Multilayer Ceramic Capacitor Conductor Layer Extension
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Solution Overview
Problem
Multilayer ceramic capacitors face issues with insufficient joint strength between the ceramic multilayer body and the conductor layer, leading to potential peeling of the conductor layer, and unreliable electrical connections between the conductor layer and external electrodes.
Innovation Solution
The conductor layer extends to the main surfaces of the ceramic multilayer body, providing a two-dimensional electrical connection to external electrodes, thereby enhancing joint strength and reliability of electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conductor layer is formed to cover the end surface of the ceramic multilayer body, then moisture resistance is improved, but joint strength between the ceramic multilayer body and conductor layer is insufficient
Solution Approach 1:
The conductor layer is extended from merely covering the end surface to also covering portions of the main surfaces of the ceramic multilayer body. This dimensional extension increases the contact area between the conductor layer and the ceramic multilayer body, thereby improving joint strength while maintaining the moisture resistance function.
2Strength
If common ceramic material is included in the conductor layer to improve joint strength, then peel-off is suppressed, but electrical connection between internal electrodes and conductor layer is interfered with
Solution Approach 1:
Different regions of the conductor layer are designed with different functions: the portion on the end surface provides moisture resistance, while the extended portions on the main surfaces provide both mechanical bonding and electrical connection. This local differentiation allows the conductor layer to simultaneously achieve strong adhesion and reliable electrical connectivity without using ceramic materials that would interfere with conductivity.
3Device complexity
If conductor layer and external electrode are connected by linear connection only, then structure is simple, but reliability of electrical connection is insufficient
Solution Approach 1:
The electrical connection between the conductor layer and external electrode is transformed from a linear connection to a two-dimensional connection by extending the conductor layer onto the main surfaces. This dimensional change increases the contact area and provides multiple parallel conduction paths, significantly improving electrical connection reliability while maintaining structural simplicity.
Data Source
AI summary
A multilayer ceramic capacitor includes a ceramic multilayer body including ceramic layers and internal electrodes that are layered, main surfaces, side surfaces, and end surfaces, a conductor layer covering each of the end surfaces of the ceramic multilayer body and electrically connected to the internal electrodes, an insulating layer covering the conductor layer, and an external electrode electrically connected to the conductor layer. The conductor layer includes a portion that extends to a portion of each of the main surfaces of the ceramic multilayer body.