| 摘要 |
PURPOSE:To obtain a high rigid and high internal-loss speaker having high temperature resistant characteristics, by forming the speaker constitution body by using a kneaded material which consists essentially of polymethylmethacrylate and flake graphite powder. CONSTITUTION:With polymethylmethacrylate, a rubbery material, such as acrylonitrile butadiene rubber, isobutylene-isoprene rubber and styrenebutadiene rubber, is mixed as required to obtain resin material 1. Then, flake graphite powder 2 is mixed with said resin material 1 to obtain kneaded material 3, which is molded into a speaker constitution body. |
