Multilayered Ceramic Capacitor Inclined Electrode Overlap
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Solution Overview
Problem
Multilayered ceramic capacitors face limitations in increasing capacitance due to step portions between internal electrodes and dielectric layers, which can lead to cracking and reduced electrode overlap areas, limiting miniaturization and high capacitance requirements in electronic devices.
Innovation Solution
A multilayered ceramic capacitor design with alternately formed internal electrodes having inclined overlap increase parts on their lead-out portions, exposed to a common surface, and covered by an insulating layer, to increase electrode overlap areas and reduce the risk of cracking, while maintaining a mounting surface configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If internal electrodes are printed on ceramic sheets with predetermined thickness to have area smaller than sheet, then capacitor structure is formed, but step portions are generated at margin portions which increase cracking risk and reduce electrode overlap area
Solution Approach 1:
The patent applies curvature by forming rounded corner portions at the margins of internal electrodes instead of sharp right angles. This curvature design eliminates step portions at the corners where dielectric layers and electrodes meet, preventing stress concentration and cracking while maximizing the overlapping area between adjacent electrodes for higher capacitance
2Ease of operation
If all internal electrodes are exposed to the same surface for mounting, then mounting surface is unified, but step portions at margin portions increase cracking possibility and reduce overlapped area
Solution Approach 1:
By forming rounded corner portions at the exposed margins of internal electrodes, the patent eliminates sharp step portions that cause stress concentration. This curvature design maintains the unified mounting surface configuration while preventing cracking and maximizing electrode overlap area for enhanced capacitance
3Volume of moving object
If internal electrode thickness is thinned for miniaturization, then product size is reduced, but capacitance increase is limited
Solution Approach 1:
The patent compensates for reduced electrode thickness by maximizing the overlapping area in the planar dimension through rounded corner design. By optimizing the horizontal overlap area rather than relying on vertical thickness, the capacitor achieves high capacitance in a miniaturized form factor
Solution Approach 2:
The rounded corner portions increase the effective overlapping area between adjacent electrodes compared to sharp rectangular corners, thereby enhancing capacitance without increasing the overall footprint or thickness of the capacitor
Data Source
AI summary
There is provided a multilayered ceramic capacitor including: a ceramic body; a plurality of first and second internal electrodes having first and second lead-out portions overlapped with each other, respectively, and exposed to one surface of the ceramic body; first and second external electrodes formed on one surface of the ceramic body and electrically connected to the first and second lead-out portions, respectively; and an insulating layer formed on one surface of the ceramic body to cover exposed portions of the first and second lead-out portions, wherein the first lead-out portion has a first overlap increase part of which a forward edge has an inclined surface, and the second lead-out portion has a second overlap increase part of which a forward edge has an inclined surface.