ELECTROLYTIC CAPACITOR AND METHOD OF MANUFACTURING THE SAME

To provide an electrolytic capacitor and a method of manufacturing the same capable of achieving a sufficiently low ESR (equivalent series resistance).SOLUTION: An electrolytic capacitor comprises a capacitor element in which a first separator, anode foil connected with an extraction lead terminal and having an anode oxide film on its surface, a second separator, and cathode foil connected with an extraction lead terminal are sequentially arranged, the capacitor element being formed with conductive polymer and impregnated with an electrolytic solution. Each of the first and second separators is protruded from the anode foil in a surface direction and opposed to each other, and comprises a projection containing the conductive polymer. When a projection length of the projection of the first separator is defined as a length a, a projection length of the projection of the second separator is defined as a length a', and a thickness of the anode foil at a position where the projections of the first separator and the second separator are opposed to each other is defined as a thickness b, a relation of length a+length a'≥thickness b is satisfied. The conductive polymer binds at least a part of the projection of the first separator and at least a part of the projection of the second separator.SELECTED DRAWING: Figure 5 【課題】 十分に低いＥＳＲを実現できる電解コンデンサおよびその製造方法を提供する。【解決手段】 第１セパレータと、引き出しリード端子が接続され表面に陽極酸化被膜を有する陽極箔と、第２セパレータと、引き出しリード端子が接続された陰極箔とが順次配置され、導電性高分子が形成され電解液が含浸されたコンデンサ素子を備え、第１セパレータおよび第２セパレータのそれぞれは、面方向で陽極箔よりも突出して対向し、導電性高分子を含む突出部を備え、第１セパレータの突出部の突出長さを長さａとし、第２セパレータの突出部の突出長さを長さａ´とし、第１セパレータおよび第２セパレータの突出部が対向する箇所における陽極箔の厚みを厚みｂとした場合に、長さａ＋長さａ´≧厚みｂの関係が成立し、導電性高分子は、第１セパレータの突出部の少なくとも一部と、第２セパレータの突出部の少なくとも一部とを結着していることを特徴とする。【選択図】 図５