Multilayer Ceramic Capacitor with Conductive Resin Electrodes
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Solution Overview
Problem
Conventional multi-layered ceramic capacitors face issues with increased capacitance leading to cracking and delamination due to step margins during stacking, and generate acoustic noise due to piezoelectric effects, which are transmitted to substrates through lead terminals.
Innovation Solution
The solution involves forming external electrodes with conductive resin on stack type capacitors, using a laminate structure with alternately stacked ceramic bodies of different polarities and internal electrode structures, and selecting specific ceramic capacitor configurations to absorb vibrations and impacts, reducing acoustic noise and preventing cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of inner electrodes is increased to increase capacitance, then capacitance is improved, but cracks and delamination are easily generated due to large steps with margin parts during stacking
Solution Approach 1:
The capacitor is divided into multiple stacked capacitor devices (first, second, third capacitor devices) with different internal electrode structures. This segmentation allows each device to contribute differently to the overall capacitance while distributing mechanical stress, thereby preventing cracks and delamination that would occur in a single monolithic structure with excessive electrode layers.
Solution Approach 2:
Different capacitor devices are positioned at specific locations within the laminate based on their functional requirements. The first capacitor device with specific internal electrode structure is placed at a location where vibration absorption is needed, while other devices are positioned to maximize capacitance. This local optimization allows the system to achieve high capacitance without compromising reliability.
2Quantity of substance
If conventional dielectric material with piezoelectric properties is used to form multi-layered ceramic capacitor, then capacitance is achieved, but vibration is generated due to piezoelectric effect during voltage application which transmits to substrate causing acoustic noise
Solution Approach 1:
A damping layer is introduced as an intermediary between the capacitor devices and the substrate. This damping layer absorbs the vibrations generated by the piezoelectric effect in the dielectric material, preventing vibration transmission to the substrate and thereby eliminating acoustic noise while preserving the capacitance function of the capacitor devices.
Solution Approach 2:
The piezoelectric effect, which generates harmful vibrations, is converted into a beneficial function by using the first capacitor device's specific internal electrode structure to generate controlled vibrations that are then absorbed by the damping layer. The harmful vibration energy is transformed into heat within the damping material, turning the acoustic noise problem into a thermal management opportunity.
3Quantity of substance
If stack type structure with multiple capacitor devices is used to increase capacitance, then capacitance is improved, but bending strength and thermal shock resistance are reduced
Solution Approach 1:
The laminate is constructed as a composite structure combining multiple capacitor devices with different internal electrode configurations and materials. By strategically selecting and combining these different capacitor device types, the overall structure achieves enhanced mechanical strength and thermal shock resistance while maintaining high capacitance. The composite nature allows optimization of both electrical and mechanical properties.
Solution Approach 2:
The damping layer is positioned beforehand between the capacitor devices and the substrate to provide mechanical cushioning. This pre-positioned cushioning layer absorbs mechanical shocks and thermal stresses before they can damage the capacitor devices, thereby protecting the high-capacitance stack structure from bending and thermal shock failures.
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 approach enhances bending strength, thermal shock resistance, and reliability by reducing acoustic noise and preventing cracks, while maintaining high capacitance.
Implementation Method 1
an electronic component capable of absorbing the vibration due to the dielectric and the impact applied from outside by forming the external electrodes equipped on opposite ends of the laminate with a conductive resin
Implementation Method 2
since a conventional dielectric material to form the multi-layered ceramic capacitor, e.g., barium titanate, has the properties of piezoelectric and electrostrictive, vibration is generated due to the piezoelectric effect during the application of voltage
Data Source
AI summary
An electronic component of a multi-layered structure includes a laminate formed by stacking a plurality of ceramic bodies and an external electrode made of a conductive resin for connecting each ceramic body.