Multilayer Ceramic Capacitor Electrode Layout for Reliable Lead-Out Contact
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Solution Overview
Problem
Conventional multilayer ceramic capacitors experience poor connectivity between internal and external electrodes due to the narrow lead-out portion of the internal electrode layer, resulting in insufficient contact area and potential reliability issues.
Innovation Solution
A multilayer ceramic capacitor design where the width of the lead-out portion of the internal electrode layer is narrower than the opposing portion, with a configuration including a base electrode layer, Ni plating layer, and Sn plating layer, ensuring improved connectivity by increasing the contact area between internal and external electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the width of the lead-out portion of the internal electrode layer is made narrow, then the capacitance density is improved, but the connectivity between internal electrode layer and external electrode deteriorates
Solution Approach 1:
The patent extends the lead-out portion of the internal electrode layer in the length direction (along the lamination direction) to increase the contact area with the external electrode, compensating for the reduced width in the width direction. This dimensional transition allows maintaining connectivity reliability while achieving narrow width for improved capacitance density.
Solution Approach 2:
The patent changes the geometric parameters of the lead-out portion by extending its length in the lamination direction while reducing its width, thereby maintaining or increasing the contact area with the external electrode despite the narrower width configuration.
2Quantity of substance
If the width of the lead-out portion of the internal electrode layer is made narrow, then the capacitance density is improved, but the contact area between internal electrode layer and external electrode is reduced
Solution Approach 1:
The patent compensates for the reduced contact area in the width direction by extending the lead-out portion in the length direction (lamination direction), thereby maintaining sufficient contact area with the external electrode while achieving narrow width for improved capacitance density.
Solution Approach 2:
The patent adjusts the geometric parameters of the lead-out portion by reducing its width and extending its length in the lamination direction, thereby maintaining the contact area with the external electrode despite the narrower width configuration.
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 design ensures reliable connectivity between internal and external electrodes, enhancing the performance and reliability of the multilayer ceramic capacitors by increasing the contact area and preventing delamination and short circuits.
Implementation Method 1
The Ni plating layer is provided above the base electrode layer. The Sn plating layer is provided on the Ni plating layer.
Implementation Method 2
ensuring improved connectivity by increasing the contact area between internal and external electrodes
Data Source
AI summary
An external electrode includes a base electrode layer, a Ni plating layer, and a Sn plating layer. The base electrode layer is provided on an element body portion. The Ni plating layer is provided above the base electrode layer. The Sn plating layer is provided on the Ni plating layer. The base electrode layer includes Ni as a primary component and a dielectric material.