| 摘要 |
PURPOSE:To obtain a speaker which has a flat sound pressure-frequency characteristic by applying a heat expansion treatment on the surface of a diaphragm material containing fiber to obtain an independent porous layer and a binder film covering said porous layer. CONSTITUTION:A speaker cone is manufactured to sheets by crushing with adjustment the KBKP pulp. The heat expansion component uses 10-30pts.wt. hydrocarbon of a low boiling point containing a vinylidene chloride coplymer as a shell wall, and a binder uses 100-200pts.wt. self-crosslinkage type water solble resin. These heat expansion component and binder are dissolved into 400- 600pts.wt. water, i.e., solvent by means of a disaggregating machine. Furthermore 10-30pts.wt. saturated zinc chloride solution is added to said solvent to improve the smoothness properties. such a solvent is sprayed to the diaphragm material of a speaker by a spray gun, etc. This diaphragm material is heated at 120- 140 deg.C for three minutes after a preliminary drying process carried out at 60- 80 deg.C within a hot air drying machine together with the addition of pressure when necessary. Thus an independent porous layer 2 and a binder film covering the layer 2 are formed on the surface of a speaker diaphragm. |
