Laminated Varistor Electrode Layout for Stable Capacitance
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Solution Overview
Problem
Existing laminated varistors experience variations in electrostatic capacitance due to manufacturing dimensional errors, which affect their performance, especially in high-frequency applications.
Innovation Solution
A laminated varistor design with a sintered body having a laminated structure, featuring internal and external electrodes arranged in a specific configuration to minimize capacitance variations, including overlapping facing parts and connecting parts that stabilize electrode positions and reduce crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a laminated structure with multiple internal electrodes is used to form multiple capacitive varistor elements, then the electrostatic capacitance can be increased and miniaturization is achieved, but variations in electrostatic capacitance occur due to manufacturing dimensional errors
Solution Approach 1:
The patent applies asymmetry by designing the third internal electrode to extend beyond the second internal electrode in the lamination direction, creating an asymmetric overlapping structure. This asymmetric design ensures that the third internal electrode always has overlapping areas with both first and second internal electrodes, making the capacitance formation less sensitive to dimensional variations in the lamination process.
Solution Approach 2:
The patent utilizes the lamination direction (third direction) as an additional dimension to create overlapping areas between internal electrodes. By extending the third internal electrode beyond the second internal electrode in this dimension, the patent establishes overlapping regions that form capacitive elements, thereby reducing sensitivity to dimensional errors in other directions.
2Volume of moving object
If internal electrodes are arranged to form multiple capacitive varistor elements in one element, then miniaturization is achieved, but crosstalk between electrodes increases
Solution Approach 1:
The patent uses the lamination direction to create vertical stacking of internal electrodes with controlled overlapping areas. This three-dimensional arrangement allows multiple capacitive elements to be integrated in a compact volume while maintaining electrical isolation through the dielectric layers between laminations, thereby reducing crosstalk.
Solution Approach 2:
The patent segments the internal electrodes into distinct first, second, and third internal electrodes with specific overlapping relationships. The third internal electrode is segmented to extend beyond the second internal electrode, creating separate overlapping regions with the first and second internal electrodes. This segmentation isolates the capacitive elements and reduces electromagnetic coupling between them.
Data Source
AI summary
A first internal electrode includes a pair of first connecting parts extending from a first end surface along a first direction to be connected to a first external electrode, and a first facing part provided between the pair of first connecting parts. A second internal electrode includes a pair of second connecting parts extending from a second end surface along the first direction to be connected to a second external electrode, and a second facing part provided between the pair of second connecting parts. A third internal electrode includes a third facing part disposed along the first direction. The third facing part overlaps the first facing part and the second facing part. A first end of the third facing part is disposed between the pair of first connecting parts, and a second end of the third facing part is disposed between the pair of second connecting parts.