Multilayer Capacitor Electrode Layout to Prevent Mounting Protrusions
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Solution Overview
Problem
Existing multilayer ceramic capacitors face issues with protrusions and alignment problems during mounting, leading to potential cracks and unintended forces due to the exposure of internal electrode edges and the formation of external electrodes.
Innovation Solution
The design incorporates a first base electrode positioned at the innermost edge of the external electrode, with an inclined end surface, reducing the likelihood of protrusions and improving alignment by ensuring the edges are aligned with the internal electrodes, thus minimizing mechanical stress during mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal electrode edges are exposed from side surfaces of the body, then the external electrodes can be formed to connect internal electrodes, but protrusions occur and alignment problems arise during mounting
Solution Approach 1:
The patent applies preliminary action by forming a recessed shape on the side surfaces of the body before forming the external electrodes. This recessed shape is created in advance to prevent protrusions from forming when the external electrodes are subsequently formed on the internal electrode edges. The recessed configuration is prepared beforehand so that when metal is deposited and formed into external electrodes, they remain flush with the body surface rather than protruding.
Solution Approach 2:
The patent introduces an intermediary structure - the recessed shape formed on the side surfaces - that mediates between the internal electrode edges and the external electrode formation. This recessed configuration acts as an intermediate geometric feature that allows the external electrodes to be formed without creating protrusions, thereby resolving the conflict between electrical connectivity and mechanical alignment.
2Reliability
If base electrodes are provided on side surfaces and metal is deposited by plating to form external electrodes, then electrical connection is achieved, but protrusions and unintended forces occur during mounting
Solution Approach 1:
The patent applies preliminary action by pre-forming recessed shapes on the side surfaces at specific locations where external electrodes will be formed. This preliminary geometric preparation ensures that when base electrodes are provided and metal is deposited by plating, the resulting external electrodes will be contained within the recessed regions, preventing protrusions that could cause cracks or unintended forces during mounting operations.
3Reliability
If external electrodes cover side surfaces and top/bottom surfaces, then electrical connectivity is improved, but alignment precision deteriorates due to protrusions
Solution Approach 1:
The patent applies preliminary action by forming recessed shapes on the side surfaces before applying external electrodes. This preliminary geometric configuration ensures that when external electrodes are formed to cover the side surfaces and top/bottom surfaces, they will be contained within the recessed regions rather than protruding. This maintains both electrical connectivity and alignment precision by preventing protrusion formation.
Data Source
AI summary
In a multilayer electronic component, an effective part includes alternately stacked dielectric layers and internal electrodes. A cover overlaps the effective part from a first side in the stacking direction. A base electrode overlaps the cover from the first side. The effective part has an end surface facing a third side, among third and fourth sides, in a first direction intersecting the stacking direction. Multiple internal electrodes each include an exposed edge exposed from the end surface. At least some of the exposed edges have different positions in the first direction. The base electrode is located in a third-side region of a first-side surface of the cover. A position of the exposed edge located farthest toward the fourth side is an innermost position. A third-side edge of the base electrode is located at the innermost position or farther toward the fourth side than the innermost position.