Pressure Sensor Third Electrode Volume Resistance Linearity
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Solution Overview
Problem
Existing pressure sensors do not exhibit a linear change in output value with respect to changes in applied load due to high volume resistance values in the pressure-sensitive electroconductive layer, affecting their linearity.
Innovation Solution
A pressure sensor configuration where a third electrode covered by a pressure-sensitive electroconductive layer is formed on the second sheet member, allowing current to flow through a narrower range, thereby reducing volume resistance and improving linearity by using a voltage between first and second electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only the pressure-sensitive electroconductive layer is formed on the second sheet member without a third electrode, then the device structure is simpler, but the volume resistance value increases and linearity deteriorates
Solution Approach 1:
The third electrode acts as an intermediary conductive layer between the second electrode and the pressure-sensitive electroconductive layer. This intermediary structure provides a dedicated current path that reduces the effective resistance and improves linearity without requiring fundamental changes to the overall device architecture.
2Device complexity
If the pressure-sensitive electroconductive layer has a wide current flow range, then the device structure is simpler, but the volume resistance value increases adversely affecting linearity
Solution Approach 1:
The third electrode is positioned specifically at the center of the second sheet member, creating a localized current path. This local quality approach concentrates the current flow through a specific region of the pressure-sensitive electroconductive layer, reducing the effective volume resistance in the measurement path while maintaining overall structural simplicity.
3Measurement precision
If a third electrode is added to the second sheet member covered by the pressure-sensitive electroconductive layer, then the linearity improves due to reduced volume resistance, but the device complexity increases
Solution Approach 1:
The third electrode is positioned in the thickness direction of the second sheet member, utilizing the z-dimension to create a new current path. This dimensional approach allows the third electrode to contact the pressure-sensitive electroconductive layer from the opposite side, effectively reducing volume resistance without increasing the planar footprint or overall device complexity.
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
The pressure sensor achieves improved linearity in output value changes with respect to load, enhancing detection accuracy and productivity by reducing volume resistance through the specific electrode configuration.
Implementation Method 1
a pressure-sensitive electroconductive layer is formed on the second sheet member
Data Source
AI summary
This pressure sensor is configured to detect pressure. The pressure sensor comprises a first sheet member and a second sheet member. The second sheet member is disposed so as to overlie the first sheet member. First and second electrodes are formed on the first sheet member. A third electrode which is covered by a pressure-sensitive electroconductive layer is formed on the second sheet member. When the pressure sensor is being used, a voltage is applied between the first and second electrodes. Regardless of whether the pressure sensor is being used, the first and second electrodes are each in contact with the pressure-sensitive electroconductive layer.