LED PAPI Cylindrical Optics Brightness Heat Dissipation
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Solution Overview
Problem
Current Precision Approach Path Indicator (PAPI) systems face limitations in brightness and heat dissipation due to their two-dimensional optical geometry, which restricts the number and intensity of Light Emitting Diodes (LEDs) that can be used, and are challenging to cool effectively.
Innovation Solution
The use of a cylindrical lens with a single mirror and linear arrays of white and red LEDs, allowing for increased brightness and improved heat dissipation by spreading LEDs out along the axis of the cylindrical lens, enabling scalable brightness and efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a two-dimensional array of LEDs is used to increase brightness, then the total light output increases, but heat dissipation becomes difficult and local heat accumulates
Solution Approach 1:
The patent transitions from a two-dimensional LED array to a three-dimensional configuration where LEDs are distributed along a linear path in space. This dimensional change allows heat to dissipate in multiple directions rather than accumulating in a planar configuration, resolving the contradiction between brightness and heat dissipation.
Solution Approach 2:
The LED array is segmented into multiple discrete LED elements distributed along a linear path rather than concentrated in a single planar array. This segmentation allows each LED to have its own heat dissipation zone, preventing local heat accumulation while maintaining total light output.
2Illumination intensity
If more LEDs are placed in a compact two-dimensional array to increase intensity, then brightness increases, but the area for heat sink placement is reduced
Solution Approach 1:
The patent distributes LEDs along a linear path in three-dimensional space rather than confining them to a two-dimensional plane. This allows the heat sink to extend along the linear path, providing sufficient surface area for heat dissipation while maintaining high light intensity through the distributed LED configuration.
Solution Approach 2:
The patent changes the geometric parameters of the LED arrangement from a compact two-dimensional grid to an extended one-dimensional linear distribution. This parameter change increases the effective heat sink surface area available per LED while maintaining the total number of LEDs required for high intensity output.
3Device complexity
If a standard lens with equal optical power in both axes is used, then the optical system is simple, but the light source area is severely limited and LED intensity is restricted
Solution Approach 1:
The patent segments the optical system into distinct functional components: cylindrical lenses for beam shaping in one dimension and linear mirrors for beam redirection. This segmentation allows each component to be optimized for its specific function, enabling higher LED intensity while maintaining manageable system complexity through modular design.
Solution Approach 2:
The patent introduces cylindrical lenses that provide different optical power in different dimensions, and uses linear mirrors to redirect light paths. This dimensional differentiation in the optical system allows for greater flexibility in arranging high-intensity LED sources without the constraints of isotropic lens designs.
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 design enhances brightness by up to 10 times, reduces electrical consumption by 90%, and provides superior reliability and cooling efficiency, addressing the limitations of traditional two-dimensional array designs.
Implementation Method 1
Cylindrical lenses are used in combination with rows of white and red light emitting diodes to provide approach path indications
Implementation Method 2
The incorporation of a cylindrical optical system with a sector delineating mask at the back focal point of the cylindrical lens into the general functional design of a PAPI optical system
Implementation Method 3
rows of white and red Light Emitting Diodes (LED's) to provide approach path indications
Data Source
AI summary
Overcoming limitation in brightness and heating effects for LED based Precision Approach Path Indicators and allowing both colors to be imaged in the far field with the proper abrupt transition between the red and white sectors, making use of linear arrays of LED's and cylindrical optics.