| 摘要 |
PURPOSE:To make the sound pressure characteristic flat throughout all frequency bands without the sacrifice of efficiency of a diaphragm, by adding a foamed material containing liquid to an arbitrary position of the light-weight diaphragm. CONSTITUTION:Surface materials 2 and 3 are stuck to the surface and the reverse face of core material 1 of honeycomb structure having many cells, thus constituting diaphragm 4. Foamed material 5 such as butyl rubber impregnating liquid such as oil internally is added to the part surrounded by the outside circumference of core material 1 and surface material 2. Thus, loss of the whole of the diaphragm can be increased to restrain the resonance peak on the sound pressure characteristic. |
