Laser-Ablated Dielectric Sheet for Tactile Sensor Manufacturing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tactile sensors for robotic grippers are complex to manufacture and maintain, requiring specialized materials and structures, and are not suitable for mass production due to time-consuming fabrication processes, limiting their ability to detect various object modalities like vibration and shear loading effectively.
Innovation Solution
A method of manufacturing a compressible dielectric or weakly conductive sheet using laser ablation to create a sheet with uniform cavities, which is positioned between a conductive membrane and a conductive plate, allowing for enhanced sensitivity and ease of production, enabling the detection of localized pressure and dynamic events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If specialized materials and complex structures are used in tactile sensors, then sensing capability is improved, but manufacturing complexity and difficulty increase
Solution Approach 1:
The patent employs a porous dielectric layer with controlled porosity (30-70%) created through foam generation. This porous structure enhances the sensor's sensitivity and sensing capability by increasing the effective surface area and improving mechanical compliance, while the foam-based material itself simplifies the overall structure compared to traditional multi-layer complex constructions. The porous dielectric layer is formed by incorporating a foaming agent into the dielectric material and curing it to create uniform foam structures with controlled cell sizes and distributions.
Solution Approach 2:
The patent utilizes composite material structures combining dielectric layers with conductive layers (such as ITO or conductive polymers) to achieve both mechanical functionality and electrical sensing. The composite structure integrates the porous dielectric foam with conductive materials to create a multi-functional layer that provides both structural compliance and electrical signal generation, thereby improving sensing capability while maintaining manufacturing feasibility through standardized composite material processing techniques.
2Manufacturing precision
If traditional fabrication processes are used, then manufacturing precision can be achieved, but production time increases significantly
Solution Approach 1:
The patent incorporates preliminary action by pre-forming the porous dielectric layer with integrated foam structures before final sensor assembly. The foaming agent is mixed into the dielectric material beforehand, and the foam structure is generated during the curing process itself, eliminating the need for subsequent complex post-processing steps to create the porous structure. This preliminary formation of the porous structure maintains manufacturing precision while significantly reducing overall production time.
Solution Approach 2:
The patent applies parameter changes by controlling the curing conditions (temperature, time, pressure) to directly influence the foam structure formation. By adjusting curing parameters such as temperature gradients and pressure conditions, the patent achieves precise control over pore size, porosity distribution, and foam density, thereby maintaining manufacturing precision. These parameter optimizations enable faster curing cycles without sacrificing structural quality, thus improving production speed.
3Measurement precision
If complex sensor structures are implemented, then detection accuracy is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent segments the sensor structure into distinct functional layers: a porous dielectric layer for mechanical compliance and signal modulation, conductive layers for electrical signal generation, and protective layers for durability. Each layer is optimized independently for its specific function, allowing for specialized processing of each segment while simplifying the overall manufacturing approach. The segmented structure enables detection accuracy through layered functionality while improving ease of manufacture by allowing independent optimization and assembly of each layer.
Solution Approach 2:
The porous dielectric layer serves multiple functions simultaneously: it provides mechanical compliance for accurate pressure sensing, modulates electrical signals through its porous structure, and acts as a structural support framework. This multi-functionality reduces the need for additional separate components, thereby improving detection accuracy through integrated functionality while significantly enhancing ease of manufacture by consolidating multiple roles into a single material layer.
4Reliability
If specialized technician intervention is required, then sensor performance is maintained, but production efficiency decreases
Solution Approach 1:
The patent implements self-service by designing the dielectric material and foam structure to self-align and self-assemble during the curing process. The foam structures naturally form uniform patterns through controlled expansion, and the layered structure self-bonds during curing without requiring manual intervention for alignment or positioning. This self-service characteristic maintains sensor performance through consistent structural formation while dramatically improving production efficiency by eliminating the need for specialized technician intervention during assembly.
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 laser-ablated dielectric sheet provides improved compressibility and sensitivity, facilitating the detection of pressures ranging from 0 to 50 Newtons with high accuracy, and can be produced quickly, making it suitable for mass production and integration into robotic systems.
Implementation Method 1
positioning a flexible sheet made from a dielectric material or a weakly conductive material in a laser ablation machine... ablating the flexible sheet with the ablation machine according to the adjusted parameters
Implementation Method 2
The sensor being adapted to measure either a localized change in capacitance or conductivity corresponding to an applied pressure on the compressible sheet
Implementation Method 3
measure either a localized change in capacitance or conductivity corresponding to an applied pressure
Data Source
AI summary
A capacitive or resistive tactile sensor having a conductive membrane, a flexible dielectric or weakly conductive sheet and a substrate having electrodes, and a method of manufacturing thereof. The flexible sheet has a first surface and an opposite second surface, the first surface and the second surface are uniformly distanced when at rest. The first surface is adapted to contact one of the conductive membrane or the substrate. The second surface is adapted to contact another one of the conductive membrane or the substrate. The body defines between the first and second surfaces, at a predetermined region, a plurality of laser ablated uniform cavities that are evenly distributed and operatively identical in order to provide a known compression index at the predetermined region of the flexible sheet. The substrate has uniformly distributed static pressure sensing electrodes and at least one uniformly spread dynamic pressure sensing electrode, which is located between the static pressure sensing electrodes, and is used for measuring a voltage or a current variation with the conductive membrane according to the deformation of the flexible sheet.