Blue Light Cutting Optical Material with Bluish Appearance
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Solution Overview
Problem
Existing ophthalmic lenses that block blue light and UV radiation often result in an undesirable yellow or amber tint, affecting color perception and aesthetics, and struggle to achieve a neutral, bluish appearance while maintaining high transparency and comfort.
Innovation Solution
An optical material comprising a UV absorber that blocks light in the 400-450 nm range, combined with a bluing agent absorbing in the 520-640 nm range, made from polythiourethane or polyurethane urea materials, which balances color and provides effective blue light protection without significant yellow tint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a UV absorber or yellow dye is incorporated to block blue light (420-450 nm), then blue light protection is improved, but the optical material develops an undesirable yellow, brown or amber tint
Solution Approach 1:
The patent applies color balancing agents (bluing agents) that absorb in the 520-640 nm range to counteract the yellow tint produced by blue light blocking compounds. This creates a bluish appearance that compensates for the yellowing effect, achieving a cosmetically acceptable appearance while maintaining blue light protection functionality.
Solution Approach 2:
The patent combines multiple compounds with different optical properties: UV absorbers (benzotriazole, benzophenone, cinnamic acid derivatives) for blue light blocking, and color balancing agents (anthraquinone, indigo, phthalocyanine dyes) for color compensation. This composite approach allows simultaneous achievement of blue light protection and acceptable color appearance.
2Object-affected harmful factors
If blue light blocking compounds are used to protect against harmful wavelengths, then eye protection is improved, but the cosmetic appearance and transparency of the optical material deteriorates
Solution Approach 1:
The patent uses color balancing agents that absorb in the 520-640 nm range to create a bluish appearance that compensates for the yellowing effect of blue light blocking compounds. This maintains high transparency in the visible spectrum while providing eye protection.
3Object-affected harmful factors
If yellow dyes are incorporated to block blue light, then blue light filtration is improved, but the aesthetic appearance and color neutrality of the optical material worsens
Solution Approach 1:
The patent employs color balancing agents (bluing agents) that absorb in the 520-640 nm range to counteract the yellow tint produced by blue light blocking dyes. This creates a bluish appearance that compensates for the yellowing effect, achieving both blue light filtration and acceptable aesthetic appearance.
Solution Approach 2:
The patent preemptively adds color balancing agents to counteract the unwanted yellow tint before it becomes a cosmetic defect. By incorporating both blue light blocking compounds and color balancing agents from the start, the patent prevents the development of undesirable yellow appearance while maintaining blue light protection.
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 achieves a bluish appearance with high transparency and effective blue light protection, maintaining color perception and comfort, while resisting photo-degradation and ensuring a cosmetically acceptable appearance.
Implementation Method 1
a UV absorber that blocks light in the 400-450 nm range
Implementation Method 2
a bluing agent absorbing in the 520-640 nm range
Data Source
AI summary
The present invention relates to an optical material cutting blue light, comprising at least one UV absorber that at least partially blocks light having a wavelength ranging from 400 to 450 nm, at least one absorbing dye A having its maximum absorption wavelength in the range from 520 nm to 640 nm, the optical material being made of a material chosen from polythiourethane materials, polyurethane urea materials, materials resulting from the polymerization or copolymerization of polyepisulfide monomers or oligomers, and materials resulting from the polymerization or copolymerization of allylic monomers or oligomers, the optical material having a colorimetric coefficient b* as defined in the CIE (1976) L*a*b* international colorimetric system that is lower than or equal to 6, and a hue angle h higher than or equal to 120° and lower than or equal to 180°, for an optical material thickness of 2 mm.