Multilayer ceramic capacitor

Abstract

A multilayer ceramic capacitor includes an element body of roughly rectangular solid shape which is constituted by dielectric layers alternately stacked with internal electrode layers having different polarities and which has a pair of principle faces, a pair of end faces, and a pair of side faces, wherein the multilayer ceramic capacitor is such that: external electrodes are formed on the pair of end faces and one principle face of the element body; and on a cross section taken in parallel with one end face of the multilayer ceramic capacitor near the end face, the ratio of area A constituted by the internal electrode layers connected to the external electrode on this end face side and the dielectric layers present between the internal electrode layers, and area B covering the part of the section excluding the external electrodes, A / B, is 0.75 or more.

Description

BACKGROUND[0001]1. Field of the Invention[0002]The present invention relates to a multilayer ceramic capacitor having large effective volume and strong adhesion between its element body and external electrodes.[0003]2. Description of the Related Art[0004]In recent years, the high demand for smaller electronic components to support higher-density electronic circuits used in mobile phones, tablet terminals, and other digital electronic devices is accelerating the development of smaller, larger-capacitance multilayer ceramic capacitors (MLCC) which constitute these circuits.[0005]The capacitance of a multilayer ceramic capacitor is directly proportional to the dielectric constant of the material constituting the dielectric layers that in turn constitute the capacitor, the number of dielectric layers, and the effective internal electrode layer area or specifically the area of the overlapping parts of the internal electrode layers led out to the external electrodes alternately, and is in...

AI Technical Summary

Benefits of technology

The present invention aims to provide a large-capacitance multilayer ceramic capacitor with strong adhesion between its element body and external electrodes, even in severe environments. The technical effects of this invention include a reduction in the number of faces on which external electrodes are formed, in order to prevent the adhesion between the element body and external electrodes from being affected, and the use of a specific adhesive material between the two components to ensure strong and durable adhesion. These improvements enhance the reliability and performance of the multilayer ceramic capacitor.

Problems solved by technology

As proposed in Patent Literature 1, reducing the faces on which external electrodes are formed leads to a drop in the adhesion between the element body and external electrodes and may cause them to separate in a severe environment, which in turn can lower the reliability of the multilayer ceramic capacitor.

However, since this configuration does not ensure enough adhesion between the element body and external electrodes and may lead to lower reliability, means for ensuring adhesion were studied.

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