Patent ID: 11961675
Assignee: TDK CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A ceramic electronic device comprising:
an element body formed by laminating a ceramic layer and an internal electrode layer; and
an external electrode electrically connected to at least one end of the internal electrode layer,
wherein
the element body includes a boundary layer at an end of the ceramic layer,
a magnitude correlation between α, β, and γ satisfies β>γ>α, where a is a linear expansion coefficient of the ceramic layer, β is a linear expansion coefficient of the external electrode, and γ is a linear expansion coefficient of the boundary layer,
the external electrode includes an interface protrusion on at least a part of a surface of the boundary layer, and
a magnitude correlation between α, β, γ, and δ satisfies β>γ>α>δ, where δ is a linear expansion coefficient of the interface protrusion.