Multilayer Spectacle Lens Coating for Low-Visibility Reflections
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Solution Overview
Problem
Spectacle lenses often reflect light in a way that makes the reflection visible to others, detracting from their appearance quality.
Innovation Solution
A spectacle lens design with a multilayer film on the object side surface, having specific chromaticity coordinates (0.260 to 0.500 for x and 0.270 to 0.420 for y) and a luminous reflectance Rv of 0.60% or less, mimicking human skin color to reduce visibility of reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multilayer film is provided on the lens substrate to provide optical functions, then the functional performance is improved, but the reflected light becomes more visible and appearance quality deteriorates
Solution Approach 1:
The patent applies color changes by carefully selecting the chromaticity coordinates (x, y) of the multilayer film's reflected light to match human skin tones. This causes the reflection to blend with the wearer's skin color, making it imperceptible to observers while maintaining the optical functions provided by the multilayer structure.
Solution Approach 2:
The patent employs parameter changes by precisely controlling the chromaticity parameters (x-coordinate: 0.260-0.500, y-coordinate: 0.270-0.420) and luminous reflectance (Rv ≤ 0.60%) of the multilayer film. These parameter adjustments transform the reflected light characteristics to achieve skin-tone matching and low visibility.
2Object-generated harmful factors
If the luminous reflectance is reduced to improve appearance quality, then the reflected light becomes less visible, but the optical performance may be compromised
Solution Approach 1:
The patent applies parameter changes by optimizing the luminous reflectance to a specific range (Rv ≤ 0.60%) rather than minimizing it completely. This balanced parameter setting reduces reflected light visibility while preserving sufficient light transmission and optical functionality for the spectacle lens.
Solution Approach 2:
The patent uses composite materials through a multilayer film structure with multiple alternating layers of different refractive indices. This composite structure enables simultaneous achievement of low luminous reflectance, specific chromaticity coordinates, and maintained optical performance through constructive and destructive interference of light waves.
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 design enhances the appearance quality by making the reflection less noticeable, assimilating with the wearer's skin color for improved aesthetics.
Implementation Method 1
a luminous reflectance Rv on the object side surface of the spectacle lens of 0.60% or less
Data Source
Figure 1
AI summary
Provided is a spectacle lens including a lens substrate and a multilayer film located on the object side surface of the lens substrate, the spectacle lens having an x-coordinate in the xy chromaticity diagram of the reflected color on the object side surface of the spectacle lens measured under the CIE standard illuminant D65 in the range of 0.260 to 0.500, a y-coordinate in the range of 0.270 to 0.420 and a luminous reflectance Rv on the object side surface of the spectacle lens of 0.60% or less.