Multilayer Reactance Sensor Structure for Higher Sensitivity
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Solution Overview
Problem
Existing multilayer structures for sensing applications face challenges such as large electrodes that are difficult to design with adjacent sensors, increased costs and assembly time, and sensitivity issues due to separate components that can become loose during injection molding, leading to complex manufacturability and interference problems.
Innovation Solution
An integrated multilayer structure comprising a molded or cast plastic layer with electrically insulating material and film layers on both sides, where the film layer on one side includes reactance sensing electronics and a physical feature to reduce the electrical distance between the sensing element and the sensing area, improving sensitivity while maintaining a long enough connection to the control circuitry to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If large electrodes are arranged on the surface or close to the surface of the device, then sensing area is increased, but device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The patent merges the electrode and the substrate into a single integrated structure. The conductive traces are printed directly onto the flexible substrate, eliminating the need for separate large electrodes mounted on the surface. This integration reduces device complexity while maintaining the sensing area, as the substrate itself becomes the sensing element.
Solution Approach 2:
The patent transitions from traditional planar PCB-based electrodes to a flexible substrate that can be conformally mounted on curved surfaces. This dimensional flexibility allows the sensing area to wrap around three-dimensional surfaces, increasing the effective sensing area without proportionally increasing device complexity.
2Adaptability or versatility
If separate components are used for sensing elements and substrate, then manufacturing flexibility is improved, but assembly time and costs increase
Solution Approach 1:
The sensing element and substrate are merged into a single printed structure. The conductive traces are directly printed onto the flexible substrate in the final assembly position, eliminating separate assembly steps for mounting electrodes or sensing elements. This reduces assembly time and costs while maintaining manufacturing flexibility through the printed electronics approach.
3Adaptability or versatility
If separate components are used for sensing elements and substrate, then design flexibility is improved, but reliability decreases due to loose connections during injection molding
Solution Approach 1:
The sensing element is permanently integrated into the substrate through the printing process, creating a mechanically robust single-piece structure. This eliminates loose connections that could occur during injection molding or assembly, significantly improving reliability while retaining design flexibility through the ability to print custom trace patterns on flexible substrates.
4Measurement precision
If sensing element is placed close to the sensing area, then sensing sensitivity is improved, but interference from control circuitry increases
Solution Approach 1:
The patent applies local quality by varying the trace width and geometry of the conductive paths in different regions. Near the sensing area, the traces are optimized for minimal interference, while further away they provide stable connections to control circuitry. This localized optimization allows the sensing element to be placed close to the sensing area for high sensitivity while managing interference through careful trace design.
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 solution enhances sensing sensitivity and reduces interference by locally reducing the electrical distance between the sensing element and the sensing area, while maintaining a stable connection to the control circuitry, thus improving the overall performance and manufacturability of the sensing structure.
Implementation Method 1
reactance sensing electronics for reactance, such as (projected) capacitance or inductance, sensing
Data Source
AI summary
An integrated multilayer structure for use in sensing applications and a method of manufacture are presented. The multilayer structure includes at least one molded or cast plastic layer and a film layer on both first and second sides of said plastic layer. The film layer on the first side of said plastic layer is provided with reactance sensing electronics. The sensing electronics includes at least one sensing element and an electrical connection for connecting the sensing element to an associated control circuitry. The film layer on the second side of the plastic layer has a sensing area superimposed with the sensing element of the sensing electronics. The electrical distance between the film layer on the second side of the plastic layer and the sensing element are locally reduced by a physical feature at the position of the sensing area of the film layer to improve the associated sensing sensitivity.