Selective anodization of capacitor anode body

Details Selective anodization of capacitor anode body Selective anodization of capacitor anode body

1995-07-13

1997-07-01

Gorgos, Kathryn L.

Electrolysis: processes, compositions used therein, and methods

Product produced by electrolysis involving electrolytic...

205 95, 205122, 205135, 205136, 205171, 205175, 361524, 361529, C25D 1112, C25D 1126, H01G 907

Patent

active

056434324

ABSTRACT:
A method for forming solid electrolytic capacitors provides for anode lead and body surface with increased dielectric thickness as distinguished from a dielectric thickness formed within the inner anode body such that a capacitance value associated therewith is not substantially decreased. The method includes the steps of anodizing the anode to form a predetermined dielectric thickness on the anode and then soaking the anode in a solvent to impregnate an inner portion thereof with the solvent. The solvent is removed from surface areas desired to be coated by a further dielectric layer and thereafter again anodized whereby additional dielectric build-up is limited to the solvent free areas. The solvent is driven off resulting in a capacitor preform which is reinforced by thickened dielectric without capacitance loss which would result from depositing additional dielectric interiorly in the areas insulated from build-up by the solvent.

REFERENCES:
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patent: 4450049 (1984-05-01), Nakata et al.
patent: 4481084 (1984-11-01), Chen et al.
patent: 4520430 (1985-05-01), Long et al.
patent: 4582574 (1986-04-01), Nguyen et al.
patent: 4589056 (1986-05-01), Stimmell
patent: 5167793 (1992-12-01), Jozefowicz

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