Matsushita Electric Industrial Co., Ltd.

Kazunari Hayashi

Mitsuhisa Yoshimura

Yoshihiro Watanabe

Kazumitsu Honda

Hisao Nagara

Ryoko Takaoka

Hiromi Nakanishi

Naomi Kurihara

Takehiko Nakahara

An aluminum electrolytic capacitor produced by winding an anode foiland a cathode foilvia a separatorimpregnated with a driving electrolyte solution, wherein the driving electrolyte solutioncomprises a polar solvent, at least one electrolyte selected from inorganic acids, organic acids, inorganic acid salts, and organic acid salts, and a random copolymer of polyoxyethylene and polyoxypropylene having a hydroxy group at one end and a hydrogen group at the other end and the separatoris formed by overlaying a cellulosic fiber-mixed paper, a cellulosic fiber paper, and a cotton linter. The present invention provides a long-lasting driving electrolyte solution higher in electric conductivity and superior in the chemical self-restoring ability and heat resistance at high temperature, and an aluminum electrolytic capacitor using the same.

Aluminum electrolytic capacitor

A method of manufacturing electrode foil for aluminum electrolytic capacitors and an AC power supply unit used therewith are disclosed. An etching is performed on an aluminum foil immersed in an electrolytic solution by applying an AC current to a pair of electrodes in the electrolytic solution. A waveform of the AC current is a deformed sine wave including a period of time (a) when an electric current rises from zero to a peak value, and another period of time (b) when the electric current falls from the peak value to zero. With the periods of time (a) and (b) made different from each other, the surface area of the aluminum foil is efficiently expanded by the etching and an enhancement of electric capacity of the electrode foil is obtained.

Method of manufacturing electrode foil for aluminum electrolytic capacitor and AC power supply unit

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Uji, Japan

Kazunari Hayashi