Ophthalmic Lens Pair Antireflection Coating Color Intensity Control
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Solution Overview
Problem
Current antireflection coatings on ophthalmic lenses often have inconsistent residual reflection colors, making it difficult to distinguish between lenses with the same perceived chromatic color but different intensity levels, and fail to meet the requirement of a luminous reflection factor of 2.5% or less, which is necessary for true antireflection.
Innovation Solution
The development of ophthalmic lens pairs with antireflection coatings on both front and rear faces, where one coating has a high intensity residual reflection with a mean reflection factor of 1.20% or more and a chroma value of 15 or higher, and the other has a low intensity residual reflection with a mean reflection factor of 1.65% or less and a chroma value of 10 or lower, ensuring a controlled gap between the two and maintaining the same perceived chromatic color within a 60° hue angle difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the antireflection coating reflection factor is increased to enhance color perception, then the residual reflection becomes more luminous, but the color perception is significantly reduced
Solution Approach 1:
The invention changes the parameters of the antireflection coating by controlling the mean reflection factor within a specific range (0.5% to 2.0%) and adjusting the chroma value (C*) to between 5 and 20. This parameter optimization allows the coating to maintain both adequate luminous reflection (Rv ≤ 2.5%) and enhanced color perception, resolving the contradiction between brightness and color intensity.
2Ease of manufacture
If the mean reflection factor is raised to improve color intensity, then the residual reflection is perceived more strongly, but the luminous reflection factor exceeds the 2.5% threshold for true antireflection
Solution Approach 1:
The invention establishes precise parameter boundaries: mean reflection factor Rm between 0.5% and 2.0%, chroma value C* between 5 and 20, and luminous reflection factor Rv ≤ 2.5%. These controlled parameter ranges ensure that the coating achieves both enhanced color intensity and maintains true antireflection performance, preventing the luminous reflection factor from exceeding the 2.5% threshold while still providing visible color.
3Ease of manufacture
If the chroma value is increased to enhance color perception, then the residual reflection becomes more chromatic, but the distinction between different color intensities becomes difficult
Solution Approach 1:
The invention optimizes the chroma value parameter to a specific range (C* = 5 to 20) that provides sufficient color intensity for visual distinction while maintaining measurability. This controlled chroma range, combined with the mean reflection factor control (0.5% ≤ Rm ≤ 2.0%), creates a balanced state where color perception is enhanced but remains distinguishable and measurable, resolving the difficulty of detecting and measuring color intensity differences.
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 solution allows for clear distinction between high and low intensity residual reflections, enhancing color perception and ensuring that the lenses meet the criteria for true antireflection, with a luminous reflection factor of 2.5% or less, thereby improving the cosmetic effect and wear comfort.
Implementation Method 1
antireflection coatings having a luminous reflection factor Rv≦2.5%
Data Source
AI summary
Each lens of a pair of lenses is provided on at least one of its faces with an antireflection coating having a luminous reflection factor Rv that is 2.5% or less, having residual reflections exhibiting the same perceived color, the hue angle (h) for the antireflection coating of one lens varying by not more than 60° as compared to the antireflection coating of the other lens, and:the antireflection coating of one of the lens having an intensely colored residual reflection, a mean reflection factor Rm1≧1.20% and a chroma value C*1≧15,the antireflection coating of the second lens having a weakly colored residual reflection, a mean reflection factor Rm2≦1.65% and a chroma value C*2≦15, and|Rm1−Rm2|≦2.2% and C*1−C*2>5.The invention can be applied to spectacle glasses.