Multilayer Ceramic Capacitor with Extended Electrodes for High Density
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Solution Overview
Problem
There is a need to miniaturize and increase the capacity of multilayer ceramic capacitors to address the increasing demand for high-frequency noise removal in miniaturized and multi-functional electronic devices, while also reducing acoustic noise and improving mounting density.
Innovation Solution
A multilayer ceramic capacitor design featuring a ceramic body with dielectric layers, internal electrodes, and external electrodes, where the internal electrodes are horizontally disposed with respect to the mounting surface, and the external electrodes are extended to the main surfaces, covered by insulating layers to reduce acoustic noise and enhance capacitance, with a thicker lower cover layer and identifying features for proper orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the multilayer ceramic capacitor is miniaturized to increase mounting density, then the mounting density is improved, but the capacitance decreases
Solution Approach 1:
The patent extends external electrodes from side surfaces to main surfaces, utilizing the surface area of main surfaces for electrical connection. This dimensional extension allows for larger effective electrode area and higher capacitance within a compact footprint, resolving the contradiction between miniaturization and capacitance maintenance.
Solution Approach 2:
The patent integrates multiple functions into the main surface: electrical connection, mounting surface, and identification surface. By merging these functions into a single surface area, the capacitor achieves high mounting density while maintaining sufficient capacitance through the extended electrode configuration.
2Quantity of substance
If the external electrodes are extended to the main surfaces to increase capacitance, then the capacitance is improved, but the device complexity increases
Solution Approach 1:
The main surface serves multiple functions simultaneously: as an electrical connection surface for extended external electrodes, as a mounting surface for PCB attachment, and as an identification surface with identifying features. This multi-functionality increases capacitance without proportionally increasing complexity, as the same surface area accomplishes multiple tasks.
3Productivity
If the internal electrodes are horizontally disposed to increase mounting density, then the mounting density is improved, but the acoustic noise increases
Solution Approach 1:
The patent introduces insulating layers as intermediary elements that cover the external electrodes on side surfaces. These insulating layers act as mediators that prevent acoustic noise generation from electrode interactions while maintaining the horizontal electrode configuration for high mounting density. The insulating layers dampen vibrations and reduce noise without compromising the compact horizontal layout.
4Object-generated harmful factors
If the insulating layers are added to cover the external electrodes to reduce acoustic noise, then the acoustic noise is reduced, but the device complexity increases
Solution Approach 1:
The insulating layers serve multiple functions: reducing acoustic noise by damping electrode vibrations, providing electrical insulation, and potentially serving as a mounting surface or identification surface. This multi-functionality reduces acoustic noise without proportionally increasing complexity, as the same insulating layers accomplish multiple protective and functional roles.
Data Source
AI summary
A multilayer ceramic capacitor includes: a ceramic body; an active layer disposed in the ceramic body and including first internal electrodes each having a first lead part exposed to at least one of the first and second side surfaces, and second internal electrodes each having a second lead part exposed to the at least one of the first and second side surfaces, thereby forming capacitance; an upper cover layer formed on an upper portion of the active layer in the thickness direction; a lower cover layer formed on a lower portion of the active layer in the thickness direction and having a thickness greater than that of the upper cover layer; a first external; and a second external electrode.