Wear-Resistant Liquid Repellent Layer on Magnesium Fluoride Lenses
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid repellent agents struggle to form a stable, wear-resistant monomolecular layer on magnesium fluoride surfaces without increasing electrical resistance or optical interference, making it difficult to maintain the anti-reflective function and prevent staining of optical lenses.
Innovation Solution
A process involving the formation of a magnesium oxide layer on magnesium fluoride surfaces, followed by the application of a liquid repellent layer with a perfluoropolyether or perfluoroalkyl chain, which is chemically bound using alkoxysilane or chlorosilane residues, ensuring high wear resistance and maintaining optical clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fluorine-based resin coating is applied to the lens surface to prevent staining, then liquid repellency and stain resistance are improved, but electrical resistance increases causing static electricity accumulation that attracts dust
Solution Approach 1:
The patent changes the key parameter of surface energy by using a fluorine-based resin with specifically controlled molecular structure and coating thickness. By adjusting the fluorine content and coating thickness to optimal ranges, the surface achieves high liquid repellency while maintaining electrical conductivity below 10^15 Ω, preventing static electricity accumulation that would attract dust.
Solution Approach 2:
The patent creates a composite coating system combining fluorine-based resin with specific molecular structures (containing CF2 or CF3 groups) on the lens surface. This composite structure integrates the liquid repellent properties of fluorine compounds while controlling the electrical properties through molecular design, achieving both stain resistance and reduced static electricity.
2Object-affected harmful factors
If a liquid repellent layer is coated on the anti-reflective membrane, then stain resistance is improved, but the anti-reflective function deteriorates due to increased reflectivity
Solution Approach 1:
The patent precisely controls the coating thickness parameter within 1-20 nm and adjusts the fluorine compound concentration and molecular weight to optimize the balance between liquid repellency and optical properties. This parameter optimization ensures the coating provides sufficient stain resistance while maintaining light transmittance above 90% and reflectivity below 2%.
Solution Approach 2:
The patent applies the liquid repellent coating selectively on the outermost magnesium fluoride layer of the anti-reflective membrane structure. This localized application ensures that the anti-reflective multi-layer structure remains intact and functional, while only the outermost surface gains liquid repellent properties, preserving overall optical performance.
3Object-affected harmful factors
If a fluorine-based resin coating is applied to prevent staining, then liquid repellency is improved, but wear resistance decreases making the coating easily removed during cleaning
Solution Approach 1:
The patent develops a composite coating system where fluorine-based resin molecules are chemically bonded to the magnesium fluoride substrate through specific functional groups. This composite structure integrates the liquid repellent properties of fluorine compounds with the hard, wear-resistant properties of the magnesium fluoride base, creating a durable coating that resists removal during cleaning while maintaining high liquid repellency.
Solution Approach 2:
The patent performs preliminary surface treatment of the magnesium fluoride layer before applying the fluorine-based resin coating. This preliminary action includes surface activation and cleaning procedures that create optimal bonding conditions, ensuring the subsequent fluorine coating adheres strongly to the substrate and maintains wear resistance during repeated cleaning operations.
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 provides a stable, wear-resistant liquid repellent layer that prevents staining and maintains the anti-reflective properties of optical lenses, even under frequent cleaning and exposure to contaminants, without increasing electrical resistance or affecting light transmittance.
Implementation Method 1
a liquid repellent layer with a perfluoropolyether or perfluoroalkyl chain, which is chemically bound using alkoxysilane or chlorosilane residues
Implementation Method 2
the formation of a magnesium oxide layer on magnesium fluoride surfaces
Implementation Method 3
coating the surface with a fluorine-based resin, known for its high liquid repellency, to decrease surface energy
Data Source
AI summary
It is an object to form a highly wear-resistant liquid repellent layer on a non-oxide surface. The oxide layer 8 is formed on the non-oxide material 1 surface. The oxide layer 8 is bound to the liquid repellent layer 3, made of a compound having a perfluoropolyether or perfluoroalkyl chain, at the binding sites 2.