Multilayer Ceramic Capacitor Tapering Faces Electrode Connection
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Solution Overview
Problem
Multilayer ceramic capacitors with L-shaped external electrodes face challenges in maintaining capacitance increase when the thickness of margin parts in the height direction is reduced, as it affects the proper formation and connection of external electrodes, leading to potential height changes or poor connections.
Innovation Solution
Incorporating tapering faces on the capacitor body's sixth face to accommodate errors in the end height of external electrodes, ensuring proper formation and connection without diminishing capacitance benefits, even with smaller margin part thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of margin parts in the height direction is reduced to meet size reduction demands, then the external dimensions can be minimized, but the proper formation and connection of external electrodes cannot be ensured, leading to height changes or poor connections
Solution Approach 1:
The invention introduces tapering faces on the sixth face of the capacitor body, creating a dimensional transition from a flat surface to an inclined surface. This dimensional change allows the external electrodes to be properly formed and connected even when the margin part thickness is reduced, as the tapering face provides the necessary space for electrode formation without increasing the overall height of the capacitor.
Solution Approach 2:
The invention changes the geometric parameters of the capacitor body by introducing tapering faces with specific inclination angles and dimensions. These parameter changes allow the margin part thickness to be reduced while maintaining the ability to form external electrodes properly, thus resolving the contradiction between size reduction and manufacturing precision.
2Quantity of substance
If L-shaped external electrodes are used to increase capacitance by expanding the capacitor body dimensions, then the capacitance increases, but the height-direction dimension cannot be sufficiently utilized when margin part thickness is small
Solution Approach 1:
By introducing tapering faces on the sixth face, the invention creates additional usable space in the height direction without increasing the overall capacitor height. This allows L-shaped external electrodes to be properly formed and connected, enabling full utilization of the height-direction dimension for capacitance increase even when margin part thickness is reduced.
Solution Approach 2:
The tapering faces are introduced locally on the sixth face of the capacitor body, creating a specific region with different geometric properties. This local quality change allows the external electrodes to be properly formed in the tapering region while maintaining the compact overall dimensions of the capacitor, thus enabling capacitance increase without increasing height.
3Productivity
If the thickness of margin parts is minimized to meet size reduction demands, then the compactness is improved, but the external electrodes cannot be properly formed without height changes or connection issues
Solution Approach 1:
The introduction of tapering faces creates a dimensional transition that provides sufficient space for external electrode formation and connection even when margin part thickness is minimized. This ensures reliable electrode connections while maintaining the compact size of the capacitor, thus resolving the contradiction between productivity and reliability.
Solution Approach 2:
The tapering faces are designed in advance to accommodate potential variations in electrode formation processes. By providing this preliminary geometric compensation, the invention ensures that external electrodes can be reliably formed and connected even when margin part thickness is minimized, thus cushioning against potential connection failures.
Data Source
AI summary
In an embodiment, a multilayer ceramic capacitor 10 includes a capacitor boy 11 which has a sixth face f6 provided with a first tapering face f6a over the entire width direction and at a position adjacent to a first face f1, and which also has a second tapering face f6b over the entire width direction and at a position adjacent to a second face f2. The height-direction dimension of the first tapering face f6a on the sixth face f6 is constituted in a manner accommodating an error in the end height of the first part 12a of the first external electrode 12, while the height-direction dimension of the second tapering face f6b on the sixth face f6 is constituted in a manner accommodating an error in the end height of the first part 13a of the second external electrode 13.