Multilayer Spectacle Lens Coating for Glare and Ghosting Control
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Solution Overview
Problem
Spectacle lenses often cause discomfort due to glare and ghosting or flare, particularly in evening sunlight, which existing technologies have not adequately addressed.
Innovation Solution
A spectacle lens design featuring multilayer films on both surfaces with specific reflectance values in the 600 to 780 nm wavelength range on the object side and luminous reflectance values on the eyeball side, reducing glare and ghosting/flare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional multilayer films are provided on the lens substrate, then the lens provides basic optical functions, but glare and ghosting/flare occur causing poor wearing comfort
Solution Approach 1:
The patent applies parameter changes by precisely controlling the reflectance values of multilayer films at specific wavelength ranges. The object-side surface is designed with average reflectance of 1.9% or more in the 600-780 nm wavelength region, while the eyeball-side surface is designed with luminous reflectance Rv of 0.60% or less. This parameter optimization resolves the contradiction by minimizing glare and ghosting/flare while maintaining good wearing comfort.
Solution Approach 2:
The patent applies local quality by differentiating the optical properties between the two surfaces of the lens. The object-side surface has higher reflectance (1.9% or more) to control incoming light, while the eyeball-side surface has lower luminous reflectance (0.60% or less) to reduce reflections toward the wearer's eye. This asymmetric local optimization eliminates glare and ghosting/flare while preserving wearing comfort.
2Object-affected harmful factors
If the average reflectance on the object side surface is increased to reduce glare, then glare reduction improves, but the lens may cause other optical issues
Solution Approach 1:
The patent applies parameter changes by setting the average reflectance on the object-side surface to 1.9% or more in the 600-780 nm wavelength region. This specific parameter range is optimized to reduce glare while maintaining stable optical performance, preventing both excessive reflection and insufficient glare reduction.
Solution Approach 2:
The patent applies composite materials through multilayer film structures on both surfaces of the lens substrate. These composite optical structures enable precise control of reflectance properties, achieving glare reduction with stable optical performance by combining multiple layers with different optical characteristics.
3Object-affected harmful factors
If the luminous reflectance on the eyeball side surface is decreased to reduce ghosting and flare, then ghosting and flare are minimized, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by specifying the luminous reflectance Rv on the eyeball-side surface to be 0.60% or less. This parameter control minimizes ghosting and flare while providing clear manufacturing targets for achieving the desired optical performance.
Solution Approach 2:
The patent applies local quality by optimizing the eyeball-side surface with specifically controlled low luminous reflectance (0.60% or less). This localized optical property control reduces ghosting and flare in the critical region where light enters the wearer's eye, with well-defined manufacturing requirements.
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 lens design significantly enhances wearing comfort by minimizing glare and ghosting/flare, especially in evening light conditions.
Implementation Method 1
the spectacle lens having an average reflectance in the wavelength region of 600 to 780 nm on the object side surface of the spectacle lens of 1.9% or more and a luminous reflectance Rv on the eyeball side surface of the spectacle lens of 0.60% or less
Data Source
Figure 1
AI summary
Provided is a spectacle lens comprising a lens substrate and multilayer films respectively located on the object side surface and the eyeball side surface of the lens substrate, the spectacle lens having an average reflectance in the wavelength region of 600 to 780 nm on the object side surface of the spectacle lens of 1.9% or more and a luminous reflectance Rv on the eyeball side surface of the spectacle lens of 0.60% or less.