Porous Optical Layer with Fluorinated Acid Binder
Solution Overview
Problem
Conventional antireflection films with low refractive indices face challenges in achieving both low scattering and sufficient film strength, as they often lack organic binders which are necessary for strength but can cause scattering issues with silica particles.
Innovation Solution
A porous layer is formed on an optical member using silicon oxide particles and an inorganic binder, with a fluorine-containing organic acid on the surface of the particles to improve dispersibility and maintain alignment during film formation, resulting in a coating liquid that achieves low scattering and enhanced film strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a porous layer is formed without organic polymer to suppress scattering, then scattering is reduced, but film strength becomes insufficient
Solution Approach 1:
The patent introduces a specific binder resin as an intermediary substance that mediates between the silica particles and the coating matrix. This binder resin with hydroxyl groups forms hydrogen bonds with silica particle surfaces, enabling effective binding without causing aggregation, thus simultaneously achieving low scattering and sufficient film strength
Solution Approach 2:
The patent changes the chemical parameters of the binder resin by specifying functional groups (hydroxyl groups) and molecular weight ranges. This parameter optimization allows the binder to interact effectively with silica particles through hydrogen bonding while maintaining film integrity and preventing scattering
2Strength
If organic polymer is added to improve film strength, then film strength is enhanced, but scattering increases due to aggregation
Solution Approach 1:
The patent optimizes the molecular weight parameter of the binder resin within a specific range (100-10,000) and specifies the presence of hydroxyl groups. This parameter control prevents excessive polymerization and aggregation while maintaining sufficient binding strength, thereby avoiding scattering issues
Solution Approach 2:
The binder resin acts as an intermediary with controlled molecular characteristics that prevent direct aggregation between silica particles. The hydroxyl groups serve as interaction sites that bind to silica surfaces without causing particle clumping, thus maintaining optical clarity while providing mechanical strength
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 effectively reduces scattering and improves film strength, enabling the formation of antireflection films with optimal optical performance and durability.
Implementation Method 1
the silicon oxide particle has a fluorine-containing organic acid on the surface
Data Source
AI summary
An optical member having a porous layer having both low scattering and film strength is provided. The optical member is an optical member, having a porous layer in which a plurality of silicon oxide particles are bound with an inorganic binder on a base material, and the porous layer contains a fluorine-containing organic acid having 5 or more and 11 or less fluorine atoms in one molecule.