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US 6,310,765 B1Granted
Electrolytic capacitor and method for manufacturing the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMasakazu Tanahashi, Emiko Igaki
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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMasakazu Tanahashi, Emiko Igaki
Estimating the term…
The invention has an object to reduce the impedance and to improve the responsiveness at high frequencies in an electrolytic capacitor having an conducting polymer layer as the cathode. A cathode collector is directly joined with the surface of the dielectric of a valvular metal porous body for anode using a conducting polymer layer but not through various binding layers (for example, a carbon layer and a silver layer) thereby reducing the impedance. A cathode collector is disposed adjacent and opposite to a porous valvular metal foil for anode. This structure ensures that the collecting area is enlarged. In this case, a cathode collector may be directly joined with the surface of the dielectric of a valvular metal porous body for anode using an conducting polymer layer but not through various binding layers thereby reducing the total impedance.
An electrolytic capacitor comprising an anode formed of a valvular metal porous body with a dielectric oxide layer formed on the entire surfaces of the porous body, a cathode composed of a conducting polymer layer formed on and joined with the dielectric oxide layer on the porous body, and a cathode collector joined with the conducting polymer layer, wherein the cathode collector is a metal plate or foil having a metal surface which is (1) roughened in contact to the conducting polymer layer, (2) provided with carbon particles embedded therein in contact to the conducting polymer layer, or (3) provided with a carbon layer conductively fixed thereto in contact to the conducting polymer layer, the metal surface facing the conducting polymer layer.
Dependencies are inferred from the claim text.