Bottom Land Ceramic Capacitor Dummy Electrodes
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Solution Overview
Problem
The existing Bottom Land Ceramic Capacitors (BLCC) face limitations in production workability and adhesion strength with a mounting substrate due to the restricted formation of external electrodes on a hexahedral body, leading to reduced soldering area and weakened adhesion strength when mounted on a circuit board.
Innovation Solution
A capacitor design that includes dummy electrodes formed on the third and fourth surfaces of the body, extending from the edges where the second surface meets these surfaces, which increases the area for conductive material and improves adhesion strength by forming a plating layer, thereby enhancing capacitance and mounting convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If external electrodes are formed only on the mounting surface of a hexahedral body, then the capacitor structure is simple, but the soldering area is reduced and adhesion strength with the mounting substrate is weakened
Solution Approach 1:
The patent extends electrodes from the traditional two-dimensional mounting surface to three-dimensional surfaces by forming dummy electrodes on the lateral surfaces of the hexahedral body. This dimensional expansion increases the soldering area from only the bottom surface to include lateral surfaces, thereby improving adhesion strength while maintaining structural simplicity.
2Device complexity
If external electrodes are formed only on the mounting surface, then the electrode structure is simple, but the capacitance is limited
Solution Approach 1:
By forming dummy electrodes on the lateral surfaces in addition to the mounting surface, the patent utilizes three-dimensional space for electrode placement. This increases the overlapping area between internal electrodes and external electrodes, thereby increasing capacitance without significantly complicating the electrode structure.
3Ease of operation
If the external electrode is formed on the mounting surface only, then mounting orientation is fixed, but production workability and convenience of consumer use are reduced
Solution Approach 1:
The patent makes the capacitor body universally mountable by forming dummy electrodes on all lateral surfaces. This allows the capacitor to be mounted in any orientation (0°, 90°, 180°, or 270° rotations) while maintaining adequate soldering area and adhesion strength, thereby improving both mounting flexibility and production workability.
Data Source
AI summary
A capacitor includes a body having a first surface, a second surface, and a third surface and a fourth surface connecting the first surface to the second surface, and including a first internal electrode and a second internal electrode respectively having a first lead portion and a second lead portion exposed to the second surface, a first external electrode and a second external electrode formed on the second surface of the body, and electrically connected to the first internal electrode and the second internal electrode, respectively, and dummy electrodes formed on the third surface and the fourth surface of the body and extending from edges at which the second surface meets the third surface and the fourth surface.