MLCC Interposer Recess Structure for Acoustic Noise Reduction
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Solution Overview
Problem
Existing multilayer ceramic capacitors face challenges in reducing or preventing the occurrence of acoustic noise, particularly when mounted on boards.
Innovation Solution
The proposed solution involves a multilayer ceramic capacitor design that includes a capacitor main body with a multilayer body of dielectric and internal electrode layers, and two interposers with specific recess portions to reduce acoustic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If interposers are provided on the capacitor main body to suppress acoustic noise, then acoustic noise is reduced, but device complexity increases
Solution Approach 1:
The interposer is divided into multiple recess portions (first recess portion and second recess portions) that segment the stress distribution area. This segmentation allows the interposer to effectively suppress acoustic noise by distributing stress across multiple zones rather than concentrating it in a single area, thereby reducing the harmful acoustic effects while maintaining structural functionality.
Solution Approach 2:
The interposer features localized recess portions at specific positions (first recess portion in the width direction, second recess portions at both sides) rather than uniform structure throughout. This local quality modification creates specific stress relief zones where needed, effectively targeting acoustic noise suppression at critical locations without requiring complex modifications across the entire device structure.
2Strength
If the interposer structure with recess portions is implemented, then stress concentration is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The interposer employs an asymmetric structure with a first recess portion and two second recess portions positioned at different locations (width direction vs. sides). This asymmetric design naturally distributes stress in non-uniform patterns that match the actual stress concentration zones, reducing peak stress more effectively than symmetric designs while the geometric features remain simple enough for standard manufacturing processes.
Solution Approach 2:
The recess portions in the interposer feature curved surfaces rather than sharp angular transitions. This curvature eliminates stress concentration at geometric discontinuities and provides smoother stress flow paths, reducing peak stresses while the curved geometries can be formed using conventional molding or machining techniques without requiring ultra-precise manufacturing tolerances.
Data Source
AI summary
A multilayer ceramic capacitor includes a capacitor main body including a multilayer body including dielectric layers and internal electrode layers alternately laminated therein, and external electrodes each at one of two end surfaces of the multilayer body and connected to the internal electrode layers, and two interposers on a surface in a lamination direction of the capacitor main body, and opposed and spaced apart from each other in a length direction connecting the two end surfaces. The two interposers each include a first recess portion on an end surface of the interposer opposed to an end surface facing the other interposer, in an area around a middle portion of the interposer in a width direction, and second recess portions on both sides in the width direction of the first recess portion, and each having a thickness of about ±10% of a half of a thickness of the interposer.