Multi-Layered Ceramic Capacitor with Pyramid Electrodes
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Solution Overview
Problem
Multi-layered ceramic capacitors face challenges in reducing resistance loss, particularly at higher frequencies, due to inherent dielectric and resistance losses, which affect their quality factor (Q) and overall performance in electronic devices.
Innovation Solution
The design involves a multi-layered ceramic capacitor with internal electrode groups having varying lengths and widths, where each internal electrode group includes 2N or 2N+1 electrodes with specific length and width relationships, ensuring equal opposing areas to optimize equivalent series resistance (ESR) by controlling the N value, thereby improving resistance loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the length of internal electrodes is uniform, then the manufacturing process is simple, but the resistance loss is high due to current concentration
Solution Approach 1:
The patent applies local quality by making the internal electrodes have different lengths along the stacking direction. Specifically, electrodes in the same group have progressively decreasing lengths from the center toward the outer layers, creating non-uniform current distribution that reduces concentration and resistance loss in specific regions while maintaining overall capacitor performance.
Solution Approach 2:
The patent segments the internal electrodes into multiple groups (first internal electrode group and second internal electrode group) with different length configurations. Each group contains electrodes with specific length relationships (L1>L2>L3 or L1>L2=L3), creating segmented current paths that distribute current flow more effectively and reduce overall resistance loss.
2Reliability
If the number of internal electrodes is increased, then the capacitance increases, but the resistance loss also increases due to more electrode interfaces
Solution Approach 1:
The patent divides the internal electrodes into multiple groups with specific length relationships. By configuring electrodes in groups where L1>L2>L3 or L1>L2=L3, the current is distributed across different electrode interfaces in a controlled manner, reducing the cumulative resistance effect while maintaining high capacitance through the increased number of electrodes.
Solution Approach 2:
The patent changes the length parameter of internal electrodes systematically within each group. By establishing specific length relationships (L1>L2>L3 or L1>L2=L3) and controlling the opposing areas between adjacent electrodes, the electrode structure optimizes both capacitance formation and current distribution, achieving high quality factor with reduced resistance loss.
3Loss of energy
If the opposing areas between adjacent internal electrodes are non-uniform, then the capacitance distribution is flexible, but the current flow becomes uneven increasing resistance loss
Solution Approach 1:
The patent applies local quality by carefully controlling the opposing areas between adjacent internal electrodes within each group. The configuration ensures that electrodes with different lengths (L1, L2, L3) create specific opposing area relationships that promote uniform current flow locally, reducing resistance loss while maintaining the ability to adjust capacitance distribution through the length variations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the ESR reducing effect by uniformly distributing current flow and increasing the quality factor (Q), effectively addressing resistance loss issues across different frequency regions.
Implementation Method 1
having the ceramic layer therebetween, and including 2N or 2N+1 (N is an integer number larger than 1) internal electrodes electrically connected to the first and second external electrodes
Implementation Method 2
the internal electrodes in the outside direction have a length shorter than the adjacent internal electrodes in the central direction
Data Source
AI summary
There is provided a multi-layered ceramic capacitor with reduced internal resistance by forming internal electrode groups including internal electrodes having different lengths. The multi-layered ceramic capacitor of the present invention includes a sintered ceramic body part in which cover layers are provided on both surfaces thereof as an outermost layer and a plurality of ceramic layers are stacked therebetween, first and second external electrodes each formed on an outer surface of the sintered ceramic body part, a plurality of first and second internal electrode groups adjacent to each other in a stacking direction of the plurality of ceramic layers, having the ceramic layer therebetween, and including 2N or 2N+1 (N is an integer number larger than 1) internal electrodes electrically connected to the first and second external electrodes, wherein the 2N or 2N+1 (N is an integer number larger than 1) internal electrodes are disposed to face at least one internal electrode of other adjacent internal electrode groups. A length of each internal electrode has a pyramid shape.