LED Luminaire Collimation and Homogenization System
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Solution Overview
Problem
Existing LED luminaires face challenges in achieving uniform color mixing and beam homogenization due to physical separation and differing optical properties of colored LEDs, leading to color fringing and inadequate beam collimation, which limits zoom range and introduces aberrations.
Innovation Solution
An optical system comprising a collimating and mixing optic with curved sides and a light integrator using total internal reflection, which aligns LED dies with the optic's sides for improved light mixing, followed by a lens system for adjustable beam angle control, ensuring uniform color mixing and beam collimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical separation between different colored LED dies is used, then individual color beam control is improved, but color mixing homogeneity deteriorates
Solution Approach 1:
A light integrator is introduced as an intermediary component between the physically separated LED dies and the output beam. This light integrator mixes the light from different colored LEDs before output, ensuring homogeneous color mixing while maintaining the physical separation needed for individual color control.
Solution Approach 2:
The optical system is segmented into distinct functional zones: a collimation zone with individual optics for each LED die to control color beams, and a mixing zone with a light integrator to homogenize the combined light. This segmentation allows simultaneous optimization of both color control and mixing homogeneity.
2Measurement precision
If different optical devices are used for each LED package, then individual beam shape control is improved, but chromatic aberration increases
Solution Approach 1:
The optical system applies different optical properties to different spatial locations: collimation optics with color-corrected surfaces are positioned close to each LED die for localized beam control, while the light integrator provides uniform mixing. This local optimization reduces chromatic aberration while maintaining beam shape control.
3Productivity
If conventional optical systems are used, then basic beam production is achieved, but zoom range is limited
Solution Approach 1:
The system incorporates movable optical elements that can be dynamically adjusted along the optical axis to change the beam angle. This dynamic adjustment capability provides a wide zoom range while maintaining efficient beam production through the optimized light path design.
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 solution provides enhanced color homogenization, improved beam collimation, and a wider zoom range with minimal chromatic aberration, resulting in a uniformly colored output beam with adjustable angle control.
Implementation Method 1
a light integrator using total internal reflection, which aligns LED dies with the optic's sides for improved light mixing
Data Source
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AI summary
Disclosed is an LED light source (60) automated luminaire with a multi sided elongated light integrator (102) with receiving lens (130) and output lens (132) both with spill shields (131,133) and where the receiving spill shield (131) is nesting in the output spill shield (133). The elongated integrator (102) has a square input cross-section (106) and a hexagon or octagon output cross section (108) and is tapered so that the input cross section (106) is smaller than the output cross section (108).