Laminated Capacitor Electrode Structure for Terminal Adhesion
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Solution Overview
Problem
Existing multi-terminal type laminated capacitors face challenges in maintaining adhesion of terminal electrodes to ceramic porcelain when reducing the number of layers or internal electrode film thickness to increase equivalent series resistance (ESR), leading to insufficient joining structures and potential terminal electrode exfoliation due to thermal shocks.
Innovation Solution
The design includes thicker extraction electrodes connected to internal electrodes and extending onto the ceramic porcelain's side surface, with optional dummy electrodes, ensuring a robust joining structure even with reduced layers or internal electrode thickness, and a manufacturing method forming these electrode layers on an unbaked ceramic sheet to create a laminated body with ceramic layers in between.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the film thickness of the extraction electrode is reduced to match the internal electrode thickness, then the manufacturing process is simplified, but a sufficient joining structure cannot be provided to the terminal electrode
Solution Approach 1:
The extraction electrode exhibits local quality variation in thickness, being thicker at the joining portion and thinner at the connection portion. This can be achieved through selective printing or deposition processes that apply different paste amounts or deposition conditions to different regions, maintaining manufacturing simplicity while ensuring adequate adhesion.
Solution Approach 2:
The extraction electrode is formed with adequate thickness at the joining portion from the outset, ensuring sufficient adhesion capability before the terminal electrode is applied. This preliminary action prevents adhesion problems that would require complex post-processing or repair operations.
Data Source
AI summary
Electrode layers 121 to 128 are superimposed in a ceramic porcelain 1 with ceramic layers therebetween. The electrode layers 121 to 128 respectively include internal electrodes A1 to A8 and extraction electrodes B1 to B8. Giving a description on the electrode layer 121, one end of the extraction electrode B1 is connected with the internal electrode A1 in the same layer, and the other end of the same is led onto a side surface of the ceramic porcelain 1. Further, the extraction electrode B1 is formed to be thicker than the internal electrode A1 in the same layer.