Solution Casting Dyed Optical Film for Lens Coating
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Solution Overview
Problem
Traditional methods for manufacturing IR and visible coated lenses, such as extrusion and injection molding, face challenges including uneven coating on curved surfaces, dye degradation due to heat, susceptibility to scratches and chemicals, and increased thickness, which affects eye protection and aesthetics, while also being costly.
Innovation Solution
The solution casting method is used to create functional films by dissolving polymers or PVA materials in solvents, adding dyes to form soluble solutions, and then casting these solutions into thin films without excessive heat, allowing for precise dye incorporation and minimal layering, resulting in films with high optical purity and dimensional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional coating methods (dipping or spraying) are used to apply IR or visible dyes on curved lenses, then the lenses can be protected from harmful rays, but the coating application becomes uneven due to lens curvature
Solution Approach 1:
The patent divides the coating process into two independent stages: first, a uniform flat film is cast using solution casting method ensuring even dye distribution; second, the flat film is laminated onto the curved lens surface. This segmentation resolves the contradiction by decoupling the coating application from the lens curvature, allowing uniform coating on the flat film while accommodating any lens shape during lamination.
Solution Approach 2:
The patent performs the coating action in advance by casting the dyed polymer solution into a flat film before the lens is even introduced. This preliminary casting ensures uniform coating without the interference of lens curvature, and the pre-coated flat film is then simply laminated onto the lens, eliminating the need for complex curved-surface coating operations.
2Stability of the object's composition
If extrusion or injection molding methods are used to add IR or visible dyes during the manufacturing process, then the dyes are incorporated into the lens, but heat is required to soften the plastic which causes dye degradation
Solution Approach 1:
The patent merges the dye incorporation step with the film casting process by adding dyes to the polymer solution before casting. This combination allows dye incorporation without requiring separate high-temperature processing steps, as the solution casting method uses minimal heat that does not degrade the dyes.
Solution Approach 2:
The patent replaces the thermal-mechanical extrusion or injection molding process with a solution casting process that relies on solvent evaporation rather than high-temperature melting. This substitution eliminates the excessive heat that causes dye degradation while still achieving proper polymer film formation through controlled solvent removal.
3Reliability
If additional protection layers are added to coated lenses to prevent scratches and chemical damage, then the lenses gain resistance to scratches and chemicals, but the lens thickness increases
Solution Approach 1:
The patent creates a composite structure by laminating the dyed polymer film with additional protective layers. This composite approach provides both the optical protection from the dyed film and the mechanical protection from the protective layers, while keeping the overall structure thin through efficient layer integration.
Solution Approach 2:
The patent uses thin film technology to provide protection without significant thickness increase. The dyed polymer film and protective layers are applied as thin coatings that provide adequate protection while maintaining lens thinness, contrary to traditional bulky protective layers.
4Reliability
If multiple layers are used to provide both IR/visible protection and scratch resistance, then comprehensive protection is achieved, but the number of layers and manufacturing complexity increase
Solution Approach 1:
The patent combines multiple functions into a single integrated film by incorporating both the IR/visible absorbing dyes and the protective polymer matrix in one casting process. This merging eliminates the need for separate coating steps and reduces the number of discrete layers while maintaining comprehensive protection.
Solution Approach 2:
The dyed polymer film serves multiple functions simultaneously: it provides optical protection by absorbing harmful rays, acts as a structural layer for lamination, and can be formulated with additives to provide scratch and chemical resistance. This multi-functionality reduces the need for separate specialized layers.
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 produces films with maximum optical purity, low haze, and excellent flatness, preventing dye degradation and reducing the number of layers needed, thus enhancing eye protection while maintaining thinness and reducing material costs.
Implementation Method 1
dissolving polymers or PVA materials in solvents, adding dyes to form soluble solutions
Implementation Method 2
casting these solutions into thin films
Implementation Method 3
letting the film dry and solidified
Data Source
AI summary
A method to make dyed functional film comprising the steps of providing a soluble polymer material; adding an appropriate solvent to the polymer material to make a soluble polymer solution; providing a soluble dye; adding an appropriate solvent to the dye to make a soluble dye solution; adding the dye solution to the polymer or PVA solution, and introducing the dyed polymer or PVA solution to a solution casting device; removing a thin dyed functional film from the casting device; and letting the dyed functional film dry and solidified.