Magnesium speaker diaphragm, method of manufacturing the same, and speaker with such a diaphragm

摘要

A high-quality magnesium sheet which is less susceptible to influence of oxidation, which realizes a high internal loss, prevention of a drop in sensitivity, and low distortion, and which has a thickness of 30 µm to 100 µm is prepared according to rolling process, wherein the level of rolling performed by a rolling mill during each rolling operation is set to 1 µm to 20 µm. A magnesium substrate is rolled by rollers while being heated by a thermostatic chamber. Further, as a result of the magnesium sheet being formed into a semi-dome shape or a dome shape, the sheet can be inexpensively manufactured as a speaker for high-tone playback. In particular, in the case of a magnesium diaphragm into which a dome section and an edge section are integrally formed, high-quality sound can be played back in a high frequency range without involvement of a drop in sensitivity.