Multilayer Ceramic Capacitor Color-Coded Outer Layers
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Solution Overview
Problem
Multilayer ceramic capacitors with square or rectangular cross-sections make it difficult to determine the laminating direction of internal electrodes, leading to variations in capacitance values and mounting challenges due to the buried nature of the electrodes.
Innovation Solution
A multilayer ceramic capacitor design featuring a laminated body with an inner layer of perovskite-type ceramic dielectric layers and outer layers of different oxides, where the boundary reaction layer contains elements not present in the adjacent oxide layers, allowing for color differentiation to determine the laminating direction and improve mounting orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the internal electrodes are buried in the laminated body with square or rectangular cross section, then the capacitor structure is compact and manufacturing is simplified, but it becomes difficult to recognize the laminating direction of the internal electrodes by appearance
Solution Approach 1:
The patent applies color changes by forming an outer layer with a different color from the inner layer portion. This allows the laminating direction of the internal electrodes to be visually recognized through the color difference, resolving the contradiction between compact structure and detectability of electrode orientation.
Solution Approach 2:
The patent creates asymmetry by making the outer layer have a different color than the inner layer portion. This asymmetric color distribution provides visual information about the laminating direction, enabling easy identification of the internal electrode orientation without complicating the overall capacitor structure.
2Adaptability or versatility
If the multilayer ceramic capacitor is mounted without predetermined electrode orientation, then mounting flexibility is improved, but variations in floating capacitance value and characteristics increase
Solution Approach 1:
The patent applies preliminary action by pre-indicating the correct mounting orientation through the color-coded outer layer design. This allows the capacitor to be mounted with the correct orientation before installation, ensuring uniform characteristics while maintaining mounting flexibility through clear visual guidance.
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
The color differentiation at the surface of the multilayer ceramic capacitor enables reliable determination of the internal electrode orientation, facilitating consistent mounting and reducing variations in characteristics, thereby improving the capacitors' performance and usability.
Implementation Method 1
the boundary reaction layer contains at least one element other than oxygen among elements constituting the oxide in the first outer layer adjacent to the boundary reaction layer, and at least one element other than oxygen among elements constituting the oxide in the second outer layer adjacent to the boundary reaction layer
Data Source
AI summary
A multilayer ceramic capacitor includes a laminated body including an inner layer portion including ceramic dielectric layers and internal electrodes, and outer layer portions including ceramic dielectric layers. External electrodes connected to the internal electrodes are provided on both ends of the laminated body. The main constituent of the inner layer portion is a perovskite-type compound represented by ABO3. The outer layer portions include first outer layers and second outer layers respectively containing oxides that differ from each other in main constituents, and boundary reaction layers are provided between the first outer layers and the second outer layers. First ceramic dielectric layers outside the boundary reaction layers differ in color from second ceramic dielectric layers inside the boundary reaction layers.