JPS647800A - Sound generating diaphragm - Google Patents

Abstract

PURPOSE:To uniform the extension of a diaphragm in all directions by laminating a first cloth and second cloth being more than the former in the number of pieces, weaving a part of the first cloth with a fiber whose extension at breaking points is low, weaving the second cloth with a fiber whose extension at breaking point is high, and further acrossing the warps of the second cloth at a prescribed angle. CONSTITUTION:The diaphragm 10 for sound generation is constituted, for example, of three layers such as an upper layer 12, an intermediate layer 14, and a lower layer 16. In this constitution, denoting the number of pieces of the intermediate layer 14 by 1 which is of the first cloth and denoting the number of pieces of the other two layers 12, 16 by which are of the second cloth, a relation x>1 is provided. At least a part of the intermediate layer 14 is woven with the fiber of low extension at breaking point, but the layers 12, 16 are woven with the fiber of high extension at breaking point, further, the warps of the layers 12, 16 are made crossing with those of the intermediate layer 14 at an angle 10-80 degrees. For the intermediate layer 14, aramide fiber, glass fiber, or carbon fiber is used, and for the upper and lower layers, polyester resin, polychrolo vinylidence resin, or nylon resin is used.