Multilayer Ceramic Component Cover Layer Thickness Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayer ceramic electronic components face reliability issues due to warpage and cracking, particularly when the cover layer is thin, leading to potential short circuits and defects in industrial electronic devices.
Innovation Solution
A multilayer ceramic electronic component design featuring a ceramic main body with internal electrodes and external electrodes composed of a conductive metal layer and a conductive resin layer, where the thickness of the cover layer is maintained at 70 μm or less, and specific geometric relationships between the cover layer, internal electrodes, and margin parts are optimized to prevent cracks and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the cover layer is made thinner to achieve higher capacitance, then the capacitance increases, but the reliability deteriorates due to increased crack risk from substrate warping
Solution Approach 1:
The external electrode is constructed as a composite material system with a metal layer (high conductivity) and a conductive resin layer (flexibility and crack absorption). This composite structure allows the electrode to maintain electrical conductivity while accommodating substrate warping without cracking, thus enabling thinner cover layers for higher capacitance without sacrificing reliability.
Solution Approach 2:
The patent specifies precise parameter ranges: the cover layer thickness Tc is controlled at 1 to 70 μm, the metal layer thickness T1 is 10 to 50 μm, and the conductive resin layer thickness T2 is 5 to 20 μm. These parameter optimizations enable the thin cover layer design to achieve both high capacitance and crack resistance through proper dimensional control.
2Reliability
If a conductive resin layer is added to the external electrode to prevent cracks, then the crack resistance improves, but the device complexity increases
Solution Approach 1:
The external electrode is segmented into two distinct functional layers: a metal layer (T1: 10-50 μm) providing electrical conductivity and a conductive resin layer (T2: 5-20 μm) providing flexibility and crack absorption. This segmentation allows each layer to perform its specific function optimally, improving crack resistance while keeping the overall structure manageable through clear functional division.
3Quantity of substance
If the cover layer thickness is reduced to 70 μm or less, then the capacitance increases, but the manufacturing precision requirements increase to prevent defects
Solution Approach 1:
The patent establishes a specific parameter range for the cover layer thickness Tc of 1 to 70 μm, with corresponding optimized ranges for the metal layer (T1: 10-50 μm) and conductive resin layer (T2: 5-20 μm). These parameter specifications provide clear manufacturing targets and tolerance ranges, making it easier to control the thin cover layer thickness while achieving high capacitance without excessive precision requirements.
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
The design effectively prevents cracks and short circuits, ensuring the reliability and performance of multilayer ceramic electronic components, even when warpage occurs, by using a conductive resin layer to absorb impacts and maintain the structural integrity of the component.
Implementation Method 1
using a conductive resin layer to absorb impacts and maintain the structural integrity of the component
Data Source
AI summary
A multilayer ceramic electronic component includes a ceramic main body having internal electrodes laminated therein; and external electrodes formed on ends of the ceramic main body in a length direction, wherein each external electrode includes a first layer formed on the ceramic main body and including a conductive metal, and a second layer formed on the first layer and including a conductive resin, and when Tc is thickness of a cover layer, Te is thickness of the internal electrode, Td is distance between neighboring internal electrodes, L1 is length from either end of the ceramic main body in the length direction in a region in which the cover layer adjoins a margin part of the ceramic main body to an end of the first layer formed on an upper or lower surface of the ceramic main body, and Lm is length of the margin part, Tc≦70 μm and L1<Lm+Tc×cot 50° are satisfied.