Plasma Nanostructured Anti-Fog Optical Element
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Solution Overview
Problem
Optical elements made of glass or plastic face issues with condensation and reflection in humid environments, leading to impaired transmission, and existing anti-fog and antireflection solutions often compromise water absorption or result in undesirable color effects when light is incident at angles.
Innovation Solution
A method involving a plasma etching process to create a nanostructure on an anti-fog polymer layer, which extends into the layer's depth, combined with a thin oxide layer and a transparent protective layer, and optionally a hydrophobic layer, to achieve effective anti-reflective and anti-fogging properties without compromising water absorption or causing color issues at oblique light incidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a porous oxide layer or interference layer system is applied to achieve antireflection, then reflection is reduced, but the water absorption capability of the anti-fog polymer layer is impaired
Solution Approach 1:
The patent applies a plasma-generated nanostructure with porous characteristics directly on the anti-fog polymer layer surface. This porous nanostructure achieves antireflection through light scattering and interference effects while maintaining the underlying polymer layer's hydrophilic properties and water absorption capability intact, avoiding the need to apply additional porous oxide layers that would block water penetration.
Solution Approach 2:
The patent creates a surface nanostructure that copies the functional properties of complex multilayer antireflection systems but achieves the same effect through a single plasma-treated layer. The nanostructure on the polymer layer surface replicates the optical interference effects of traditional porous oxide layers without requiring separate material layers, thus preserving water absorption while achieving antireflection.
2Object-affected harmful factors
If traditional antireflection coatings are applied to reduce reflection, then transparency is improved, but undesired color impressions occur when light incidence is oblique
Solution Approach 1:
The patent changes the physical parameters of the surface by creating a nanostructure with specific pore sizes and distributions through plasma treatment. This nanostructure produces broadband antireflection effects that remain color-neutral across different viewing angles, unlike traditional thin-film interference coatings that exhibit strong angle-dependent color shifts. The nanostructure's multiple scattering paths and gradual refractive index transition maintain consistent optical appearance.
3Object-affected harmful factors
If additional layers are applied to the anti-fog polymer layer to achieve antireflection, then reflection is reduced, but the complexity of the coating system increases
Solution Approach 1:
The patent merges the antireflection function with the existing anti-fog polymer layer by applying plasma treatment directly to its surface. This combines what would traditionally require separate antireflection and anti-fog layers into a single integrated coating system. The plasma-generated nanostructure provides antireflection while the underlying polymer maintains anti-fog properties, eliminating the need for additional porous oxide layers or complex multilayer interference systems.
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 method produces an optical element with a neutral color effect, improved reflection reduction, and insignificantly impaired anti-fogging performance, even at oblique light angles, while maintaining mechanical stability and ease of cleaning, with enhanced transmission and resistance to external influences.
Implementation Method 1
a plasma etching process to produce a nanostructure on a surface of an anti-fog polymer layer by bombarding the anti-fog polymer layer surface with high-energy ions
Implementation Method 2
bombarding the substrate surface with high-energy ions, which are generated using a plasma ion source
Implementation Method 3
the reflection-reducing effect of which is based on optical interference
Implementation Method 4
fog-reducing polymer layers contain highly hydrophilic polymers that can absorb water, so that when water condenses, fine water droplets are absorbed by the layer within a short time
Data Source
Figure 1A~1C
Figure 2~4
Figure 5
AI summary
On an optical element (1), which is provided with a fogging-reducing polymer layer (2), a reflection-reducing nanostructure (7) is formed on the surface of the fogging-reducing polymer layer(2).