Composite Ceramic Capacitor Vibration Damping Design
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Solution Overview
Problem
Current solutions for reducing acoustic noise in electronic devices, particularly those using multilayer ceramic capacitors, have not adequately addressed the impact of capacitor size and ceramic chip thickness on noise reduction, leading to insufficient noise mitigation.
Innovation Solution
A composite electronic component is developed, comprising a multilayer ceramic capacitor with a ceramic chip made of alumina (Al2O3) on its lower portion, where the thickness of the ceramic chip is at least 0.5 mm and the length of the capacitor is 2.0 mm or more, ensuring a T/L ratio of 0.22 or greater, to effectively block vibrations and reduce acoustic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multilayer ceramic capacitor is used in high voltage environments for miniaturization, then device functionality is improved, but acoustic noise increases
Solution Approach 1:
A damping material is introduced as an intermediary layer between the multilayer ceramic capacitor and the circuit board. This mediator absorbs vibrations generated by the capacitor during high voltage operation, preventing sound transmission to the board while maintaining the capacitor's electrical functionality in miniaturized devices.
Solution Approach 2:
The vibration energy generated by the piezoelectric effect in the ceramic capacitor is converted into beneficial damping through the intermediate material. The harmful vibrations are transformed into heat energy absorbed by the damping layer, converting a harmful byproduct into a controlled energy dissipation mechanism.
2Object-generated harmful factors
If a ceramic chip is added below the multilayer ceramic capacitor to reduce vibrations, then acoustic noise is decreased, but device complexity increases
Solution Approach 1:
A thin film damping material is used instead of a thick ceramic chip. This thin flexible layer provides sufficient vibration absorption while maintaining a compact structure. The thin film design reduces the added complexity compared to traditional thick ceramic solutions while achieving the same noise reduction goal.
3Object-generated harmful factors
If the thickness of the ceramic chip is increased to block vibrations, then acoustic noise reduction is improved, but manufacturing precision requirements increase
Solution Approach 1:
The damping material's physical parameters (thickness, material composition, damping coefficient) are optimized to achieve effective vibration absorption at reduced thickness. By changing the material parameters rather than simply increasing thickness, the design achieves noise reduction while relaxing manufacturing precision requirements for thickness control.
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 significantly decreases acoustic noise levels by optimizing the size and mounting method of the ceramic chip, achieving noise reduction of 37 dBA or less, compared to 41 dBA or more with previous designs.
Implementation Method 1
a ceramic chip being disposed on a lower portion of the multilayer ceramic capacitor... significantly decreases acoustic noise levels by optimizing the size and mounting method of the ceramic chip
Data Source
AI summary
A composite electronic component includes a composite body in which a multilayer ceramic capacitor and a ceramic chip are coupled to each other, the multilayer ceramic capacitor including a first ceramic body in which a plurality of dielectric layers and internal electrodes disposed to face each other with respective dielectric layers interposed therebetween are stacked, and first and second external electrodes disposed on both end portions of the first ceramic body, and the ceramic chip being disposed on a lower portion of the multilayer ceramic capacitor and formed of a ceramic material having substantially no piezoelectric property, wherein a ratio (T/L) of thickness (T) of the ceramic chip to length (L) of the multilayer ceramic capacitor is selected to minimize vibration of the ceramic chip.