Nichicon Corporation

Mitsuru Yoneda

Takaya Sakai

Yuichi Kanayama

Shingo Sakata

Kazuhiro Yasukawa

Kenta Kawanishi

Kazuya Yamanaka

Naoya Maruyama

An aluminum electrolytic capacitor includes: an exterior case of a bottomed cylindrical shape for accommodating a capacitor element in which an anode foil and a cathode foil are wound in an overlapping manner with a separator interposed therebetween; and an elastic sealing member for sealing an opening of the exterior case, wherein the exterior case is formed with, on an outer circumferential surface, a plurality of tapered concave portions whose depth in the radial direction becomes shallow from the bottomed cylindrical bottom toward the opening side, whereby a tapered raised portion, which is raised toward the center side in the radial direction, is formed on an inner circumferential surface located on the back surface of the concave portion, and the capacitor element is abutted and supported by the raised portion.

Electronic component

A pressure valve to be arranged in a seal member sealing a casing in which a capacitor element is housed, the pressure valve having a base end positioned within the case and a tip positioned outside the case. The pressure valve includes a tapered portion having a tapered shape. At the top portion of the tapered portion, there is formed a slit able to undergo a state change between a close-state and an open-state by elastic deformation. When the casing internal pressure is less than a certain value, the slit maintains the close-state. When the casing internal pressure has reached the certain value, the slit undergoes a state change to the open-state, whereby the inside and outside of the case communicate with each other and the internal pressure is released from within the case.

Pressure valve and electrolytic capacitor

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.

Capacitor

Growing community of inventors

Kyoto, Japan

Mitsuru Yoneda