Multilayer Ceramic Capacitor Outer Layers for Surface Differentiation
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Solution Overview
Problem
Conventional multilayer ceramic capacitors face difficulties in distinguishing between main and side surfaces during transport and mounting, leading to inefficiencies in appearance-based screening and have insufficient high-temperature reliability.
Innovation Solution
The multilayer ceramic capacitor design includes distinct color tones between main-surface-side and side-surface-side outer layer portions, achieved by incorporating a monotectoid phase of Ca and Si in specific areas, with controlled RGB value differences and area percentages, along with a structured electrode configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the multilayer ceramic capacitor has a conventional parallelepiped shape with uniform outer layers, then the manufacturing process is simple, but it is difficult to distinguish between main surfaces and side surfaces during transport and mounting
Solution Approach 1:
The patent applies local quality by creating outer layer portions with different compositions and colors at specific locations. The side surface outer layer portions contain a monotectoid phase (Ca-Si system) that generates distinct coloration, while main surface outer layer portions have different composition. This local compositional differentiation enables visual distinction between surfaces without complicating the overall device structure.
Solution Approach 2:
The patent utilizes color changes as the primary mechanism for surface differentiation. By controlling the formation of the monotectoid phase in side surface outer layer portions, distinct color tones are generated that allow easy visual identification of side surfaces versus main surfaces during transport and mounting operations.
2Ease of operation
If the monotectoid phase region is enlarged to improve color differentiation, then surface distinguishability improves, but high-temperature reliability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the size parameter of the monotectoid phase region. The region where the monotectoid phase is present is limited to not larger than about 3% of the total area of the side surface outer layer portions in the width-direction cross-section. This quantitative parameter control achieves optimal balance between color differentiation effectiveness and high-temperature reliability maintenance.
Solution Approach 2:
The patent confines the monotectoid phase to specific local regions (side surface outer layer portions) rather than distributing it throughout the entire structure. This localized approach provides sufficient color differentiation at the boundaries where it is most needed, while avoiding adverse effects on the overall device reliability by limiting the total volume of the monotectoid phase.
3Productivity
If the RGB value difference between outer layer portions is increased to improve distinguishability, then surface identification efficiency improves, but the structural integrity may be compromised
Solution Approach 1:
The patent optimizes the RGB value difference parameter within a specific range (not smaller than about 45 and not larger than about 100). This quantitative parameter control ensures sufficient color contrast for efficient visual screening and identification, while preventing excessive compositional differences that could compromise structural integrity. The RGB difference serves as a measurable parameter that balances visual distinguishability with mechanical strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates clear surface differentiation and enhances high-temperature reliability by improving distinguishability and mountability, while controlling adverse effects on structural integrity and reliability.
Implementation Method 1
A monotectoid phase is provided in the first side-surface-side outer layer portion and the second side-surface-side outer layer portion in a WT cross-section defined by the stacking direction and the width direction of the multilayer body. The monotectoid phase includes at least one of Ca and Si.
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body including dielectric layers. A difference between an RGB value which reproduces a color tone of ends in a width direction y of a first and second main-surface-side outer layer portions of the multilayer body and an RGB value which reproduces a color tone of ends in the width direction of a first and second side-surface-side outer layer portions is not smaller than about 45 and not larger than about 100, a monotectoid phase is provided in the first and second side-surface-side outer layer portions in a WT cross-section, includes at least one of Ca and Si, and a region where the monotectoid phase is provided is not larger than about 3% of a total area of the first and second side-surface-side outer layer portions in the WT cross-section of the multilayer body.