Thin-Film Capacitor Terminal Structure for Dielectric Withstand Voltage
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Solution Overview
Problem
The existing thin film capacitors have insufficient dielectric withstand voltage due to overlapping terminal electrodes with capacitor electrodes at the end portions.
Innovation Solution
The thin film capacitor design includes specific configurations for terminal electrodes and capacitor electrodes, where terminal electrodes are positioned to avoid overlapping with certain capacitor electrodes, and are connected through sections that facilitate electrical connection while maintaining dielectric integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If terminal electrodes are positioned to overlap with capacitor electrodes at end portions for simplified structure, then device complexity is reduced, but dielectric withstand voltage becomes insufficient
Solution Approach 1:
The terminal electrode is divided into multiple sections (first section, second section, third section) with different functions. The first section overlaps the capacitor electrode for electrical connection, the second section is positioned on the protective insulating film to provide insulation, and the third section connects them. This segmentation allows the terminal electrode to simultaneously achieve both electrical connection and dielectric withstand voltage requirements.
Solution Approach 2:
Different portions of the terminal electrode are given different spatial relationships with the capacitor electrode. The first section is positioned to overlap the capacitor electrode for electrical connection, while the second section is positioned to not overlap the capacitor electrode but only the protective insulating film, creating local variations in electrical connection and insulation properties.
2Ease of operation
If terminal electrodes overlap capacitor electrodes for electrical connection, then ease of operation is improved, but harmful factors increase due to insufficient dielectric withstand voltage
Solution Approach 1:
The protective insulating film serves as an intermediary layer between the terminal electrode and the capacitor electrode. The second section of the terminal electrode is positioned on this protective insulating film, allowing the terminal electrode to maintain electrical connection through the first section while the protective insulating film provides dielectric withstand voltage protection at the second section.
Data Source
AI summary
A thin film capacitor includes a dielectric layer, capacitor electrodes formed respectively on first and second surfaces of the dielectric layer, a protective insulating film formed on the first surface of the dielectric layer so as to embed therein one of the capacitor electrodes, a protective insulating film formed on the second surface of the dielectric layer so as to embed therein another of the capacitor electrodes, and terminal electrodes connected respectively to the capacitor electrodes. One of the terminal electrodes includes a first section positioned on the protective insulating film so as to overlap the other of the capacitor electrodes, a second section positioned on the protective insulating film so as not to overlap the other of the capacitor electrodes, and a third section connecting the first and second sections.