Multilayer Capacitor Electrode Bottlenecks for Moisture Resistance
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in moisture resistance reliability and structural stability, particularly during board mounting, due to stress-induced cracks and moisture penetration.
Innovation Solution
The design incorporates a multilayer structure with internal electrodes featuring bottleneck structures that increase the distance between the capacitor's corners and the internal electrodes, reducing moisture penetration while maintaining sufficient capacitance by optimizing the shape and dimensions of these structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the capacitor is made smaller by forming thin dielectric layers and internal electrodes, then the size is reduced, but moisture resistance reliability deteriorates
Solution Approach 1:
The patent applies local quality by creating bottleneck structures at specific locations of the internal electrodes (near corners) while maintaining the overall thin profile. This localized structural modification increases the distance between corner regions and the internal electrode body, providing enhanced moisture resistance at critical areas without compromising the overall miniaturization of the capacitor.
2Reliability
If the internal electrode structure is modified to improve moisture resistance, then reliability improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the internal electrode structure into distinct regions: standard regions and bottleneck structures. The bottleneck structures are segmented features with reduced cross-sectional dimensions at specific locations, creating a modular approach that enhances moisture resistance while maintaining manufacturing feasibility through standardized formation processes.
Data Source
AI summary
A multilayer capacitor includes a body including dielectric layers and internal electrodes and external electrodes disposed on an external surface of the body and connected to the internal electrodes. The body includes a first surface and a second surface to which the internal electrodes are exposed, the first surface and the second surface opposing each other in a first direction, a third surface and a fourth surface opposing each other in a second direction which is a direction in which the dielectric layers are stacked, and a fifth surface and a sixth surface opposing each other in a third direction. At least one of the internal electrodes include a first bottleneck structure having a first directional length of a third-directional outer region smaller than an inner region thereof and a second bottleneck structure having a third directional length of a first directional outer region smaller than an inner region thereof.