MLCC Cover Structure for Acoustic Noise and Moisture Resistance
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Solution Overview
Problem
Existing multilayer ceramic capacitors face challenges in reducing acoustic noise while maintaining moisture resistance reliability and design freedom.
Innovation Solution
A multilayer electronic component design featuring a body with a capacitance formation portion, upper and lower cover portions, and an identification portion made of water-repellent material and non-conductive heat-resistant paint, where the average thickness of the lower cover portion is greater than that of the upper cover portion, and the identification portion is disposed above the upper cover portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a light cover is disposed on the lower portion of the capacitance formation portion to identify it, then the lower portion can be easily identified, but the design freedom is reduced because the light cover must be thick and the thickness of the upper cover portion is not easily secured
Solution Approach 1:
The patent applies local quality by making the lower cover portion have a different thickness than the upper cover portion. Specifically, the lower cover portion has a greater average thickness than the upper cover portion, creating a localized structural difference that enables identification without requiring a separate light cover. This resolves the contradiction by achieving identification sensitivity through local thickness variation rather than through a thick light cover that would constrain design freedom.
2Difficulty of detecting and measuring
If a light cover is disposed on the lower portion of the capacitance formation portion to identify it, then the lower portion can be easily identified, but the thickness of the upper cover portion is not easily secured which lowers moisture resistance reliability
Solution Approach 1:
The patent resolves this contradiction by applying local quality through asymmetric thickness distribution. The lower cover portion has greater average thickness than the upper cover portion, which provides sufficient material for identification purposes while allowing the upper cover portion to maintain adequate thickness for moisture resistance. This eliminates the need for a separate light cover and ensures both identification sensitivity and moisture resistance reliability are achieved.
3Object-generated harmful factors
If the lower cover portion is made thicker to reduce acoustic noise, then acoustic noise is reduced, but the overall device size increases
Solution Approach 1:
The patent applies local quality by increasing the thickness only of the lower cover portion while keeping the upper cover portion at a standard thickness. This localized thickness increase in the lower cover portion is sufficient to reduce acoustic noise generated by the capacitance formation portion without proportionally increasing the overall device volume, as the thickness increase is confined to a specific region rather than applied uniformly throughout the entire component.
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 acoustic noise while enhancing moisture resistance reliability and allowing for easier identification of the upper and lower portions of the multilayer electronic component.
Implementation Method 1
the identification portion includes a water-repellent material and a non-conductive heat-resistant paint
Implementation Method 2
When applying a direct current or alternating current voltage to a multilayer ceramic capacitor in which internal electrodes overlap each other with a dielectric layer interposed therebetween, a piezoelectric phenomenon occurs between the internal electrodes and vibrations occur
Data Source
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AI summary
A multilayer electronic component may include: a body including a capacitance formation portion including a dielectric layer and an internal electrode alternately disposed with the dielectric layer in a first direction, an upper cover portion disposed above the capacitance formation portion in the first direction, a lower cover portion disposed below the capacitance formation portion in the first direction, and an identification portion disposed above the upper cover portion in the first direction; and an external electrode disposed on the body, and an average thickness of the lower cover portion may be greater than an average thickness of the upper cover portion, and the identification portion may include a water-repellent material and a nonconductive heat-resistant paint.