Asymmetric Internal Electrode Layout for Quiet MLCCs
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Solution Overview
Problem
Multilayer ceramic capacitors generate acoustic noise when mounted on a substrate, and existing solutions with spacers are costly and inaccurate in placement.
Innovation Solution
Adjust the positioning of internal electrode layers to reduce the distance between certain end portions and lateral surfaces, eliminating the need for spacers and allowing for reduced size and increased capacitance while preventing acoustic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a spacer is added to reduce acoustic noise, then acoustic noise is reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts and eliminates the spacer component from the capacitor structure. Instead of adding a spacer to reduce acoustic noise, the patent redesigns the internal electrode layer configuration so that the end portions are positioned closer to one lateral surface and farther from the other lateral surface, creating an asymmetric arrangement that reduces vibration and acoustic noise without requiring any additional spacer component.
Solution Approach 2:
The internal electrode layers themselves serve the dual function of providing electrical connectivity and reducing acoustic noise through their asymmetric positioning. The end portions of the internal electrode layers are configured to be closer to one lateral surface and farther from the other, allowing the electrode structure to self-regulate vibration and reduce acoustic noise without external intervention or additional components.
2Object-affected harmful factors
If a spacer is added to reduce acoustic noise, then acoustic noise is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The invention removes the spacer component entirely from the manufacturing process. By configuring the internal electrode layers with asymmetric positioning during the lamination stage, the patent eliminates the need for subsequent spacer placement operations, thereby removing the associated precision requirements and potential placement errors.
3Volume of moving object
If the size of the multilayer body is reduced, then capacitance density increases, but acoustic noise may increase
Solution Approach 1:
The invention applies asymmetry to the internal electrode layer configuration, where the end portions are positioned closer to one lateral surface and farther from the other lateral surface. This asymmetric arrangement creates an uneven distribution of stress and vibration during operation, which reduces acoustic noise generation. The asymmetric design allows the capacitor to maintain a compact size while the strategic positioning of electrode ends mitigates vibration-related acoustic noise.
Data Source
AI summary
A multilayer ceramic capacitor includes dielectric layers and internal electrode layers laminated in a lamination direction, and first and second lateral surfaces opposed to each other in a width direction. A distance between an end portion, closest to the first lateral surface among end portions of the internal electrode layers adjacent to the first lateral surface, and the first lateral surface is smaller than a distance between an end portion, closest to the second lateral surface among end portions of the internal electrode layers adjacent to the second lateral surface, and the second lateral surface. A maximum distance in the width direction between end portions of the internal electrode layers adjacent to the first lateral surface in the width direction is smaller than a maximum distance in the width direction between end portions of the internal electrode layers adjacent to the second lateral surface in the width direction.