND METHOD OF MAKING THE SAME The present invention relates to a speaker diaphragm constructed by forming a boron layer on one face of a domeshaped metal foil. The layer is formed by means of a physical vapor deposition method such as ion-plating, cathode sputtering, vacuum evaporation or the like. When necessary, the metal foil is thinned by etching, and then, if necessary, another boron layer is formed on the other face of the metal foil. Alternatively, a metal layer is formed on the surface of the boron layer. The resulting speaker diaphragm is light in weight and high in specific modulus of elasticity and also has appropriate internal mechanical resistance against vibration. As a result the speaker according to the present invention is of a high efficiency and has satisfactory characteristics.