Multilayer Ceramic Capacitor Electrode Width Variation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayer ceramic capacitors face performance degradation due to moisture absorption, leading to potential short circuits and reduced capacity when attempting to prevent these issues by increasing the distance between electrodes.
Innovation Solution
The design includes a laminate structure with rectangular insulating layers and capacitor conductors, where the width of the conductors varies between regions to maintain high capacity while preventing performance degradation, with external electrodes covering exposed portions to prevent moisture absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the surface of the laminate and the outer periphery of the electrode is increased to prevent moisture absorption, then the insulating properties are improved, but the area of the electrode is decreased and the capacity of the capacitor is decreased
Solution Approach 1:
The electrode width is made non-uniform across different regions of the insulating layer. Specifically, the electrode has a greater width in regions closer to the insulating layer surface and a reduced width in regions closer to the laminate center. This local variation allows the electrode to maintain sufficient area for high capacity while keeping the distance to the laminate surface adequate for moisture protection.
Solution Approach 2:
The electrode structure transitions from a simple planar configuration to a three-dimensional stepped configuration with different width levels. This dimensional change enables the electrode to optimize both its surface area (for capacity) and its vertical positioning relative to the laminate surface (for moisture protection), effectively resolving the contradiction between these two requirements.
2Quantity of substance
If the area of the electrode is increased to maintain high capacity, then the capacity of the capacitor is improved, but the distance to the surface of the laminate is decreased and moisture absorption occurs causing short circuit
Solution Approach 1:
The electrode width varies locally across different regions. The electrode has a larger width in outer regions to maintain capacity while being positioned at an optimal distance from the laminate surface, and a smaller width in inner regions where it approaches the surface, thus preventing moisture absorption while maintaining overall high capacity.
Solution Approach 2:
The electrode can be viewed as segmented into different width regions (first width in outer regions, second width in inner regions). This segmentation allows different portions of the electrode to serve different functions: outer portions maximize capacity while inner portions maintain insulation, collectively resolving the contradiction between capacity and reliability.
Data Source
AI summary
In an electronic component, a first capacitor conductor includes a first exposed portion exposed between insulating layers at a surface of a laminate including a first shorter side and two longer sides. A second capacitor conductor includes a second exposed portion exposed between the insulating layers at a surface of the laminate including a second shorter side and the two longer sides. First and second external electrodes are arranged on the laminate so as to cover the first and the second exposed portions, respectively. A first width of the first capacitor conductor in a region located between the second shorter side and a first straight line obtained by connecting two edges of the second external electrode is greater than a width of the first capacitor conductor in a region located between the first straight line and a straight line obtained by connecting two edges of the first external electrode.