Multilayer Ceramic Capacitor Electrode Layout Against Moisture Ingress
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increased number of multilayer ceramic capacitors in electronic devices leads to a higher risk of circuit failure due to moisture infiltration, which deteriorates insulation resistance.
Innovation Solution
The multilayer ceramic capacitor design includes internal electrodes with a first region inside the body and thinner second regions extending towards the surfaces, reducing moisture infiltration paths and improving insulation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of multilayer ceramic capacitors is increased to reduce impedance in high frequency circuits, then the impedance characteristics are improved, but the reliability deteriorates due to increased risk of moisture infiltration and circuit failure
Solution Approach 1:
The patent applies local quality by making the second regions of the second internal electrode thinner than the first region, creating a non-uniform thickness distribution. This local variation reduces the moisture infiltration path at the outer periphery where moisture is most likely to enter, while maintaining sufficient electrode thickness in the inner region for electrical functionality, thus improving reliability without compromising impedance characteristics
2Ease of manufacture
If conventional internal electrode structures are used, then manufacturing is simpler, but moisture infiltration paths are longer leading to insulation resistance deterioration
Solution Approach 1:
The patent implements local quality by varying the thickness of the second internal electrode across different regions. The second regions extending toward the outer periphery are made thinner, which shortens the moisture infiltration path at the most vulnerable areas, while the first region in the center maintains sufficient thickness for electrical performance, effectively reducing moisture damage risk
3Manufacturing precision
If uniform thickness internal electrodes are used, then manufacturing precision is easier to maintain, but insulation resistance deteriorates due to longer moisture infiltration paths at the outer periphery
Solution Approach 1:
The patent applies local quality by intentionally creating non-uniform thickness in the second internal electrode. The second regions are designed to be thinner than the first region, which strategically shortens the moisture infiltration path at the outer periphery where insulation resistance is most vulnerable, while maintaining adequate thickness in the inner region for electrical functionality
Data Source
AI summary
A multilayer ceramic capacitor includes a laminate including first and second surfaces facing each other in a lamination direction, third and fourth surfaces facing each other in a first direction, and fifth and sixth surfaces facing each other in a second direction, a first external electrode on the third surface, a second external electrode on the fourth surface, a third external electrode on the fifth surface, and a fourth external electrode on the sixth surface, an internal layer portion and two outer layer portions. The inner layer portion includes an inner layer dielectric layer, a first internal electrode exposed on the third and second surfaces, and a second internal electrode exposed on the fifth and sixth surfaces. The second internal electrode includes first and second regions. In the lamination direction, a thickness of the second region is less than a thickness of the first region.