Ube Industries, Inc.

Marcon Electronics Company, Ltd.

High Man Parts Corp. Ltd.

Marcon Electronics Corp. Ltd.

Hiroshi Shimada

Kohei Nakajima

Kiyoshi Sakamoto

Toshio Maruyama

Tsunetomo Nakano

Kazuaki Nishio

Kanji Nakagawa

Kumiko Narisawa

An electrolytic capacitor which can be protected from rupture thereof due to an increased pressure of electrolytically generated hydrogen gas therein and can be continuously used over a long period of time, comprises an electrolytic liquid contained in a closed container, at least one pair of an anode foil and a cathode foil immersed in the electrolytic liquid, alternately superimposed on each other, coiled together and spaced apart by at least one insulating spacer to form an electrolytic capacitor, anode and cathode terminals being respectively connected to the anode and cathode foils and extending to the outside of the container, and a semipermeable membrane element arranged in a portion of the container and having at least one semipermeable membrane which exhibits, a hydrogen gas-permeating rate of 3.6 cm.sup.3 /cm.sup.2 .multidot.1000 hours or more determined at 50.degree. C. under a hydrogen gas partial pressure of 2 kg/cm.sup.2 and a water vapor-permeating rate of 2000 cm.sup.3 /cm.sup.2 .multidot.1000 hours or less determined at 50.degree. C. under a water vapor partial pressure of 1 kg/cm.sup.2 or less, to allow the permeation of hydrogen gas therethrough but not the permeation of the electrolytic liquid.

Electrolytic capacitor

An electrolytic capacitor having very thin spacer layers is produced by a process in which at least two of the surfaces of an anode valve action metal foil and a cathode metal foil are coated with a photosensitive polymer resin solution; the resultant photosensitive polymer resin solution layers are solidified; the solidified photosensitive polymer resin coatings are masked with a negative or positive masking film having a desired pattern and irradiated with an actinic radiation to partly harden the photosensitive polymer resin coatings in accordance with the masking pattern; after removing the masking film, the irradiated photosensitive polymer resin coatings are developed with a developing liquid to provide spacer layers consisting of hardened portions of the photosensitive polymer resin coatings; the anode and cathode metal foils having the spacer layers are superposed on each other in such a manner that at least one spacer layer is located between the superposed anode and cathode metal foils and at least one other spacer layer is located on at least one of the outside surfaces of the superposed anode and cathode metal foils, to provide a laminate; the laminate is wound into a capacitor element; and then the capacitor element is impregnated with an electrolyte.

Process for producing an electrolytic capacitor

A capacitor element is enclosed within a laminated film including at least a plastic film. The laminated film portion surrounding the capacitor element is heat sealed to form an enclosure structure sealing the capacitor element. The sealing width of the sealed portion formed by heat sealing is selected to be within the range of 1 to 20 mm. The thickness of the inner film of the laminated film opposing the capacitor element is selected to be within the range of 70 to 200 .mu.m. A capacitor of improved life time is obtained.

Electric capacitor with enclosure structure consisting of plastic

Growing community of inventors

Nagai, Japan

Hiroshi Shimada