Multilayer Ceramic Capacitor Structure for Capacitance and Moisture Resistance
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Solution Overview
Problem
Conventional multilayer ceramic capacitors face challenges in achieving both high capacitance and reliability while reducing size, as thinner side margin portions compromise moisture resistance and overall reliability.
Innovation Solution
The design incorporates additional dielectric ceramic layers on the side surfaces with specific thickness and particle density ratios, along with larger dielectric particles in the inner layers, to enhance capacitance and moisture resistance while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the side margin portion is reduced in thickness for the purpose of reducing size, then the size of the multilayer ceramic capacitor is reduced, but the moisture resistance is reduced and the reliability is degraded
Solution Approach 1:
The patent applies different dielectric ceramic layer configurations to different regions of the capacitor. The inner layer portion uses first dielectric ceramic layers with specific particle counts (3-6 particles) for high capacitance, while the outer layer portions use second dielectric ceramic layers with higher particle counts (100-150 particles) for moisture resistance. This local differentiation allows each region to optimize for its specific function.
Solution Approach 2:
The patent uses composite dielectric ceramic structures combining two types of dielectric ceramic layers with different properties. The first dielectric ceramic layers provide high capacitance through larger particle counts, while the second dielectric ceramic layers provide moisture resistance through smaller particle counts and higher density. This composite approach resolves the contradiction between size reduction and moisture resistance.
2Quantity of substance
If the thickness of dielectric ceramic layers is reduced and the number of laminated layers is increased to achieve high capacitance, then the capacitance increases, but the manufacturing complexity and size control become more difficult
Solution Approach 1:
The patent segments the dielectric ceramic layers into two distinct types: first dielectric ceramic layers in the inner layer portion and second dielectric ceramic layers in the outer layer portions. This segmentation allows different particle counts and thicknesses to be optimized for different functional requirements, achieving high capacitance without excessively increasing the total number of layers.
Solution Approach 2:
The patent changes key parameters of the dielectric ceramic layers: the first dielectric ceramic layers have thickness of 0.48-0.52 μm with 3-6 particles, while the second dielectric ceramic layers have thickness of 0.20-0.30 μm with 100-150 particles. By adjusting these parameters, the patent achieves high capacitance through optimized particle distribution rather than simply increasing layer count.
Data Source
AI summary
A multilayer ceramic capacitor includes first dielectric ceramic layers each with a thickness of about 0.48 μm or more and about 0.50 μm or less in the lamination direction, and additional dielectric ceramic layers each with a thickness of about 10 μm or more and about 15 μm or less in the width direction. A number of dielectric particles in each first dielectric ceramic layer in a thickness direction is three or more and six or less. A number of dielectric particles in each additional dielectric ceramic layer in a thickness direction is 100 or more and 150 or less. When the number of dielectric particles in each of first dielectric ceramic layer is NT, and the number of dielectric particles in each additional dielectric ceramic layer is NW, a ratio of NT to NW is about 1:23.08 or more and about 1:46.15 or less.