Multilayer Ceramic Capacitor Structure for Moisture Resistance
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in maintaining moisture resistance due to the thinning of dielectric layers surrounding internal electrode layers as they are miniaturized and increased in capacitance, leading to potential reliability issues.
Innovation Solution
The design incorporates a higher Mn content in outer dielectric layers and side margin portions to enhance moisture resistance, with a configuration that includes a multilayer body with alternating dielectric and internal electrode layers, and external electrodes that wrap around the end surfaces, improving the dielectric's density and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the outer shape of the multilayer ceramic capacitor is reduced and the area ratio of the internal electrode layer is increased, then the capacitance is increased and miniaturization is achieved, but the dielectric layer surrounding the internal electrode layers becomes thin and moisture resistance deteriorates
Solution Approach 1:
The patent applies local quality by creating side margin portions with higher Mn content specifically in regions where moisture resistance is critical (outer dielectric layers and side margin portions), while maintaining other dielectric properties throughout the structure. This localized compositional adjustment enhances moisture resistance without compromising the overall miniaturization and capacitance design.
Solution Approach 2:
The patent changes the chemical composition parameter of the dielectric layer by increasing Mn content in specific regions (side margin portions and outer dielectric layers). This parameter change densifies the dielectric structure and improves moisture resistance, allowing the capacitor to maintain reliability despite reduced overall size and thinner dielectric regions.
2Volume of moving object
If the dielectric layer thickness is reduced to achieve miniaturization, then the device size is decreased, but the moisture resistance of the dielectric deteriorates
Solution Approach 1:
The patent implements local quality by differentiating the Mn content across different regions of the dielectric structure. Side margin portions and outer dielectric layers have higher Mn content specifically targeted at moisture barrier functions, while inner dielectric layers maintain standard composition. This regional differentiation allows thin dielectric layers to achieve adequate moisture resistance through localized material optimization.
Solution Approach 2:
The patent effectively creates a composite dielectric structure with two distinct compositional regions: inner dielectric layers with standard composition and outer dielectric layers/side margin portions with enhanced Mn content. This composite approach allows the overall device to be miniaturized while the high-Mn regions provide specialized moisture protection where most needed.
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
This configuration effectively increases the moisture resistance of multilayer ceramic capacitors by densifying the dielectric layers and reducing the risk of moisture ingress, thereby enhancing the reliability and performance of the capacitors.
Implementation Method 1
a higher Mn content in outer dielectric layers and side margin portions to enhance moisture resistance, with a configuration that includes a multilayer body with alternating dielectric and internal electrode layers
Implementation Method 2
improve the moisture resistance of the dielectric in this portion to ensure the moisture resistance of the multilayer ceramic capacitor
Data Source
AI summary
Dielectric layers include outer dielectric layers and inner dielectric layers. The outer dielectric layers are located between a first principal surface and an internal electrode layer located closest to the first principal surface in a thickness direction and between a second principal surface and an internal electrode layer located closest to the second principal surface in the thickness direction. The inner dielectric layers are located between internal electrode layers adjacent to each other in the thickness direction. In an element body portion, side margin portions, which are located in a width direction between a first side surface and a plurality of internal electrode layers and between a second side surface and a plurality of internal electrode layers, have a higher Mn content than the inner dielectric layers.