Multilayer Capacitor Local Quality Electrostriction
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Solution Overview
Problem
Multilayer capacitors face issues with increased vibrations due to electrostriction when the proportion of internal electrodes connected to different voltages is increased to enhance capacitance, leading to undesired sounds and potential damage during operation.
Innovation Solution
The design includes specific volume proportions of effective layers between external electrodes and internal electrodes, with optimized configurations to minimize electrostriction-induced displacements, reducing substrate vibrations and preventing damage by setting volume proportions in defined areas to specific percentages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the proportion of internal electrodes connected to different voltages is increased to enhance capacitance, then the capacitance is improved, but the vibrations and sounds caused by electrostriction increase
Solution Approach 1:
The patent applies local quality by creating different volume proportion requirements for effective layers in different regions of the capacitor. Specifically, the first region (near the center) requires a higher volume proportion of effective layers (at least 10%) to maintain capacitance, while the second region (near the ends) requires a lower volume proportion (15% or less) to reduce electrostriction vibrations. This spatial differentiation of structural properties resolves the contradiction between maintaining high capacitance and reducing harmful vibrations.
2Quantity of substance
If the proportion of internal electrodes connected to different voltages is increased to enhance capacitance, then the capacitance is improved, but the damage to mounting portions increases
Solution Approach 1:
The patent uses local quality by specifying different volume proportion constraints for effective layers in different spatial regions. The first region (central area) maintains at least 10% effective layer volume proportion to ensure sufficient capacitance, while the second region (end areas near mounting portions) limits effective layer volume proportion to 15% or less. This localized structural optimization reduces electrostriction-induced stress at the mounting portions, preventing damage while preserving overall capacitance performance.
3Volume of moving object
If the size of the multilayer capacitor is reduced, then the productivity and application efficiency are improved, but the capacitance density decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the volume proportion of effective layers as a critical structural parameter. By controlling the effective layer volume proportion to be at least 10% in the first region and 15% or less in the second region, the patent achieves high capacitance density within a reduced overall volume. This parameter optimization allows the capacitor to maintain high capacitance despite smaller dimensions, resolving the contradiction between size reduction and capacitance maintenance.
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 configuration effectively suppresses substrate vibrations and prevents damage while maintaining high capacitance, by optimizing the volume proportions of effective layers in the multilayer capacitor's structure.
Implementation Method 1
During driving of the multilayer capacitors, vibrations attributed to electrostriction can be caused in the dielectric layers connected to different voltages
Data Source
AI summary
A multilayer capacitor includes a capacitor body in which internal electrodes in a first internal electrode group are overlapped with internal electrodes in a second internal electrode group with dielectric layers sandwiched therebetween. A first external electrode has a first wraparound portion and a second wraparound portion, and a second external electrode has a third wraparound portion and a fourth wraparound portion. The volume proportions of the effective layers in a first area sandwiched between the first wraparound portion and the second wraparound portion and in a third area sandwiched between the third wraparound portion and the fourth wraparound portion are set to at least about 10%. The volume proportions of the effective layers in a second area toward a lower surface in the first area and in a fourth area toward the lower surface in the third area are set to about 15% or less. The external dimensions of the multilayer capacitor 1 are about 1.6±0.1 mm in length by about 0.8±0.1 mm in width by about 0.8±0.1 mm in thickness.