US 6,982,865 B2
Solid electrolytic capacitor
Yohei Kawata, Hirakata (Japan); Fumio Tatezono, Hirakata (Japan); Seiji Omura, Daito (Japan); and Kouhei Gotou, Higashiosaka (Japan)
Assigned to Sanyo Electric Co., Ltd., Osaka (Japan)
Filed on Oct. 01, 2004, as Appl. No. 10/954,481.
Claims priority of application No. 2003-349072 (JP), filed on Oct. 08, 2003.
Prior Publication US 2005/0078435 A1, Apr. 14, 2005
Int. Cl. H01G 9/00 (2006.01)
U.S. Cl. 361—525 8 Claims
OG exemplary drawing
 
1. A solid electrolytic capacitor formed with a dielectric coating and a solid electrolyte layer successively formed on a surface of an anode body; wherein
said solid electrolyte layer includes a conductive polymer containing at least
a tetrahydronaphthalenesulfonate ion expressed as a general formula (1)
OG Complex Work Unit Drawing
 (in the formula, m1 represents an integer not less than 0, p represents an integer not less than 1, and R1 represents an alkyl group having a carbon number of 1–20) and
a naphthalenesulfonate ion expressed as a general formula (2)
OG Complex Work Unit Drawing
 (in the formula, m2 represents an integer not less than 0, q represents an integer not less than 1, and R2 represents an alkyl group having a carbon number of 1–20, and the formula includes any naphthalenesulfonate ion having an alkyl group and a sulfonate ion group each substituting for a hydrogen atom in at least one of aromatic rings)
as dopants.