Multilayer Capacitor Electrode Configuration for Adhesion and ESL Reduction
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Solution Overview
Problem
Multilayer capacitors face issues with insufficient adhesiveness between dielectric layers and internal electrodes, leading to variations in electrostatic capacitance and increased Equivalent Series Inductance (ESL) due to lamination misalignment and poor fixing strength during calcination.
Innovation Solution
The design includes a multilayer capacitor with specific configurations of terminal and internal electrodes, where the outer edges of the electrodes are arranged to expose dielectric layers, increasing the area of exposure and improving adhesiveness, and lead portions are connected to lateral surfaces to shorten current paths and reduce ESL.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the internal electrode is led to one end surface of the element body in the longitudinal direction and both end surfaces in the transverse direction, then the electrostatic capacitance can be maintained, but the adhesiveness between dielectric layers and internal electrodes becomes insufficient
Solution Approach 1:
The patent extends the internal electrode from a single-end configuration to a dual-end configuration, where the electrode protrudes from both end surfaces in the longitudinal direction. This dimensional change increases the contact area between the internal electrode and dielectric layers at both ends, thereby improving adhesiveness and fixing strength during calcination without compromising electrostatic capacitance.
Solution Approach 2:
The internal electrode is designed to protrude from both end surfaces before the final assembly is completed. This preliminary extension allows the electrode to establish strong adhesive bonds with the dielectric layers at both ends during the lamination and calcination processes, preventing misalignment and ensuring reliable fixing strength before the capacitor is fully assembled.
2Reliability
If lamination misalignment occurs between internal electrodes, then variations in electrostatic capacitance occur, but increasing the exposed portion of dielectric layers to improve adhesiveness increases device complexity
Solution Approach 1:
The patent applies different configurations to different parts of the internal electrode. The electrode has a main body portion embedded in the dielectric layers and extended portions protruding from both end surfaces. This local differentiation allows the exposed portions at both ends to provide enhanced adhesiveness through increased dielectric exposure, while the embedded portion maintains the electrostatic capacitance function, thereby improving reliability without excessive complexity.
3Reliability
If the internal electrode is extended to both end surfaces, then adhesiveness is improved, but the Equivalent Series Inductance (ESL) increases
Solution Approach 1:
The patent redirects the internal electrode to extend along the lateral surfaces of the element body rather than only in the longitudinal direction. By changing the dimension of electrode extension from purely longitudinal to including lateral surfaces, the current path is optimized to reduce inductance while maintaining the adhesive benefits of extended contact areas at both ends.
Data Source
AI summary
A multilayer capacitor is provided with improved adhesiveness of layers of an element body and improved reliability. Outer edge of a second principal-surface electrode portion are respectively separated from an end surface and lateral surfaces, and are respectively arranged so as to surround the forefront portion of a third principal-surface electrode portion at one end side when viewed from a lamination direction. Outer edges of a fourth principal-surface electrode portion are respectively separated from an end surface and lateral surfaces, and are arranged so as to surround the forefront portion of a first principal-surface electrode portion in the width direction at the other end side when viewed from the lamination direction.