Thiourethane Spectacle Lens Near-Infrared Absorption
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Solution Overview
Problem
Conventional spectacle lenses that absorb near-infrared light suffer from compatibility issues with resin materials, leading to precipitation and decreased light resistance, resulting in haze and altered tint, which affects visibility and comfort.
Innovation Solution
A spectacle lens comprising a thiourethane resin and a near-infrared absorbing agent with a maximum absorption wavelength between 700 nm and 1000 nm, featuring high transmittance in the visible light region to minimize tint changes and block near-infrared light effectively, using specific agents like cyanine, oxonol, or squarylium coloring agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a diimmonium-based near-infrared coloring agent is used to absorb near-infrared light, then near-infrared light absorption is improved, but the coloring agent precipitates in the resin and shows poor compatibility
Solution Approach 1:
The patent changes the chemical parameters of the coloring agent by selecting specific compounds (cyanine, oxonol, squarylium, or pyrrolopyrrole types) with defined molecular structures and functional groups that are chemically compatible with thiourethane resin, preventing precipitation while maintaining near-infrared absorption capability
Solution Approach 2:
The patent creates a composite material system combining specific coloring agents with thiourethane resin, where the resin matrix provides both mechanical strength and chemical compatibility with the coloring agent, forming a stable homogeneous mixture that prevents precipitation
2Object-affected harmful factors
If a diimmonium-based near-infrared coloring agent is used, then near-infrared light absorption is improved, but the coloring agent decomposes and deteriorates due to low light resistance
Solution Approach 1:
The patent changes the chemical stability parameters by selecting coloring agents with rigid molecular structures and strong chemical bonds that resist photodecomposition, specifically choosing compounds with high light resistance that maintain their absorption properties over time
3Object-affected harmful factors
If a diimmonium-based near-infrared absorbing coloring agent is used, then near-infrared light absorption is improved, but the lens shows deteriorated tint and broad absorption waveform
Solution Approach 1:
The patent applies local quality by selecting coloring agents with narrow absorption bands centered in the near-infrared region (700-1000 nm) that do not significantly absorb visible light, creating a localized absorption profile that blocks harmful near-infrared radiation while preserving visible light transmission for clear vision
Solution Approach 2:
The patent optimizes the absorption spectrum parameters by choosing coloring agents with specific peak wavelengths and narrow half-widths in the near-infrared region, preventing broad absorption that would cause visible light blocking and tint deterioration
4Object-affected harmful factors
If conventional near-infrared absorbing agents are used, then near-infrared light blocking is improved, but the lens shows increased haze over time due to decreased compatibility
Solution Approach 1:
The patent changes the chemical compatibility parameters by selecting coloring agents with molecular structures that are chemically compatible with thiourethane resin, preventing phase separation and precipitation that would cause haze formation over time
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 lens that effectively blocks near-infrared light while maintaining high visible light transmittance, preventing tint changes and reducing eye fatigue, with improved durability and compatibility to prevent haze and precipitation.
Implementation Method 1
a near-infrared absorbing agent having a maximum absorption wavelength in a thiourethane resin in a range of more than 700 nm and 1000 nm or less
Data Source
AI summary
A lens for spectacles and spectacles a resin and a near-infrared absorbing agent having a maximum absorption wavelength in a thiourethane resin in a range of more than 700 nm and 1000 nm or less and a transmittance of light at 400 nm of 50% or more and 100% or less.