Multilayer Coil Component Connection Conductors Electroplating Adhesion
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Solution Overview
Problem
In multilayer coil components, external electrodes not connected to the coil are in an electrically floating state, making it difficult to form an adequate plated layer during electroplating, which weakens adhesion and reduces mounting strength due to insufficient electric field application and potential structural defects from stress differences during sintering.
Innovation Solution
The multilayer coil component design includes first and second connection conductors that electrically connect both pairs of external electrodes to the coil, with smaller connection conductor areas and strategically located within the external electrode profiles to minimize stress and prevent structural defects, ensuring adequate electroplating and enhanced adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only one external electrode of each pair is connected to the coil, then the device complexity is reduced, but the adhesion strength and mounting strength deteriorate due to inadequate electroplating on floating electrodes
Solution Approach 1:
The patent divides the connection structure into two separate connection conductors: one connecting the first external electrodes to the coil, and another connecting the second external electrodes to the coil. This segmentation ensures that all external electrodes are electrically connected rather than left in a floating state, enabling adequate electroplating on all electrodes while maintaining a relatively simple overall structure.
2Reliability
If the connection conductor area is increased, then the electrical connection is improved, but the manufacturing precision deteriorates due to stress-induced internal structural defects during sintering
Solution Approach 1:
The patent optimizes the area parameter of the connection conductors, setting it to a specific range that balances electrical connection requirements with stress management during sintering. By carefully controlling the connection conductor area, the patent achieves adequate electrical connectivity while minimizing volume changes and stress that could cause internal structural defects in the insulator layers.
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 allows for proper electroplating on all external electrodes, improving adhesion strength and preventing internal structural defects by ensuring an adequate electric field and reducing stress-induced issues during the sintering process.
Implementation Method 1
a first connection conductor arranged between the coil and the pair of first external electrodes in the element body and connected to one end of the coil and to the pair of first external electrodes
Implementation Method 2
a second connection conductor arranged between the coil and the pair of second external electrodes in the element body and connected to the other end of the coil and to the pair of second external electrodes
Implementation Method 3
the external electrodes are normally electroplated to improve the solderability
Data Source
AI summary
A multilayer coil component has an element body, a coil, a pair of first external electrodes, a pair of second external electrodes, a first connection conductor, and a second connection conductor. The coil is composed of a plurality of internal conductors arranged in the element body and connected to each other. The first external electrodes are arranged on a first principal face of the element body. The second external electrodes are arranged on the first principal face. The first connection conductor is arranged between the coil and the first external electrodes in the element body and is connected to one end of the coil and to the first external electrodes. The second connection conductor is arranged between the coil and the second external electrodes in the element body and is connected to the other end of the coil and to the second external electrodes.