Multilayer Ceramic Capacitor Dummy Electrode Pick-Up
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Solution Overview
Problem
Multilayer ceramic capacitors with a three-terminal structure face damage during electrical characteristic testing and reduced pick-up rates due to collision and friction, and the symmetrical terminal configuration complicates the pick-up process with existing devices.
Innovation Solution
Incorporating a dummy electrode on the surface opposing the mounting surface of the ceramic body to prevent damage and improve pick-up efficiency by maintaining a flat surface and reducing friction, while also optimizing the placement and design of external electrodes to accommodate pick-up devices effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three external electrodes are formed symmetrically with respect to one another in each of upper and lower portions of the multilayer ceramic capacitor, then ESL characteristics are maintained at a low level, but the pick-up rate is reduced in the pick-up process
Solution Approach 1:
The patent applies asymmetry by forming only one dummy electrode on the upper surface rather than symmetric electrodes on both surfaces. This asymmetric configuration maintains the low ESL characteristics through proper electrode layout while resolving the pick-up rate issue by providing a flat upper surface that accommodates the pick-up device nozzle without creating vacuum release spaces
2Ease of operation
If the inner diameter of the nozzle is larger than the width of the external electrode disposed in the center of the ceramic body, then the nozzle can accommodate the electrode, but empty spaces are formed in the nozzle causing vacuum state to be released
Solution Approach 1:
The dummy electrode acts as an intermediary element on the upper surface that fills the empty spaces within the nozzle opening. This mediator maintains the vacuum state during pick-up by preventing air from entering through the gaps between the nozzle and the actual external electrodes, while still allowing the nozzle to accommodate the central external electrode
Data Source
AI summary
A multilayer ceramic capacitor includes: a ceramic body including a plurality of dielectric layers and a plurality of first and second internal electrodes stacked in a width direction; a pair of first external electrodes disposed on a mounting surface of the ceramic body to be spaced apart from one another and connected to the plurality of first internal electrodes; a second external electrode disposed between the pair of first external electrodes on the mounting surface of the ceramic body and connected to the plurality of second internal electrodes; and a dummy electrode disposed on a surface of the ceramic body opposing the mounting surface of the ceramic body.