Force Sensing Device With Segmented Protrusion Array
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Solution Overview
Problem
Conventional force sensing devices have a limited dynamic range of force sensitivity in real-world applications compared to laboratory conditions, with a non-smooth increase in contact area with increasing force, leading to reduced sensitivity.
Innovation Solution
A force sensing device with a pressure sensitive active layer and conductive layers, where a force distribution structure extends the applied force across the active layer, expanding the contact area between the conductive layers, enhancing the dynamic range of force sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional force sensing device structure is used, then the device is simple in construction, but the dynamic range of force sensitivity is limited in real-world applications
Solution Approach 1:
The force distribution structure is segmented into multiple protrusions arranged in an array, where each protrusion independently contacts the active layer. This segmentation allows the structure to distribute force across multiple contact points, extending the dynamic range of force sensitivity while maintaining a relatively simple overall device architecture.
Solution Approach 2:
The invention transitions from a planar contact interface to a three-dimensional protrusion array structure. By adding vertical dimensionality with protrusions of varying heights, the device achieves enhanced force sensitivity across a broader dynamic range without significantly increasing lateral device footprint or overall complexity.
2Measurement precision
If force is applied to a conventional force sensing device, then contact area increases with force, but the increase is non-smooth leading to reduced sensitivity
Solution Approach 1:
The protrusions are designed with varying heights and/or contact areas, creating local quality variations across the force distribution structure. This allows different regions to engage at different force levels, producing a smooth, progressive increase in total contact area as force increases, thereby enhancing measurement sensitivity across the entire dynamic range.
Solution Approach 2:
The force distribution structure dynamically adapts its contact configuration with applied force. As force increases, progressively more protrusions make contact or existing contacts expand, creating a dynamic, multi-stage contact progression that ensures smooth sensitivity response throughout the measurement range.
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 force distribution structure within the force sensing device ensures a smooth and gradual increase in contact area with applied force, improving sensitivity and dynamic range, allowing for more accurate and sensitive force measurements.
Implementation Method 1
a third, active pressure sensitive layer, which is responsive to mechanical interactions such as a force or pressure applied
Data Source
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AI summary
A force sensing device (101) comprises a first conductive layer (102) and a second conductive layer (103) and a pressure sensitive active layer (104) responsive to a mechanical interaction. A force distribution structure (203) is positioned between the first and second conductive layers and extends between a first end and a second end of the first conductive layer. The force distribution structure is configured to expand the contact area between the pressure sensitive active layer and the first conductive layer in response to a force being applied to the force sensing device.