Multilayer Ceramic Capacitor Metal Segregation Electric Field
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Solution Overview
Problem
Existing multilayer ceramic capacitors face reliability issues due to electric field concentration at the ends of internal electrodes, which is not effectively addressed by current manufacturing methods, particularly in the composition of dielectric laminated sheets and ceramic pastes used for level difference elimination.
Innovation Solution
The multilayer ceramic capacitor design incorporates a specific arrangement of dielectric ceramic layers and internal electrode layers with segregation of metal elements like Mg, Mn, and Si at the ends and corners, along with a unique composition for the dielectric ceramic layers to reduce electric field concentration, enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the side margin is reduced to increase the area of internal electrode layers, then the capacitance increases, but the electric field concentration at the ends of internal electrodes worsens
Solution Approach 1:
The patent applies local quality by introducing metal element segregations (Mg, Mn, Si) at specific locations - the ends and corners of internal electrode layers - rather than uniformly distributing materials throughout the structure. This localized modification addresses the electric field concentration problem only where it occurs most severely, without affecting the overall capacitance-enhancing design of reduced side margins.
Solution Approach 2:
The patent changes the chemical composition parameters of the dielectric ceramic layer by incorporating specific metal elements (Mg, Mn, Si) at controlled concentrations at the ends and corners of internal electrode layers. This parameter modification alters the electrical properties locally to reduce electric field concentration while maintaining the overall structure optimized for high capacitance.
2Ease of manufacture
If conventional dielectric laminated sheets and ceramic pastes are used for level difference elimination, then the manufacturing process is simple, but the reliability is degraded due to electric field concentration
Solution Approach 1:
The invention modifies the dielectric ceramic layer composition locally at the ends and corners of internal electrode layers by incorporating metal element segregations. This targeted compositional change addresses electric field concentration without requiring fundamental changes to the manufacturing process, maintaining ease of production while improving reliability.
Solution Approach 2:
The patent creates a composite dielectric ceramic layer that combines conventional dielectric materials with specific metal elements (Mg, Mn, Si) at controlled concentrations. This composite structure provides both the level difference elimination function and the electric field concentration reduction, maintaining manufacturing simplicity while enhancing reliability.
Data Source
AI summary
A multilayer ceramic capacitor includes a third segregation by each of metal elements of a first segregation and a second segregation is provided at each of a first corner region in which an end in a length direction in which the first segregation is provided overlaps an end in a width direction in which the second segregation is provided in a first internal electrode layer, and a second corner region in which an end in the length direction in which the second segregation is provided overlaps an end in the width direction in which the second segregation is provided in a second internal electrode layer.