Multilayer Ceramic Capacitor Deflection Strength via Layer Thickness
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Solution Overview
Problem
Multilayer ceramic capacitors require enhanced deflection strength to withstand mounting and thermal shock stresses, but existing solutions complicate the structure with dummy or non-capacitance-forming metal layers.
Innovation Solution
A multilayer ceramic capacitor design featuring a laminated structure with protective and capacitance-forming ceramic parts, including a non-capacitance-forming part, where the thickness relationship of protective parts (T2) is less than capacitance-forming parts (T3) and non-capacitance-forming parts (T4) satisfies T2 < T3 ≤ T4, eliminating the need for non-contributory metal or dummy electrode layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If dummy electrode layers or metal layers are added to improve deflection strength, then deflection strength is improved, but device complexity increases
Solution Approach 1:
The patent merges the protective function and the mechanical reinforcement function into a single integrated structure. The non-capacitance-forming ceramic part serves both as a protective element and as a structural component that enhances deflection strength, eliminating the need for separate dummy electrode layers or metal layers.
Solution Approach 2:
The non-capacitance-forming ceramic part performs multiple functions: it provides mechanical protection to the capacitor body and simultaneously acts as a reinforcement layer to improve deflection strength. This multi-functional design avoids adding extra layers that would increase structural complexity.
2Strength
If the thickness of protective parts is increased to improve mechanical resilience, then deflection strength is improved, but the overall capacitor size increases
Solution Approach 1:
The patent applies local quality by positioning the non-capacitance-forming ceramic part specifically between the capacitance-forming parts, where it is most needed for mechanical reinforcement. This targeted placement provides enhanced deflection strength without uniformly increasing the thickness of the entire capacitor body.
Solution Approach 2:
The patent optimizes the thickness relationship between different layers (T2, T3, T4) to achieve the required mechanical strength. By carefully controlling the relative dimensions of protective parts versus capacitance-forming parts, the design achieves adequate deflection strength while minimizing overall capacitor size.
Data Source
AI summary
In an embodiment, a capacitor body 11 of the multilayer ceramic capacitor 10 has protective parts 11a made of ceramics, capacitance-forming parts 11b comprising multiple internal electrode layers 11b1 stacked together with ceramic layers 11b2 placed in between, and a non-capacitance-forming part 11c made of ceramics, in the order of “protective part 11a—capacitance-forming part 11b—non-capacitance-forming part 11c—capacitance-forming part 11b—protective part 11a” from one side to the other side along the laminating direction, and T2 representing the thickness of each protective part 11a in the laminating direction, T3 representing the thickness of each capacitance-forming part 11b in the laminating direction, and T4 representing the thickness of the non-capacitance-forming part 11c in the laminating direction, satisfy the relationship of “T2<T3≤T4.”