| 摘要 |
PURPOSE:To improve the durability, by fitting an electrode smaller than a diameter of a diaphragm plate on the surface of the diaphragm plate made of a high polymer member, and coating the electrode with an organic protective layer having a diameter smaller than the diameter of the diaphragm plate and larger than the electrode diameter. CONSTITUTION:Flexible piezo-electric substance sheets 111 and 112 using a high polymer material polarized toward the specified broadwise direction are formed with polyfluoride vinylidene, its copolymer or composite material taking them as a matrix and filling inorganic ferrodielectric powder. External electrodes 121 and 122 and internal electrodes 131 and 132 are provided and they are laminated toward the broadwise direction with an organic adhesives 14. The external electrodes 121 and 122 are formed with Al film. Epoxy resin is coaed on the external electrodes 121 and 122 to form organic protective layers 151 and 152. Cr plating layers 1611, 1612, 1621 and 1622 are provided on eletrode terminals 1211, 1212, 1221 and 1222 covered with the layers 151 and 152. A bimorph diaphragm plate thus obtained is clamped with a clamp tool to constitute a piezo-electric electroacoustic converter. |
