MLCC Connection Terminal Indentations for Acoustic Noise Suppression
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Solution Overview
Problem
Multilayer capacitors (MLCCs) in electronic devices generate acoustic noise due to piezoelectric deformations under applied voltage, which can be misinterpreted as device failure in quiet environments and degrade audio output quality, and high-frequency vibrations can malfunction sensors in IT and industrial fields.
Innovation Solution
The electronic component design features a capacitor body with dielectric layers and internal electrodes, along with external electrodes and connection terminals, where specific cut portions and indentations are strategically placed to reduce vibrations transmitted to the substrate, thereby minimizing acoustic noise in audible frequencies and high-frequency vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a multilayer capacitor uses a dielectric material with piezoelectric properties to achieve high capacitance, then the capacitance performance is improved, but acoustic noise is generated in the audible frequency range
Solution Approach 1:
The connection terminal is segmented by forming cut portions that divide it into multiple sections. This segmentation disrupts the continuous vibration transmission path, reducing acoustic noise while maintaining the piezoelectric properties of the dielectric material for high capacitance performance
Solution Approach 2:
The cut portions are strategically positioned at specific locations on the connection terminal where vibration transmission is most significant. This local modification targets the harmful vibration paths without affecting the overall capacitance function of the dielectric material
2Speed
If the multilayer capacitor operates at high frequency to improve response time, then the response time is reduced, but high-frequency vibrations cause sensor malfunctions
Solution Approach 1:
The connection terminal is divided into multiple sections by cut portions, which breaks up high-frequency vibration waves and prevents them from transmitting to sensors, while allowing the capacitor to maintain fast response times for high-speed operation
3Ease of manufacture
If the multilayer capacitor uses a standard rectangular connection terminal to simplify manufacturing, then the ease of manufacture is improved, but vibration transmission to the substrate is maximized
Solution Approach 1:
Rather than using a completely different terminal shape, the invention introduces cut portions into the standard rectangular terminal design. This maintains manufacturing simplicity while effectively reducing vibration transmission through the segmented structure
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 design effectively suppresses acoustic noise in the audible frequency range and high-frequency vibrations, preventing sensor malfunctions and reducing internal fatigue, thus enhancing the operational reliability of electronic devices.
Implementation Method 1
Since a dielectric material of the multilayer capacitor may have piezoelectric properties, it may be deformed in synchronization with an applied voltage. When a period of the applied voltage is in an audible frequency band, displacement may form oscillations and may be transmitted to a substrate through a solder. In turn, vibrations in the substrate may be experienced as sound.
Implementation Method 2
Each respective connection terminal of the first and second connection terminals has a shape including at least one indentation in a rectangular outline within which the respective connection terminal is inscribed. This design effectively suppresses acoustic noise in the audible frequency range and high-frequency vibrations, preventing sensor malfunctions and reducing internal fatigue.
Data Source
AI summary
An electronic component includes a capacitor body including a plurality of dielectric layers and a plurality of first and second internal electrodes alternately disposed in a width direction. The capacitor body has first to sixth surfaces, the first and second internal electrodes being exposed through the third and fourth surfaces, respectively. First and second external electrodes are disposed on the third and fourth surfaces and extend to portions of the first surface. A first connection terminal and a second connection terminal are disposed to be respectively connected to be connected to the first and second external electrodes, and each has a shape including at least one indentation in a rectangular outline within which the respective connection terminal is inscribed.