Multilayer Ceramic Capacitor Asymmetric Electrodes Reduce Acoustic Noise
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Solution Overview
Problem
Multilayer ceramic electronic components with high capacitance generate acoustic noise due to piezoelectric phenomena when voltage is applied, causing vibrations that are transferred to printed circuit boards, making them uncomfortable for users.
Innovation Solution
Designing a multilayer ceramic electronic component with a ceramic body having dielectric layers and internal electrodes where the average width of the electrodes at the upper portion is greater than at the lower portion, with specific ratios and configurations to minimize acoustic noise while maintaining high capacitance, including acoustic noise decreasing parts and controlling electrode widths and distances to reduce deformation and noise transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of stacked layers is increased to achieve high capacitance, then capacitance is improved, but acoustic noise increases due to piezoelectric vibrations
Solution Approach 1:
The internal electrodes are designed with asymmetric width distribution along the thickness direction, where the average width at the upper portion (M1) is greater than at the lower portion (M2). This asymmetric configuration creates a gradient structure that reduces piezoelectric vibrations and acoustic noise while maintaining high capacitance through increased layer stacking
Solution Approach 2:
Different portions of the internal electrodes have different widths to optimize local properties. The upper portion has wider electrodes for higher capacitance, while the lower portion has narrower electrodes to reduce vibration and noise transfer to the substrate
2Volume of moving object
If the thickness of dielectric layers is reduced to enable miniaturization, then component size is decreased, but the number of stacked layers must be increased which leads to increased acoustic noise
Solution Approach 1:
The asymmetric electrode width design compensates for the increased layer count by creating a vibration-reducing gradient structure. This allows miniaturization through thin layers and increased stacking while mitigating the acoustic noise that would normally result from such configuration
Solution Approach 2:
The solution addresses the noise problem by introducing a dimensional variation in electrode width along the thickness direction, transforming the uniform structure into a gradient structure that reduces vibrations without increasing component footprint
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 solution effectively reduces acoustic noise by more than 20 dB while maintaining a capacitance decrease rate of less than 8%, ensuring both high capacitance and reduced noise levels in multilayer ceramic capacitors.
Implementation Method 1
since the dielectric layers have piezoelectric and electrostrictive characteristics, a piezoelectric phenomenon is generated between the internal electrodes when direct current (DC) or alternating current (AC) voltage is applied to a multilayer ceramic capacitor, such that vibrations may be generated
Implementation Method 2
since the dielectric layers have piezoelectric and electrostrictive characteristics, a piezoelectric phenomenon is generated between the internal electrodes when direct current (DC) or alternating current (AC) voltage is applied to a multilayer ceramic capacitor
Data Source
AI summary
There is provided a multilayer ceramic electronic component including: a ceramic body including dielectric layers and satisfying T/W>1.0 when a width thereof is W and a thickness thereof is T; and first and second internal electrodes stacked to face each other, having the dielectric layer interposed therebetween, within the ceramic body, wherein when an average width of the first and second internal electrodes stacked at an upper portion of the ceramic body in a thickness direction is M1 and an average width of the first and second internal electrodes stacked at a lower portion of the ceramic body in the thickness direction is M2, M1>M2 is satisfied.