Multilayer Ceramic Capacitor Electrode Layout for Stable Mounting
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Solution Overview
Problem
The existing LW reversed type multilayer ceramic capacitors face issues with short circuit failure due to variations in the area and shape of the covering portion, leading to inconsistent solder wetting and tensile stress, which affects self-alignment and mountability.
Innovation Solution
The proposed multilayer ceramic capacitors have a specific dimensional relationship (w>l>t) and external electrode configurations where the dimensions of certain surface portions are smaller than the corresponding dimensions of the main surface portions, reducing solder wetting on lateral surfaces and stabilizing the mountability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the covering portion area and shape are allowed to vary due to base conductor layer and covering conductor layer formation, then manufacturing flexibility is improved, but solder wetting consistency deteriorates leading to short circuit failure
Solution Approach 1:
The patent applies parameter changes by precisely controlling the dimensions of the covering portion relative to the ridge. Specifically, the covering portion is designed to extend beyond the ridge in the first direction by a first distance and in the second direction by a second distance, with the ratio of these distances being controlled within a specific range (0.5 to 2.0). This parameter control ensures consistent solder wetting behavior while maintaining manufacturing feasibility.
Solution Approach 2:
The patent applies local quality by creating asymmetric covering portions with different extension distances in different directions. The covering portion extends by a first distance in the first direction and by a second distance in the second direction, where these distances can be different. This local differentiation optimizes solder wetting in specific areas while preventing short circuit failures between adjacent components.
2Manufacturing precision
If lateral differences in covering portion area and shape exist, then manufacturing variability is reduced, but self-alignment effect deteriorates causing rotation or tilt during mounting
Solution Approach 1:
The patent applies asymmetry by designing the covering portion to have different extension distances in different directions (first distance in first direction, second distance in second direction). This controlled asymmetry creates a specific geometric configuration that maintains manufacturing precision while preserving the self-alignment effect during mounting, preventing rotation or tilt of the component.
3Adaptability or versatility
If the multilayer ceramic capacitor is mounted with great rotation, then mounting flexibility is improved, but short circuit failure occurs due to external electrode straddling lands of different polarity
Solution Approach 1:
The patent applies preliminary action by pre-configuring the covering portion dimensions and shapes during manufacturing to specific ranges and relationships. The covering portion is designed in advance with controlled extension distances (first distance and second distance) and their ratio (0.5 to 2.0), which creates a built-in geometric constraint that prevents the component from being mounted in incorrect orientations, thereby preventing short circuit failures before mounting occurs.
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body having a dimensional relationship of the dimension in the width direction is greater than the dimension in the length direction which is greater than the dimension in the height direction. The dimension in the width direction of a third surface portion of a first external electrode is smaller than the dimension in the width direction of a first surface portion. The dimension in the width direction of an eighth surface portion of a second external electrode is smaller than the dimension in the width direction of a sixth surface portion. The dimensions in the height direction of a fourth surface portion and a fifth surface portion of the first external electrode are smaller than the dimension in the height direction of the first surface portion.