Multi-Layer Ceramic Capacitor Electrode Thickness Ratio
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Solution Overview
Problem
Multi-layered ceramic capacitors face challenges in achieving high reliability, particularly in moisture resistance, due to limitations in internal and external structures, which are crucial for their integration in vehicles and infotainment systems.
Innovation Solution
The design includes a ceramic body with a dielectric layer and internal electrodes, where the external electrodes are strategically positioned with specific thickness ratios and coverage to enhance moisture resistance and bending strength, ensuring reliable performance in harsh environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the external electrode structure is simplified for ease of manufacture, then manufacturing complexity is reduced, but moisture resistance reliability deteriorates
Solution Approach 1:
The patent applies different thickness ratios of the first electrode layer to different surfaces of the ceramic body. Specifically, the thickness ratio t2/t1 (where t2 is the thickness on the first/second surfaces and t1 is the thickness on the third/fourth surfaces) is controlled within 40% to 120%. This local differentiation provides enhanced moisture resistance at critical surfaces while maintaining manufacturing feasibility through standardized production processes.
Solution Approach 2:
The patent specifies precise parameter ranges for the electrode layer thickness ratios: t2/t1 between 40% and 120%, and t1/BW (where BW is the distance from one end of the first electrode layer to the other end on the first/second surfaces) at 20% or less. By controlling these parameters within specific ranges, the patent achieves optimal balance between moisture resistance and manufacturing ease without requiring complex fabrication processes.
2Reliability
If the electrode layer thickness is increased to improve moisture resistance, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent controls the thickness parameters within specific ranges rather than simply increasing them indefinitely. The ratio t2/t1 is maintained between 40% and 120%, and t1/BW is kept at 20% or less. These parameter constraints ensure adequate moisture resistance while preventing excessive complexity in the electrode structure and fabrication process.
3Volume of moving object
If miniaturization is pursued to meet product requirements, then compactness is improved, but reliability in harsh environments deteriorates
Solution Approach 1:
The patent differentiates the electrode layer thickness across different surfaces of the miniaturized ceramic body. The first electrode layer has optimized thickness distribution with t2/t1 ratio between 40% and 120%, providing enhanced moisture protection at critical surfaces (first and second surfaces) while maintaining the overall compact size of the capacitor.
Solution Approach 2:
The patent addresses moisture resistance in miniaturized capacitors by utilizing the dimensional distribution of electrode thickness across different surfaces. By controlling the thickness ratio t2/t1 and the parameter t1/BW, the patent creates a three-dimensional electrode structure that provides superior moisture protection without increasing the overall volume of the compact capacitor.
Data Source
AI summary
A multi-layered ceramic electronic component includes: a ceramic body including a dielectric layer, and a plurality of internal electrodes facing each other with the dielectric layer interposed therebetween; and an external electrode disposed on an external surface of the ceramic body and electrically connected to the first internal electrodes or the second internal electrodes. The external electrode includes a first electrode layer electrically connected to the internal electrodes and a second electrode layer disposed on the first electrode layer, and a ratio (t1/BW) of a thickness (t1) of a region of the first electrode layer disposed on the third surface or the fourth surface of the ceramic body to a distance (BW) from one end of the first electrode layer to the other end of the first electrode layer disposed on the first surface or the second surface of the ceramic body satisfies 20% or less.