Capacitor having an oxide film on a surface of a conductive metal base material
AssigneeMurata Manufacturing Co., Ltd.
InventorsTakeo Arakawa, Hiromasa Saeki
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Abstract
A capacitor including a conductive metal base material having a porous part, a dielectric layer on the porous part, an upper electrode on the dielectric layer, and an oxide film on a surface of the conductive metal base material. The oxide film on the surface of the metal base material operates as an insulating layer between a lower electrode and an upper electrode, and the metal base material and the oxide film are preferably integrated so that separation of the insulating layer can be prevented, and a short circuit between the lower electrode and the upper electrode can be suppressed.
Claims18
A capacitor comprising:
- a conductive metal base material having a porous part and a surface;
- an oxide film on the surface of the conductive metal base material;
- a dielectric layer on the porous part and covering the oxide film;
- and
- an upper electrode on the dielectric layer,
- wherein a total thickness of the dielectric layer and the oxide film at a portion where the dielectric layer covers the oxide film is larger than a total thickness of the dielectric layer and the oxide film at a central portion of the porous part.
Dependencies are inferred from the claim text.