Direct Wire Attachment to Adhesive Layer for Flexible Circuit Fabrication
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Solution Overview
Problem
The high cost and environmental hazards associated with print-and-etch processes used in forming wiring patterns on flexible substrates for RFID and LED applications make these technologies prohibitively expensive and environmentally unfriendly.
Innovation Solution
A method of attaching fine-gauge wire directly to a pressure-sensitive adhesive layer using a robotically controlled write head with a payout mechanism, maintaining slack in the wire and guiding it through a small gap to adhere to the adhesive layer, eliminating the need for costly chemicals and hazardous waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If print-and-etch processes are used to create wiring patterns on flexible substrates, then wiring patterns can be formed for RFID and LED applications, but the process becomes prohibitively expensive and generates hazardous waste
Solution Approach 1:
The patent extracts the wiring pattern creation process from the traditional print-and-etch method and replaces it with direct wire attachment to the substrate. This eliminates the need for costly chemicals and hazardous waste generation while maintaining the ability to create precise wiring patterns for electronic applications
Solution Approach 2:
The patent uses individual wire segments that can be directly attached to the substrate, replacing the expensive and environmentally harmful print-and-etch process. The wire itself becomes the permanent wiring pattern without requiring additional chemical processing steps
2Ease of manufacture
If print-and-etch processes are used to form wiring patterns, then wiring can be created on flexible substrates, but the process requires expensive chemicals and complex manufacturing steps
Solution Approach 1:
The patent removes the complex print-and-etch process entirely and replaces it with a straightforward wire attachment method. This simplifies manufacturing by eliminating multiple process steps including chemical application, drying, and etching, while achieving the same functional result
Solution Approach 2:
Instead of creating wiring patterns by depositing and etching conductive material on the substrate, the patent inverts the approach by directly attaching individual wire segments to the substrate. This reverses the traditional manufacturing sequence and achieves simpler process execution
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
This approach allows for precise and cost-effective creation of fine-gauge wiring patterns on flexible substrates, reducing environmental impact and enabling durable, lightweight, and thin-profile RF and LED applications without the need for expensive chemicals or etching processes.
Implementation Method 1
a layer of adhesive on a substrate. The substrate may have a top surface and the layer of adhesive may have a top surface and a bottom surface attached to the substrate
Data Source
AI summary
A method of attaching wire to an exposed surface of an adhesive layer includes guiding wire from a wire source through a payout head and through a foot of a write head. A first portion of the wire extends from the foot toward the adhesive layer. The write head is positioned such that a gap between the foot and the exposed surface of the adhesive layer is greater than a diameter of the wire. The write head is moved in a motion parallel to the adhesive layer, and the first portion of the wire adheres to the adhesive layer. Wire is pulled from the wire source by the payout head as the write head is moving in order to maintain slack in a second portion of the wire between the payout head and the write head as the wire is attached to the exposed surface of the adhesive layer.