Selective Adhesion PCB Prototyping via UV Curing
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Solution Overview
Problem
Conventional methods for constructing circuit patterns on printed circuit boards (PCBs) are expensive, time-consuming, and often require specialized equipment and harsh chemicals, complicating the prototyping process and lacking durability for soldering electrical components.
Innovation Solution
A PCB page blank comprising a flexible substrate, a curable adhesive, and a conductive layer, where the adhesive is selectively cured using light to bond with the conductive layer, allowing for rapid and cost-effective prototyping without the need for etching chemicals or specialized equipment, enabling the creation of fully functional and flexible PCBs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional chemical methods (etchants, washes, chemical deposition) are used to form conductive layers, then circuit patterns can be produced, but the process becomes expensive and time-consuming requiring special processing or outsourcing
Solution Approach 1:
The patent replaces complex chemical processes (etchants, chemical deposition) with a simpler mechanical/physical process: printing conductive ink directly onto the substrate and selectively curing it with UV light. This substitution eliminates the need for multiple chemical baths and specialized chemical processing equipment, thereby reducing both time and cost while maintaining circuit pattern formation capability
Solution Approach 2:
The patent changes the state of the conductive material from requiring chemical deposition to using a printable ink formulation that can be selectively cured. By changing the physical-chemical parameters of the conductive material (using UV-curable conductive ink instead of traditional chemical deposits), the process becomes faster and less expensive while achieving the same circuit pattern formation function
2Manufacturing precision
If conventional chemical methods are used, then circuit patterns can be formed, but the process requires outsourcing and special processing which complicates manufacturing
Solution Approach 1:
The patent replaces complex chemical processing systems with a simple printing and UV curing system. Instead of requiring multiple chemical baths, rinsing stations, and specialized deposition equipment, the invention uses a printer to deposit conductive ink and a UV light source to cure it, dramatically simplifying the manufacturing process while maintaining circuit pattern formation capability
Solution Approach 2:
The patent extracts and removes the complex chemical processing steps (etchants, washes, chemical deposition) from the manufacturing process, retaining only the essential function of forming conductive patterns. By taking out the problematic chemical processes and replacing them with printing and curing, the manufacturing complexity is reduced while the core function remains
3Ease of manufacture
If milling operations or conductive ink printing are used, then PCBs can be manufactured, but specialized equipment is required and material costs are high
Solution Approach 1:
The patent changes the form and application method of conductive material from expensive pre-formed traces or heavy ink applications to a optimized printable ink formulation. By changing the parameters of the conductive material (viscosity, particle size, UV reactivity) to be suitable for printing, the material cost is reduced and ease of manufacture is improved while achieving the same electrical function
4Ease of manufacture
If conductive ink printing is used, then PCBs can be manufactured, but the process lacks durability for soldering electrical components
Solution Approach 1:
The patent uses composite conductive ink materials that combine conductive particles with UV-curable binders. This composite formulation provides both the electrical conductivity needed for circuit function and the mechanical strength and adhesion durability required for soldering. The composite nature of the material allows it to be printed like conventional ink while providing the durability of traditional conductive traces
Solution Approach 2:
The patent changes the curing mechanism from air-drying or thermal curing to UV photopolymerization. This parameter change in the curing process creates a cross-linked polymer network in the conductive ink that provides superior adhesion and mechanical strength, enabling durable soldering while maintaining the ease of printing application
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 method enables rapid, cost-effective, and durable PCB prototyping, reducing material waste and eliminating the need for outsourcing or complex processes, resulting in fully functional and flexible PCBs suitable for various applications.
Implementation Method 1
Portions of the curable adhesive may be selectively cured via light
Data Source
AI summary
A PCB page blank includes a flexible substrate, a curable adhesive, a conductive layer, and a conductive layer support. The flexible substrate receives an opaque negative circuit pattern thereon. Portions of the curable adhesive not obscured by the circuit pattern may bond to portions of the conductive layer when exposed to light. The bonded portions of the conductive layer shear or tear from non-bonded portions of the conductive layer such that the bonded portions remain with the flexible substrate and the non-bonded portions remain with the conductive layer support when the flexible substrate and the conductive layer support are separated. The flexible substrate and the bonded portions of the conductive layer thus form a PCB prototype with the bonded portions of the conductive layer forming circuit traces of the circuit pattern.