Conductive Yarn with Insulating Fiber Core for Capacitive Touch Sensors
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Solution Overview
Problem
Conductive yarns used in fabric items often have an unacceptable appearance due to visible metal wires, which can be a concern for applications requiring both conductivity and aesthetics.
Innovation Solution
Conductive yarns are formed by spinning insulating fibers around metal wires, making the conductive fibers hidden from view and visually matching the appearance of insulating fibers, allowing for the integration of conductive strands into woven or knitted fabrics without altering their appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive strands are formed from intertwined strands of bare wire, then electrical conductivity is achieved, but appearance becomes unacceptable due to visible metal wires
Solution Approach 1:
The patent applies the nesting principle by placing conductive metal wires inside insulating fibers, creating a core-shell structure where the insulating fiber acts as a container for the conductive wire. This nested configuration allows the conductive element to be hidden within the insulating material, achieving both electrical conductivity and acceptable appearance simultaneously.
Solution Approach 2:
The insulating fiber serves as an intermediary element between the conductive wire and the external environment. It mediates the visual appearance by concealing the metal wire while allowing the conductive function to persist through the insulating fiber's structure. This intermediary approach resolves the contradiction by separating the conductive and aesthetic functions.
2Adaptability or versatility
If conductive yarn is used in fabric items, then conductivity for signals and sensors is achieved, but aesthetic appeal deteriorates due to visible conductive elements
Solution Approach 1:
The patent applies local quality by making different parts of the yarn have different properties: the core (metal wire) provides conductivity while the outer shell (insulating fiber) provides aesthetic appearance. This localized differentiation allows the yarn to simultaneously satisfy both functional and aesthetic requirements without compromising either.
Solution Approach 2:
The conductive yarn is formed as a composite material combining metal wires with insulating fibers. This composite structure integrates materials with complementary properties - the metal provides electrical conductivity while the insulating fiber provides visual neutrality and fabric aesthetics. The composite approach enables the yarn to function as both conductive element and aesthetic fabric component.
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 enables fabric items to maintain a desirable appearance while functioning as capacitive touch sensors or signal carriers, enhancing user experience and aesthetic appeal by concealing conductive elements within insulating fibers.
Implementation Method 1
The insulating fibers in the conductive yarn may be spun around the metal wires and may hide the metal wires from view
Data Source
AI summary
A fabric-based item may have fabric with conductive strands of material. The conductive strands of material may include conductive yarn formed from insulating fibers and conductive fibers. The conductive fibers may be metal wires. The insulating fibers in the conductive yarn may hide the conductive fibers from view. The fabric may be woven fabric or other fabric with intertwined strands of material. The woven fabric may include conductive and insulating warp yarns and conductive and insulating weft yarns. Conductive yarn may be coupled to capacitive touch sensor circuitry and may form a capacitive touch sensor grid or other capacitive touch sensor electrode structures. Conductive yarn may also be soldered or otherwise coupled to electrical components.