Indole-Based UV Absorbing Lens for Protective Eyewear
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Solution Overview
Problem
Conventional light shielding resin lenses for medical eyeglasses fail to reliably cut ultraviolet and visible radiation with wavelengths of 430 nm and shorter, and lack sufficient color variation, making them inadequate for protecting eyes from harmful radiation while maintaining visibility and color preference.
Innovation Solution
A light-shielding lens comprising 100 parts by mass of synthetic resin and 0.01 to 2 parts by mass of an ultraviolet absorbing dye with a melting point of 140 to 150° C., specifically using an indole-based ultraviolet absorbing agent and an oil-soluble dye to effectively absorb radiation, allowing for wide color variation and improved transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ultraviolet absorbing agents are used in CR39 resin lenses, then the lens can provide some ultraviolet protection, but the lens cannot reliably cut ultraviolet and visible radiation having wavelengths of 430 nm and shorter
Solution Approach 1:
The patent changes the chemical parameters of the ultraviolet absorbing agent by selecting indole-based compounds with specific molecular structures and absorption characteristics. These compounds have maximum absorption wavelengths in the 380-420 nm range, which enables reliable cutting of radiation at 430 nm and shorter wavelengths while maintaining compatibility with CR39 resin.
Solution Approach 2:
The patent creates a composite material system by combining CR39 resin with indole-based ultraviolet absorbing agents. This composite approach allows the lens to integrate both the structural properties of CR39 and the enhanced ultraviolet absorption capabilities of the indole compounds, achieving reliable radiation cutting at 430 nm and shorter wavelengths.
2Object-affected harmful factors
If chrome or chrome oxide is deposited on lenses, then ultraviolet radiation can be cut, but the lenses become yellowish or reddish in color, reducing color variation
Solution Approach 1:
The patent changes the optical parameters of ultraviolet absorption by using indole-based compounds that absorb in the 380-420 nm range rather than relying on chrome deposition. This allows the lens to maintain a more natural color appearance while achieving effective ultraviolet and short-wavelength visible radiation cutting, thereby preserving color variation options.
3Object-affected harmful factors
If organic cobalt compounds are used to cut ultraviolet radiation, then protection is provided, but the lenses exhibit limited color variation and cannot satisfy user demand for color
Solution Approach 1:
The patent changes the chemical composition parameters by replacing organic cobalt compounds with indole-based ultraviolet absorbing agents. The indole compounds provide equivalent or superior ultraviolet protection with maximum absorption at 380-420 nm, while offering better color stability and compatibility with various lens tints, thus satisfying user demand for color variation.
4Reliability
If indole-based compounds are used as ultraviolet absorbing agents, then reliable cutting of radiation at 430 nm and shorter wavelengths is achieved, but the compounds must be sufficiently dissolved in the CR39 resin
Solution Approach 1:
The patent optimizes the molecular structure parameters of the indole-based compounds to enhance their solubility in CR39 resin while maintaining their ultraviolet absorption effectiveness. By selecting indole compounds with appropriate molecular weights and functional groups, the patent achieves both reliable radiation cutting at 430 nm and shorter wavelengths and sufficient dissolution in the resin matrix.
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 effectively cuts ultraviolet and visible radiation with wavelengths of 430 nm and shorter, providing adequate protection and color options, while maintaining high transparency and anti-glare properties.
Implementation Method 1
an ultraviolet absorbing dye having a melting point of 140 to 150° C.... effectively absorb radiation
Data Source
AI summary
A light-shielding lens which can cut ultraviolet or visible radiation having wavelengths of 430 nm and shorter or of 500 nm and shorter and which can sufficiently satisfy users' demand for its color. The lens contains 0.01 to 2 parts by mass of an indole-based ultraviolet absorbing dye having a melting point of 140 to 150° C., based on 100 parts by mass of a synthetic resin forming the lens, and preferably further contains an oil-soluble dye, whereby the lens can cut ultraviolet and visible radiation having wavelengths of 430 nm and shorter. Since the predetermined amount of the indole-based ultraviolet absorbing dye is sufficiently dissolved in the synthetic resin, it efficiently reveals its expected function. The lens can thus cut ultraviolet and visible radiation having wavelengths of 430 nm and shorter, or even 500 nm and shorter, while keeping highly transparent light color.