LED Luminaire Collimation System with Central Light Blockers
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Solution Overview
Problem
High power LEDs in luminaires suffer from spill light and color fringing due to differing optical properties and construction, leading to uneven illumination and aberrations in the output beam.
Innovation Solution
The implementation of a collimation system comprising primary optics with central spill light blockers and adjustable small louver masks to control the beam angle and reduce stray light, ensuring more light is within the desired beam angle and minimizing color fringing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If lenses or optical devices are used in front of each LED to control beam shape and angle, then beam control is improved, but color fringing and aberrations worsen due to differing effects on different colors
Solution Approach 1:
The patent divides the optical control function into multiple components: a common lens for all LEDs, individual color filters for each LED, and adjustable louver masks. This segmentation allows each component to handle specific aspects of beam control and color management separately, preventing the color fringing that occurs when a single optical device tries to control all colors simultaneously.
Solution Approach 2:
The patent applies different optical treatments to different parts of the system: a common lens for all LEDs, individual color filters for each LED wavelength, and adjustable louver masks positioned at specific locations. This local differentiation ensures that each LED's light is treated according to its specific color properties, eliminating the color fringing caused by uniform optical treatment.
2Object-generated harmful factors
If physical separation between LEDs is increased to reduce color mixing issues, then color fringing is reduced, but spill light increases and beam control deteriorates
Solution Approach 1:
The patent introduces color filters as intermediary elements between each LED and the output. These filters act as mediators that allow each LED to maintain its physical separation while still producing a unified color output. The filters ensure that only the appropriate wavelengths pass through, preventing both color fringing and spill light by controlling the spectral composition of each LED's contribution to the final beam.
3Device complexity
If a common lens is used for all LEDs to simplify the system, then device complexity is reduced, but beam angle control and color homogeneity worsen due to differing optical properties of different colors
Solution Approach 1:
The patent makes the common lens multi-functional by designing it to handle collimation for all LEDs regardless of color, while individual color filters handle the wavelength-specific optimization. This universal lens approach simplifies the system compared to having separate lenses for each LED, while the added color filters maintain color homogeneity by ensuring each LED contributes only its appropriate wavelength range to the final beam.
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 solution effectively reduces spill light and color fringing, providing a well-controlled and defined beam with improved color homogeneity and beam angle control, enhancing the overall lighting performance.
Implementation Method 1
adjustable small louver masks to control the beam angle and reduce stray light
Implementation Method 2
collimation system comprising primary optics with central spill light blockers
Data Source
AI summary
An automated luminaire with an array of light sources configured in a plurality of primary TIR optics with central light blocks. The light blocks are configured to block or redirect light beam at angles likely to cause undesirable light spill.