Multi-layer ceramic capacitor
US4885661A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1988 |
| Grant date | Dec 5, 1989 |
| Priority date | — |
| Expiry date | Oct 18, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G4/1209
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A mutli-layer ceramic capacitor principally made up of (a) internal electrode layers containing at least copper and (b) ceramic dielectric layers extending between the internal electrode layers. The materials which form the ceramic include copper oxide and an oxide component A and B, which component A is selected from group I of lead, calcium, strontium, and barium, and component B is selected from group II of magnesia, nickel, titanium, zirconium, zinc, niobium, tantalum, and tungsten. The component A includes at least lead and component B includes at least two of the substances in group II, and wherein a ratio between values a and b are chosen so that 0.985<a/b<1.110, where the value a denotes the total mol value of the substances in the component A and the value b denotes the total mol value of the substances in component B. The copper oxide component is present in an amount of about 0.03 to 0.65 wt % in terms of Cu.sub.2 O content.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.