Laminated Ceramic Capacitor Side Electrode Design for Moisture Resistance
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Solution Overview
Problem
Laminated ceramic capacitors face issues with water infiltration due to thin side-surface outer electrodes, which compromises moisture resistance reliability, especially when attempting to minimize component size for increased capacitance.
Innovation Solution
A laminated ceramic electronic component design featuring a strip-shaped side-surface outer electrode with wrap-around electrode portions that extend to cover exposed inner electrodes, ensuring sufficient thickness and preventing water infiltration without increasing the component's dimensions, achieved through a double-coating conductive paste application method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the side-surface outer electrode is decreased to increase the proportion of electrostatic capacity with respect to component volume, then the electrostatic capacity proportion increases, but the electrode thickness at end portions becomes insufficient allowing water infiltration
Solution Approach 1:
The patent applies different thickness requirements to different portions of the side-surface outer electrode. The end portions (first and second end portions) are designed with a first thickness to prevent water infiltration, while the intermediate portion can have a different thickness. This local differentiation allows the electrode to provide sufficient protection at vulnerable end areas while optimizing overall capacitance proportion.
Solution Approach 2:
The patent establishes minimum thickness requirements for the end portions of the side-surface outer electrode before final electrode formation. By predeterminedly setting these thickness constraints during the design and manufacturing process, the patent ensures that water infiltration is prevented from the outset, rather than attempting to address it after the fact.
2Reliability
If the entire thickness of the side-surface outer electrode is increased to prevent water infiltration, then moisture resistance reliability improves, but the proportion of electrostatic capacity with respect to volume decreases
Solution Approach 1:
The patent specifies that only the end portions of the side-surface outer electrode need to have sufficient thickness (first thickness) to prevent water infiltration, while the intermediate portion can have a reduced thickness. This localized thickness distribution prevents water infiltration at critical areas without unnecessarily increasing the overall electrode thickness, thereby maintaining higher electrostatic capacity proportion.
Solution Approach 2:
The patent applies the principle of partial action by providing enhanced thickness only where it is most needed (at the end portions vulnerable to water infiltration) rather than uniformly throughout the entire electrode. This partial reinforcement achieves the necessary moisture resistance while minimizing the impact on electrostatic capacity proportion.
3Ease of manufacture
If conductive paste is applied to form the side-surface outer electrode, then the electrode can be formed on the ceramic element assembly, but rheology of the paste causes the center portion to be raised and thick while end portions become thin
Solution Approach 1:
The patent predetermines the thickness requirements for different portions of the side-surface outer electrode before the actual electrode formation process. By establishing these thickness constraints in advance (first thickness for end portions, second thickness for intermediate portion), the patent guides the conductive paste application process to achieve the desired thickness distribution despite rheological effects.
Solution Approach 2:
The patent specifies different thickness requirements for different portions of the electrode to compensate for rheological effects during paste application. The end portions are designed with a first thickness to ensure adequate coverage and prevent water infiltration, while the intermediate portion can have a second thickness. This local differentiation addresses the non-uniform thickness caused by paste rheology.
Data Source
AI summary
In a laminated ceramic electronic component, a side-surface outer electrode includes a first electrode portion including side-surface electrode portions located on first and second side surfaces and wrap-around electrode portions arranged to extend around from the side-surface electrode portions of the first electrode portion to portions of third and fourth side surfaces; and a second electrode portion including side-surface electrode portions located on the third and fourth side surfaces and wrap-around electrode portions arranged to extend around from the side-surface electrode portions of the second electrode portion to portions of the first and second side surfaces. The wrap-around electrode portions of the second electrode portion reach regions covering portions of outermost inner electrodes located at an outermost side portion among inner electrodes, which portions are exposed in the first and second side surfaces.