Aircraft Headlight Parabolic Reflector Stray Light Management
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Solution Overview
Problem
Aircraft headlight systems face issues with stray light generation due to the close packing of parabolic reflectors, leading to deviations from the parabolic shape at reflector contact sections, which results in undesired light distribution and potential blinding of pilots by reflected stray light.
Innovation Solution
The design incorporates a combination of parabolic and non-parabolic reflector contact sections in adjacent lighting arrangements, allowing for dense packing while minimizing stray light emission by adjusting the geometry of non-parabolic sections to direct stray light away from undesirable directions, such as the upper hemisphere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If lighting arrangements are arranged very closely to use available space efficiently, then space utilization is improved, but stray light is generated due to reflector shape deviations at contact sections
Solution Approach 1:
The reflector is designed with different surface properties in different regions: the contact section has a modified geometry (planar or convex) to prevent stray light generation, while the non-contact sections maintain the parabolic shape for optimal light collimation. This local differentiation allows the reflector to simultaneously achieve dense packing without stray light and maintain lighting performance.
Solution Approach 2:
The reflector surface is segmented into functionally distinct zones: contact sections where reflectors meet adjacent units and non-contact sections. Each segment serves its specific purpose - contact sections are optimized for preventing stray light while non-contact sections maintain collimation performance, allowing the overall system to achieve both dense packing and reduced stray light.
2Area of stationary object
If reflector contact sections are made non-parabolic to accommodate adjacent reflectors, then dense packing is achieved, but light collimation performance deteriorates
Solution Approach 1:
The reflector design applies different geometric qualities to different regions: contact sections use planar or convex surfaces to enable dense packing, while non-contact sections maintain the parabolic shape for optimal light collimation. This local differentiation ensures that the compromise in shape is confined only to necessary contact areas.
Solution Approach 2:
The potential harm of having to modify reflector shapes for packing is converted into a benefit by strategically placing the modifications only in contact sections. The non-contact sections retain full parabolic performance, and the contact section modifications actually help define precise boundaries between adjacent reflectors, improving overall system organization.
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 configuration effectively reduces stray light in undesirable directions, enhancing pilot visibility and aircraft safety by minimizing reflections from clouds or fog while maintaining a dense and efficient lighting arrangement.
Implementation Method 1
Aircraft head lights, as they are employed in airplanes and helicopters, may comprise a plurality of lighting arrangements, each of said lighting arrangements comprising a reflector, in particular a reflector having a parabolic shape. With the parabolic reflectors, a strong collimation of light is achieved for providing a bright illumination in a desired direction.
Implementation Method 2
the reflector contact section of the generally parabolic reflector of the second lighting arrangement is non-parabolic... The non-parabolic reflector contact section is a portion of the generally parabolic reflector that is modified as compared to a fully parabolic reflector... to direct stray light away from undesirable directions
Data Source
AI summary
An aircraft head light comprises: a plurality of lighting arrangements, each lighting arrangement comprising a light source and a generally parabolic reflector surrounding the respective light source. The plurality of lighting arrangements are arranged in a side-by-side relationship, with the generally parabolic reflectors of adjacent lighting arrangements having respective reflector contact sections. For at least one adjacent pair of the plurality of lighting arrangements, said adjacent pair comprising a first lighting arrangement and a second lighting arrangement the reflector contact section of the generally parabolic reflector of the first lighting arrangement is parabolic and the reflector contact section of the generally parabolic reflector of the second lighting arrangement is non-parabolic.