Multilayer Ceramic Capacitor Discontinuous Electrode Resin Stress Relief
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Solution Overview
Problem
Multilayer ceramic electronic components face challenges in improving mechanical strength between the ceramic main body and external electrodes, with existing methods either increasing external electrode thickness, reducing capacitance, or degrading moisture resistance.
Innovation Solution
A multilayer ceramic capacitor design featuring a ceramic main body with laminated dielectric and internal electrodes, where the underlayer external electrode is discontinuously provided on the ceramic main body, and the exposed regions are covered with a resin layer and a plating film, enhancing mechanical strength and moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conductive resin layer is additionally formed between underlayer external electrode and plating film to improve mechanical strength, then the stress can be released and mechanical strength is improved, but the thickness of external electrode increases which reduces capacitance
Solution Approach 1:
The patent introduces a resin layer as an intermediary substance between the underlayer external electrode and the plating film. This resin layer acts as a stress-absorbing medium that releases mechanical stress during thermal cycles and external force applications, thereby improving the mechanical strength and reliability of the external electrode connection without increasing the overall external dimension of the component.
Solution Approach 2:
The patent changes the thickness parameter of the underlayer external electrode to be thinner than conventional designs. By reducing the thickness of this layer, the overall external dimension is reduced, which allows for increased capacitance while still maintaining adequate mechanical strength through the resin layer intermediary and optimized electrode pattern design.
2Strength
If underlayer external electrode is discontinuously formed to relieve residual stress and improve mechanical strength, then stress is relieved, but internal electrode is exposed and moisture resistance is degraded
Solution Approach 1:
The resin layer serves as a protective intermediary that covers the exposed internal electrode in the discontinuous portions of the underlayer external electrode. This resin coating prevents moisture from penetrating into the internal electrode and ceramic interface, thereby maintaining moisture resistance and reliability while still allowing the discontinuous electrode structure to relieve residual stress.
Solution Approach 2:
The patent employs a composite structure combining the discontinuous underlayer external electrode (metallic material) with the resin layer (polymer material) covering the exposed regions. This composite approach leverages the stress-relief properties of the discontinuous metal structure while utilizing the moisture-barrier properties of the resin material to protect exposed areas.
Data Source
AI summary
A ceramic electronic component includes a ceramic main body in which dielectric layers and internal electrodes are laminated, the ceramic main body including a pair of principal surfaces, a pair of side surfaces, and a pair of end surfaces, the internal electrodes are exposed to the end surfaces, and an underlayer external electrode covers at least a portion of the end surface. When a section of the ceramic main body is viewed, the underlayer external electrode is discontinuously provided on the ceramic main body. The ceramic main body includes an exposed region partially exposed from the discontinuously provided underlayer external electrode, the exposed region is covered with a resin layer, and the underlayer external electrode is covered with a plating film.