Multilayer Ceramic Capacitor Electrode Segmentation
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Solution Overview
Problem
Multilayer ceramic capacitors face a trade-off between reducing direct-current resistance and maintaining mechanical strength as the number of inner electrodes decreases, leading to increased heat generation and reduced capacitance.
Innovation Solution
A multilayer ceramic capacitor design with a specific arrangement of inner and outer electrodes, including a capacitance generating portion and successive stacking portions, where the total thickness of inner electrodes and their opposition ratio are optimized to maintain mechanical strength while reducing direct-current resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of inner electrodes is decreased to reduce capacitance, then the capacitance is reduced, but the direct-current resistance increases and mechanical strength decreases
Solution Approach 1:
The patent extends inner electrodes in multiple directions (length direction and width direction) rather than only stacking them in the thickness direction. This dimensional expansion allows the electrodes to form a more extensive conductive network throughout the ceramic body, reducing direct-current resistance even when the total number of electrode stacks is reduced for lower capacitance.
Solution Approach 2:
The patent divides the electrode structure into multiple segments that extend in different directions (first inner electrodes extending in length direction, second inner electrodes extending in width direction). This segmentation creates multiple parallel conduction paths, reducing overall resistance while allowing flexible control of capacitance through selective stacking.
2Quantity of substance
If the number of inner electrodes is decreased to reduce capacitance, then the capacitance is reduced, but the mechanical strength decreases
Solution Approach 1:
The patent creates regions with different electrode densities - the center region contains the stacked inner electrodes for capacitance generation, while the outer regions contain extended electrode portions that provide mechanical reinforcement. This local differentiation allows reduced overall electrode count for lower capacitance while maintaining mechanical strength through strategically placed conductive structures.
3Quantity of substance
If the direct-current resistance increases, then the capacitance is reduced, but the heat generation increases
Solution Approach 1:
By extending electrodes in length and width directions in addition to stacking in thickness direction, the patent creates a three-dimensional conductive network that reduces direct-current resistance. This multi-dimensional electrode arrangement provides multiple parallel current paths, reducing resistive heating even when the capacitor is designed with fewer electrode stacks for lower capacitance.
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 design effectively reduces direct-current resistance and maintains mechanical strength even with reduced capacitance, ensuring the capacitor's performance and reliability.
Implementation Method 1
a capacitance generating portion in which a first inner electrode among the first inner electrodes and a second inner electrode among the second inner electrodes oppose each other to generate an electrostatic capacitance
Implementation Method 2
the direct-current resistance (Rdc) of the inner electrodes increases
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body including dielectric layers and inner electrodes stacked in an alternating manner, and first, second, third, and fourth outer electrodes provided on a surface of the multilayer body. An effective portion includes a capacitance generating portion in which first and second inner electrodes face each other to generate an electrostatic capacitance, a first successive stacking portion in which first inner electrodes are successively stacked, and a second successive stacking portion in which second inner electrodes are successively stacked. The following relational expressions (1) and (2) are satisfied. (1) about 0.168≤Total thickness of inner electrodes/Dimension of multilayer body in stacking direction. (2) about 0.19≤Total number of first and second inner electrodes opposing each other with dielectric layers interposed therebetween/Total number of inner electrodes≤about 0.48.