Ceramic electronic device with varying roughness terminal electrode
US11302480B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 2020 |
| Grant date | Apr 12, 2022 |
| Priority date | — |
| Expiry date | Jul 17, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G4/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ceramic electronic device including a ceramic body having ceramic layers and internal electrode layers stacked in alternating manner and a terminal electrode formed at an end face of the ceramic body. The terminal electrode includes a base electrode including a metal component and a glass component, an intermediate electrode layer including Ni and formed at an outer face of the base electrode layer, and an upper electrode layer including Pd or Au and formed at an outer face of the intermediate electrode layer. Also, a surface roughness Ra1 of the base electrode layer in the terminal electrode is 5.0 μm or less; or the surface roughness Ra1 of the base electrode layer, a surface roughness Ra2 of the intermediate electrode layer, and a surface roughness Ra3 of the upper electrode layer satisfy a relationship of Ra1>Ra3≥Ra2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.