Multilayer Ceramic Capacitor Electrode Continuity Design
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Solution Overview
Problem
Existing multilayer ceramic capacitors face a reduction in insulation resistance when dielectric layers are thinned, compromising their performance.
Innovation Solution
The design incorporates a stacked body with dielectric layers and internal electrode layers, where the internal electrode layers have a first region with high continuity and a second region with low continuity, and the internal electrode lead-out portions are defined by the second region, maintaining insulation resistance even with thin dielectric layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the dielectric layer is decreased to improve capacitance, then the capacitance increases, but the insulation resistance decreases
Solution Approach 1:
The internal electrode layer is designed with spatially varying continuity: the first region (central portion) has high continuity of conductive component for effective capacitance, while the second region (peripheral portion near end surfaces) has low continuity to prevent moisture intrusion. This local differentiation allows the dielectric layer to be thin while maintaining insulation resistance.
Solution Approach 2:
The internal electrode layer is segmented into functionally distinct regions: a first region with high conductive component continuity for capacitance function, and a second region with low continuity for insulation protection. This segmentation allows each region to optimize its function independently, resolving the contradiction between capacitance and insulation resistance.
2Quantity of substance
If the dielectric layer thickness is reduced to increase capacitance, then the capacitance improves, but the insulation property between internal electrodes deteriorates
Solution Approach 1:
The internal electrode layer exhibits local quality variation where the central region maintains high conductive continuity for capacitance while peripheral regions near end surfaces have reduced continuity to prevent moisture-related insulation degradation. This allows thin dielectric layers to maintain insulation properties.
Solution Approach 2:
The internal electrode layer structure acts as an intermediary element that mediates between the thin dielectric layer and the external environment. By controlling the continuity of conductive components in different regions, it protects the thin dielectric from moisture intrusion while maintaining electrical function.
Data Source
AI summary
When internal electrode layers are viewed in a stacking direction, the internal electrode layers include an internal electrode main body portion defining an effective region, and an internal electrode lead-out portion that leads to a first or second end surface of a stacked body, and a length of the internal electrode lead-out portion in a width direction of the stacked body is less than or equal to about ½ of a length of the internal electrode main body portion. The internal electrode layer includes a first region having relatively high continuity of a conductive component defining the internal electrode layer, and a second region having relatively continuity of the conductive component. A central portion of the internal electrode main body portion is defined by the first region, and a portion of the internal electrode lead-out portion is defined by the second region.