| 摘要 |
<p>PURPOSE:To sufficiently display a function as a varistor even when a thickness of an ineffective layer is made equal to or lower than that of an effective layer and to enhance moistureproofness by a method wherein an insulator is used as the effective layer of a laminate-type voltage nonlinear resistor. CONSTITUTION:An additive such as Bi2O3, CoO, MnO or the like is added to ZnO; they are mixed and baked temporarily; after that, an organic binder, a dispersion medium and a plasticizer are added; a green sheet 1 for effective layer use is manufactured by a doctor blade method. Then, an additive in a very small quantity is added to a metal oxide to be used as an insulator; in addition, an organic binder, a dispersion medium and a plasticizer are added; a green sheet is manufactured by the doctor blade method; this green sheet is used as green sheets 2 for ineffective layer use. Internal electrodes 3, 4 are printed on the green sheet 1 for effective layer use; they are piled up; in addition, the green sheets 2 for ineffective layer use are piled up and pressure-bonded onto the upper part and lower part; this assembly is cut to a prescribed size and sintered. Then, this assembly displays a function of a varistor even when a thickness of the ineffective layers 2 in an uppermost layer and a lowermost layer is made equal to or lower that of the effective layer 1; no problem about moistureproofness arises.</p> |
