Piezoelectric Touch Sensor With Silica Gel Protrusions
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Solution Overview
Problem
Current artificial limbs with tactile sensors, such as piezoelectric, capacitive, and resistive sensors, struggle to recognize small pressures, limiting their tactile sensing capabilities.
Innovation Solution
A touch sensor design featuring a substrate with a piezoelectric layer, a first and second electrode layer, and a flexible touch layer with protrusions made of silica gel, allowing for enhanced sensitivity through non-planar contact and precise deformation measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional piezoelectric, capacitive, or resistive sensors are used in artificial limbs, then tactile sensing capability is provided, but small pressure recognition is insufficient
Solution Approach 1:
The touch layer is divided into multiple protrusions instead of a flat surface, creating segmented contact points that concentrate force and enhance sensitivity to small pressures while maintaining reliable touch recognition
Solution Approach 2:
The protrusions have curved surfaces that concentrate applied pressure onto smaller contact areas with the piezoelectric layer, enhancing the sensor's ability to detect small pressures while maintaining accurate touch recognition
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 touch sensor improves tactile sensitivity by recognizing minute deformations and pressure changes, enabling more accurate detection of touch events.
Implementation Method 1
a piezoelectric layer 13 formed on the substrate 11
Implementation Method 2
a flexible touch layer with protrusions made of silica gel, allowing for enhanced sensitivity through non-planar contact and precise deformation measurement
Data Source
AI summary
A touch sensor with enhanced and small-scale sensitivity includes a substrate, a piezoelectric layer on the substrate, a first electrode layer between the substrate and the piezoelectric layer, a second electrode layer on the piezoelectric layer, and an outer touch layer. The touch layer is made of flexible and deformable material. The touch layer includes a base layer covering the second electrode layer and finely-shaped protrusions protruding from a surface of the base layer away from the piezoelectric layer. The base layer and the protrusions are integrally formed. The disclosure also provides a method for making such touch sensor.