Patent ID: 11881355
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A multilayer ceramic capacitor comprising:
a multilayer body including a plurality of laminated dielectric layers and a plurality of laminated internal electrodes, the multilayer body further including a first main surface and a second main surface that are opposed to each other in a height direction, a first side surface and a second side surface that are opposed 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 that are opposed to each other in a length direction perpendicular or substantially perpendicular to the height direction and the width direction; and
external electrodes; wherein
the plurality of laminated dielectric layers each include a first dielectric layer and a second dielectric layer;
the plurality of laminated internal electrodes each include a first internal electrode on the first dielectric layer and extending to the first end surface, and a second internal electrode on the second dielectric layer and extending to the second end surface;
the external electrodes include a first external electrode connected to the first internal electrode and provided on the first end surface, and a second external electrode connected to the second internal electrode and provided on the second end surface;
the first internal electrode includes four sides, a first outer peripheral portion in a vicinity of three sides other than one side extending to the first end surface, and a first inner electrode portion inside the first outer peripheral portion;
the second internal electrode includes four sides, a second outer peripheral portion in a vicinity of three sides other than one side extending to the second end surface, and a second inner electrode portion provided inside the second outer peripheral portion;
when a coverage of the first internal electrode relative to the first dielectric layer in the first outer peripheral portion is defined as A1, and a coverage of the first internal electrode relative to the first dielectric layer in the first inner electrode portion is defined as B1, a relationship of A1<B1 is satisfied;
when a coverage of the second internal electrode relative to the second dielectric layer in the second outer peripheral portion is defined as A2, and a coverage of the second internal electrode relative to the second dielectric layer in the second inner electrode portion is defined as B2, a relationship of A2<B2 is satisfied;
the first dielectric layer includes four sides in a region in which the first internal electrode is provided, a first high dielectric constant portion in a vicinity of three sides other than one side located at the first end surface, and a first inner dielectric layer portion located inside the first high dielectric constant portion;
the second dielectric layer includes four sides in a region in which the second internal electrode is provided, a second high dielectric constant portion in a vicinity of three sides other than one side located at the second end surface, and a second inner dielectric layer portion located inside the second high dielectric constant portion;
when a relative dielectric constant of the first dielectric layer in the first high dielectric constant portion is defined as A3, and a relative dielectric constant of the first dielectric layer in the first inner dielectric layer portion is defined as B3, a relationship of A3>B3 is satisfied;
when a relative dielectric constant of the second dielectric layer in the second high dielectric constant portion is defined as A4, and a relative dielectric constant of the second dielectric layer in the second inner dielectric layer portion is defined as B4, a relationship of A4>B4 is satisfied; and
a covering ratio of the first high dielectric constant portion relative to the first outer peripheral portion, and a covering ratio of the second high dielectric constant portion relative to the second outer peripheral portion are about 68% or more and about 187% or less.