Spectacle Lens Water-and-Oil Repellent Layer Edge Processability
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Solution Overview
Problem
Spectacle lenses with water-and-oil repellent layers face challenges in maintaining sufficient repellency and edge processability due to the slippery surface caused by fluorine-substituted alkyl group-containing organosilicon compounds, leading to axis deviation during edge processing.
Innovation Solution
A spectacle lens is developed using a combination of a first and second fluorine-substituted alkyl group-containing organosilicon compounds in a multi-layered anti-reflection film with a silicon dioxide outermost layer, enhancing both water-and-oil repellency and edge processability by adjusting the dynamic friction coefficients and molecular weights of the compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water-and-oil repellent layer is formed using fluorine-substituted alkyl group-containing organosilicon compounds, then water-and-oil repellency is improved, but edge processability deteriorates due to slippery surface causing axis deviation
Solution Approach 1:
The patent changes the molecular weight parameter of the fluorine-substituted alkyl group-containing organosilicon compound from conventional ranges to specifically 500-5000, and adjusts the dynamic friction coefficient to 0.05-0.20. These parameter modifications resolve the contradiction by optimizing the balance between water-and-oil repellency and edge processability, preventing axis deviation during edge processing while maintaining sufficient repellency.
Solution Approach 2:
The patent uses composite material strategy by combining fluorine-substituted alkyl group-containing organosilicon compounds with specific molecular weights (500-5000) and controlled dynamic friction coefficients (0.05-0.20) with the anti-reflection film structure. This composite approach allows the water-and-oil repellent layer to maintain adhesion to the lens surface during edge processing while providing sufficient repellency, resolving the contradiction between repellency and edge processability.
2Reliability
If the dynamic friction coefficient is reduced to enhance water-and-oil repellency, then repellency is improved, but edge processing accuracy deteriorates due to increased slipperiness
Solution Approach 1:
The patent precisely controls the dynamic friction coefficient parameter within the range of 0.05-0.20, which is higher than conventional ultra-low friction coatings. This parameter adjustment resolves the contradiction by maintaining enough friction to prevent axis deviation during edge processing while still providing effective water-and-oil repellency through the fluorine-substituted alkyl groups.
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 lens achieves extended water-and-oil repellency and improved edge processability, reducing axis deviation during edge processing, while maintaining durability and repellency.
Implementation Method 1
a water-and-oil repellent layer which is provided in contact with the outermost layer of the multi-layered anti-reflection film and is made by using: at least one kind of a first fluorine-substituted alkyl group-containing organosilicon compound; and a second fluorine-substituted alkyl group-containing organosilicon compound
Implementation Method 2
a layer mainly made of silicon dioxide as an outermost layer; and a water-and-oil repellent layer provided in contact with the outermost layer of the multi-layered anti-reflection film, and made by using, as raw materials
Data Source
AI summary
The disclosure relates to a spectacle lens comprising: a lens base member; a multi-layered anti-reflection film placed on the lens base member, and including a layer mainly made of silicon dioxide as an outermost layer; and a water-and-oil repellent layer provided in contact with the outermost layer of the multi-layered anti-reflection film, and made by using, as raw materials: at least one kind of a first fluorine-substituted alkyl group-containing organosilicon compound and a second fluorine-substituted alkyl group-containing organosilicon compound. The disclosure also relates to methods of producing a spectacle lens that is capable of retaining a sufficient water-and-oil repellency over an extended period, and having sufficient edge processability.