Multilayer Ceramic Capacitor Side Surface Electrode Moisture Barrier
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Solution Overview
Problem
Conventional multilayer ceramic capacitors face challenges in miniaturization and high capacitance due to the need for thicker external electrodes to prevent moisture entry, which limits the thinning of end surface electrodes.
Innovation Solution
The design includes a laminated body with internal electrodes exposed on side surfaces instead of end surfaces, allowing for thinner end surface external electrodes while maintaining moisture barrier effectiveness through strategic electrode placement and insulation layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the external electrode on the end surface is made thinner to achieve miniaturization and high capacitance, then the capacitance increases and the size decreases, but the ability to suppress moisture entry deteriorates
Solution Approach 1:
The patent changes the exposure position of internal electrodes from end surfaces to side surfaces. This dimensional shift allows the end surface external electrode to be thinned while side surface external electrodes maintain adequate thickness for moisture suppression, resolving the contradiction between miniaturization and moisture protection
Solution Approach 2:
Different regions of the capacitor are given different electrode thickness characteristics. End surface external electrodes are made thin for miniaturization, while side surface external electrodes maintain sufficient thickness for moisture suppression. This localized differentiation resolves the contradiction by optimizing each region for its specific function
2Volume of moving object
If the external electrode on the end surface is made thinner to achieve miniaturization, then the size decreases, but the moisture barrier effectiveness deteriorates
Solution Approach 1:
The patent shifts the internal electrode exposure from end surfaces to side surfaces, enabling thin end surface electrodes for miniaturization while maintaining thick side surface electrodes for moisture barrier functionality
Solution Approach 2:
The patent applies different electrode thickness specifications to different surfaces: thin electrodes on end surfaces for size reduction, and thick electrodes on side surfaces for moisture protection, thereby resolving the contradiction between miniaturization and moisture barrier effectiveness
3Quantity of substance
If the external electrode structure is optimized for high capacitance with thinner electrodes, then the capacitance increases, but the manufacturing complexity increases
Solution Approach 1:
By changing where internal electrodes are exposed (from end surfaces to side surfaces), the patent enables simpler electrode configuration that achieves high capacitance without requiring complex multi-layer electrode structures
Solution Approach 2:
Instead of making end surface electrodes thick for moisture protection, the patent inverts the approach by making side surface electrodes the primary moisture barrier and allowing end surface electrodes to be thin, simplifying the overall electrode structure while maintaining high capacitance
Data Source
AI summary
A multilayer ceramic capacitor includes a laminated body including a plurality of dielectric layers and a plurality of internal electrodes that are alternately laminated, and a first external electrode and a second external electrode provided on the surface of the laminated body. The first external electrode is provided on a first end surface of the laminated body, and extends from the first end surface of the laminated body to form a portion of the first side surface and a portion of the second side surface. The plurality of internal electrodes includes a first internal electrode and a second internal electrode. The first internal electrode is exposed at the first side surface and the second side surface of the laminated body and electrically connected to the first external electrode, and is not exposed at the first end surface of the laminated body.