| abstract |
A three-terminal solid electrolytic capacitor suitable to be built in a circuit boardnwhile reducing the ESL, a board with a built-in three-terminal solid electrolytic capacitor,nand a method for producing them are disclosed. An electrode body (100) for a solidnelectrolytic capacitive element comprises an aluminum foil base (2) the surfacenof which is roughened (the surface area is increased) and on the surface of whichnan aluminum oxide coating which is an insulating oxide coating is formed, twonaluminum foil bases (3a, 3b) the surfaces of which are not roughened, and two foilncopper bases (4a, 4b) serving as metal conductors constituting lead electrodes.nA cathode (14) composed of a solid polymer electrolyte layer (11), a graphitenpaste layer (12), and a silver paste layer (13) is provided on the whole surfacenof the aluminum foil base (2). The solid electrolytic capacitive element (110)nis housed in a substantially closed space defined by first and second insulating sheetsn(21, 22), thus fabricating a board with a built-in three-terminal solid electrolyticncapacitor. |