Multilayer Ceramic Capacitor with Ferromagnetic Cover Layers
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Solution Overview
Problem
The miniaturization of electronic products limits the increase in the number of stacked internal electrodes in multilayer ceramic capacitors, restricting the enhancement of capacitance without increasing the capacitor's size.
Innovation Solution
Incorporating ferromagnetic layers in the upper and lower cover regions of the multilayer ceramic capacitor, which, when subjected to an external magnetic field, induce magnetostriction in the dielectric layers, increasing their permittivity and thus the capacitance without altering the capacitor's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of stacked internal electrodes is increased to enhance capacitance, then the capacitance is improved, but the device size increases
Solution Approach 1:
The patent applies parameter changes by introducing ferromagnetic layers that alter the magnetic and electrical properties of the dielectric layers. When an external magnetic field is applied, the ferromagnetic layers induce magnetostriction in the dielectric layers, changing their permittivity and thereby increasing capacitance without adding more internal electrodes or increasing device size.
Solution Approach 2:
The patent uses composite materials by combining ferromagnetic layers with dielectric layers to create a multilayer structure. This composite structure enables the dielectric layers to exhibit enhanced permittivity under magnetic field influence, achieving higher capacitance density within the same physical dimensions.
2Quantity of substance
If the number of stacked internal electrodes is increased to enhance capacitance, then the capacitance is improved, but the device complexity increases
Solution Approach 1:
Instead of increasing the number of internal electrodes, the patent changes the magnetic parameter of the dielectric layers by introducing ferromagnetic layers. This approach enhances capacitance through parameter modification rather than structural multiplication, thereby reducing device complexity.
3Quantity of substance
If the size of the capacitor is increased to accommodate more internal electrodes, then the capacitance is improved, but the adaptability to miniaturized electronic products deteriorates
Solution Approach 1:
The patent enables capacitance enhancement through parameter changes in the dielectric layers induced by magnetic fields, allowing high capacitance to be achieved within compact dimensions. This maintains adaptability to miniaturized electronic products while improving capacitance performance.
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 allows for increased capacitance by aligning magnetic spins and changing the lattice constant of the dielectric layers, effectively enhancing permittivity and capacitance without requiring additional internal electrodes, thereby maintaining a compact size.
Implementation Method 1
when subjected to an external magnetic field, induce magnetostriction in the dielectric layers, increasing their permittivity and thus the capacitance
Implementation Method 2
aligning magnetic spins and changing the lattice constant of the dielectric layers, effectively enhancing permittivity and capacitance
Data Source
AI summary
A multilayer ceramic capacitor includes an active region including a plurality of dielectric layers, and first and second internal electrodes alternately disposed with each of the dielectric layers interposed therebetween; and upper and lower cover regions including at least one ferromagnetic layer and disposed on and below the active region, respectively.