Multilayer Capacitor Terminal Electrode Side Face Connection
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Solution Overview
Problem
Multilayer capacitors face high equivalent series inductance (ESL) due to long electric current paths, which hinders their performance and size reduction.
Innovation Solution
The design includes terminal electrodes with specific configurations on principal and side faces of the element body, where the distance between leading portions of internal electrodes is minimized, reducing the electric current path length and allowing for downsizing without increasing the capacitor's dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If terminal electrodes are connected to internal electrodes through electrode portions on end faces, then the capacitor structure is simple, but the electric current path becomes long resulting in high ESL
Solution Approach 1:
The patent transitions the terminal electrode connection from the end face (longitudinal direction) to the side face (width direction), effectively changing the spatial dimension of connection. This dimensional shift shortens the current path by utilizing the broader width dimension rather than the longer length dimension, thereby reducing ESL while maintaining structural simplicity
2Volume of moving object
If the capacitor is downsized, then the overall dimensions are reduced, but the current path length may increase relative to the size
Solution Approach 1:
The patent changes the geometric parameters of the capacitor, specifically making the width direction length larger than the height direction length. This parameter modification allows the current path to be routed through the broader width dimension, enabling effective current path length control even as the overall capacitor size is reduced
Data Source
AI summary
An element body has a substantially rectangular parallelepiped shape whose length in a longitudinal direction and length in a width direction are larger than a length in a height direction. The element body has first and second principal faces opposed to each other in the height direction, first and second side faces opposed to each other in the width direction, and third and fourth side faces opposed to each other in the longitudinal direction. A plurality of internal electrodes are alternately arranged in the element body so as to be opposed to each other in the height direction. Each internal electrode has a main electrode portion and a leading portion. Each of a plurality of terminal electrodes has a first electrode portion arranged on the first principal face, and a second electrode portion arranged on the first side face and connected to the leading portion of each corresponding internal electrode.