Multilayer Sensing Structure With Reduced Electrical Distance
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Solution Overview
Problem
Existing multilayer structures for sensing applications face challenges such as large electrodes taking up space, increased costs, assembly complexity, and sensitivity issues due to separate components, which complicate manufacturability and lead to loose components during injection molding.
Innovation Solution
A multilayer structure with a molded or cast plastic layer of electrically insulating material, featuring a first and second film layer with reactance sensing electronics, where the electrical distance between the film layer and sensing element is reduced by a physical feature like a recess or conductive element molded into the plastic layer, improving sensing sensitivity while maintaining a long electrical connection to the control circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If large electrodes are arranged on the surface or close to the surface of the device, then sensing capability is achieved, but device area is reduced and assembly complexity increases
Solution Approach 1:
The patent transitions from planar 2D electrode arrangements on the surface to a 3D vertical configuration where electrodes are embedded within multilayer structures. This dimensional change allows sensing functionality to be achieved without occupying additional surface area, as electrodes are positioned at different depths and layers rather than spreading out on the surface.
Solution Approach 2:
The patent implements nested electrode structures where multiple electrodes are positioned within nested layers of the device. Inner electrodes are surrounded by outer electrodes at different depths, creating a compact nested arrangement that provides comprehensive sensing coverage while minimizing the overall device footprint.
2Measurement precision
If separate components are used for sensing elements and control circuitry, then sensing functionality is achieved, but manufacturing cost and assembly time increase
Solution Approach 1:
The patent merges sensing elements, control circuitry, and electrode structures into a single integrated multilayer component. The control circuitry is embedded within the same layered structure as the sensing electrodes, eliminating the need for separate components and reducing assembly steps to a single manufacturing process.
Solution Approach 2:
The multilayer structure serves multiple functions simultaneously: it provides mechanical support, electrical insulation, sensing capability, and signal processing. Each layer is designed to perform multiple roles, such as providing both structural integrity and electrical isolation, thereby reducing the total number of components needed.
3Measurement precision
If separate components are used for sensing elements and control circuitry, then sensing functionality is achieved, but device complexity and manufacturability worsen
Solution Approach 1:
The patent segments the sensing device into distinct functional layers, each with a specific role. This segmentation into manageable layers simplifies the manufacturing process by allowing each layer to be fabricated and positioned independently, then integrated into the final structure through a standardized multilayer assembly process.
Solution Approach 2:
The patent combines multiple functional elements into an integrated multilayer structure where sensing electrodes, control circuitry, insulation layers, and support structures are merged into a single cohesive component. This integration reduces the number of separate parts and simplifies manufacturing while maintaining sensing functionality.
4Ease of manufacture
If components are subject to pressures in injection molding process, then manufacturing is achieved, but components become loose and reliability decreases
Solution Approach 1:
The patent employs composite multilayer materials with varying mechanical and electrical properties optimized for injection molding. The composite structure includes layers with different durometers and thermal expansion coefficients that work together to absorb molding pressures while maintaining component stability and preventing loosening during the manufacturing process.
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
Enhances sensing sensitivity by reducing the electrical distance between the sensing element and area, while maintaining a sufficient connection distance to reduce interference, thus improving the performance and manufacturability of touch, proximity, and force sensing applications.
Implementation Method 1
reactance sensing electronics for reactance, such as (projected) capacitance or inductance, sensing of one or more selected target quantities and/or qualities
Implementation Method 2
reactance sensing electronics for reactance, such as (projected) capacitance or inductance, sensing of one or more selected target quantities and/or qualities
Implementation Method 3
the electrical distance between the film layer on the second side of said plastic layer and the sensing element is locally reduced by at least one physical feature at the position of the sensing area of the second film layer to improve the associated sensing sensitivity
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
An integrated multilayer structure for use in sensing applications and a method of manufacture are presented. The multilayer structure comprises 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 comprises 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 said plastic layer having a sensing area superimposed with the sensing element of the sensing electronics. The electrical distance between the film layer on the second side of said plastic layer and the sensing element being locally reduced by a physical feature at the position of the sensing area of the film layer to improve the associated sensing sensitivity.