Polarizing Lens Production via Moisture-Controlled Contraction and Annealing
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Solution Overview
Problem
Polarizing lenses require high luminous transmittance for automobile driving and design demands, but achieving this while maintaining a high degree of polarization and minimizing astigmatism is challenging due to the limitations of dye concentration and the deformation of polarizing films during the lens production process.
Innovation Solution
A method involving contracting polarizing films under moist conditions to a predetermined range, drying at a specific temperature T1, and annealing at a lower temperature T2, where T1 > T2, to produce a polarizing lens with high luminous transmittance and low astigmatism, involving the use of a curable composition and a mold to shape the lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the concentration of dyes in polarizing films is decreased to increase luminous transmittance, then the luminous transmittance is improved, but the degree of polarization decreases
Solution Approach 1:
The patent changes the physical-chemical parameters of the polarizing film by controlling the moisture content and contraction rate during the molding process. By setting the moisture content to 3% or more and the contraction rate to 5% or less, the patent achieves a balance between luminous transmittance and degree of polarization, resolving the contradiction between these two parameters through precise parameter optimization.
2Illumination intensity
If the rate of contraction of polarizing films is decreased to prevent luminous transmittance from becoming low, then the luminous transmittance is improved, but the polarizing films are deformed due to annealing of eyeglass lenses, increasing astigmatism
Solution Approach 1:
The patent applies preliminary action by pre-moistening the polarizing film before the molding process. By controlling the moisture content to 3% or more before molding, the film becomes more pliable and can be contracted at a lower rate (5% or less), which prevents both luminous transmittance degradation and deformation during subsequent annealing, thereby reducing astigmatism.
3Ease of manufacture
If polarizing films are contracted under moist conditions to reduce strains, then the manufacturing process is improved, but the concentrations of dyes increase and luminous transmittance decreases
Solution Approach 1:
The patent resolves this contradiction by precisely controlling the moisture content parameter to 3% or more and the contraction rate to 5% or less. This parameter optimization allows the film to be contracted under moist conditions for strain reduction while minimizing dye concentration increase, thereby maintaining high luminous transmittance.
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
This method effectively increases luminous transmittance and maintains a high degree of polarization while keeping astigmatism low, ensuring better vision quality and design flexibility for polarizing lenses.
Implementation Method 1
contracting a polarizing film at a maximum rate of contraction of 5% or more and 30% or less under moist conditions
Implementation Method 2
drying the polarizing film at temperature T1
Implementation Method 3
annealing the polarizing lens at temperature T2, wherein a relationship between the temperature T1 and the temperature T2 satisfies the following expression (1): T1>T2
Implementation Method 4
polarizing lenses are known which block light in a predetermined direction of polarization reflected by water surface or the like
Data Source
AI summary
A method for producing a polarizing lens having a high luminous transmittance and degree of polarization with astigmatism kept low, and a polarizing film and a polarizing lens. The method for producing a polarizing lens includes: contracting a polarizing film at a maximum rate of contraction of 5% or more and 30% or less under moist conditions; processing the polarizing film into a curve; drying the polarizing film at temperature T1; providing a mold having a cavity in which the polarizing film is placed in the inside; injecting a curable composition into the cavity; curing the curable composition to obtain a polarizing lens in which the polarizing film is placed in the inside; and annealing the polarizing lens at temperature T2, wherein a relationship between the temperature T1 and the temperature T2 satisfies the following expression (1): T1>T2 . . . (1).