| 摘要 |
PURPOSE:To make the sound pressure characteristic flat throughout a wide band by adding large-loss materials around the light-weight diaphragm where surface materials are stuck to the surface and the reverse face of the core material. CONSTITUTION:End parts of surface materials 2 and 3 of diaphragm 4 where surface materials 2 and 3 are stuck to the surface and the reverse face of core material 1 of honeycomb structure having many cells are extended, and large-loss materials such as butyl rubber, semihardening viscose rubber and semihardening adhesion sheet are interposed and stopped between the end parts above by the method such as adhesion. Thus, since the sound velocity is high in diaphragm 4 itself and loss around the diaphragm is increased, loss of the diaphragm is increased, so that a flat sound pressure characteristic can be obtained up to a high band. |
