Capacitance Device Electrode Geometry for Displacement Tolerance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Variable capacitance devices face challenges in maintaining stable capacitance due to electrode displacement, leading to variations in capacitance values, especially when using ferroelectric materials with high relative permittivity, where increasing electrode distance or reducing electrode area affects the control voltage and resistance, making it difficult to manufacture devices with desired capacitance.
Innovation Solution
A capacitance device design featuring electrodes with specific shapes and projections that maintain a constant overlapping area even when displaced, ensuring the capacitance remains stable by orthogonal or oblique configurations of electrode portions, allowing for precise control of capacitance and resistance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the distance between electrodes is increased to achieve small capacitance, then the capacitance value decreases, but the control voltage becomes excessively high
Solution Approach 1:
The patent applies local quality by creating different regions within the electrode structure. The first electrode portion has a different shape than the second electrode portion, creating local variations in the electric field distribution. This allows the capacitor to achieve small capacitance values without requiring large electrode separations, thereby maintaining reasonable control voltages while achieving the desired capacitance reduction through localized geometric modifications rather than global scaling.
Solution Approach 2:
The patent transitions from considering only the separation distance between electrodes to incorporating the dimensional shape characteristics of electrodes. By defining specific geometric relationships between the first and second electrode portions (such as overlapping areas, projection relationships, and shape configurations), the invention adds dimensional complexity to the design space, allowing capacitance control through multiple geometric parameters rather than solely through electrode separation distance.
2Speed
If the area of opposing electrodes is reduced to achieve small capacitance, then the capacitance value decreases, but the resistance increases
Solution Approach 1:
The patent applies local quality by creating different regions within the electrode structure. The first electrode portion has a different shape than the second electrode portion, creating local variations in the electric field distribution. This allows the capacitor to achieve small capacitance values without requiring large electrode separations, thereby maintaining reasonable control voltages while achieving the desired capacitance reduction through localized geometric modifications rather than global scaling.
Solution Approach 2:
The patent transitions from considering only the separation distance between electrodes to incorporating the dimensional shape characteristics of electrodes. By defining specific geometric relationships between the first and second electrode portions (such as overlapping areas, projection relationships, and shape configurations), the invention adds dimensional complexity to the design space, allowing capacitance control through multiple geometric parameters rather than solely through electrode separation distance.
3Ease of manufacture
If electrodes are displaced during manufacturing, then manufacturing simplicity is maintained, but capacitance stability deteriorates
Solution Approach 1:
The patent applies beforehand cushioning by designing an electrode structure that anticipates and compensates for potential manufacturing displacements. The specific geometric configuration of the first and second electrode portions creates a tolerance buffer that absorbs alignment variations without significantly affecting capacitance. This pre-designed compensation mechanism ensures that even if electrodes are displaced during manufacturing, the capacitance remains stable, effectively cushioning against manufacturing imprecision.
Solution Approach 2:
The patent employs a composite geometric structure combining different electrode shapes and configurations. By integrating multiple geometric elements (first electrode portion, second electrode portion, overlapping regions, projection relationships) into a unified design, the invention creates a composite structure that simultaneously achieves manufacturing tolerance and capacitance stability, leveraging the complementary strengths of different geometric components.
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 design stabilizes capacitance values and reduces electrode resistance, enabling the manufacture of variable capacitance devices with desired capacitance while maintaining low voltage drive capabilities and cost-effectiveness.
Implementation Method 1
a dielectric layer 10, a first electrode 11 formed on a predetermined surface of the dielectric layer 10, and a second electrode 12 formed on an opposite surface of the dielectric layer 10
Implementation Method 2
To fabricate a variable capacitance device with a small capacitance by using a ferroelectric material with a large relative permittivity
Data Source
AI summary
To suppress changes in capacitance due to displacement between electrodes opposing each other across a dielectric layer, thereby allowing stable manufacturing of a capacitance device having a desired capacitance. A capacitance device is of a configuration including a dielectric layer, a first electrode formed on a predetermined surface of the dielectric layer, and a second electrode formed on a surface on the opposite side of the dielectric layer from the predetermined surface. The forms of the first and second electrodes are set so that even in the event that the first electrode is relatively displaced regarding position in a predetermined direction as to the second electrode, the area of the opposing-electrode region between the first electrode and to the second electrode is unchanged.