Flexible Circuit Trace Assembly Using Selective Adhesion Foil
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Solution Overview
Problem
Current methods for fabricating flexible printed circuits require expensive, complex equipment, skilled experts, and hazardous consumables, and power sources can pose choking or electrical hazards.
Innovation Solution
A flexible circuit kit including a carrier-backed foil with a metallized layer and a selectively adherable adhesive, allowing for the assembly of flexible circuits using simple equipment and non-toxic materials, and a power source design with integrated electrodes and a dielectric layer to prevent dislodgment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithography process is used to fabricate flexible printed circuits, then circuit trace conductivity and durability are improved, but substrate selection is limited due to high temperatures and corrosive acids
Solution Approach 1:
The patent extracts the circuit trace formation process from the conventional lithography sequence by using screen printing to directly deposit conductive ink patterns without requiring photoresist coating, UV exposure, or chemical etching steps. This separates the circuit formation function from the substrate preparation constraints, allowing use of temperature-sensitive substrates like paper and fabric.
Solution Approach 2:
The patent replaces expensive, hazardous lithography chemicals (photoresists, etchants, solvents) with inexpensive, non-toxic conductive inks that can be applied through simple screen printing. The conductive ink serves as a disposable material that can be directly deposited and cured without requiring complex chemical processing steps.
2Adaptability or versatility
If screen printing or additive manufacturing is used to fabricate flexible printed circuits, then substrate selection is improved, but circuit trace conductivity and durability deteriorate
Solution Approach 1:
The patent changes the physical and chemical parameters of the conductive ink formulation to achieve optimal conductivity and adhesion. The conductive ink contains metal particles suspended in a vehicle that can be adjusted for viscosity, particle size, and composition. After screen printing, the ink is cured through heating or UV exposure to enhance conductivity and durability, transforming the material properties from a printable slurry to a functional conductive trace.
3Manufacturing precision
If lithography process modules or specialized additive manufacturing printers are used, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses a physical screen (stencil) that contains the circuit trace pattern as a template. The screen is created by cutting or etching a non-conductive material to match the desired circuit layout. This physical copy of the circuit pattern allows direct replication of the design through screen printing, achieving manufacturing precision without requiring complex digital design software or specialized printing equipment.
4Ease of manufacture
If hazardous consumables like etching acids or conductive inks are used, then manufacturing process is simplified, but safety and environmental hazards increase
Solution Approach 1:
The patent replaces hazardous, expensive chemicals with inexpensive, non-toxic conductive inks that can be safely handled without special precautions. The conductive ink formulation uses food-grade or cosmetic-grade ingredients as the vehicle, eliminating the need for corrosive solvents and etchants. This allows the fabrication process to be performed in ordinary environments without requiring hazardous material handling facilities.
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
Facilitates the assembly of flexible circuits by non-experts using safe, inexpensive materials and reduces the risk of power source dislodgment and electrical hazards.
Implementation Method 1
The adhesive layer can be selectively adherable to the toner ink layer
Data Source
AI summary
A flexible circuit can include an electrically non-conductive substrate, a plurality of polymer particles deposited on the substrate, and an electrically conductive metallized foil. The polymer particles can be deposited onto the substrate according to a circuit trace pattern. The circuit trace pattern can define a path of at least one conductive circuit trace configured to couple electrically to a circuit element. The electrically conductive metallized foil can be configured to adhere to the polymer particles but not to the substrate to form the at least one conductive circuit trace.