| 摘要 |
PURPOSE:To obtain a small, thin freely workable speaker box without necessitating acoustic material by making a speaker box sandwich structure. CONSTITUTION:Skin material 1, 3 is bonded to a core material 4 formed of a substance of low density combined in three-dimensional direction in which air can flow in and out in three-dimensional direction. A hole 2 for fitting a speaker is made in the skin material 1, and a hole for fitting a speaker is also made in the core material 4. The core material is foaming resin such as styrene resin, vinyl chloride resin, polyurethane etc. in which a foaming agent such as carbon dioxide, propane, ethyl ether, petroleum ether etc. is absorbed. Metal, wood, resin etc. are used as skin material. By this way, a small, light, thin easily workable speaker box can be obtained without necessitating acoustic material. |
