Nichicon Corporation

Naoya Maruyama

Mitsuru Yoneda

The present application provides a capacitor in which the operability of the pressure valve, and valve deformation during operation, can be stabilized. A capacitor () comprising: a capacitor element () obtained by overlapping and winding a positive electrode foil () and a negative electrode foil () with an electrolytic paper () interposed therebetween, and impregnating the foils with an electrolytic solution; a bottomed cylindrical outer case () for housing the capacitor element (); and a sealing body () for sealing the opening of the outer case (). The inner bottom part of the outer case () has formed thereon a recess () having: a first inclined surface () spreading in a radial manner from the center region of the inner bottom part, the center region being the deepest part; and a second inclined surface () which is continuous from the outer edge of the first inclined surface () and which is steeper than the first inclined surface (). A weakened section is formed in the recess, and a groove is formed on the outside of the inner bottom part of the outer case.

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Kyoto, Japan

Naoya Maruyama