Capacitive Gap Force Sensor Multi-Layer Fill
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Solution Overview
Problem
Capacitive gap force sensors face challenges in reducing cost, size, complexity, and manufacturing time while maintaining sensitivity and uniformity across different applications and installations.
Innovation Solution
The capacitive gap force sensor design incorporates a multi-layer fill with a layer of conductive material having a lower initial compression resistance than a layer of dielectric material, allowing the conductive material to compress more and absorb installation and force-related compression, maintaining a consistent effective capacitive sensing gap and enhancing sensitivity and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single-layer dielectric material is used in the capacitive gap, then the sensor structure is simple, but the force signal response uniformity and sensitivity are insufficient
Solution Approach 1:
The dielectric material is divided into multiple layers with different compression resistance values. The first dielectric layer has a first compression resistance and the second dielectric layer has a second compression resistance that is greater than the first. This segmentation allows each layer to contribute differently to the overall capacitance change, improving force signal response uniformity across different application scenarios.
Solution Approach 2:
Different regions of the sensor (represented by different dielectric layers) are given different local properties (compression resistance values). The first dielectric layer with lower compression resistance allows for greater compression under force, while the second dielectric layer with higher compression resistance provides structural support and limits maximum compression. This local differentiation optimizes the capacitance response characteristics.
2Reliability
If the compression resistance of dielectric layers is increased to maintain gap stability, then the sensor becomes more robust, but the sensitivity to applied force decreases
Solution Approach 1:
The sensor structure transitions from a static single-layer design to a dynamic multi-layer system where each layer responds differently to applied force. The first dielectric layer with lower compression resistance deforms more readily under force, providing sensitive response, while the second dielectric layer with higher compression resistance maintains structural integrity and prevents complete gap collapse, ensuring reliability.
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
This design results in higher and more uniform force signal responses across different applications, improving sensitivity and reducing variability due to structural modifications that adjust compression resistance, ensuring consistent performance.
Implementation Method 1
The first layer may be configured to compress or deform and alter the effective capacitive sensing gap when a force is received on the force input surface
Implementation Method 2
The first layer may be configured to compress or deform and alter the effective capacitive sensing gap when a force is received on the force input surface
Implementation Method 3
Capacitive gap force sensors face challenges in reducing cost, size, complexity, and manufacturing time while maintaining sensitivity and uniformity across different applications and installations
Data Source
AI summary
A capacitive gap force sensor includes a first electrode, a second electrode spaced apart from the first electrode, a first layer of dielectric material positioned between the first electrode and the second electrode, and a second layer of conductive material positioned between the first layer and the second electrode. The first layer has a first compression resistance less than a second compression resistance of the second layer. An effective capacitive sensing gap is defined between the first electrode and the second layer. The first layer is configured to compress or deform and alter the effective capacitive sensing gap when a force is received at the first electrode or the second electrode.