Multilayer Ceramic Capacitor Layout to Minimize Bending
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Solution Overview
Problem
As multilayer ceramic capacitors become thinner, they experience a decrease in mechanical strength due to bending and warping, which can be exacerbated by the difference in thickness between regions with and without inner electrodes, leading to potential mechanical failure during mounting.
Innovation Solution
The design of thin tetragonal multilayer ceramic capacitors with specific dimensions (0.85≤L/W≤1.00) and the inclusion of peripheral electrodes between inner electrodes, which reduce the difference in level corresponding to the thickness of inner electrode layers, thereby minimizing bending and enhancing mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the multilayer ceramic capacitor is made thinner, then the size reduction is achieved, but the mechanical strength decreases
Solution Approach 1:
The patent changes the geometric parameters of the capacitor by controlling the aspect ratio (L/W between 0.85-1.00) and optimizing the relationship between thickness and lateral dimensions. This parameter optimization allows thin capacitors to maintain sufficient mechanical strength by preventing excessive bending while achieving size reduction.
Solution Approach 2:
The patent introduces asymmetric electrode configurations where peripheral electrodes are positioned at specific locations rather than uniformly distributed. This asymmetric arrangement creates internal stress distribution that counteracts bending moments, allowing thin capacitors to maintain mechanical integrity during mounting processes.
2Length of stationary object
If the capacitor is made thinner, then the thickness reduction is achieved, but the warping increases
Solution Approach 1:
The patent applies local quality by creating regions with different electrode configurations. Peripheral electrodes are strategically positioned to provide local reinforcement in areas prone to warping, while the central region maintains thin profile. This localized structural differentiation enables thickness reduction without uniform warping across the entire capacitor surface.
Solution Approach 2:
The patent creates equipotential stress distribution through the peripheral electrode configuration. By positioning electrodes to balance internal stresses, the capacitor maintains a flat profile during firing and mounting processes, preventing warping even at reduced thickness.
3Reliability
If the distance between outer electrodes is increased, then the electrical performance is improved, but the bending increases
Solution Approach 1:
The patent resolves the contradiction by transitioning from a single-dimensional approach to a two-dimensional electrode arrangement. Peripheral electrodes are positioned at strategic locations around the capacitor periphery, creating a distributed support structure that spans multiple dimensions. This allows adequate electrical isolation and performance while the distributed configuration provides mechanical support against bending.
Solution Approach 2:
The patent applies preliminary action by pre-positioning peripheral electrodes during the green sheet lamination stage. These electrodes are strategically placed before firing to create a scaffold structure that prevents bending during subsequent processing and mounting, while still allowing the required electrical performance.
Data Source
AI summary
A multilayer ceramic capacitor includes a multilayer body including first and second surfaces facing each other in a lamination direction, third and fourth surfaces facing each other in a first direction, and fifth and sixth surfaces facing each other in a second direction, and four outer electrodes on the multilayer body. About 0.85≤L/W≤ about 1.00 is satisfied. The multilayer body includes a first inner electrode including an end exposed on the third and fifth surfaces and another end exposed on the fourth and sixth surfaces, a second inner electrode including one end exposed on the third and sixth surfaces and another end exposed on the fourth and fifth surfaces, and a peripheral electrode in a region between the first inner electrode and the third to sixth surfaces.