Mutilayer ceramic capacitor
A multilayer ceramic capacitor includes a first counter portion including first and second regions, and a first middle region located between the first and second regions and including coverage higher than coverages thereof, a second counter portion including third and fourth regions, and a second middle region located between the third and fourth regions and including coverage higher than coverage thereof. A thickness of each of the first and second middle regions is about 101.6% or more and about 111.3% or less of a thickness of each of the first, second, third, and fourth regions, and a difference between coverage of each of the first and second middle regions and coverage of each of the first, second, third, and fourth regions is about 2.2 percentage points or more.
1 . A multilayer ceramic capacitor comprising:
a multilayer body including a plurality of dielectric layers that are laminated, a first main surface and a second main surface opposed to each other in a lamination direction, a first lateral surface and a second lateral surface opposed to each other in a width direction orthogonal or substantially orthogonal to the lamination direction, and a first end surface and a second end surface opposed to each other in a length direction orthogonal or substantially orthogonal to the lamination direction and the width direction;
a plurality of first internal electrode layers each on a corresponding one of the plurality of dielectric layers and each exposed at the first end surface;
a plurality of second internal electrode layers each on a corresponding one of the plurality of dielectric layers and each exposed at the second end surface;
a first external electrode on the first end surface and connected to the plurality of first internal electrode layers; and
a second external electrode on the second end surface and connected to the plurality of second internal electrode layers; wherein
each of the plurality of first internal electrode layers includes a first counter portion opposed to a corresponding one of the plurality of second internal electrode layers and a first extension portion extending from the first counter portion toward the first end surface and exposed at the first end surface;
each of the plurality of second internal electrode layers includes a second counter portion opposed to a corresponding one of the plurality of first internal electrode layers and a second extension portion extending from the second counter portion toward the second end surface and exposed at the second end surface;
the first counter portion includes:
a first region adjacent to the first end surface;
a second region adjacent to the second end surface; and
a first middle region between the first region and the second region and including coverage higher than coverage of the first region and coverage of the second region;
the second counter portion includes:
a third region adjacent to the second end surface;
a fourth region adjacent to the first end surface; and
a second middle region located between the third region and the fourth region and including coverage higher than coverage of the third region and coverage of the fourth region;
a thickness of each of the first middle region and the second middle region is about 101.6% or more and about 111.3% or less of a thickness of each of the first region, the second region, the third region, and the fourth region; and
a difference between coverage of each of the first middle region and the second middle region and coverage of each of the first region, the second region, the third region, and the fourth region is about 2.2 percentage points or more.
2 . The multilayer ceramic capacitor according to claim 1 , wherein the thickness of each of the first middle region and the second middle region is about 101.6% or more and about 109.8% or less of the thickness of each of the first region, the second region, the third region, and the fourth region.
3 . The multilayer ceramic capacitor according to claim 1 , wherein the difference between coverage of each of the first middle region and the second middle region and the coverage of each of the first region, the second region, the third region, and the fourth region is about 2.2 percentage points or more and about 11.4 percentage points or less.
4 . The multilayer ceramic capacitor according to claim 1 , wherein
a length of the first middle region in the length direction is shorter than a distance between the first external electrode and the second external electrode; and
a length of the second middle region in the length direction is shorter than the distance between the first external electrode and the second external electrode.
5 . The multilayer ceramic capacitor according to claim 1 , wherein
the multilayer body includes exposed portions each exposed from the first external electrode and the second external electrode, first covered portions each covered by the first external electrode, and second covered portions each covered by the second external electrode;
a distance in the lamination direction at a center of each of the exposed portions in the length direction is longer than a maximum distance in the lamination direction between surfaces adjacent to the first main surface and the second main surface of each of the first covered portions and the second covered portions, and shorter than a maximum distance in the lamination direction between a first main surface-side surface and a second main surface-side surface of each of the first external electrode and the second external electrode, the first main surface-side surface and the second main surface-side surface each functioning as an outermost surface and being exposed to outside.
6 . The multilayer ceramic capacitor according to claim 1 , wherein
the first main surface includes a first exposed surface exposed from the first external electrode and the second external electrode, a first covered portion covered by the first external electrode, and a second covered surface covered by the second external electrode; and
the first exposed surface includes a first flat surface parallel or substantially parallel to the lamination direction, a first sloped surface coupling the first flat surface and the first covered surface, and a second sloped surface coupling the first flat surface and the second covered surface.
7 . The multilayer ceramic capacitor according to claim 6 , wherein a length of the first sloped surface in the length direction and a length of the second sloped surface in the length direction are shorter than a length of the first flat surface in the length direction.
8 . The multilayer ceramic capacitor according to claim 1 , wherein
a dimension of the multilayer body in the length direction is about 0.2 mm or more and about 6 mm or less;
a dimension of the multilayer body in the lamination direction is about 0.05 mm or more and about 5 mm or less; and
a dimension of the multilayer body in the width direction is about 0.1 mm or more and about 5 mm or less.
9 . The multilayer ceramic capacitor according to claim 1 , wherein each of the plurality of dielectric layers includes BaTiO 3 , CaTiO 3 , SrTiO 3 , or CaZro 3 as a main component.
10 . The multilayer ceramic capacitor according to claim 9 , wherein each of the plurality of dielectric layers includes a Mn compound, an Fe compound, a Cr compound, a Co compound, or a Ni compound as a secondary component.
11 . The multilayer ceramic capacitor according to claim 1 , wherein a thickness of each of the plurality of dielectric layers is about 0.2 μm or more and about 10 μm or less.
12 . The multilayer ceramic capacitor according to claim 1 , wherein a number of the plurality of dielectric layers is fifteen or more and 1200 or less.
13 . The multilayer ceramic capacitor according to claim 1 , wherein each of the plurality of first and second internal electrodes includes Ni, Cu, Ag, Pd or Au, or an alloy including at least one of Ni, Cu, Ag, Pd or Au.
14 . The multilayer ceramic capacitor according to claim 1 , wherein a thickness of each of the plurality of first and second internal electrodes is about 0.2 μm or more and about 2.0 μm or less.
15 . The multilayer ceramic capacitor according to claim 1 , wherein a number of the plurality of first and second internal electrodes is fifteen or more and 1000 or less.
16 . The multilayer ceramic capacitor according to claim 1 , wherein
the first external electrode includes a first base electrode layer and a first plated layer; and
the second external electrode includes a second base electrode layer and a second plated layer.
17 . The multilayer ceramic capacitor according to claim 16 , wherein each of the first and second base electrode layers is a fired layer including a metal component and a glass component or a ceramic component.
18 . The multilayer ceramic capacitor according to claim 17 , wherein the metal component is at least one of Cu, Ni, Ag, Pd, Ag—Pd alloys, or Au.
19 . The multilayer ceramic capacitor according to claim 17 , wherein the ceramic component includes at least one of BaTiO 3 , CaTiO 3 , (Ba, Ca) TiO 3 , SrTiO 3 , or CaZro 3 .
20 . The multilayer ceramic capacitor according to claim 16 , wherein a thickness of each of the first and second base electrode layers is about 3 μm or more and about 200 μm or less in a middle of the respective first and second base electrode layers.