Aircraft Navigation Light Thermal Management and Optical Control
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Solution Overview
Problem
Current aircraft navigation lights struggle to meet regulatory requirements for uniform light distribution and intensity in both horizontal and vertical planes, particularly in directing light to specific angles and reducing heat-related issues in LED components.
Innovation Solution
The design incorporates a planar circuit board with LEDs, a reflector-shade to direct light, and a light transmissive cover with a lenticular lens to achieve desired light patterns, along with a heat conductive material and temperature-controlled LED current regulation to ensure optimal performance and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LEDs are used to reduce power consumption and increase longevity, then energy efficiency and lifespan are improved, but heat generation in compact spaces causes thermal management issues
Solution Approach 1:
A heat conductive material is introduced as an intermediary between the circuit board and base to facilitate heat transfer from the LEDs to the base, which acts as a heat sink. This mediator enables efficient thermal management without requiring active cooling systems.
Solution Approach 2:
The patent extends heat dissipation from a two-dimensional surface to a three-dimensional structure by using the base as a volumetric heat sink. The heat conductive material creates a thermal pathway that distributes heat throughout the base structure, increasing the effective heat dissipation volume.
2Manufacturing precision
If a reflector-shade is added to direct light in specific directions, then light distribution compliance is improved, but device complexity increases
Solution Approach 1:
The reflector and shade functions are merged into a single integrated component. The reflector-shade combines light-reflecting surfaces with light-blocking sections in one piece, eliminating the need for separate reflector and shade components while achieving the same optical control.
Solution Approach 2:
The reflector-shade component performs multiple functions simultaneously: it reflects light in desired directions, blocks light in undesired directions, and contributes to the overall structural housing of the navigation light assembly.
3Illumination intensity
If a lenticular lens is incorporated to direct light at specific angles, then visibility in specific directions is improved, but manufacturing complexity increases
Solution Approach 1:
Complex mechanical light redirection structures are replaced with an optically engineered lenticular lens. The lens uses precise surface geometry rather than mechanical adjustment mechanisms to achieve the desired light distribution pattern.
4Illumination intensity
If multiple LEDs are mounted on a circuit board to provide sufficient light intensity, then illumination requirements are met, but heat generation and thermal management become more difficult
Solution Approach 1:
The circuit board is divided into multiple mounting locations for individual LEDs, allowing heat to be distributed across multiple small heat sources rather than concentrated in a single high-power source. Each LED generates less heat individually, and the heat conductive material distributes this heat across the base structure.
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 ensures compliance with aviation standards for light distribution, enhances visibility, and extends the lifespan of navigation lights by managing heat effectively.
Implementation Method 1
a heat conductive material between the circuit board and the base
Implementation Method 2
A reflector-shade sits adjacent the LEDs and is adapted to reflect light from the LEDs in desired directions
Implementation Method 3
the light transmissive cover includes a lenticular lens to direct the light from the LEDs in specific directions and at specific angles
Implementation Method 4
an inert atmosphere inside the space formed between the base and light transmissive cover
Data Source
AI summary
An aircraft navigation light comprises a base and circuit board in thermal contact with the base. White and colored LEDs mount on the circuit board. A reflector-shade placed adjacent the LEDs reflects light from the LEDs in desired directions and shades other directions from view of selected LEDs. A light transmissive cover sealed to the base, encloses the circuit board, LEDs and reflector-shade. Temperature responsive circuitry on the circuit board regulates the current through the LEDs and reduces the LED current under high temperature conditions.