Tactile Sensor Layering for Flexible Capacitive and Resistive Detection
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Solution Overview
Problem
Existing tactile sensors are not robust, versatile, and easy to manufacture, lacking in flexibility and adaptability to various surfaces and applications.
Innovation Solution
A tactile sensor element composed of a substrate layer, electrode layers, spacer layer, measurement layer, and protective layer, utilizing electrically conductive and elastic materials with alternating electrode regions and a spacer structure for capacitive and resistive detection, allowing for flexible and adaptable tactile input recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional tactile sensor structures are used, then manufacturing simplicity is maintained, but robustness and versatility are reduced
Solution Approach 1:
The sensor is divided into distinct functional layers: substrate layer, electrode layers with alternating patterns, spacer layer, and measurement layer. Each layer performs a specific function, allowing the sensor to be robust and versatile while maintaining manufacturability through standardized layer-by-layer construction.
Solution Approach 2:
The sensor employs composite material structures combining electrically non-conductive substrate material, electrically conductive electrode material, electrically non-conductive spacer material, and electrically conductive elastic measurement material. This composite approach enhances both robustness and versatility while keeping the manufacturing process systematic.
2Adaptability or versatility
If flexible and stretchable materials are used, then adaptability to uneven surfaces is improved, but manufacturing complexity increases
Solution Approach 1:
The measurement layer uses electrically conductive elastic and stretchable material that can deform to adapt to uneven surfaces. The spacer layer geometry and material properties are optimized to maintain electrical isolation while allowing controlled deformation, enabling surface adaptability without excessive manufacturing complexity.
Solution Approach 2:
The sensor employs flexible thin film structures in the measurement layer and spacer layer that can conform to uneven surfaces. These flexible layers maintain their functional properties while adapting to various surface geometries, balancing manufacturability with surface adaptability.
3Adaptability or versatility
If alternating electrode regions are used, then capacitive and resistive sensing capability is improved, but device complexity increases
Solution Approach 1:
The electrode layers feature alternating patterns of conductive and non-conductive regions that create multiple sensing elements. This segmentation enables both capacitive and resistive sensing modes without requiring complex control circuits, as each alternating region forms an independent sensing unit.
Solution Approach 2:
The alternating electrode pattern serves multiple functions simultaneously: it creates capacitive sensing regions, resistive sensing regions, and maintains electrical isolation between different sensing elements. This multi-functionality enhances sensing capability while avoiding the need for separate complex sensing structures.
4Reliability
If spacer layer with individual sections is used, then tactile input detection reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The spacer layer is divided into individual sections positioned between alternating electrode regions. Each spacer section independently maintains electrical isolation and supports tactile input detection in its local region. This segmentation improves detection reliability by ensuring consistent electrical isolation across the entire sensor surface.
Solution Approach 2:
The spacer layer geometry and material properties are optimized to provide sufficient electrical isolation while maintaining compatibility with standard manufacturing tolerances. The spacer sections are designed with dimensions and positioning that balance detection reliability with manufacturability, avoiding excessive precision requirements.
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 sensor element provides robust and versatile tactile input detection with flexible material properties, enabling reliable capacitive and resistive sensing on uneven surfaces and varied applications.
Implementation Method 1
a measurement layer which is applied onto the spacer layer (advantageously in a closed manner over a large area) and consists of an electrically conductive elastic and stretchable material M4
Implementation Method 2
The sub-regions of the electrode layers ES1 and ES2 alternating along the direction R0 in the region B are each designed as projections
Data Source
AI summary
A tactile sensor element including: a substrate of non-conductive material; an electrode layer ES1 applied onto an upper face of the substrate layer; an electrode layer ES2 applied onto the upper face of the substrate layer, the electrode layers consisting of conductive material, arranged on the upper face in a spaced manner, and having respective shapes such that sub-regions of electrode layer ES1 and sub-regions of electrode layer ES2 alternate in a region on the upper face along a direction R0; a spacer layer applied onto the substrate layer with the applied electrode layers, the spacer layer consisting of spaced sections running in a direction R1 and consisting of a substantially non-conductive material or a perforated grating made of this material with grating axes running parallel to the upper face, in the region; and a measurement layer applied onto the spacer layer and consisting of conductive, elastic, and stretchable material.