Solid electrolytic capacitors and method for manufacturing the same
US5140502A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1991 |
| Grant date | Aug 18, 1992 |
| Priority date | — |
| Expiry date | Mar 12, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G9/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Solid electrolytic capacitors comprise a capacitor element having a valve metal substrate, a dielectric film formed thereon, and a conductive polymer layer formed on the dielectric film. The capacitor element is encased in a resin casing as not directly contacting the element with the resin casing. The capacitance and leakage current characteristics are improved. Alternatively, a capacitor element includes a valve metal substrate, a dielectric film, an inorganic conductive layer and a conductive polymer layer formed on the substrate in this order, wherein the conductive polymer layer is formed after anodization of the inorganic conductive layer bearing substrate. The life of the resulting capacitor is significantly prolonged. This capacitor element may be encased in a resin casing in a manner as set forth above. Methods for manufacturing the solid electrolytic capacitor are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.