Curved Automatic Darkening Filter with Switchable Shutter Array
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Solution Overview
Problem
Current protective headgear fails to effectively manage high-intensity light exposure, particularly in industrial settings, as it either over-darkens the entire field of view or lacks precise control over light transmission, leading to reduced visibility and inadequate protection for the entire eye surface.
Innovation Solution
A vision-protective headgear with a curved automatic darkening filter featuring an array of switchable shutters, controlled by a shutter control system that uses workview light intensity mapping and eye position monitoring to selectively switch shutters between light, dark, and intermediate states, ensuring optimal light management and protection from high-intensity light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single automatic darkening filter is used in protective headgear, then protection from high-intensity light is provided, but the entire field of view is over-darkened reducing visibility
Solution Approach 1:
The filter is divided into an array of multiple independently controllable shutter elements arranged in a grid pattern. Each shutter element can be individually darkened or lightened based on the intensity of light in its specific region, allowing selective protection without over-darkening the entire field of view. This segmentation enables precise control of light transmission to different areas of the wearer's vision.
Solution Approach 2:
Different regions of the filter have different optical properties - some shutter elements are darkened to block high-intensity light sources while others remain light to maintain visibility in normal lighting conditions. The system adjusts the optical state of each local region independently based on local light intensity measurements, providing tailored protection and visibility optimization for each area.
2Object-affected harmful factors
If the entire filter is darkened to protect from high-intensity light, then eye protection is improved, but peripheral visibility is reduced
Solution Approach 1:
The filter array comprises multiple independently controllable shutter elements that can be selectively activated. When a high-intensity light source is detected in a specific region, only the corresponding shutter elements in that region are darkened, while other elements remain light to maintain peripheral visibility. This localized response protects the eye from harmful light without sacrificing overall situational awareness.
Solution Approach 2:
The shutter elements dynamically adjust their optical state in real-time based on changing light conditions. The system continuously monitors light intensity across the field of view and rapidly switches individual shutter elements between light and dark states as needed, providing adaptive protection that responds to moving light sources and changing environmental conditions while maintaining optimal visibility.
3Measurement precision
If an array of switchable shutters is implemented, then precise light control is achieved, but device complexity increases
Solution Approach 1:
The filter is segmented into an array of shutter elements that can be controlled in groups or individually based on the spatial distribution of light sources. This segmentation provides precise control over light transmission to different regions of the field of view. The modular array structure allows for scalable implementation where the number of elements can be adjusted based on the specific application requirements.
Solution Approach 2:
The same array of shutter elements serves multiple functions: protecting from high-intensity light sources, maintaining visibility in normal conditions, and providing adjustable optical density. The system can operate in different modes (e.g., individual element control, regional control, or global control) depending on the lighting conditions and user needs, making the complex structure versatile and adaptable to various welding and industrial applications.
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 solution provides enhanced visibility by selectively darkening only the necessary areas, minimizing high-intensity light entry while protecting the entire eye surface, thus preventing photokeratitis and actinic conjunctivitis, and maintaining improved visibility of peripheral locations.
Implementation Method 1
each element of the array being switchable between a light state and a dark state
Implementation Method 2
a curved automatic darkening filter comprising an array of switchable shutters
Data Source
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AI summary
Protective headgear including an automatic darkening filter with an array of switchable shutters, and including a shutter control system, at least one workview image acquisition device, and at least one eye position monitoring device, wherein the shutter control system is controllably connected to each switchable shutter of the array of switchable shutters so as to control the switching of each of the switchable shutters, and is receivably connected to the at least one workview image acquisition device and to the at least one eye position monitoring device.