Humidity-proof, quasi-isotropic wood diaphragm for loudspeakers

概要

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A flat wood diaphragm 105*105mm in size for a low to middle range loudspeaker was developed using the wood for soundboards of musical instruments. It is necessary for the wood diaphragm to be humidity-proof and isotropic. For the former, coating with varnish, which was the same as that used for the soundboards, and acetylation, which was essential in the conversion of hydrophile property, were carried out. The humidity-proof performance of these treatment was tested, and each treatments showed the charactristic effect. For the latter, rectangular wood bars for reinforcing radial(R) direction, which was lower in strength, were glued to both edges of the square wood board, one side of which was parallel to longitudinal(L) direction, in L direction. It was found that the wood board with bars, wood diaphragm, had a circle node at quasi-isotropy, and it was clarifies that the circle node was produced by the degeneration of both vibrations in each direction of L and R. Loudspeakers with the developed wood diaphragm showed acceptable performance.
社団法人日本音響学会の論文