| 摘要 |
PURPOSE:To prevent a blister even if a skin material deforms owing to heat, by interposing an air-permeable member between the core material and skin material of a diaphragm for a speaker. CONSTITUTION:To both sides of plane core material 1, a sheet of air-permeable member 10, such as woven cloth, unwoven cloth and continuously foamed urethane, is stuck by adhesives and outside of members 10, skin material 2 are also stucked by adhesives to constitute a diaphragm. Consequently, even if air in small air cell 3 of core material 1 expands, the air is exhausted to the circumferential part of the diaphragm via member 10, so air-permeable member 10 decreases remarkably in the force of pushing skin material 2 up to the outside, so that skin material 2 will never deform by having a blister. |
