Multi-layer ceramic capacitor and method of producing the same
A multi-layer ceramic capacitor includes: a ceramic body including a multi-layer chip and a side margin, the multi-layer chip including a capacitance forming unit including internal electrodes laminated in a first direction, positions of end portions of the internal electrodes in a second direction orthogonal to the first direction being aligned with one another within a range of 0.5 μm, and a cover covering the capacitance forming unit in the first direction, the side margin covering the multi-layer chip in the second direction, the ceramic body having a main surface facing in the first direction, a side surface facing in the second direction, an end surface facing in a third direction orthogonal to the above directions, and a corner portion connecting those surfaces; and an external electrode covering the end surface and the corner portion, the corner portion having a surface roughness of 30 nm or more.
1. A multi-layer ceramic capacitor, comprising:
a ceramic body including
a multi-layer chip including
a capacitance forming unit including internal electrodes laminated in a first direction, positions of end portions of the internal electrodes in a second direction being aligned with one another within a range of 0.5 μm in the second direction, the second direction being orthogonal to the first direction, and
a cover that covers the capacitance forming unit in the first direction, and
a side margin that covers the multi-layer chip in the second direction,
the ceramic body having a main surface facing in the first direction, a side surface facing in the second direction, an end surface facing in a third direction orthogonal to the first direction and the second direction, and a corner portion that connects the main surface, the side surface, and the end surface to one another; and
an external electrode that covers the end surface and the corner portion,
wherein the corner portion has a surface roughness Ra of 30 nm or more, and
wherein the surface roughness Ra of the corner portion is larger than a surface roughness Ra of the main surface.
2. The multi-layer ceramic capacitor according to claim 1 , wherein
the corner portion has the surface roughness Ra of 300 nm or less.
3. The multi-layer ceramic capacitor according to claim 1 , wherein
the external electrode has a thickness dimension along the third direction on the end surface, the thickness dimension being 10 μm or less.
4. The multi-layer ceramic capacitor according to claim 1 , wherein
the side margin has a thickness dimension along the second direction, the thickness dimension being 20 μm or less.
5. The multi-layer ceramic capacitor according to claim 1 , wherein
the cover has a thickness dimension along the first direction, the thickness dimension being 20 μm or less.