Multilayer Ceramic Capacitor Interposers for Low Acoustic Noise
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in reducing or preventing acoustic noise, particularly when mounted on boards, due to the generation of stress and vibration that can lead to noise and instability.
Innovation Solution
The design incorporates interposers with specific recess portions and a unique configuration of external electrodes, including a conductive resin layer that acts as a buffer, and a nickel-plated layer, to absorb vibrations and reduce stress concentrations, thereby minimizing acoustic noise and improving bending strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If interposers are added to suppress acoustic noise, then acoustic noise is reduced, but device complexity increases
Solution Approach 1:
The patent introduces interposers as intermediary elements between the capacitor and the board. These interposers include recess portions that act as vibration-absorbing structures, effectively reducing acoustic noise generated during capacitor operation while maintaining a manageable device architecture through the use of these intermediate components.
2Device complexity
If the capacitor structure is simplified, then device complexity is reduced, but acoustic noise increases
Solution Approach 1:
The patent applies local quality by incorporating recess portions specifically in the interposers at critical locations where vibration occurs. This localized structural modification allows vibration absorption and acoustic noise reduction without requiring a complete redesign of the entire capacitor structure, thus maintaining relative simplicity while addressing the noise issue.
3Object-affected harmful factors
If external electrodes are configured with buffer layers, then acoustic noise is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs composite material structures in the external electrodes, incorporating conductive resin layers and nickel-plated layers. These composite structures serve as buffers that absorb vibrations and reduce acoustic noise. The use of multiple material layers with different properties allows for effective vibration damping while maintaining manufacturability through established multi-layer deposition techniques.
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 solution effectively reduces acoustic noise and enhances the bending strength of the multilayer ceramic capacitors by distributing stress and absorbing vibrations, ensuring better stability and performance when mounted on boards.
Implementation Method 1
a conductive resin layer that acts as a buffer, and a nickel-plated layer, to absorb vibrations and reduce stress concentrations
Implementation Method 2
to absorb vibrations and reduce stress concentrations, thereby minimizing acoustic noise and improving bending strength
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.