PURPOSE: To obtain a speaker diaphragm with light weight and high rigidity by piling up light metal layers on both surfaces of a substrate formed in a dome by a foaming hard resin.
CONSTITUTION: Thin Al foils 3a and 3b are piled up on both surfaces of a substrate 1 formed in a dome by a foaming hard resin, for instance, 25-fold foaming acrylic resin, thereby showing a three-layer laminated structure. In order to manufacture this speaker diaphragm, a flat disk-like substrate 1 is placed between a female-type 12 recessed in a dome and projected male-type 13, both of which constructs a die 11 and have heaters 14, and formed in a dome by a hot press. The Al foils 3a and 3b made to a dome beforehand by vacuum molding are disposed at both sides of the substrate, and a sheet-like heat melting resin adhesive 15 is held, heated, pressed by pressure and formed by a die 11. Thus the Young's modulus is improved because of the laminated state, and a high rigidity can be obained with light weight.
| JPS57192196 | DIAPHRAGM FOR SPEAKER |
| JPS56143795 | DIAPHRAGM FOR ELECTROACOUSTIC TRANSDUCER |
| JP2002508041 | [Title of Invention] Molded Aramid Sheet |
WATANABE TOSHIO
TAGUCHI SADAO
