Multilayer Ceramic Capacitor Side Electrode Connectivity
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving miniaturization, high capacitance, and reliability due to issues with electrode connectivity and capacitance formation in compact electronic devices, particularly in mobile communication devices where miniaturization and functionality are increasing demands.
Innovation Solution
A multilayer ceramic capacitor design featuring a ceramic body with internal electrodes and conductive patterns that optimize electrode length ratios, overlap regions, and distances to enhance connectivity and capacitance, including specific dimensions and shapes for the conductive patterns to prevent short-circuits and improve reliability, while maintaining compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the capacitor is miniaturized to meet compactness requirements, then the size is reduced, but the capacitance and reliability deteriorate
Solution Approach 1:
The patent introduces conductive patterns on the dielectric layer surface, extending the electrode connectivity from the traditional end-surface configuration to the side surface configuration. This dimensional change allows for improved electrode connection without increasing the overall capacitor volume, thereby maintaining miniaturization while enhancing capacitance and reliability through better electrode connectivity.
2Reliability
If the internal electrode length is increased to improve capacitance, then the capacitance increases, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the electrode system into internal electrodes within the ceramic body and separate conductive patterns on the dielectric layer surface. This segmentation allows the internal electrodes to maintain optimal length for capacitance while the conductive patterns provide the necessary connectivity and electrical connection, simplifying the overall electrode configuration and reducing manufacturing complexity.
3Reliability
If the conductive pattern overlap region is increased to improve connectivity, then the connectivity improves, but the area occupied increases
Solution Approach 1:
The patent applies conductive patterns with specific local characteristics - they are positioned on the dielectric layer surface and extend toward the internal electrodes with controlled overlap regions. The conductive patterns have varying dimensions and shapes (rectangular, triangular, trapezoidal) optimized for local connectivity needs, providing sufficient electrode connection while minimizing the overall area occupied on the capacitor surface.
Data Source
AI summary
There is provided a multilayer ceramic capacitor including: a ceramic body including a plurality of dielectric layers and having first and second main surfaces opposing each other, first and second side surfaces opposing each other, and first and second end surfaces opposing each other; first internal electrodes each having a first lead part exposed to the first side surface of the ceramic body; second internal electrodes respectively disposed to face the first internal electrodes, having at least one dielectric layer among the plurality of dielectric layers interposed therebetween, and each having a second lead part exposed to the first side surface of the ceramic body; first and second external electrodes connected to the first and second internal electrodes, respectively; a first conductive pattern connected to the second external electrode; and a second conductive pattern connected to the first external electrode.