CPC H01G 4/30 (2013.01) [H01G 2/065 (2013.01); H01G 4/012 (2013.01); H01G 4/232 (2013.01)] | 9 Claims |
1. A multilayer ceramic capacitor comprising:
a substantially rectangular parallelepiped multilayer body including a plurality of dielectric ceramic layers and a plurality of internal electrode layers laminated alternately in a lamination direction, the multilayer body further including a first main surface and a second main surface which are opposed to each other in the lamination direction, a first lateral surface and a second lateral surface which are 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 which are opposed to each other in a length direction orthogonal or substantially orthogonal to the lamination direction and the width direction; and
a pair of external electrodes provided at two ends of the multilayer body in the length direction to cover at least the first end surface and the second end surface, and connected to the internal electrode layers; wherein
a first protrusion is provided at each of four corners on a surface of at least one among the first main surface and the second main surface having a substantially rectangular shape;
the plurality of internal electrode layers include first internal electrode layers and second internal electrode layers which are adjacent to each other in the lamination direction;
each of the first internal electrode layers and the second internal electrode layers includes a counter portion which are opposed to each other in the lamination direction with the dielectric ceramic layer interposed therebetween;
each of the first internal electrode layers includes a first extension portion that extends from an end of the counter portion on the first end surface side toward the first end surface;
each of the second internal electrode layers includes a second extension portion that extends from an end of the counter portion on the second end surface side toward the second end surface;
the pair of external electrodes include a first external electrode that is provided on the first end surface side and connected to the first extension portions, and a second external electrode that is provided on the second end surface side and connected to the second extension portions;
the dielectric ceramic layers include a plurality of first dielectric ceramic layers, each provided between the first internal electrode layers and the second internal electrode layers, a second dielectric ceramic layer that is provided at a region where the internal electrode layers are not provided, between the first dielectric ceramic layers which are opposed to each other with the internal electrode layers interposed therebetween and overlaps in the lamination direction with the first dielectric ceramic layers, and a third dielectric ceramic layer provided at each of the first lateral surface and the second lateral surface of the multilayer body;
the multilayer body includes an inner layer portion in which the first internal electrode layers and the second internal electrode layers are laminated alternately with the plurality of dielectric ceramic layers interposed therebetween, and a pair of outer layer portions made of a ceramic material that sandwiches the inner layer portion in the lamination direction;
the plurality of internal electrode layers include a pair of first edge portions extending in the length direction at two ends in the width direction, and a pair of second edge portions extending in the width direction at two ends of the counter portions in the length direction;
the plurality of dielectric ceramic layers include a first peripheral portion between the pair of first edge portions opposed to each other in the lamination direction, a second peripheral portion between the pair of second edge portions opposed to each other in the lamination direction, and a central region surrounded by the first peripheral portion and the second peripheral portion;
the first peripheral portion and the second peripheral portion are thicker than the central region;
the plurality of dielectric ceramic layers each include intersections where the first peripheral portion and the second peripheral portion intersect with each other;
the plurality of dielectric ceramic layers at the intersections are thicker than the first peripheral portion and the second peripheral portion; and
second protrusions are provided at portions corresponding to the intersections in the lamination direction on at least one selected from the first main surface and the second main surface.
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