真空蒸着法を用いたBe-Al複合振動板の製作

概要

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A Be-Al composite diaphragm for a loudspeaker with high performance is developed by a simple and dry process using a vacuum deposition method. The diaphragm with a double layered structure consists of an aluminum foil (JIS-5052) substrate and a beryllium thin film deposited on the concave side of the substrate. The Young's modulus of a Be film deposited at a substrate temperature of 500℃ reaches 2. 2-2. 4×10^<11>N/m^2 comparable to that of a rolled Be sheet. Be deposit thikness is determined through the calculated relationship by finite element method between high frequency resonace ƒ_H of a loudspeaker and thicknesses. the ƒ_H of 26mm diameter dome-type loudspeaker with a Be (30μm thick)-Al (15μm) composite and a Be (30μm) deposit diaphragm (without substrate) are 42kHz and 44kHz, respectively. In the same way for a 66mm diameter diaphragm, the ƒ_H with a Be (70μm)-Al (22μm) composite and a Be (70μm) deposit diaphragm are 14kHz and 16kHz. There is little difference in characteristics of frequency response and of harmonic distortion between the Be-Al composite and the Be deposit diaphragm loudspeaker. And Be-Al composite diaphragm has some merits such as large mechanical strength because of Al-substrate and low manufacturing cost.
社団法人日本音響学会の論文
1981-07-01