Carbon-Porous Spectacle Lens Coating for Low Reflection and Dust
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Spectacle lenses often suffer from issues of dust adhesion due to static electricity and reflect light from screens, making them difficult to handle and affecting appearance quality, especially in online conferences.
Innovation Solution
A spectacle lens with a multilayer film containing a carbon-containing porous layer on at least one surface, controlling reflectance to reduce light reflection and electrostatic charging, with specific reflectance and carbon content specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a multilayer film is provided on the lens substrate to reduce light reflection, then appearance quality is improved, but the device complexity increases
Solution Approach 1:
The patent employs a porous low-refractive index layer within the multilayer film structure. This porous layer has a refractive index of 1.30 or less, which is lower than conventional solid low-refractive index layers. The porous structure allows for better refractive index matching between layers, reducing optical interference and improving overall anti-reflection performance while maintaining a manageable layer configuration
Solution Approach 2:
The patent optimizes specific parameters of the multilayer film including the refractive index of each layer (high-refractive index layers with n≥2.0, low-refractive index layers with n≤1.30), layer thicknesses (each layer 50-500 nm), and the number of layers (3-10 layers total). By controlling these parameters within specific ranges, the patent achieves minimal light reflection across the visible spectrum while avoiding excessive structural complexity
2Illumination intensity
If a conventional multilayer film is used to control reflectance, then appearance quality is improved, but dust adhesion due to static electricity increases
Solution Approach 1:
The porous low-refractive index layer inherently possesses lower electrostatic charge accumulation due to its porous structure. The voids and surface area characteristics of the porous material reduce triboelectric effects and charge buildup, thereby minimizing static electricity that would otherwise attract dust particles to the lens surface
Solution Approach 2:
The patent creates a composite multilayer film structure combining high-refractive index materials (such as TiO2, ZrO2, HfO2) with a porous low-refractive index material. This composite structure achieves both optical functions (light reflection control) and electrostatic properties (reduced charge accumulation) through the synergistic combination of different material characteristics
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 minimizes screen reflection and dust adhesion, enhancing handling ease and appearance quality, particularly in camera images and reducing electrostatic charging.
Implementation Method 1
a spectacle lens provided with a multilayer film including a porous layer containing carbon (also referred to as a 'carbon-containing porous layer') has a low surface resistivity and is less likely to become electrostatically charged
Implementation Method 2
by providing a multilayer film including a porous layer containing carbon on the surface of a lens substrate and controlling the reflection characteristics of the spectacle lens surface
Data Source
AI summary
Provided is a spectacle lens including a lens substrate, and a multilayer film located on at least one surface of the lens substrate, in which the multilayer film includes one or more porous layers, the porous layer including carbon, in a case where the multilayer film is located on an object-side surface of the lens substrate, an average reflectance of the object-side surface of the spectacle lens in a wavelength region of 400 to 700 nm is 0.500% or less, and in a case where the multilayer film is located on an eyeball-side surface of the lens substrate, an average reflectance of the eyeball-side surface of the spectacle lens in a wavelength region of 350 to 700 nm is 0.800% or less.