Multilayer Ceramic Capacitor Asymmetric Electrode Mounting Stability
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Solution Overview
Problem
Multilayer ceramic capacitors often experience mounting defects and short-circuits due to toppling or misalignment during assembly on circuit boards, primarily because their design does not adequately stabilize the component during the mounting process.
Innovation Solution
The multilayer ceramic capacitor is designed with a ceramic body having a thickness greater than its width, featuring external electrodes with thicker regions adjacent to the mounting surface, which shifts the center of gravity below the ceramic body's center, enhancing mounting stability and preventing toppling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the multilayer ceramic capacitor has a conventional design with uniform external electrode thickness, then the manufacturing process is simple, but the mounting stability is poor causing toppling or misalignment during assembly
Solution Approach 1:
The external electrodes are designed with non-uniform thickness distribution, where the thickness varies in the thickness direction of the ceramic body. Specifically, the external electrodes have greater thickness in regions adjacent to one main surface compared to other regions, creating local quality variations that improve mounting stability without requiring complete structural redesign
Solution Approach 2:
The external electrodes exhibit asymmetric thickness distribution relative to the ceramic body's main surfaces. This asymmetry creates an intentional imbalance in mass distribution that shifts the center of gravity, providing a stabilizing effect during mounting while maintaining electrical functionality
2Reliability
If the ceramic body thickness is increased to improve capacitance, then the capacitance value increases, but the occupied area on the board increases
Solution Approach 1:
Instead of increasing capacitance solely through lateral expansion (area increase), the invention utilizes the thickness dimension of the ceramic body. By increasing thickness while maintaining controlled width and length, the capacitor achieves higher capacitance values without proportionally increasing the board occupation area, effectively utilizing three-dimensional space
Data Source
AI summary
A multilayer ceramic capacitor may include: a ceramic body having first and second main surfaces opposing each other in a thickness direction and first and second end surfaces opposing each other in a length direction, a thickness of the ceramic body being greater than a width thereof; a first external electrode disposed on the first end surface and having a greater thickness in a region thereof adjacent to the second main surface than in a region thereof adjacent to the first main surface; a second external electrode disposed on the second end surface and having a greater thickness in a region thereof adjacent to the second main surface than in a region thereof adjacent to the first main surface; and first and second internal electrodes disposed in the ceramic body and connected to the first and second external electrodes, respectively.