Pressure Sensor Electrode Layout With Integrated Reference Resistance
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Solution Overview
Problem
Existing force/pressure sensors require external components to measure changes in resistivity, which increases costs and makes them susceptible to environmental variations like temperature.
Innovation Solution
Incorporating a first extended portion in one of the electrodes to establish a reference resistance within the sensor structure, eliminating the need for external resistors and allowing for internal compensation of variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external components are used to measure changes in resistivity, then measurement capability is achieved, but device complexity and cost increase
Solution Approach 1:
The patent merges the reference resistance function into the electrode structure itself by adding an extended portion to the second electrode. This integration eliminates the need for separate external reference resistance components, thereby reducing device complexity while maintaining the capability to measure resistivity changes through voltage division between the sensor portion and the extended portion.
Solution Approach 2:
The extended portion of the second electrode serves multiple functions: it acts as both a conductive electrode extension and an integrated reference resistance element. This multi-functionality reduces the total component count and simplifies the overall device structure while preserving measurement capabilities.
2Measurement precision
If external components are used to measure changes in resistivity, then measurement capability is achieved, but manufacturing cost increases
Solution Approach 1:
By combining the reference resistance function into the electrode's extended portion, the patent eliminates the need to source, purchase, and assemble separate external resistance components. This integration reduces bill of materials costs and simplifies manufacturing processes, making the sensor more cost-effective to produce while maintaining measurement functionality.
3Measurement precision
If external components are used for measurement, then measurement capability is achieved, but susceptibility to environmental variations increases
Solution Approach 1:
The integration of the reference resistance into the electrode structure ensures that both the sensor portion and reference portion experience identical environmental conditions (temperature, humidity, mechanical stress). Since they are made from the same conductive material and located in the same physical environment, environmental variations affect both portions equally, allowing the voltage division ratio to remain stable and measurements to remain accurate.
Solution Approach 2:
The patent uses the same conductive material for both the sensor portion and the extended reference portion of the electrode. This homogeneity ensures that both portions have identical temperature coefficients and respond equally to environmental variations, eliminating differential drift and improving measurement reliability under changing environmental conditions.
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
Enables accurate measurement of physical attributes like force/pressure without external resistors, reducing costs and maintaining measurement accuracy across varying environmental conditions.
Implementation Method 1
said second electrode includes a first extended portion to establish a first additional resistance not cooperating with said active film
Implementation Method 2
force/pressure sensors that include tracks for defining electrodes having sensor portions and an active film cooperating with the sensor portions
Data Source
AI summary
An apparatus for sensing a physical attribute is shown, that includes a first track (511) defining a first electrode on a substrate (512), a second track (513) defining a second electrode on said substrate and an active film (514) in cooperation with a first sensor portion (516) of the first electrode and a second sensor portion (517) of the second electrode. The second electrode includes a first extended portion (517) to establish a first additional resistance not cooperating with the active film.