Integrated Reference Resistor Layout for Pressure Sensing
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Solution Overview
Problem
Existing force/pressure sensors require external components to measure changes in resistivity, which increases cost and makes them susceptible to environmental conditions like temperature, affecting measurement accuracy.
Innovation Solution
Incorporating a reference resistor into the electrode structure using the same material as the sensor electrodes, eliminating the need for external resistors and providing inherent compensation for temperature variations by using a quantum tunnelling compound or similar variable resistive material.
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 combines the reference resistor with the sensor electrode to form a single integrated structure. The reference resistor is formed using the same conductive material and fabrication process as the sensor electrode, eliminating the need for separate external resistor components. This merging reduces device complexity while maintaining the voltage divider measurement capability.
2Measurement precision
If external components are used to measure changes in resistivity, then measurement capability is achieved, but manufacturing cost increases
Solution Approach 1:
The reference resistor and sensor electrode are manufactured as a single integrated structure using the same conductive material and fabrication process. This eliminates the need for separate external resistor components and reduces assembly steps, thereby lowering manufacturing cost while maintaining measurement capability.
Solution Approach 2:
The reference resistor is formed using the same conductive material as the sensor electrode, ensuring homogeneous material properties throughout the structure. This homogeneity simplifies manufacturing by using a single material system and reduces costs associated with multiple material handling and assembly processes.
3Measurement precision
If external components are used for measurement, then measurement function is provided, but susceptibility to environmental conditions increases
Solution Approach 1:
By integrating the reference resistor with the sensor electrode in a single structure made of the same material, the patent creates a measurement system that is inherently compensated for environmental effects. Both the sensor and reference elements experience identical environmental conditions, allowing the voltage divider ratio to remain stable despite temperature or humidity changes.
Solution Approach 2:
The use of homogeneous conductive material for both the sensor electrode and reference resistor ensures that both elements respond identically to environmental changes. This material homogeneity provides inherent environmental compensation, reducing susceptibility to harmful environmental factors while maintaining the measurement function.
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 force/pressure over a wide range of temperatures without external compensation, reducing construction costs and maintaining measurement accuracy.
Implementation Method 1
The second electrode includes a first extended portion to establish a first additional resistance... using a quantum tunnelling compound or similar variable resistive material
Data Source
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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.