PURPOSE: To enhance the life stability while enabling the title solid electrolytic capacitor to be provided with miniaturized size and large capacitance by a method wherein a conductive high molecular film is formed by electrolytic polymerization while a dielectric film a manganese oxide film are formed by anode oxidization or anode formation on the surface of an anode valve metal and then a capacitor element with cathode lead is inserted into a case having a chamfered opening to provide sealing by encapsulant with an epoxy resin or silicone resin.
CONSTITUTION: A solid electrolyte comprising a manganese oxide layer and a conductive high molecular layer is formed on an anode valve metallic foil whereon a dielectric film is formed by anode oxidization or anode formation and then a capacitor element 1 fitted with a cathode lead is inserted into a case having a chamfered opening part so as to provide an encapsulant 3 sealed with an epoxy resin or silicone resin 2. A sealing material 2 is easily poured from the chamferred opening while the capacitor element 1 can be perfectly covered with the encapsulant resin in excellent thermal resistance, chemical resistance, dimensional safety, etc. In such a constitution, it is recommended that the conductive high molecular film is to be formed by electrolytic polymerization in a solution containing pyrrole, thiophene or at least one kind of their derivatives and a holding electrolyte while either aluminum or tantalum is to be used for the anode valve metal.
FUKUYAMA MASAO
KUDO YASUO
TSUCHIYA SOJI
