Conductive Yarn Pressure Sensor for Flexible Textiles
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Solution Overview
Problem
Existing pressure sensors are not flexible enough to be effectively applied to clothing or flexible items, and they lack the ability to sense the position and area of pressure applied.
Innovation Solution
A conductive yarn pressure sensor is developed, which includes a porous fiber layer with conductive yarns on either surface. These yarns are arranged in a grid pattern to intersect each other, allowing for pressure sensing through changes in resistance and enabling the detection of pressure position and area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pressure sensors are bonded onto a flat substrate or base member, then they can sense pressure through deformation, but they become rigid and cannot be effectively applied to clothing or flexible items
Solution Approach 1:
The patent replaces the rigid flat substrate with a flexible base member having a curved surface, and bonds the pressure sensing film to this flexible structure. This allows the sensor to conform to and move with flexible items like clothing while maintaining its pressure sensing capability through deformation detection.
Solution Approach 2:
The patent transitions from a two-dimensional flat substrate to a three-dimensional curved surface structure. The base member's curved surface allows the sensor to adapt to complex geometries of flexible items, adding spatial dimensionality that enables versatility while maintaining structural integrity through the curved configuration.
2Loss of information
If traditional pressure sensors are used, then they can sense pressure magnitude, but they cannot detect the position and area of pressure applied
Solution Approach 1:
The pressure sensing film is divided into multiple sensing regions or pixels that can independently detect pressure. By segmenting the sensing area, the system can determine not only the magnitude but also the position and distribution area of applied pressure, as each segment provides localized measurement data.
Solution Approach 2:
The pressure sensing film serves multiple functions simultaneously: it detects pressure magnitude, determines pressure position, and calculates pressure area. This multi-functionality is achieved through the integrated design where the same sensing structure provides all three measurement capabilities without requiring separate sensor systems.
3Measurement precision
If conductive yarns are arranged in a grid pattern to detect pressure position, then position and area sensing is enabled, but the manufacturing complexity increases
Solution Approach 1:
The patent employs a porous or mesh-like structure formed by the conductive yarns, which naturally creates the grid pattern needed for position detection. This porous configuration achieves precise position sensing while being more manufacturable, as the porous structure can be created through standard textile or fabric formation processes rather than requiring complex precise yarn placement.
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 conductive yarn pressure sensor is highly flexible, allowing it to be effectively applied to clothing and flexible items. It can accurately sense pressure, position, and area of pressure, enhancing its applicability across various fields.
Implementation Method 1
pressure sensing through changes in resistance
Data Source
AI summary
A conductive yarn pressure sensor is proposed. The pressure sensor may include a porous fiber layer having predetermined cavities formed therein. The pressure sensor may also include a first sensing electrode made of a first conductive yarn formed on one surface of the porous fiber layer, and a second sensing electrode made of a second conductive yarn formed on the other surface of the porous fiber layer. The first sensing electrode or the second sensing electrode may be provided so as to be in contact with each other in the cavities of the porous fiber layer due to external pressure. According to an embodiment, by having conductive yarn in flexible clothing or textile material, pressure can be sensed by effectively responding to deformation due to external pressure.