Multilayer Ceramic Capacitor Electrode Asymmetry for Short Circuit Prevention
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Solution Overview
Problem
Multilayer ceramic capacitors face issues with short circuits between internal electrodes due to cutting stress and generate acoustic noise during voltage application, which existing designs fail to adequately prevent or reduce.
Innovation Solution
A multilayer ceramic electronic component design featuring internal electrodes with non-overlapping lead out portions and an insulating layer on the ceramic body, where the first lead out portion is longer than the second, and the capacitance part has regions at different distances from the side surface, preventing short circuits and reducing acoustic noise by ensuring proper insulation and increased capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all external electrodes are positioned on a lower surface to improve mounting density and reduce ESL, then mounting density and capacitance are improved, but short circuit between internal electrodes occurs easily due to cutting stress
Solution Approach 1:
The patent applies asymmetry by making the lead out portions of first and second internal electrodes have different lengths. Specifically, the first lead out portion extends longer than the second lead out portion in the length direction of the ceramic body. This asymmetric design ensures that even when electrodes are pushed by cutting stress, the different lengths prevent facing internal electrodes from making contact, thereby preventing short circuits while maintaining high mounting density.
Solution Approach 2:
The patent utilizes the length dimension of the ceramic body to differentiate electrode positions. By extending lead out portions to different lengths along the length direction, the patent creates dimensional separation that prevents short circuits. This dimensional approach allows electrodes to be positioned such that they do not face each other directly, eliminating the short circuit risk while maintaining the lower-surface electrode configuration.
2Reliability
If internal electrodes are designed with different lead out portion lengths to prevent short circuit, then short circuit prevention is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by differentiating only the lead out portions of internal electrodes while keeping the overall electrode structure simple. The first and second internal electrodes have different lead out portion lengths locally, but this differentiation is confined to specific regions and does not complicate the entire electrode design. The capacitance part regions are also locally differentiated in their distances from the side surface, maintaining simplicity in other areas.
3Quantity of substance
If capacitance part includes regions at different distances from side surface to increase capacitance, then capacitance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by designing the internal electrodes with predetermined different lengths during the manufacturing process. The first lead out portion is designed to extend longer than the second lead out portion from the outset, and the capacitance part regions are positioned at predetermined different distances from the side surface. This preliminary design ensures that short circuit prevention and capacitance enhancement are built into the structure before cutting and assembly, reducing the need for high-precision adjustments during manufacturing.
Data Source
AI summary
There is provided a multilayer ceramic electronic component, including a ceramic body including dielectric layers, and having first and second main surfaces, first and second side surfaces and first and second end surfaces; first and second internal electrodes having overlap regions forming a capacitance part, the first internal electrodes having a first lead out portion to be exposed to the first side surface, and being alternately laminated with the second internal electrodes while being insulated therefrom, the second internal electrodes having a second lead out portion; first and second external electrodes connected to the first and second lead out portions, respectively; and an insulating layer formed on the first side surface, wherein a length of the first lead out portion is longer than that of the second lead out portion and the capacitance part has different distances from the first side surface.