CAPACITOR LEAD WIRE, ITS MANUFACTURING METHOD, AND CAPACITOR USING THE SAME

摘要

A capacitor is improved in reliability by suppressing the formation of burrs or protrusions at a joint portion between an aluminum wire round rod and an external terminal in a lead wire used for a capacitor. A metal cap having a higher melting point than aluminum is fitted to an end portion of the aluminum wire round rod and the metal cap is heated, thereby joining the aluminum wire round rod to the metal cap. Thereafter, the external terminal and the metal cap are welded to each other. The metal cap has a curved surface in which an outer periphery is decreased from an opening toward an end portion opposite to the opening. The opening is provided with a stepped portion, so that the sealing degree is increased when the lead wire is inserted into a hole of the sealing member.