Aircraft Stairway Step Lighting With Reflective Riser Illumination
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Solution Overview
Problem
Aircraft entryways lack effective lighting systems to illuminate stair edges, posing safety risks for passengers in dark conditions, as existing technologies do not adequately address the need for clear step edge indication and downward illumination of subsequent steps.
Innovation Solution
A deployable aircraft stairway lighting system featuring embedded LED light sources within translucent lens materials and reflective surfaces to direct illumination upwardly and downwardly, ensuring clear step edge indication and safe navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If no lighting system is installed on the aircraft stairway, then the device complexity is reduced, but the illumination intensity and visibility of stair edges deteriorate, creating safety risks in dark conditions
Solution Approach 1:
The lighting system merges multiple functions into integrated components: LED light sources are embedded within the step structure itself, combining illumination with the stairway architecture. The reflective surfaces are incorporated into the step design, eliminating separate lighting fixtures and reducing overall system complexity while maintaining effective illumination.
Solution Approach 2:
Reflective surfaces act as intermediaries that redirect light from LED sources to illuminate areas that would otherwise remain dark. This intermediary approach allows a single light source to serve multiple illumination purposes, enhancing visibility without requiring additional light sources or complex lighting arrangements.
2Loss of information
If lighting is provided only on the top surface of steps, then the device complexity is reduced, but the clarity of step edge indication deteriorates, making it difficult for passengers to see step boundaries
Solution Approach 1:
The lighting system applies different illumination qualities to different locations: LED light sources are positioned at specific locations on each step (front and rear), and reflective surfaces are strategically placed to highlight step edges. This localized approach ensures that step boundaries are clearly indicated without requiring uniform lighting across all surfaces.
Solution Approach 2:
The system transitions from two-dimensional surface lighting to three-dimensional spatial illumination by embedding light sources within the step structure and using reflective surfaces to redirect light in multiple directions. This creates a volumetric lighting effect that clearly defines step edges and boundaries from multiple viewing angles.
3Illumination intensity
If downward lighting is added to illuminate subsequent steps, then the illumination coverage is improved, but the use of energy increases due to additional light sources
Solution Approach 1:
The reflective surfaces create a feedback mechanism where light directed downward reflects off the step surfaces and redirects illumination back upward and forward. This feedback loop allows a single light source to illuminate multiple steps without requiring proportional increases in energy consumption, as the reflected light continues to serve illumination purposes.
Solution Approach 2:
Each LED light source performs multiple functions simultaneously: it illuminates the immediate step, directs light downward to illuminate subsequent steps, and works with reflective surfaces to provide step edge indication. This multi-functionality reduces the total number of light sources needed, thereby reducing overall energy consumption while maintaining comprehensive illumination coverage.
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 system enhances passenger safety by providing clear illumination of stair edges and subsequent steps, reducing the risk of missteps and improving visibility in dark environments.
Implementation Method 1
one or more first light sources located underneath a first traction-enhancing surface on the first step, the one or more first light sources configured to direct illumination up through one or more strip lenses incorporated into the first traction-enhancing surface
Implementation Method 2
one or more second light sources located underneath a front edge of the first traction-enhancing surface on the first step, the one or more second light sources being configured to direct illumination down onto a reflective face established into a riser existing below the first step, the reflective face being configured to reflect light received from the one or more second light sources and direct the light to illuminate a top surface of the second step
Data Source
AI summary
An entry step lighting system for a deployable aircraft stairway. The system includes steps that having integrated light sources that direct and provide illumination to the steps. Some light sources illuminate strip lenses which indicate proximity to the step edges. Light emitted by a second group of light sources is directed into an angled face established on a riser wall between each step. The light bounces off of each angled face to illuminate the step below.