Multilayer Ceramic Capacitor Aspect Ratio for Self-Alignment
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving higher capacitance while maintaining a compact form factor, as reducing internal electrode thickness is physically limited and stacking multiple capacitors increases cost and height, making self-alignment during mounting difficult when the capacitor is taller than it is wide.
Innovation Solution
A multilayer ceramic capacitor design with a rectangular solid shape, where the width and height meet the condition of 1.10≤H/W≤1.70, featuring staggered internal electrode layers and uniform ceramic layers, allowing for increased capacitance without excessive height and improved self-alignment on circuit boards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the internal electrode layers are made thinner to increase the number of layers, then the capacitance is increased, but the thickness reduction is physically limited
Solution Approach 1:
The patent transitions from increasing capacitance by reducing electrode thickness (one dimension) to increasing capacitance by adding more layers in the vertical direction (another dimension). By making the capacitor body taller than it is wide (H>W), the design exploits the height dimension to stack more internal electrode layers, thereby increasing capacitance without requiring further thickness reduction of individual electrodes.
2Quantity of substance
If multiple multilayer ceramic capacitors are integrally stacked, then the capacitance is increased, but the unit price increases substantially
Solution Approach 1:
The patent merges multiple capacitor functions into a single integrated capacitor body by stacking multiple internal electrode layers within one component. This consolidation achieves the capacitance of multiple separate capacitors while reducing the total number of components, assembly steps, and associated costs, thereby improving ease of manufacture and reducing unit price.
3Quantity of substance
If the multilayer ceramic capacitor is made higher than it is wide to increase the number of internal electrode layers, then the capacitance is increased, but the self-alignment effect becomes difficult to achieve
Solution Approach 1:
The patent optimizes the dimensional parameters of the capacitor body, specifically establishing that the height H should be greater than the width W (H>W) while maintaining specific aspect ratios. This parameter optimization enables increased capacitance through additional layers while preserving adequate self-alignment characteristics during mounting by ensuring the capacitor maintains favorable geometric proportions for automatic placement processes.
Data Source
AI summary
A multilayer ceramic capacitor has a capacitor body of laminate structure and a pair of external electrodes, and shaped roughly as a rectangular solid defined by length L, width W, and height H. This multilayer ceramic capacitor is such that the width W and height H meet the condition of “1.10≤H/W≤1.70.”