Laminated Capacitor Strain Reduction via Asymmetric Outer Layers
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Solution Overview
Problem
Existing laminated capacitors generate significant acoustic noise due to mechanical strain induced by electric field-induced strain of the dielectric layer, and while increasing the distance from the mounting surface helps reduce noise, there is still room for further reduction.
Innovation Solution
The design of a laminated capacitor with a multilayer body having specific geometric relationships and material compositions to minimize strain deviation, including a rectangular shape with particular thickness and length ratios, and using Ni components in conductor layers and electrodes to integrate strain reduction, effectively reducing acoustic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the distance from the mounting surface to the capacitor conductor is increased, then acoustic noise is reduced, but the capacitor size increases
Solution Approach 1:
The patent applies local quality by creating asymmetric outer layer portions with different thicknesses (first outer layer portion and second outer layer portion having different thicknesses) to locally compensate for strain distribution. This allows noise reduction through targeted structural modification rather than uniformly increasing the entire capacitor size, thereby addressing the contradiction between noise reduction and size increase.
Solution Approach 2:
The patent changes geometric parameters of the capacitor structure, specifically the thicknesses of outer layer portions and the dimensions of the main portion, to optimize strain distribution. By adjusting parameters GT1, GT2, GW, GL, ML, and MW to satisfy specific relationships, the patent achieves noise reduction while controlling overall size, resolving the contradiction between these two factors.
2Object-affected harmful factors
If the distance from the mounting surface to the capacitor conductor is increased to reduce noise, then acoustic noise is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent segments the capacitor structure into distinct functional portions: a main portion and outer layer portions (first and second outer layer portions with different thicknesses). This segmentation allows independent optimization of each portion's thickness to control strain distribution, achieving noise reduction through a systematic yet manageable structural design that doesn't excessively complicate manufacturing.
Solution Approach 2:
The patent introduces asymmetry by designing the first outer layer portion and second outer layer portion with different thicknesses. This asymmetric structure compensates for non-uniform strain distribution in the multilayer body, effectively reducing acoustic noise while maintaining a relatively simple manufacturing process that can handle asymmetric geometries.
3Object-affected harmful factors
If the multilayer body geometry is optimized to reduce strain deviation, then acoustic noise is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter relationships (GT1>GL>GW, GT2>GL>GW, SL>SW, and SL/SW>(ML/MW)) that provide clear manufacturing targets. By establishing quantitative relationships between geometric parameters rather than requiring absolute precision, the patent achieves strain deviation reduction while maintaining feasible manufacturing precision requirements.
Solution Approach 2:
The patent focuses precision requirements on critical local regions - the outer layer portions with different thicknesses that directly influence strain distribution. By concentrating geometric control efforts on these specific portions rather than requiring uniform high precision throughout the entire structure, the patent achieves noise reduction with manageable manufacturing precision requirements.
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 proposed design significantly reduces acoustic noise by minimizing strain deviation within the multilayer body, achieving lower sound pressure levels compared to conventional capacitors.
Implementation Method 1
acoustic noise is generated by a laminated capacitor being mechanically strained due to an electric field induced strain of a dielectric layer when a voltage is applied to the laminated capacitor
Data Source
AI summary
A laminated capacitor includes a multilayer body and first and second outer electrodes on a portion of a surface of the multilayer body. Relationships GT1>GL>GW, GT2>GL>GW, SL>SW, and (SL/SW)>(ML/MW) are satisfied, where a thickness of a first outer layer portion is GT1, a thickness of a second outer layer portion is GT2, a width of a side portion is GW, each length of end portions is GL, a length of the multilayer body is SL, a width of the multilayer body is SW, a length of a main portion is ML, and a width of the main portion is MW.