Optical material
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Solution Overview
Problem
Existing optical materials do not effectively reduce migraine caused by photosensitivity while maintaining a natural hue and adequate luminous transmittance, particularly in the blue light range around 420 nm.
Innovation Solution
An optical material with a specific transmittance curve and luminous transmittance profile, characterized by a maximum transmittance of 20-65% at 410-450 nm, increasing transmittance from 450-700 nm, 50% transmittance at 450 nm, 95% transmittance at 700 nm, and luminous transmittance of 70-85%, achieved through the use of dyes and resins like poly(thio)urethane, poly(thio)urethane urea, and specific isocyanate compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If blue light transmittance is reduced to prevent migraine, then migraine prevention is improved, but natural hue and luminous transmittance deteriorate
Solution Approach 1:
The patent applies local quality by creating non-uniform transmittance across different wavelength ranges. Specifically, the lens has low transmittance (20-65% maximum) in the blue light range (410-450 nm) to block migraine-causing wavelengths, while maintaining high transmittance (95% or more) in the red light range (600-700 nm) to preserve natural vision and appearance. This wavelength-selective approach allows simultaneous migraine prevention and natural hue maintenance.
Solution Approach 2:
The patent uses parameter changes by precisely controlling transmittance values at specific wavelengths. The transmittance is set to 50% or more at 450 nm and 95% or more at 700 nm, with luminous transmittance maintained between 70-85%. These specific parameter ranges optimize both migraine prevention and natural appearance, resolving the contradiction between blocking harmful blue light and maintaining adequate overall light transmission.
2Object-affected harmful factors
If blue light transmittance is reduced to prevent migraine, then migraine prevention is improved, but natural hue deteriorates
Solution Approach 1:
The patent applies local quality by creating non-uniform transmittance across different wavelength ranges. Specifically, the lens has low transmittance (20-65% maximum) in the blue light range (410-450 nm) to block migraine-causing wavelengths, while maintaining high transmittance (95% or more) in the red light range (600-700 nm) to preserve natural vision and appearance. This wavelength-selective approach allows simultaneous migraine prevention and natural hue maintenance.
Solution Approach 2:
The patent uses color changes by strategically selecting which wavelengths are transmitted and blocked. By allowing red light (600-700 nm) with 95% or more transmittance to pass through while blocking blue light (410-450 nm), the lens maintains a natural hue that is acceptable in appearance. The transmittance increases substantially from 450 nm to 700 nm, creating a natural color balance that prevents migraine while preserving natural appearance.
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 migraine caused by photosensitivity and provides an optical material with a natural hue, offering high transmittance in desired wavelength ranges and blocking blue light around 420 nm.
Implementation Method 1
a maximum transmittance at a wavelength of from 410 nm to 450 nm is from 20% to 65%
Data Source
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AI summary
In an optical material of the disclosure, a transmittance curve satisfies the following characteristic (1) and a luminous transmittance satisfies the following characteristic (2), the transmittance curve and the luminous transmittance being measured at a thickness of 2 mm, (1) a maximum transmittance at a wavelength of from 410 nm to 450 nm is from 20% to 65%, and (2) the luminous transmittance is from 70% to 85%.