Multilayer Capacitor Asymmetric Electrode Design for Carrier Bonding
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Solution Overview
Problem
Existing multilayer capacitors with reduced ESL face challenges in transportation and storage due to the deterioration of outer electrodes when bonded to a carrier sheet on one principal surface, requiring complex and costly holding methods.
Innovation Solution
A multilayer capacitor design with through holes in the inner electrodes for via conductors, where the first and second outer electrodes are only provided on the second principal surface, allowing for a simple bonding method to a carrier sheet without damaging the electrodes, and incorporating a lower protective region with dummy electrodes for enhanced strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multilayer capacitors are bonded to one principal surface of a carrier sheet for simple holding, then holding simplicity and cost are improved, but outer electrodes deteriorate and reliability worsens
Solution Approach 1:
The patent applies asymmetry by concentrating all outer electrodes on only one principal surface of the capacitor main body, while the opposite surface has no outer electrodes. This asymmetric electrode arrangement allows the capacitor to be bonded to the carrier sheet via the electrode-free surface, enabling simple holding methods without damaging the outer electrodes, thus resolving the contradiction between holding simplicity and electrode integrity
Solution Approach 2:
The patent introduces an intermediary approach by designing the capacitor structure itself (asymmetric electrode placement) to accommodate the holding requirement, rather than using complex holding fixtures. This structural intermediary solution enables direct bonding to carrier sheets while protecting the outer electrodes from damage
2Reliability
If carrier tape with recessed portions and sealing tape is used to hold multilayer capacitors, then outer electrode protection is improved, but device complexity and manufacturing cost worsen
Solution Approach 1:
By placing all outer electrodes on one surface only, the patent eliminates the need for complex protective holding structures. The asymmetric design allows capacitors to be simply bonded to flat carrier sheets without requiring recessed portions or sealing tapes, thus reducing device complexity while maintaining electrode protection
Solution Approach 2:
The patent extracts the protective function from complex holding structures (recessed portions and sealing tapes) and integrates it into the capacitor's own structure through asymmetric electrode placement. This eliminates the need for separate protective holding mechanisms, reducing overall device complexity
Data Source
AI summary
A multilayer capacitor includes a capacitor main body including dielectric layers, first inner electrodes, and second inner electrodes that are laminated together, first outer electrodes, second outer electrodes, first via conductors that electrically connect the respective first outer electrodes to the first inner electrodes, and second via conductors that electrically connect the respective second outer electrodes to the second inner electrodes. Through holes are provided in the second inner electrodes, and the first via conductors pass through the through holes. Through holes are provided in the first inner electrodes, and the second via conductors pass through the through holes. The first outer electrodes and the second outer electrodes are not provided on the first principal surface of the capacitor main body and provided only on its second principal surface.