Multilayer Ceramic Capacitor Phosphor Marker for Electrode Orientation
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Solution Overview
Problem
Multilayer ceramic electronic components with internal electrodes embedded in laminated ceramic bodies pose challenges in determining the orientation of internal electrodes, affecting electrical characteristics and mounting stability due to covered electrode configurations and similar shapes of laminated bodies.
Innovation Solution
Incorporating a phosphor on the outer surface of the laminated body, which emits luminescence under ultraviolet irradiation, allowing for image determination and alignment of internal electrode orientations, thereby facilitating accurate mounting and reducing electrical variability and acoustic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal electrodes are covered with ceramic layers and external electrodes, then the component structure is protected and manufacturing is simplified, but the orientation of internal electrodes cannot be confirmed
Solution Approach 1:
A marker portion is introduced as an intermediary element on the outer surface of the laminated body to indicate the orientation of internal electrodes. This marker serves as a mediator that allows external observation of internal electrode orientation without exposing the electrodes themselves, thus maintaining structural protection while enabling orientation detection.
Solution Approach 2:
The marker portion utilizes visual differentiation (color or pattern changes) to indicate the orientation of internal electrodes. By applying different markers to different surfaces of the laminated body, the orientation information becomes visually detectable without compromising the protective ceramic structure.
2Ease of manufacture
If laminated bodies have similar square shapes on all sides, then manufacturing consistency is improved, but the disposed orientation of internal electrodes cannot be determined from external shapes
Solution Approach 1:
While the laminated body maintains a symmetric square shape for manufacturing consistency, asymmetric marker portions are applied to specific surfaces to break the visual symmetry. This allows the external shape to remain consistent for manufacturing while the markers provide asymmetric orientation information that enables determination of internal electrode disposition.
3Manufacturing precision
If packing is used to align internal electrodes during mounting, then mounting precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The marker portion serves as an intermediary reference that eliminates the need for complex packing structures. By providing clear visual orientation cues on the component surface, the marker allows for simple alignment during mounting without requiring specialized packing equipment or complex alignment mechanisms.
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
Enables easy determination of internal electrode orientations, ensuring stable electrical characteristics and reduced acoustic noise by aligning electrodes appropriately during mounting, and determining magnetic flux direction in inductors to minimize magnetic field interference.
Implementation Method 1
a phosphor is disposed on a portion of an outer surface of the laminated body that does not include the external electrode
Implementation Method 2
the phosphor produces luminescence when the phosphor is irradiated with ultraviolet rays or the like
Data Source
AI summary
A multilayer ceramic capacitor includes a laminated body including laminated ceramic layers, and first and second internal electrodes extending along interfaces between the ceramic layers. External electrodes are located on outer surfaces of the laminated body. Phosphor is disposed on portions of outer surfaces of the laminated body containing no external electrodes.