Pressure-Sensitive Element with Hollow Spherical Conductive Elastic Body
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Solution Overview
Problem
Conventional pressure-sensitive elements have limitations in expandability, measurement range, and structural simplicity, particularly when applied to free curved surfaces, and face issues with stress concentration and contact resistance during wire drawing, leading to reduced measurement accuracy.
Innovation Solution
A pressure-sensitive element design featuring elongated conductive elastic bodies and conductor wires with a dielectric, aligned in intersecting planes, and a connecting thread to sew the conductive elastic body and conductive cloth, enhancing capacitance change and pressure force measurement range while simplifying the structure and reducing stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lead-out wire and conductive adhesive are used to draw out electrical signals from the conductive elastic body, then electrical connection is achieved, but stress concentration and contact resistance occur at the interface, leading to peeling and reduced measurement accuracy
Solution Approach 1:
The patent changes the physical parameters of the conductive elastic body by incorporating a hollow spherical structure with air cavity. This structural parameter change allows the material to deform elastically under stress without concentrating stress at rigid interfaces, thereby maintaining both electrical connection reliability and measurement precision simultaneously
Solution Approach 2:
The patent creates a composite structure combining conductive elastic body with hollow spherical geometry. This composite design integrates the flexibility and elasticity of the elastic material with the stress-distributing geometry of the hollow sphere, eliminating the peeling issue at wire-adhesive interfaces while maintaining electrical conductivity and measurement accuracy
2Adaptability or versatility
If conventional pressure-sensitive element structures are used, then basic pressure detection is achieved, but expandability and measurement range are insufficient when applied to free curved surfaces
Solution Approach 1:
The patent implements a dynamic structure where the conductive elastic body with hollow spherical geometry can deform and expand adaptively. This dynamic capability allows the sensor to conform to free curved surfaces and expand its measurement range without being constrained by rigid conventional structures
Solution Approach 2:
The hollow spherical structure enables parameter changes in volume and shape under applied pressure, allowing the sensor to expand and adapt to various curved surfaces. This parameter variability directly enhances both expandability and measurement range simultaneously
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 solution provides a pressure-sensitive element with improved expandability, a wider measurement range, and increased accuracy by stabilizing capacitance changes and reducing noise interference, effectively addressing the limitations of conventional designs.
Implementation Method 1
when pressure force is applied between the first electrode and the second electrode, a contact area of the first electrode and the dielectric material is expanded based on the elasticity of the conductive elastic body as the first electrode
Implementation Method 2
As a result, capacitance C [pF] between the first electrode and the second electrode changes, and the pressure force is measured based on this change
Data Source
AI summary
Provided is a pressure-sensitive element having more sufficient expandability, a relatively wide measurement range of pressure force, and a relatively simple structure, and an electronic device using the pressure-sensitive element. The pressure-sensitive element includes a plurality of first electrodes being elongated in first direction, arranged in a first plane, and including a conductive elastic body, a plurality of second electrodes being elongated in second direction intersecting the first direction, arranged in a second plane facing the first plane, and including a conductor wire, and a plurality of dielectrics covering a surface of the plurality of second electrodes. The plurality of second electrodes have bent parts K arranged periodically, and capacitance at intersections of the plurality of first electrodes and the plurality of second electrodes changes in accordance with pressure force applied between the plurality of first electrodes and the plurality of second electrodes.