Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Kiyoshi Hirota

Koichi Kojima

Yuichiro Tsubaki

Yuji Mido

Junichi Kurita

Ayumi Kochi

Katsufumi Shimanaka

A cylindrical sealing member for a capacitor has a circular first plane and a circular second plane placed oppositely to the first plane, and is provided with two lead holes that penetrate the first and second planes. This sealing member for a capacitor contains butyl rubber, and inorganic material oblate particles having flat surfaces. The sealing member includes a first portion, and a second portion in the vicinity of an outer circumference of the sealing member as well as in the vicinity of the two lead holes. In the first portion, the inorganic material oblate particles are scattered such that flat surfaces thereof are oriented substantially in parallel with the first plane. In the second portion, the inorganic material oblate particles are scattered such that the flat surfaces thereof are oriented substantially perpendicularly to the first plane.

Sealing member for capacitor and aluminum electrolytic capacitor using the same

A solid electrolytic capacitor having a lowered leakage current characteristic and an improved ESR characteristic; which has been implemented by decreasing the defects contained in the dielectric film of the anode body. It includes a valve metal foil which makes anode and a sintered layer provided on the upper and lower surfaces of the valve metal foil, which sintered layer covering the entire surface of side faces of valve metal foil in three directions with exception of the anode lead portion. A flat plane area of valve metal foil, which makes anode, covered with sintered layer is not less than one half of the flat plane area of sintered layer.

Anode body for solid electrolytic capacitor and solid electrolytic capacitor using the same

The anode member for a solid electrolytic capacitor according to the present invention comprises an anode body made of a valve metal foil having a purity of not less than 99 wt %, and an anode layer formed on the anode body and made of a sintered body of a valve metal powder. By limiting the amount of impurity contained in the valve metal foil to an amount of not more than 1 wt %, impurities in a dielectric oxide film formed by anodic oxidation, namely defects in the dielectric oxide film can be suppressed, so that the resultant solid electrolytic capacitor can have its leakage current lowered with its ESR (equivalent series resistance) being kept low, and that the electrolytic capacitor can be made to have a smaller size and a higher capacitance. The present invention also provides an electrolytic capacitor having a low leakage current, a low ESR, a small size and a high capacitance by using the above novel anode member as well as a method of making the same.

Anode member for a solid electrolytic capacitor, an electrolytic capacitor using the same, and a method of making the same

Growing community of inventors

Osaka, Japan

Kiyoshi Hirota