Multi-Layer Ceramic Capacitor Electrode Design for Flexural Strength
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Solution Overview
Problem
Low-profile multi-layer ceramic capacitors with ceramic bodies of 50 μm or less thickness face challenges in ensuring strength in the thickness direction, as existing techniques fail to provide sufficient flexural strength.
Innovation Solution
The design incorporates first and second external electrodes with extended portions that cover end surfaces and extend to main surfaces, creating a stress difference between main surfaces, thereby improving flexural strength by dispersing stress and applying compression or contraction stress to the second main surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the ceramic body is made thinner to reduce component height, then the profile is lowered, but the flexural strength in the thickness direction deteriorates
Solution Approach 1:
The patent applies local quality by creating asymmetric stress distribution across the ceramic body thickness. Extended portions are provided only on specific main surfaces (first and/or second main surfaces) while leaving other surfaces without extensions, creating localized stress differences that improve flexural strength specifically in the thickness direction without increasing overall component height
Solution Approach 2:
The patent transitions from uniform thickness design to asymmetric thickness design by extending external electrodes on specific surfaces only. This dimensional asymmetry creates stress differences across the thickness direction, transforming the stress distribution from uniform to gradient-based, thereby improving flexural strength while maintaining low profile
2Length of stationary object
If external electrodes are made thinner to reduce height, then the component profile is lowered, but the stress distribution in the ceramic body becomes insufficient
Solution Approach 1:
The extended portions are selectively provided on specific main surfaces rather than uniformly across all surfaces. This local differentiation creates targeted stress concentration zones that improve overall stress distribution in the ceramic body, allowing thinner electrode designs that maintain adequate stress distribution
Data Source
AI summary
A multi-layer ceramic electronic component includes: a ceramic body including first and second main surfaces facing in a first axis direction, first and second end surfaces facing in a second axis direction, and first and second internal electrodes; a first external electrode including a first cover portion covering the first end surface, and a first extended portion extending from the first cover portion to the second main surface; and a second external electrode including a second cover portion covering the second end surface, and a second extended portion extending from the second cover portion to the second main surface, the multi-layer ceramic electronic component satisfying that, when T1 represents a dimension of the ceramic body in the first axis direction and T2 represents a dimension of each extended portion in the first axis direction, T1+T2 is 50 μm or less, and T2/(T1+T2) is 0.32 or less.