Patent ID: 6890363

Claim:
A method for producing a solid electrolytic capacitor comprising a metal material having thereon a dielectric film having surface pores and a solid electrolyte formed on a desired position of the dielectric film, said metal material being cut into a predetermined shape and having valve action, wherein the method comprises the steps of linearly coating a masking material solution around the entire circumference in a region undertaking a boundary in an application of electrochemical forming onto said metal material, and heating the solution to form said first masking layer; subjecting an area where a solid electrolyte is formed later to electrochemical forming, the area being defined by the first masking layer on said metal material; further linearly coating said masking material solution around the entire circumference in the region at a predetermined distance from said first masking layer on said electrochemically formed metal material, and heating the solution to form said second masking layer; forming a solid electrolyte in the area exclusive of the space between said first masking layer and said second masking layer out of the area subjected to said electrochemical forming; and cutting said metal material in the space between said first masking layer and said second masking layer, wherein at least the step of forming a second masking layer causes the infiltration of the masking material solution into the pores of the dielectric film and the formation of the masking layer on the infiltrated portion.