MLCC Rounded Cover Structure for Mounting Reliability
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in maintaining mounting reliability and preventing body breakage, which can lead to reduced moisture reliability and insulation resistance, especially in miniaturized and high-capacitance applications.
Innovation Solution
The multilayer electronic component design features rounded corners with varying radii of curvature and dielectric crystal grain sizes in cover portions, ensuring Rd<Ru and Gs2<Gs1, to enhance mounting strength and reduce breakage risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the multilayer electronic component is miniaturized to achieve high capacitance and small size, then the capacitance density increases, but the mounting reliability deteriorates and body breakage risk increases
Solution Approach 1:
The patent applies different radius of curvature values to different corners of the external electrode (R1, R2, R3, R4) based on their specific positions and functional requirements. The first and second corners have different curvature radii from the third and fourth corners, allowing each corner to be optimized for its local mounting conditions while maintaining overall component miniaturization.
Solution Approach 2:
The patent changes the geometric parameter of corner curvature by introducing non-zero radius of curvature values at the corners of the external electrode. This parameter modification (from sharp corners to rounded corners with specific radii) enhances mounting reliability and reduces breakage risk while preserving the miniaturized form factor and high capacitance density.
2Strength
If the corner radius of curvature is increased to improve mounting reliability, then the mounting strength increases, but the body breakage resistance may be affected
Solution Approach 1:
The patent assigns different radius of curvature values to different corners (R1≠R2, R3≠R4) based on their specific positions and mounting requirements. This local differentiation allows each corner to be optimized independently - some corners can have larger radii for mounting strength while others have smaller radii to maintain structural integrity and prevent body breakage.
Solution Approach 2:
The patent introduces asymmetric corner design where the four corners of the external electrode have different curvature radii. This asymmetric configuration allows the component to have enhanced mounting strength at critical corners while maintaining appropriate structural rigidity at other corners, thereby preventing body breakage.
Data Source
AI summary
According to an example embodiment of the present disclosure, a multilayer electronic component may have a body in which corners thereof have a rounded shape, a radius of curvature of a corner disposed in an upper cover portion may be larger than a radius of curvature of a corner disposed in a lower cover portion, and an average size of dielectric crystal grains included in an upper cover portion may be larger than an average size of dielectric crystal grains included in a lower cover portion.