| 摘要 |
PURPOSE:To improve capacitor properties and to reduce development of shortcircuit defects greatly by covering an anode lead with hydrophilic heat resistant insulator by making a surface thereof conductive and by carrying out required electrolytic polymerization. CONSTITUTION:An anode lead 7 which is connected to a sintered tantalum element 1 is covered with a dielectric oxide film 2. A part of the lead 7 is further covered with a hydrophilic heat resistant insulator 3. The insulator 3 and the film 2 are made conductive by a conductive polymer film 4 which is formed by chemical oxidative polymerization. Furthermore, a conductive high polymer film 5 is formed by electrolytic polymerization between an external cathode and an anode of a conductor 8 which is in contact with a part of the film 4, and a solid tantalum capacitor is manufactured. According to this constitution, it is possible to realize a small leak current and a large tangent of a loss angle without damaging the film 2, to produce the film 4 uniformly by the insulator 3, thereby making production of the film 5 uniform, to improve capacitor properties and to remarkably reduce development rate of shortcircuit defects. |
