Multilayer Ceramic Capacitor Groove Segmentation for Acoustic Noise Reduction
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Solution Overview
Problem
Multilayer ceramic capacitors generate significant acoustic noise due to piezoelectric vibrations, which existing methods fail to adequately reduce without increasing the component thickness, posing a challenge for products with thickness limitations.
Innovation Solution
Incorporating a ceramic body with alternately stacked dielectric layers and internal electrodes, along with dummy electrodes and a recessed groove portion, to effectively disperse piezoelectric stress without increasing the component's thickness, thereby reducing acoustic noise transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If frame-shaped metal terminals are attached to both end surfaces of the multilayer ceramic capacitor to decrease acoustic noise, then acoustic noise is reduced, but the thickness of the component increases
Solution Approach 1:
The invention divides the end surface of the ceramic body into multiple regions by forming groove portions that extend in the length direction. This segmentation creates multiple smaller contact areas with the printed circuit board, dispersing the piezoelectric stress and reducing acoustic noise without requiring increased terminal thickness. The groove portions effectively break up the continuous stress transmission path.
Solution Approach 2:
The invention introduces dummy electrodes in specific local regions (width-directional end portions) of the ceramic body, rather than uniformly across the entire structure. These dummy electrodes are positioned to face each other across the groove portions, creating localized stress dispersion zones that target the acoustic noise problem without adding overall thickness.
2Object-affected harmful factors
If the thickness of metal terminals is increased to decrease acoustic noise to a predetermined level, then acoustic noise is reduced, but the thickness of the product having the multilayer ceramic capacitor mounted thereon increases
Solution Approach 1:
The groove portions segment the contact surface between the ceramic body and the printed circuit board, creating multiple discrete contact regions. This segmentation allows the acoustic noise to be reduced through stress dispersion while maintaining the original terminal thickness, thus avoiding an increase in overall product thickness.
Solution Approach 2:
The groove portions act as intermediary structures between the metal terminals and the printed circuit board. They provide a mechanical interface that disperses piezoelectric stress without requiring thicker terminals, serving as a mediator that achieves noise reduction while preserving compact dimensions.
3Object-affected harmful factors
If groove portions are formed in the lower surface of the ceramic body and dummy electrodes are added, then acoustic noise is decreased without increasing thickness, but the device complexity increases
Solution Approach 1:
The groove portions are formed by simply dividing the lower surface into multiple regions, creating a segmented structure that reduces acoustic noise. This segmentation approach achieves the noise reduction goal while maintaining relatively simple manufacturing processes and structural design.
Solution Approach 2:
The dummy electrodes serve multiple functions: they act as electrical connection elements and simultaneously function as stress dispersion elements due to their positioning across the groove portions. This multi-functionality reduces the need for additional specialized components, keeping the overall device complexity manageable.
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 decreases acoustic noise by dispersing piezoelectric stress, ensuring that the multilayer ceramic capacitors can be mounted on printed circuit boards without increasing the component's thickness, thus addressing the noise issue while maintaining product dimensions.
Implementation Method 1
since the dielectric layers have piezoelectric properties, when a direct current (DC) voltage or an alternating current (AC) voltage is applied to the multilayer ceramic capacitor, a piezoelectric phenomenon may be generated between the internal electrodes, such that a volume of a ceramic body is expanded and contracted according to a frequency, thereby generating periodic vibrations
Data Source
AI summary
There is provided a multilayer ceramic capacitor including, a ceramic body having a plurality dielectric layers stacked therein and a groove portion recessed inwardly in a lower surface thereof in a width direction, a plurality of first and second internal electrodes disposed in the ceramic body to be alternately exposed through both end surfaces of the ceramic body, having the dielectric layers therebetween, and first and second external electrodes respectively formed on both end portions of the ceramic body and electrically connected to the first and second internal electrodes, respectively.