Patent ID: 9099247
Filing Date: 2015-08-04
Classification: H01G

Abstract:
1. A multilayer ceramic capacitor comprising: a body including conductive layers and ceramic dielectric layers alternately stacked on each other in a thickness direction; and a plurality of outer electrodes disposed on portions of the body; wherein the body includes first and second principal surfaces opposing each other in the thickness direction, first and second end surfaces opposing each other in a length direction, and first and second side surfaces opposing each other in a width direction; the plurality of outer electrodes includes a first outer electrode covering at least the first end surface and a second outer electrode covering at least the second end surface; some of the conductive layers include a first effective portion and a first extension portion extending from the first effective portion toward the first end surface and connecting to the first outer electrode, and others of the conductive layers include a second effective portion and a second extension portion extending from the second effective portion toward the second end surface and connecting to the second outer electrode; the body includes a multilayer unit including an effective portion defined by the first and second effective portions and portions of the ceramic dielectric layers stacked therebetween; the body includes a thickness-direction first outer layer section that includes at least one of the ceramic dielectric layers and the first principal surface, a thickness-direction second outer layer section that includes at least another one of the ceramic dielectric layers and the second principal surface, and a thickness-direction inner layer section that includes the multilayer unit and that is disposed between the thickness-direction first and second outer layer sections; a dimension of the thickness-direction second outer layer section in the thickness direction is greater than a dimension of the thickness-direction first outer layer section in the thickness direction; a dimension in the width direction of a second outermost conductive layer of the conductive layers that is closest to the second principal surface is smaller than a dimension in the width direction of a central conductive layer of the conductive layers which is disposed closest to a center of the multilayer unit in the thickness direction; the thickness-direction inner layer section and the thickness-direction first and second outer layer sections contain barium titanate and Si; the thickness-direction second outer layer section includes an outer portion which defines the second principal surface and an inner portion disposed between the thickness-direction inner layer section and the outer portion; a composition ratio of Si to Ti in one of the ceramic dielectric layers included in the outer portion is higher than a composition ratio of Si to Ti in one of the ceramic dielectric layers included in the inner portion; and a boundary portion disposed between the outer portion and the inner portion has a larger Si content than the outer portion.