Laser Protection Eyewear Lenses with Embedded Wavelength Filter
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Solution Overview
Problem
Current laser protective eyewear devices face challenges in enhancing wavelength blocking strength, modifying visual color characteristics, reducing back reflections, lowering production costs, simplifying framing processes, reducing weight, and improving the quality of coated surfaces.
Innovation Solution
The integration of spectrally selective wavelength filters within plastic lens substrates combined with surface-layer filters, which can be either absorptive or multilayer dielectric, to create a combined filter function that reduces back reflections and provides effective laser protection while maintaining high visible light transmission for good color discrimination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If surface-layer filters alone are used for laser protection, then laser wavelength blocking is achieved, but back reflections into the eye from the inside surface of the lens increase
Solution Approach 1:
The filter system is divided into two segments: a substrate filter that provides base laser protection and a surface-layer filter that provides enhanced wavelength-specific blocking. This segmentation allows each filter to be optimized for its specific function while working together to solve both the laser blocking and back reflection problems simultaneously.
Solution Approach 2:
The invention uses a composite filter system combining substrate and surface-layer filters with different spectral characteristics. The substrate filter uses materials optimized for broad spectrum protection while the surface-layer filter uses materials optimized for specific laser wavelength blocking, creating a composite system that addresses multiple requirements.
2Object-affected harmful factors
If multiple filter layers are integrated to enhance blocking strength, then laser protection performance improves, but device complexity and production cost increase
Solution Approach 1:
The complex filter function is segmented between two simpler filters: a substrate filter that provides fundamental protection and a surface-layer filter that provides enhanced wavelength-specific blocking. This segmentation reduces the complexity of each individual filter while achieving the same overall performance as a single complex multi-layer filter would require.
Solution Approach 2:
The invention changes the spectral parameters of the filters by using different materials and layer configurations. The substrate filter uses materials with specific absorption characteristics while the surface-layer filter uses materials with different spectral properties, allowing optimization of blocking strength at specific wavelengths without requiring excessive complexity throughout the entire filter stack.
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 significantly enhances the performance of laser protective eyewear by reducing back reflections, improving visual acuity, and reducing the complexity and cost of filter production, while maintaining high visual clarity and protection against harmful laser radiation.
Implementation Method 1
The integration of spectrally selective wavelength filters within plastic lens substrates combined with surface-layer filters, which can be either absorptive or multilayer dielectric
Implementation Method 2
surface-layer filters, which can be either absorptive or multilayer dielectric
Data Source
AI summary
A laser protection eyewear lens includes a lens substrate comprising an embedded wavelength filter having a first filter function, and a multi-layer dielectric filter applied to at least one of an inside and an outside surface of the lens substrate that comprises a second filter function having at least one center wavelength and bandwidth. The first filter function of the embedded wavelength filter and the second filter function of the multilayer dielectric filter produce a combined filter function that attenuates light reflecting off the multi-layer dielectric filter.