Self-supporting Film with Rugged Structure for Anti-reflection
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Solution Overview
Problem
Conventional methods for producing self-supporting films with rugged structures face challenges in achieving thinness and conforming to complex shapes, such as spherical surfaces, leading to film breakage and gaps during demolding, which affects their anti-reflection performance.
Innovation Solution
A self-supporting film with a rugged-structure layer formed by coating a polymer solution onto a substrate with periodic shapes, using resins with high yield strain and tensile elongation, allowing for thinness between 0.2 μm to 20.0 μm and excellent shape conforming ability, without a base material, and featuring periodic protrusions for enhanced anti-reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mold having periodic rugged shapes is filled with curable resin or thermoplastic resin and cured, then an anti-reflection film with rugged shapes can be manufactured, but the film is difficult to produce due to film breakage during demolding
Solution Approach 1:
The patent changes the physical and chemical parameters of the resin material by selecting specific polymers with controlled molecular weight, flexibility, and curing characteristics. This allows the resin to be moldable during formation yet resistant to breakage during demolding, resolving the contradiction between achieving precise rugged shapes and maintaining film integrity.
Solution Approach 2:
The patent uses composite resin compositions combining multiple polymer components with complementary properties. The composite structure provides both the rigidity needed for precise shape formation and the flexibility required for successful demolding without film breakage.
2Adaptability or versatility
If the self-supporting film is made thinner to improve conforming ability to curved surfaces, then shape conforming ability is enhanced, but film strength decreases leading to breakage
Solution Approach 1:
The patent optimizes resin parameters including molecular weight distribution, cross-linking density, and plasticizer content to achieve the optimal balance between thinness and strength. These parameter adjustments enable the film to be thin enough for good conforming ability while maintaining sufficient strength to prevent breakage.
Solution Approach 2:
The patent introduces intermediary substances such as plasticizers and flexible polymer chains within the resin composition. These intermediaries act as molecular-level connectors that maintain film integrity while allowing the thin film to conform to curved surfaces.
3Ease of manufacture
If conventional anti-reflection films relying on interference are used, then manufacturing is simpler, but angle characteristic and wavelength band coverage are inferior
Solution Approach 1:
The patent implements periodic rugged shapes (curved microstructures) on the film surface instead of flat conventional structures. This curvature at the micro-scale creates the anti-reflection effect through gradient refractive index, providing superior angle characteristic and wavelength band coverage while maintaining reasonable manufacturing complexity.
Solution Approach 2:
The patent creates a periodic porous or rugged structure within the resin film that provides optical functionality. This internal structure manipulation achieves enhanced optical performance without requiring complex multi-layer stacking, balancing manufacturing ease with optical versatility.
4Area of stationary object
If the self-supporting film is affixed to spherical surface shapes, then coverage of curved surfaces is achieved, but gaps appear between the film and surface
Solution Approach 1:
The patent adjusts resin parameters including viscosity, elasticity, and curing shrinkage characteristics to enable the film to adapt to spherical and curved surfaces. These parameter optimizations allow the film to maintain intimate contact with curved surfaces during affixing, preventing gap formation while achieving complete surface coverage.
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 the production of self-supporting films with excellent optical characteristics and improved shape conforming ability, reducing the likelihood of gaps when affixed to curved surfaces and enhancing anti-reflection performance across a wide wavelength band.
Implementation Method 1
coating a polymer solution onto a substrate with periodic shapes
Implementation Method 2
curing then the resin
Data Source
AI summary
Provided is a self-supporting film that has an anti-reflection function independently, so that the self-supporting film exhibits excellent optical characteristics as a result. A self-supporting film has a rugged-structure layer having periodic rugged shapes formed on a surface thereof, with these periodic rugged shapes being formed on at least one surface. The average thickness of the self-supporting film ranges from 0.2 μm to 20.0 μm. The rugged-structure layer has a yield strain of 1% or greater and a tensile elongation of 10% or greater.