Multi-Layer Ceramic Capacitor Side Margin Entry Electrode
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Solution Overview
Problem
Existing multi-layer ceramic capacitors face challenges in achieving high connection strength between external electrodes and the body, particularly when side margins are provided in a subsequent step, which complicates the formation of dummy electrodes and affects insulation properties.
Innovation Solution
The design includes a multi-layer ceramic capacitor with a body featuring a multi-layer unit and side margins, where the external electrode has an entry portion that covers the body from the end surface and enters the gap between the side surface and the side margin, ensuring a wide connection area between the external electrode and internal electrodes, thereby enhancing connection strength while maintaining moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If side margins are provided to the side surfaces of the multi-layer chip in a subsequent step, then the intersectional area of internal electrodes can be enlarged, but forming dummy electrodes in the side margins requires advanced technical capabilities and complicates the manufacturing process
Solution Approach 1:
The invention extracts the dummy electrode formation step from the side margin processing and replaces it with a simplified approach where the external electrode directly enters the gap between the side surface and side margin. This eliminates the need for complex dummy electrode formation in the side margins while maintaining the enlarged intersectional area benefit.
Solution Approach 2:
Instead of forming dummy electrodes in the side margins to achieve good connection, the invention inverts the approach by having the external electrode enter the gap between the side surface and side margin directly. This reverse approach achieves both good connection strength and simplified manufacturing.
2Reliability
If the external electrode connection area is enlarged to increase connection strength, then the reliability improves, but the device complexity increases due to the need for side margins and entry portions
Solution Approach 1:
The side margin serves multiple functions: it provides insulation for the internal electrodes and creates a gap structure that enables the external electrode to enter and form a large connection area. This multi-functionality achieves improved reliability without proportionally increasing complexity.
Solution Approach 2:
The invention utilizes the gap dimension between the side surface and side margin to create an entry portion for the external electrode. This three-dimensional configuration allows the external electrode to connect to internal electrodes through both the end surface and the side gap, enlarging the effective connection area without significantly increasing overall device complexity.
3Strength
If dummy electrodes are formed in the side margins to improve connection strength, then the connection between external electrode and body is enhanced, but the manufacturing process becomes more difficult
Solution Approach 1:
The invention removes the dummy electrode formation step from the manufacturing process entirely. Instead, the external electrode directly enters the gap between the side surface and side margin, achieving strong connection without the need for complex dummy electrode formation in the side margins.
Solution Approach 2:
The gap between the side surface and side margin naturally provides the connection pathway for the external electrode. The structure itself facilitates the connection without requiring additional dummy electrodes, making the manufacturing process easier.
Data Source
AI summary
A multi-layer ceramic capacitor includes a body including a multi-layer unit and a side margin, and an external electrode. The multi-layer unit includes ceramic layers laminated in a first direction, first and second internal electrodes alternately disposed between the ceramic layers, an end surface oriented in a second direction orthogonal to the first direction, the first internal electrode being drawn from the end surface, an end margin disposed between the end surface and the second internal electrode, and a side surface oriented in a third direction orthogonal to the former directions, the internal electrodes being exposed to the side surface. The side margin covers the side surface. The external electrode includes an entry portion and covers the body from the side of the end surface, the entry portion being disposed on the end margin and entering a gap between the side surface and the side margin from the end surface.