Multi-layer Ceramic Capacitor Electrode Positioning for Moisture Resistance
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Solution Overview
Problem
Multi-layer ceramic capacitors face challenges in maintaining moisture resistance and achieving high capacitance due to exposure of internal electrodes during the process of providing side margins, which can lead to infiltration of moisture or plating solutions, compromising their performance.
Innovation Solution
A multi-layer ceramic electronic component configuration where the internal electrodes are positioned such that their end portions in one region are inwardly positioned relative to another region, creating a gap at the corner portions, and a method of producing this component involving the formation of side margins and chamfering to ensure moisture resistance and large capacitance, with specific dimensions and conditions for the side margins and covers to maintain the intersectional area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If side margins are provided in a later step to ensure insulation properties, then the intersectional area of internal electrodes can be enlarged, but the internal electrodes become exposed from corner portions during chamfering, leading to reduced moisture resistance
Solution Approach 1:
The patent applies preliminary action by forming the drawn portion with recessed end portions of internal electrodes before the chamfering process. This pre-positioning ensures that even after chamfering removes material from corner portions, the internal electrodes remain covered and exposed only in regions where side margins are present, thus preventing moisture infiltration while maintaining large intersectional area.
Solution Approach 2:
The patent applies local quality by creating a non-uniform distribution of internal electrode end portions across different regions. Specifically, the drawn portion has end portions positioned more inwardly than in the capacitance forming unit, creating localized protection zones at corner portions where chamfering occurs, while maintaining full coverage in central regions for optimal capacitance.
2Area of stationary object
If the side margin dimension is reduced to increase capacitance, then the intersectional area is enlarged, but the distance from outside to internal electrodes decreases, increasing exposure risk
Solution Approach 1:
The patent applies preliminary action by pre-positioning the end portions of internal electrodes in the drawn portion at a more inward location before the chamfering process. This ensures that even when side margin dimensions are reduced to maximize intersectional area, the internal electrodes remain protected at corner portions where chamfering occurs, preventing exposure and moisture infiltration.
Solution Approach 2:
The patent applies local quality by creating different positioning of internal electrode end portions in different regions: in the drawn portion near corner portions, end portions are positioned more inwardly to provide local protection, while in the capacitance forming unit, full coverage is maintained for optimal capacitance.
Data Source
AI summary
A multi-layer ceramic electronic component includes a ceramic body including: a multi-layer unit including a capacitance forming unit including ceramic layers laminated in a first direction and internal electrodes disposed therebetween, a side surface facing in a second direction orthogonal to the first direction, an end surface facing in a third direction orthogonal to the above directions, a drawn portion extending from the capacitance forming unit in the third direction, the internal electrodes being drawn to the end surface, and a cover that covers the capacitance forming unit and the drawn portion in the first direction; and a side margin that covers the side surface. The drawn portion includes a first region and a second region disposed between the cover and the first region, an end portion of each internal electrode in the second region being positioned inward in the second direction relative to that in the first region.