Patent ID: 9640322
Date: 2017-05-02
CPC Classifications: H01G

Claim:
1. A monolithic ceramic capacitor comprising: an element body including a multilayer portion including a plurality of conductor layers and a plurality of ceramic dielectric layers alternately stacked in a thickness direction of the element body; and an outer electrode provided on an outer portion of the element body; wherein outer surfaces of the element body include a first principal surface and a second principal surface that are opposed to each other in the thickness direction, a first end surface and a second end surface that are opposed to each other in a length direction perpendicular or substantially perpendicular to the thickness direction, and a first side surface and a second side surface that are opposed to each other in a width direction perpendicular or substantially perpendicular to both the thickness direction and the length direction; the element body is divided in the thickness direction into a thickness-direction first outer layer portion that includes a first ceramic dielectric layer and defines the first principal surface, a thickness-direction second outer layer portion that includes a second ceramic dielectric layer and defines the second principal surface, and a thickness-direction inner layer portion including the multilayer portion and located between the thickness-direction first outer layer portion and the thickness-direction second outer layer portion; among the plurality of conductor layers included in the thickness-direction inner layer portion, a first conductor layer arranged at a position closest to the first principal surface is provided at a position adjacent to the first ceramic dielectric layer of the thickness-direction first outer layer portion; among the plurality of conductor layers included in the thickness-direction inner layer portion, a second conductor layer arranged at a position closest to the second principal surface is provided at a position adjacent to the second ceramic dielectric layer of the thickness-direction second outer layer portion; the outer electrode includes a first outer electrode provided to cover the first end surface, and a second outer electrode provided to cover the second end surface; one portion of the plurality of conductor layers is connected to the first outer electrode through a first wiring portion extending from the multilayer portion toward the first end surface side; another portion of the plurality of conductor layers is connected to the second outer electrode through a second wiring portion extending from the multilayer portion toward the second end surface side; the element body is divided in the length direction into a length-direction first outer layer portion that includes portions of the conductor layer and the ceramic dielectric layer corresponding to the first wiring portion and defines the first end surface, a length-direction second outer layer portion that includes portions of the conductor layer and the ceramic dielectric layer corresponding to the second wiring portion and defines the second end surface, and a length-direction inner layer portion that includes the multilayer portion and is located between the length-direction first outer layer portion and the length-direction second outer layer portion; a conductor density in a length-direction first end portion region located at the first end surface side in the multilayer portion, and a conductor density in a length-direction second end portion region located at the second end surface side in the multilayer portion are lower than a conductor density in a length-direction center portion region located at a center in the length direction in the multilayer portion; the element body is divided in the width direction into a width-direction first outer layer portion that includes the ceramic dielectric layer and defines the first side surface, a width-direction second outer layer portion that includes the ceramic dielectric layer and defines the second side surface, and a width-direction inner layer portion that includes the multilayer portion and is located between the width-direction first outer layer portion and the width-direction second outer layer portion; a conductor density in a width-direction first end portion region located at the first side surface side in the multilayer portion, and a conductor density in a width-direction second end portion region located at the second side surface side in the multilayer portion are lower than a conductor density in a width-direction center portion region located at the center in the width direction in the multilayer portion; and the conductor densities of the first conductor layer and the second conductor layer are lower than the conductor densities in the length-direction first end portion region, the length-direction second end portion region, the width-direction first end portion region, and the width-direction second end portion region, by about 10%.