Multilayer Electronic Component Insulating Layer Extension Design
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Solution Overview
Problem
Conventional multilayer electronic components face challenges in achieving small size and large capacity while preventing variation in electrostatic capacity and intrusion of plating solution, which leads to reliability degradation.
Innovation Solution
A multilayer electronic component design featuring an element body with internal electrode and dielectric layers alternately laminated, equipped with insulating layers on end surfaces, where the insulating layer extension covers part of the end surfaces and has a specific width ratio, and external electrodes cover the insulating layer extension, ensuring reduced plating solution intrusion and stable electrostatic capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the internal electrode width is reduced to prevent plating solution intrusion, then reliability is improved, but the connection area between internal electrode and external electrode is reduced, making it difficult to achieve small size and large capacity
Solution Approach 1:
The patent extends the insulating layer in the width direction (first axis direction) to create an insulating layer extension portion. This dimensional extension allows the insulating layer to effectively cover the end surfaces and prevent plating solution intrusion without requiring reduction of the internal electrode width in the length direction, thus maintaining sufficient connection area while achieving reliability improvement.
Solution Approach 2:
The insulating layer is designed with non-uniform distribution: it has a standard thickness on the main body and extends further in the width direction at the end surfaces. This local quality change concentrates the anti-plating solution function at critical areas (end surfaces) while preserving the electrical connection function in other areas, resolving the contradiction between reliability and capacity.
2Reliability
If the insulating layer extension width W1 is increased to prevent plating solution intrusion, then reliability is improved, but the area for electrode connection is reduced
Solution Approach 1:
The patent optimizes the width parameter W1 of the insulating layer extension portion to a specific range (1/30 to less than 3/8 of the element body width W0). This parameter change ensures that the insulating layer extension is sufficient to prevent plating solution intrusion while minimizing the reduction of electrode connection area, thus balancing reliability improvement with capacity maintenance.
3Ease of manufacture
If plating solution intrudes into the element body, then manufacturing is simplified, but insulation resistance deteriorates and reliability degrades over time
Solution Approach 1:
The insulating layer extension portion is formed in advance during the manufacturing process, creating a preventive barrier against plating solution intrusion before the plating step occurs. This preliminary action ensures that even though plating solution contacts the external electrodes, it cannot penetrate into the element body, thus maintaining insulation resistance and reliability without complicating the manufacturing process.
Data Source
AI summary
A multilayer electronic component includes an element body having an internal electrode layer and a dielectric layer. These are substantially parallel to a plane including a first axis and a second axis and are alternately laminated along a third axis direction. Side surfaces facing each other in the first axis direction are respectively equipped with an insulating layer. End surfaces facing each other in the second axis direction are respectively equipped with an external electrode. The insulating layer integrally has an insulating layer extension portion covering part of the end surfaces facing each other in the second axis direction. W1/W0 is 1/30 to less than ⅜, where W0 denotes a width along the first axis, and W1 denotes a width along the first axis of the insulating layer extension portion. The external electrode covers at least part of the insulating layer extension portion.