Multilayer Ceramic Capacitor With Extended Electrodes
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Solution Overview
Problem
The reduction in size and thickness of electronic devices poses a challenge in ensuring the sufficiency of multilayer ceramic capacitors' strength, particularly due to the deterioration of deflective strength as they become thinner.
Innovation Solution
A multilayer ceramic capacitor design featuring a laminate structure with specific dimensions and electrode configurations, including extended internal electrodes and external electrodes, which ensures deflective strength by optimizing the ratio of dimensions and electrode placement to reduce equivalent series inductance and prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of multilayer ceramic capacitors is reduced to meet miniaturization requirements, then the size and thickness of electronic devices can be reduced, but the deflective strength of the capacitors deteriorates
Solution Approach 1:
The patent extends internal electrodes from the traditional two-dimensional configuration (only between main surfaces) to three-dimensional configuration by extending them to side surfaces. This dimensional expansion creates additional bonding areas and structural support, improving deflective strength without increasing the thickness between main surfaces. The internal electrodes now have extended portions that reach the side surfaces, forming a more robust three-dimensional electrode structure that enhances mechanical strength while maintaining thin profile.
Solution Approach 2:
The patent employs composite material structures by combining multiple electrode materials and configurations. The internal electrodes consist of alternating first and second internal electrodes with different extensions, creating a composite structure that optimizes both electrical performance and mechanical strength. The external electrodes are also configured as composites with specific extensions to main and side surfaces, forming a multi-material system that simultaneously achieves thinness and high deflective strength.
2Volume of moving object
If the thickness of multilayer ceramic capacitors is reduced, then miniaturization is achieved, but it becomes difficult to ensure sufficient strength
Solution Approach 1:
The patent addresses reliability concerns by transitioning from a two-dimensional electrode layout to a three-dimensional configuration. Internal electrodes extend not only between main surfaces but also to side surfaces, creating a立体 (three-dimensional) structure that provides additional mechanical support and bonding pathways. This dimensional enhancement ensures sufficient strength and reliability even when the capacitor thickness is reduced to meet miniaturization requirements.
Solution Approach 2:
The patent segments the electrode structure into multiple functional portions: internal electrodes are divided into main portions between main surfaces and extended portions reaching side surfaces. External electrodes are similarly segmented with extensions to both main and side surfaces. This segmentation creates multiple independent bonding areas, ensuring that if one bonding region is compromised, other regions maintain structural integrity and electrical connectivity, thereby ensuring sufficient reliability.
3Strength
If internal electrodes are extended to side surfaces, then deflective strength is improved, but device complexity increases
Solution Approach 1:
The patent manages complexity by clearly segmenting the electrode structure into standardized components: internal electrodes with extended portions and external electrodes with corresponding extensions. Each segment has a defined function and configuration, making the overall complex structure manageable through modular design. The segmentation allows for systematic manufacturing processes where each portion can be formed and positioned independently, reducing the practical complexity despite the enhanced three-dimensional configuration.
Data Source
AI summary
A multilayer ceramic capacitor includes a laminate including dielectric layers and internal electrodes that are laminated, and external electrodes disposed on side surfaces of the laminate to be connected to corresponding internal electrodes. A dimension L of the multilayer ceramic capacitor in its lengthwise direction and a dimension W in its width direction satisfy: about 0.85≤W/L≤about 1, and L≤about 750 μm, and a dimension T in its lamination direction satisfies: about 70 μm≤T≤about 110 μm. The laminate has a dimension t in the lamination direction, and a region in which the internal electrodes are laminated has a dimension t′ in the lamination direction, and a ratio of the dimensions satisfies: t′/t≥about 0.55.