| 摘要 |
PURPOSE:To contrive improvement in the yield of production, the leakage current characteristics and the reliability of the title electrolytic capacitor by a method wherein, before a high temperature vacuum sintering is conducted, a lead and a part of a molded body are fused and hardened by the irradiation of a laser beam. CONSTITUTION:A laser beam 10 is made to irradiate on the lead-buried section in the state wherein a lead wire 9a is buried in a pressure-molded body 9b consisting of valve action metal powder, and a part of the molded body 9b located on the circumference of the lead wire 9a and the lead wire 9a are connected by fusing. Subsequently, the entire electrode 9 is metallic bonded by conducting a high temperature vacuum sintering work. The concentration of oxygen is increased by the local temperature rise on the stage where the laser beam is made to irradiate, and when this part is diffused to all over the electrode 9 by conducting a high temperature vacuum sintering, a highly efficient dielectric oxide film 2 can be formed by the anodic oxidation subsequently performed. As a result, the rejection rate can be lowered, and the improvement in leakage current characteristics and the reliability of the title electrolytic capacitor can be achieved. |
