Capacitor Component ESR Control via Side Electrode Extraction
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Solution Overview
Problem
Multilayer ceramic capacitors with high equivalent series resistance (ESR) face challenges in high-density mounting due to increased impedance and require additional space on the wiring board, which hinders miniaturization and high-density mounting capabilities.
Innovation Solution
A capacitor component design with a specific configuration of dielectric and internal electrode layers, where only a portion of the internal electrode layers are extended to the external electrodes, and connecting conductive layers are used to connect these electrodes, reducing the cross-sectional area of conductive paths and allowing for adjustable ESR while maintaining high-density mounting capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all internal electrode layers are extended directly to the end surface of the element assembly, then the total cross-sectional area of the conductive path is increased and ESR is lowered, but impedance increases due to anti-resonance and other problems occur
Solution Approach 1:
The patent extracts only a portion of the internal electrode layers to be extended to the end surface, while keeping other internal electrode layers connected via terminal conductors on the side surface. This selective extraction reduces the total cross-sectional area of the conductive path, thereby increasing ESR and preventing anti-resonance problems while maintaining electrical connectivity.
2Ease of operation
If terminal conductors are directly connected to conductive patterns and lands on the wiring board, then electrical connection is achieved, but the effect of higher ESR is eliminated and additional space is required on the wiring board
Solution Approach 1:
The patent introduces terminal conductors on the side surface as an intermediary connection method. Instead of directly connecting extended internal electrode layers to the wiring board, the terminal conductors serve as intermediaries that maintain the higher ESR characteristic while still achieving electrical connection. This allows the capacitor to retain its ESR benefits without requiring additional space on the wiring board.
3Adaptability or versatility
If terminal conductors are exposed on the surface of the element assembly, then connection flexibility is improved, but the surface area of the element assembly must be sufficiently secured to prevent mutual short circuit
Solution Approach 1:
The patent moves the terminal conductors from the end surface to the side surface of the element assembly. This dimensional change allows the terminal conductors to be exposed for connection flexibility while not increasing the end surface area, thus preventing mutual short circuits and enabling miniaturization of the element assembly.
Data Source
AI summary
A capacitor component includes an element assembly, a first external electrode, and a second external electrode. The element assembly includes first and second internal electrode layers, a first connecting conductive layer extending along a fifth outer surface of the element assembly and connected to each of the first internal electrode layers, a first covering insulating layer covering the first connecting conductive layer, a second connecting conductive layer extending along a sixth outer surface of the element assembly and connected to each of the second internal electrode layers, and a second covering insulating layer covering the second connecting conductive layer. Only a portion of the first internal electrode layers are extended to the third outer surface and connected to the first external electrode, and only a portion of the internal electrode layers are extended to the fourth outer surface and connected to the second external electrode.