LED Luminaire Beam Control via Micro Lens Arrays and Louver Masks
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Solution Overview
Problem
High power LED luminaires face issues with spill light and color fringing due to physical separation and differing optical properties of LEDs, which affect the beam angle and color consistency of the output beam.
Innovation Solution
A beam control system utilizing micro lens arrays and adjustable louver masks to control the beam angle and reduce stray light, allowing for remote variable control and improved beam shape and color homogeneity, with the louver masks providing mechanical protection and dust exclusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If physical separation between LEDs of different colors is used, then color mixing capability is improved, but spill light and color fringing increase
Solution Approach 1:
A color correction lens is introduced as an intermediary optical element between the separately arranged LEDs of different colors and the output beam. This lens corrects the color fringing and spill light caused by the physical separation, allowing the LEDs to be spaced farther apart for better color mixing control while maintaining beam quality.
Solution Approach 2:
The color correction lens applies different local optical properties to different regions of the beam. By having varying refractive indices or optical powers across the lens surface, it compensates for the color-specific deviations caused by LED separation, allowing each color channel to be properly aligned in the final beam.
2Ease of operation
If zoom lens or optical device is used for each LED, then beam shape and angle control is improved, but device complexity and cost increase
Solution Approach 1:
Multiple optical functions (beam shaping, angle control, and color correction) are merged into a single color correction lens. This unified optical element performs what would otherwise require separate zoom lenses or optical devices for each LED, reducing overall system complexity while maintaining full control capability.
Solution Approach 2:
The color correction lens is designed to serve multiple functions simultaneously: it corrects color fringing, controls beam angle, and shapes the output beam. This multi-functional approach eliminates the need for separate optical devices for each function, simplifying the overall system.
3Adaptability or versatility
If LEDs are arranged in array with physical separation, then color gamut and mixing control are improved, but beam homogeneity deteriorates
Solution Approach 1:
The color correction lens acts as a mediator that reconciles the conflict between LED separation (needed for color control) and beam homogeneity. It optically recombines the separated color beams into a homogeneous output while preserving the ability to independently control each color channel for gamut optimization.
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 effectively reduces spill light and color fringing, enabling precise control over the beam angle and color output, resulting in a well-defined and homogeneous beam with improved color mixing and reduced aberrations.
Implementation Method 1
A beam control system utilizing micro lens arrays and adjustable louver masks to control the beam angle
Implementation Method 2
adjustable louver masks to control the beam angle and reduce stray light
Data Source
AI summary
Described are an improved automated multi source luminaire and luminaire systems. More particularly a multicolor LED array luminaire system with a series of lenses and light louvers to control the light beam.