Curved Electrode Multilayer Capacitor for Delamination Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayer capacitors face challenges in inhibiting structural and mounting defects as they are thinned and multi-layered, leading to potential delamination and capacity reduction.
Innovation Solution
The design includes a multilayer capacitor with specifically curved electrodes and defined geometric relationships to enhance interlayer adhesion and prevent deformation during manufacturing, ensuring increased capacity and flattened surfaces for improved mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the multilayer capacitor is thinned and multi-layered to increase capacity, then the capacity is improved, but structural defects such as delamination are likely to occur
Solution Approach 1:
The internal electrodes are designed with curved surfaces instead of flat surfaces. Specifically, the electrodes have a curvature radius R that satisfies 0.03mm ≤ R ≤ 0.15mm, which allows the electrodes to flexibly accommodate stress during stacking and sintering processes. This curvature design prevents delamination and other structural defects while maintaining high capacity in thinned multi-layer configurations.
2Quantity of substance
If the multilayer capacitor is thinned and multi-layered to increase capacity, then the capacity is improved, but mounting defects are likely to occur
Solution Approach 1:
The curved surface design of internal electrodes with controlled curvature radius improves the flexibility and stress distribution during mounting processes. This curvature allows the thin multi-layer structure to better accommodate thermal expansion and mechanical stress during mounting, reducing mounting defects while maintaining high capacity.
3Reliability
If the internal electrodes are curved to increase interlayer adhesion strength, then structural defects are inhibited, but the capacitance forming portion may deform during pressurizing step
Solution Approach 1:
The curvature radius R of the internal electrodes is precisely controlled within the range of 0.03mm ≤ R ≤ 0.15mm. This parameter optimization ensures that the electrodes have sufficient curvature to improve interlayer adhesion and prevent delamination, while not being so curved as to cause deformation of the capacitance forming portion during the pressurizing step. The specific radius range balances adhesion improvement with dimensional stability.
Data Source
AI summary
An element body of a multilayer capacitor has a plurality of first electrodes and a plurality of second electrodes. At least one of the first electrodes is curved such that a first main body portion is located on an outer side of a first extending portion in a first direction, and at least one of the second electrodes is curved such that a second main body portion is located on an outer side of a second extending portion in the first direction. The following expressions (1) to (6) are satisfied for lengths L0 to L4 in a second direction and distances TL1 to TL3 between main surfaces.0.03≤L1/L0≤0.1 (1)0.1≤L2/L0≤0.25 (2)0.75≤L3/L0≤0.9 (3)0.9≤L4/L0≤0.97 (4)0≤(TL1−TL2)/TL1≤0.02 (5)0≤(TL1−TL3)/TL1≤0.02 (6)