Multilayer Ceramic Component Electrode Fixing Strength
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Solution Overview
Problem
Multilayer ceramic electronic components face difficulties in ensuring fixing strength with solders when mounted on substrates due to the placement of external electrodes on mounting surfaces.
Innovation Solution
The design includes a laminated body with a first external electrode and a pair of second external electrodes, along with insulating coating portions made of dielectric ceramic, resin, or glass, which extend to cover the electrodes, enhancing the fixing strength by creating a gap for solder to fill and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external electrodes are placed on mounting surfaces of laminated bodies, then electrical connection is achieved, but fixing strength with solders deteriorates
Solution Approach 1:
The patent transitions external electrodes from a two-dimensional planar arrangement on the mounting surface to a three-dimensional configuration that extends along the lateral surface of the laminated body. This dimensional change allows solder to access and bond to electrode portions that are not confined to the mounting surface, thereby improving fixing strength while maintaining electrical connection functionality.
Solution Approach 2:
The external electrodes are divided into multiple segments: a first external electrode extending along a first lateral surface, a second external electrode extending along a second lateral surface, and potentially additional electrodes on end surfaces. This segmentation distributes the solder bonding area across multiple surfaces and orientations, enhancing overall fixing strength while preserving the necessary electrical pathways.
2Reliability
If insulating coating portions extend to cover electrodes, then short circuit prevention is achieved, but solder access is restricted
Solution Approach 1:
The insulating coating portions are strategically positioned to cover only specific areas where short circuit prevention is critical, while leaving other areas of the external electrodes exposed. This localized insulation approach ensures that electrical isolation is provided where needed without unnecessarily restricting solder access to the electrode bonding surfaces.
Solution Approach 2:
The insulating coating portions act as intermediaries that separate adjacent electrodes to prevent short circuits, while the exposed portions of the external electrodes serve as intermediaries for solder bonding. This dual-function configuration allows the system to simultaneously achieve electrical isolation and mechanical attachment without compromising either function.
Data Source
AI summary
A multilayer ceramic electronic component includes a laminated body, a first external electrode, a pair of second external electrodes, and a pair of insulating coating portions. The pair of insulating coating portions extends in a laminating direction between each of the pair of second external electrodes and the first external electrode on a second principal surface, from the second principal surface to respective portions of a first side surface and a second side surface. As viewed from at least one direction in the laminating direction, an end of the first external electrode and pair of second external electrodes, which is located closest to a first principal surface, is located closer to the first principal surface than an end of the pair of insulating coating portions, which is located closest to the first principal surface.