Multilayer ceramic capacitor
AssigneeMurata Manufacturing Co., Ltd.
InventorShuichi Ito
Life of this patent
Estimating the term…
Abstract
In a multilayer ceramic capacitor, a ceramic body includes dielectric layers and inner electrodes stacked in a stacking direction, outer electrodes on the ceramic body and connected to the plurality of inner electrodes. When viewing a first cross section of the ceramic body parallel or substantially parallel to first and second side surfaces of the ceramic body and having the plurality of inner electrodes exposed, a connection proportion is about 30% to about 70% and is a proportion of a number of the inner electrodes connected to the outer electrodes to a number of all of the plurality of inner electrodes exposed at the first cross section, and when the first cross section is viewed, glass is present between one of the inner electrodes not connected to each of the outer electrodes, and each of the outer electrodes.
Claims7
A multilayer ceramic capacitor comprising:
- a ceramic body including a first main surface and a second main surface opposed to each other, a first end surface and a second end surface perpendicular or substantially perpendicular to the first main surface and opposed to each other, a first side surface and a second side surface perpendicular or substantially perpendicular to the end surfaces and opposed to each other, a plurality of dielectric layers including dielectric ceramic and a plurality of inner electrodes which are stacked in a stacking direction connecting the first main surface and the second main surface;
- and
- outer electrodes provided on the ceramic body, and connected to the plurality of inner electrodes;
- wherein
- when a first cross section of the ceramic body is viewed, the first cross section being parallel or substantially parallel to the first and second side surfaces and having the plurality of inner electrodes exposed, a connection proportion is in a range of about 30% to about 70%, the connection proportion being a proportion of a number of the inner electrodes connected to the outer electrodes to a number of all of the plurality of inner electrodes exposed at the first cross section;
- when the first cross section is viewed, glass is present between an unconnected inner electrode that is one of the plurality of inner electrodes not connected to each of the outer electrodes, and each of the outer electrodes;
- the outer electrodes include a first outer electrode provided on the first end surface, and a second outer electrode provided on the second end surface;
- the plurality of inner electrodes include a plurality of first inner electrodes and a plurality of second inner electrodes stacked alternately, the plurality of inner electrodes is exposed at the first end surface, the plurality of second inner electrodes is exposed at the second end surface;
- when the first cross section is viewed, glass is present between a first unconnected one of the plurality of inner electrodes that is not connected to the first outer electrode among the plurality of first inner electrodes and the first outer electrode;
- when the first cross section is viewed, glass is present between a second unconnected one of the plurality of inner electrodes that is not connected to the second outer electrode among the plurality of second inner electrodes and the second outer electrode;
- and
- when the first cross section is viewed, a formula (1):
- (t1+t2)×5>D>(t1+t2)×0.5 (1),
- is satisfied where D represents one of a distance between the first unconnected one of the plurality of inner electrodes and the first outer electrode, and a distance between the second unconnected one of the plurality of inner electrodes and the second outer electrode, t1 represents an average thickness of the plurality of dielectric layers sandwiched between the plurality of first inner electrodes and the plurality of second inner electrodes, and t2 represents an average thickness of the plurality of inner electrodes.
Dependencies are inferred from the claim text.