Multilayer ceramic capacitor and multilayer ceramic capacitor-mounted structure
A multilayer ceramic capacitor includes a multilayer body including first and second main surfaces, first and second side surfaces, and first and second end surfaces, first and second inner electrode layers on laminated dielectric layers and extending to the first and second end surfaces, first and second outer electrodes respectively on the first and second end surfaces, a third outer electrode on the first side surface, and a fourth outer electrode on the second side surface. The first inner electrode layers each have a first opposing portion facing the second inner electrode layers, a first extended portion extending from the first opposing portion to the first end surface, and a second extended portion extending from the first opposing portion to the second end surface. The second inner electrode layers each include first and second extension portions that are partially or entirely bent toward the second main surface.
1 . A multilayer ceramic capacitor comprising:
a multilayer body including a plurality of laminated dielectric layers, a first main surface and a second main surface opposite to each other in a height direction, a first side surface and a second side surface opposite to each other in a width direction perpendicular or substantially perpendicular to the height direction, and a first end surface and a second end surface opposite to each other in a length direction perpendicular or substantially perpendicular to the height direction and the width direction;
first inner electrode layers on the plurality of laminated dielectric layers and extending to the first end surface and the second end surface;
second inner electrode layers on the plurality of laminated dielectric layers and extending to the first side surface and the second side surface;
a first outer electrode on the first end surface and connected to the first inner electrode layers;
a second outer electrode on the second end surface and connected to the first inner electrode layers;
a third outer electrode on the first side surface and connected to the second inner electrode layers; and
a fourth outer electrode on the second side surface and connected to the second inner electrode layers; wherein
the first inner electrode layers each include a first opposing portion facing the second inner electrode layers, a first extended portion extending from the first opposing portion to the first end surface, and a second extended portion extending from the first opposing portion to the second end surface;
the second inner electrode layers each include a second opposing portion facing the first inner electrode layers, a first extension portion extending from the second opposing portion to the first side surface, and a second extension portion extending from the second opposing portion to the second side surface;
the first extension portion of at least one of the second inner electrode layers is partially or entirely bent toward the second main surface, and the second extension portion of the at least one of the second inner electrode layers is partially or entirely bent toward the second main surface; and
ends of the first and second extension portions of the at least one of the second inner electrode layers are exposed from the first and second side surfaces, and a distance between the exposed ends of the first and second extension portions and the second main surface is less than a distance between the second opposing portion of the at least one of the second inner electrode layers and the second main surface.
2 . The multilayer ceramic capacitor according to claim 1 , wherein
a degree of bending is defined by I 1 -I 2 /I 1 , where I 1 is a distance of a boundary point between the second opposing portion and the first extension portion or the second extension portion from the second main surface, and I 2 is a distance of an exposed point on the first extension portion or the second extension portion, extended to the side surface, from the second main surface; and
the degree of bending of the first extension portion and the degree of bending of the second extension portion decrease with a decrease in a distance of the first extension portion and the second extension portion to the second main surface.
3 . The multilayer ceramic capacitor according to claim 2 , wherein the degree of bending is about 0.12 or less.
4 . The multilayer ceramic capacitor according to claim 1 , wherein, when a bend start point is defined as a point at which each of the first extension portion and the second extension portion begins to bend, the bend start point is closer to the second opposing portion when it is nearer to the second main surface.
5 . The multilayer ceramic capacitor according to claim 1 , wherein, when a bend end point is defined as a point at which each of the first extension portion and the second extension portion ceases to bend, the bend end point is closer to the second opposing portion when it is nearer to the second main surface.
6 . The multilayer ceramic capacitor according to claim 1 , wherein a number of the second inner electrode layers is not less than 2 and not more than 50.
7 . The multilayer ceramic capacitor according to claim 1 , wherein a distance in the height direction between the second opposing portion of one of the second inner electrode layers and the second opposing portion of another of the second inner electrode layers nearest to the one of the second inner electrode layers is not less than about 0.08 mm and not more than about 0.54 mm.
8 . The multilayer ceramic capacitor according to claim 1 , wherein a thickness of each of the first inner electrode layers is not less than about 0.5 μm and not more than about 1.1 μm.
9 . The multilayer ceramic capacitor according to claim 1 , wherein a thickness of each of the plurality of dielectric layers is not less than about 1.0 μm and not more than about 15 μm.
10 . The multilayer ceramic capacitor according to claim 1 , wherein a number of the first inner electrode layers is greater than a number of the second inner electrode layers.
11 . A multilayer ceramic capacitor-mounted structure comprising:
a mounting substrate; and
a multilayer ceramic capacitor mounted on the mounting substrate; wherein
the multilayer ceramic capacitor is the multilayer ceramic capacitor according to claim 1 ;
the mounting substrate includes a core material of the substrate, a first connecting conductor on the core material and connected to the first outer electrode, a second connecting conductor on the core material and connected to the second outer electrode, a third connecting conductor on the core material and connected to the third outer electrode, and a fourth connecting conductor on the core material and connected to the fourth outer electrode; and
the multilayer ceramic capacitor is mounted such that the second main surface faces the mounting substrate.
12 . The multilayer ceramic capacitor-mounted structure according to claim 11 , wherein
a degree of bending is defined by I 1 -I 2 /I 1 , where I 1 is a distance of a boundary point between the second opposing portion and the first extension portion or the second extension portion from the second main surface, and I 2 is a distance of an exposed point on the first extension portion or the second extension portion, extended to the side surface, from the second main surface; and
the degree of bending of the first extension portion and the degree of bending of the second extension portion decrease with a decrease in a distance of the first extension portion and the second extension portion to the second main surface.
13 . The multilayer ceramic capacitor-mounted structure according to claim 12 , wherein the degree of bending is about 0.12 or less.
14 . The multilayer ceramic capacitor-mounted structure according to claim 11 , wherein, when a bend start point is defined as a point at which each of the first extension portion and the second extension portion begins to bend, the bend start point is closer to the second opposing portion when it is nearer to the second main surface.
15 . The multilayer ceramic capacitor-mounted structure according to claim 11 , wherein, when a bend end point is defined as a point at which each of the first extension portion and the second extension portion ceases to bend, the bend end point is closer to the second opposing portion when it is nearer to the second main surface.
16 . The multilayer ceramic capacitor-mounted structure according to claim 11 , wherein a number of the second inner electrode layers is not less than 2 and not more than 50.
17 . The multilayer ceramic capacitor-mounted structure according to claim 11 , wherein a distance in the height direction between the second opposing portion of one of the second inner electrode layers and the second opposing portion of another of the second inner electrode layers nearest to the one of the second inner electrode layers is not less than about 0.08 mm and not more than about 0.54 mm.
18 . The multilayer ceramic capacitor-mounted structure according to claim 11 , wherein a thickness of each of the first inner electrode layers is not less than about 0.5 μm and not more than about 1.1 μm.
19 . The multilayer ceramic capacitor-mounted structure according to claim 11 , wherein a thickness of each of the plurality of dielectric layers is not less than about 1.0 μm and not more than about 15 μm.
20 . The multilayer ceramic capacitor-mounted structure according to claim 11 , wherein a number of the first inner electrode layers is greater than a number of the second inner electrode layers.