Laser Protection Eyewear with Multilayer Interference Coating
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Solution Overview
Problem
Conventional laser safety eyewear blocks a wide bandwidth of visible light, causing significant reduction in vision and color discrimination, and is not designed for long-term wearability or style, while existing military-grade solutions are costly and not suitable for consumer markets.
Innovation Solution
Development of consumer-grade laser protection eyewear with multilayer notch and edge filters that block specific wavelengths of light from handheld and portable laser devices, maintaining visibility and color balance, and providing comfort and practicality for long-term wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional laser safety eyewear blocks a wide bandwidth of visible light, then laser protection is improved, but vision and color discrimination are significantly reduced
Solution Approach 1:
The filter is divided into multiple spectral regions: a narrow blocking band at the laser wavelength (532 nm green) and broader blocking bands in the ultraviolet and infrared regions. This segmentation allows the eyewear to block harmful laser radiation while preserving visible light transmission for normal vision.
Solution Approach 2:
The optical filter exhibits different transmission properties at different wavelengths: high transmission in the visible spectrum (400-700 nm) for maintaining vision quality, strong absorption at the specific laser wavelength (532 nm), and selective blocking in UV and IR regions. This local differentiation of filter properties resolves the contradiction between protection and visibility.
2Reliability
If conventional laser safety eyewear blocks a wide bandwidth of visible light, then laser protection is improved, but color discrimination is significantly reduced
Solution Approach 1:
The spectral filter profile is segmented to block only specific harmful wavelengths (laser line at 532 nm, UV, and IR) while leaving the visible spectrum largely intact. This selective segmentation preserves color information transmission unlike broad-band blocking filters.
Solution Approach 2:
The filter provides wavelength-dependent transmission with high transmission in the visible range where color discrimination occurs, and strong absorption only at the laser wavelength and outside the visible spectrum. This local quality differentiation maintains color discrimination while providing laser protection.
3Reliability
If conventional laser safety eyewear is designed for short-term use in controlled environments, then laser protection is achieved, but comfort and style are compromised
Solution Approach 1:
The eyewear combines laser protection with features suitable for long-term wear including anti-glare coating, UV protection, and stylish design. The frame structure incorporates adjustable nose pads and temple arms for comfort, making it suitable for both protected and unprotected environments.
Solution Approach 2:
The optical filter parameters are optimized to transmit visible light with minimal distortion while blocking laser wavelengths, creating a balance between protection and visual comfort. The frame parameters (weight, fit, materials) are also optimized for extended wearability.
4Reliability
If military-grade laser protection eyewear is used, then comprehensive laser protection is achieved, but cost increases significantly
Solution Approach 1:
The patent employs cost-effective optical coating techniques and frame materials that provide sufficient laser protection without the extreme cost of military-grade solutions. The design prioritizes essential protection features while using affordable manufacturing processes suitable for consumer markets.
Solution Approach 2:
The optical filter parameters are optimized to provide adequate protection for consumer laser devices (typically <5 mW) without requiring the over-engineered specifications of military-grade eyewear. This parameter optimization reduces manufacturing cost while maintaining sufficient protection for the target application.
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 eyewear effectively blocks laser light from various angles and wavelengths, ensuring eye safety without impairing color discrimination or vision, and is designed for long-term wearability with features like anti-glare and sun protection.
Implementation Method 1
The spectral filter profile includes a narrow band blocking region centered at a wavelength of the laser light
Implementation Method 2
The known laser safety eyewear used for these applications typically block a much wider bandwidth than necessary
Data Source
AI summary
A laser protection lens include an optically transparent material having a perimeter shape that follows a contour of a user's eye socket ridge, a horizontal shape, and a vertical shape. A multilayer interference coating is applied to at least one of an inside and outside surface of the optically transparent material. The multilayer interference coating has at least a 20 dB reduction of optical transmission for at least one of 445 nm, 532 nm, and 610 nm wavelengths and has at least 10 dB optical reduction over a wavelength band from at least one of 445 nm to the ultraviolet region and 610 nm the infrared region.