Speaker diaphragm and its manufacture

Abstract

Abstract PURPOSE:To obtain a diaphragm having an acoustic characteristics changed into a desired state, by clipping a mixed layer where the rate of composition of each material is changed continuously between different material layers so as to attain integration. CONSTITUTION:A base plate 4 made of copper to be etched easily is arranged in a bell jar 1. Boron is put in an evaporator 2 and titanium is put in an evaporator 3. Air is evacuated from a lower part 5 of the bell jar 1, the 1st material layer is vapor-deposited on the base plate 4 by heating the boron to form a prescribed thickness. Then, the evaporation of boron is decreased gradually, the evaporation of titanium is started and increased gradually, and only titanium is evaporated finally, and when the layer reaches a prescribed thickness, the vapor-deposition with the inverse process as above is performed and when the layer only with boron reaches a prescribed thickness, the vapor-deposition is stopped. The base plate is removed by etching to form a diaphragm 6 with multi-layer structure. Thus, the diaphragm excellent in the acoustic characteristics and having a desired characteristics is attained.

Inventors

• 👤 Sadao Taguchi
• 👤 田口　貞夫
• 👤 Toshio Watanabe
• 👤 渡辺　東史雄
• 👤 Susumu Takahashi
• 👤 暹 高橋

Bibliographic Details