Stitched Stretch Sensor Using Conductive Thread Geometry
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Solution Overview
Problem
Traditional wearable sensing technologies face challenges in balancing sensor accuracy and user comfort, as they often rely on rigid, bulky components that detract from wearing comfort, particularly in non-critical sensing activities where compromise on comfort is unrealistic.
Innovation Solution
The development of stitched sensors, which integrate conductive threads into textile stitch geometries, allowing electrical properties to change based on stretching, bending, or relaxation of the textile, enabling comfortable and accurate sensing without compromising user comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electronic components and sensors are used for wearable sensing, then sensing accuracy and precision are improved, but wearing comfort deteriorates due to rigid, bulky, and impermeable components
Solution Approach 1:
The patent replaces traditional rigid electronic sensors with a textile-based sensing system that uses conductive threads stitched into the fabric. The sensing mechanism transitions from electronic components to electrical property changes (resistance, capacitance, inductance) of the conductive thread structure itself, eliminating the need for bulky electronic sensors while maintaining sensing capability
Solution Approach 2:
The patent uses conductive threads integrated into flexible textile fabric, creating a thin, flexible sensing layer that conforms to the body. This replaces rigid sensor housings and electronic components with a soft, wearable textile structure that maintains sensing functionality while ensuring comfort
Solution Approach 3:
The patent combines conductive threads with non-conductive textile materials to create a composite sensing fabric. The conductive thread provides sensing functionality while the textile substrate provides flexibility, comfort, and wearability, achieving both accuracy and comfort through material composition
2Measurement precision
If conductive threads are stitched into textile in specific geometries to enable sensing, then sensing accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the sensing function into discrete stitch segments along the conductive thread. Each stitch or group of stitches forms a sensing element with specific electrical properties, allowing the complex sensing function to be broken down into simple, repeatable stitching patterns that can be manufactured using standard techniques
Solution Approach 2:
The patent achieves different sensing characteristics by varying parameters of the stitch geometry such as stitch length, stitch type, thread tension, and spacing, rather than designing completely different complex structures. This allows tuning of sensing properties through parameter adjustment of a basic stitching pattern
3Adaptability or versatility
If conductive threads are integrated into textile to enable stretch and bend sensing, then sensing capability is improved, but electrical property stability may deteriorate due to thread movement and contact changes
Solution Approach 1:
The patent designs the stitch geometry to dynamically adapt to textile deformation. The conductive thread is stitched in patterns that allow controlled movement and contact changes during stretch and bend, transforming what could be instability into a functional response that accurately tracks deformation while maintaining reliable electrical signals
Solution Approach 2:
The changing electrical properties (resistance, capacitance, inductance) of the conductive thread during deformation serve as feedback signals that provide information about the textile's state. By monitoring these electrical property changes, the system maintains stable and accurate sensing of stretch and bend through the inherent feedback mechanism of the conductive thread's electrical response
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
Stitched sensors provide a comfortable and accurate means of sensing textile changes, such as stretching and bending, while minimizing disruptions to existing manufacturing processes and user experience, making them suitable for wearable applications.
Implementation Method 1
the stitch geometry is configured such that an electrical property (e.g., resistance) of the stitched stretch sensor changes based on stretching and relaxation of the textile
Implementation Method 2
the stitch geometry of the sensor may be configured such that an electrical property of the stitched bend sensor changes based on bending and unbending of the textile
Data Source
AI summary
A stitched sensor including a plurality of threads stitched to a textile in a stitch geometry is described. The plurality of threads includes a conductive thread, and the stitch geometry is configured such that an electrical property of the stitched sensor changes based on at least one of stretching, relaxation, or bending of the textile. Methods for forming a stitched sensor are also described.