Multilayer Ceramic Capacitor Tapering Face Electrode Design
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Solution Overview
Problem
Conventional multilayer ceramic capacitors with L-shaped external electrodes are prone to separation when the circuit board warps or contracts, causing the external electrode parts to detach from the capacitor body.
Innovation Solution
The multilayer ceramic capacitor design features a capacitor body with tapering faces adjacent to the external electrodes, creating clearances that narrow from the outer side toward the inner side, which helps in preventing separation by allowing solder to flow and bond securely, even under board warping or contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external electrodes are made L-shaped with parts along length-direction and height-direction faces, then mounting capability on circuit boards is improved, but separation occurs between external electrode parts and capacitor body when circuit board warps or contracts
Solution Approach 1:
The invention applies different geometric characteristics to different parts of the external electrode. The first part along the length-direction face maintains a standard configuration for electrical connection, while the second part along the height-direction face is positioned to avoid separation issues. This local differentiation allows the electrode to fulfill both mounting requirements and bonding reliability without uniform modification throughout the entire electrode structure.
Solution Approach 2:
The invention resolves the separation problem by utilizing the height-direction dimension of the capacitor body. By extending part of the external electrode along the height-direction face rather than only along the length-direction face, the design creates a three-dimensional configuration that distributes mechanical stress away from the critical bonding interface, preventing separation when the circuit board warps or contracts.
2Adaptability or versatility
If circuit board warps or extends/contracts, then mounting flexibility is improved, but forces cause external electrode parts to separate from capacitor body
Solution Approach 1:
The invention strengthens the bonding configuration locally at the height-direction face where the external electrode makes contact. By positioning part of the external electrode along the height-direction face, the design creates a localized reinforcement zone that resists separation forces generated during circuit board warping or thermal expansion/contraction, without requiring uniform strengthening of the entire electrode structure.
Solution Approach 2:
The three-dimensional configuration of the external electrode, with parts extending along both length-direction and height-direction faces, acts as a pre-established mechanical cushioning structure. This configuration anticipates and accommodates the forces generated during circuit board warping or thermal changes, distributing these forces across multiple contact points before they can cause separation at the bonding interface.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively suppresses the separation of external electrode parts from the capacitor body during board warping or contraction, ensuring reliable bonding and high-density mounting, even with reduced conductor pad dimensions.
Implementation Method 1
a part of the molten solder on the first external electrode 102 side wets the exterior face of the first part 102a to form a fillet FI, while a part of the molten solder on the second external electrode 103 side wets the exterior face of the first part 103a to form a fillet FI
Data Source
AI summary
In an embodiment, a multilayer ceramic capacitor 10 has a capacitor body 11 having a first face f1 and a second face f2 in a length direction, a third face f3 and a fourth face f4 in a width direction, a fifth face f5 and a sixth face f6 in a height direction, and a first tapering face f5a between face f1 and face f5 and a second tapering face f5b between face f2 and face 5f; a first external electrode 12 that has a first part 12a along face f1, a second part 12b along face f5, and continuously a third part 12c along face f5a; and a second external electrode 13 that has a first part 13a along face f2, a second part 13b along face f5, and continuously a third part 13c along face f5b.