Spectacle Lens Multilayer Films for Infrared and UV Control
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Solution Overview
Problem
Existing spectacle lens designs fail to effectively suppress reflection of ultraviolet light on the eyeball-side surface while maintaining infrared and ultraviolet light reduction functions.
Innovation Solution
A spectacle lens design with multilayer films on both surfaces, where the infrared cut function is reduced by one step on the eyeball-side surface and low ultraviolet reflection is imparted, achieving a mean reflectance of 5.0% or less in the 315 to 400 nm wavelength band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a multilayer film is formed on the eyeball-side surface with high infrared cut function, then the infrared reduction function is improved, but the ultraviolet light reflection is increased
Solution Approach 1:
The patent applies different reflectance characteristics to different wavelength regions on the eyeball-side surface. The multilayer film is designed to have low reflectance specifically in the ultraviolet region (315-400 nm) while maintaining appropriate infrared reduction, creating localized optical properties tailored to different spectral regions rather than uniform characteristics across all wavelengths.
Solution Approach 2:
The patent changes the optical parameters of the multilayer film by controlling the reflectance ratio in the infrared region (800-1400 nm) to be within 0.2-0.8 and the mean reflectance in the ultraviolet region (315-400 nm) to be 5.0% or less. These parameter specifications allow the film to simultaneously achieve infrared reduction while suppressing ultraviolet reflection, resolving the contradiction between the two functions.
2Object-affected harmful factors
If the multilayer film structure is optimized for infrared cut function, then the infrared reduction performance is improved, but the overall light reflection increases
Solution Approach 1:
The patent specifies that the ratio of mean reflectance on the eyeball-side surface to mean reflectance on the object-side surface in the infrared region (800-1400 nm) should be 0.2-0.8. This parameter control ensures that while infrared reduction is achieved, the overall light reflection is kept within acceptable limits, preventing excessive energy loss.
Solution Approach 2:
The multilayer film is designed with specific reflectance characteristics for different wavelength regions: low reflectance in ultraviolet (315-400 nm), controlled reflectance ratio in infrared (800-1400 nm), and optimized performance in visible light regions. This localized optimization allows infrared reduction without causing excessive overall reflection.
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
Ensures effective infrared cut function and low ultraviolet reflection on the eyeball-side surface, reducing glare and enhancing visual inspection accuracy by generating green interference light, while maintaining a total luminous reflectance of 3.0% or less.
Implementation Method 1
a mean reflectance on the eyeball-side surface in a wavelength band of 315 to 400 nm is 5.0% or less
Implementation Method 2
a reduction ratio of light in a wavelength band of 800 to 1400 nm in the spectacle lens is 45.0% or more
Implementation Method 3
enhancing visual inspection accuracy by generating green interference light
Data Source
AI summary
Provided is a spectacle lens including multilayer films on an object-side surface and an eyeball-side surface of a lens substrate, in which a reduction ratio of light in a wavelength band of 800 to 1400 nm in the spectacle lens is 45.0% or more, a ratio of a mean reflectance on the eyeball-side surface of the spectacle lens to a mean reflectance on the object-side surface of the spectacle lens is 0.2 to 0.8 in the wavelength band, and a mean reflectance on the eyeball-side surface in a wavelength band of 315 to 400 nm is 5.0% or less.