Light Module With Variable Filter Wheels for Tunable Blue Output
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Solution Overview
Problem
Conventional LARP systems face challenges in varying the blue component of white light without significantly reducing total luminous flux, which affects the lifetime of laser diodes and phosphors due to fixed blue segment sizes and high output operations.
Innovation Solution
A light module with a beam splitting apparatus using two rotatably mounted filter wheels to create variable partial optical paths, allowing for adjustable blue component without increasing laser diode power, by overlapping transmission and reflection regions to optimize luminous flux and extend component lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the size of the blue segment (slot) is increased to maximize blue output, then the blue component in white light is improved, but the total luminous flux is considerably reduced
Solution Approach 1:
The patent applies dynamics by making the blue segment size variable rather than fixed. The slot in the phosphor wheel is configured to be adjustable in size, allowing the system to dynamically optimize the balance between blue component output and total luminous flux based on operational requirements, rather than being constrained by a fixed geometric configuration.
Solution Approach 2:
The patent changes the parameter of the blue segment from a fixed size to a variable size that can be adjusted. By modifying the dimensional parameter of the slot in the phosphor wheel, the system can optimize the blue light output while maintaining adequate total luminous flux, resolving the trade-off between these two parameters.
2Illumination intensity
If the laser diodes are operated with high output (above nominal power) to increase blue component, then the blue light intensity is improved, but the lifetime of laser diodes is reduced
Solution Approach 1:
The patent uses dynamics by implementing a variable blue segment size that allows the system to achieve high blue light intensity without continuously operating laser diodes at high power. The adjustable slot enables the system to optimize blue output through geometric configuration rather than relying solely on high power operation, thereby extending laser diode lifetime.
3Illumination intensity
If the blue segment size is increased to maximize blue output, then the blue component is improved, but less segment region is available for remaining coloration
Solution Approach 1:
The patent resolves this contradiction by making the blue segment size dynamic and adjustable. The variable slot configuration allows the system to adapt the blue segment size according to specific application requirements, providing flexibility in color tuning while maintaining sufficient region for other colorations, unlike fixed-size conventional 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
Enables tunable white light generation with minimal loss in luminous flux, reducing the need for high power pulsing of laser diodes and minimizing thermal damage to phosphors, thus extending their lifespan.
Implementation Method 1
at least one first phosphor which is configured to convert incident excitation radiation to a first conversion radiation
Implementation Method 2
a first rotatably mounted filter wheel is arranged between the source and the first phosphor and has a first transmission region and a first reflection region for the excitation radiation
Data Source
AI summary
A light module includes an excitation radiation source, first phosphor, a beam splitting apparatus configured to generate a first and a second partial optical path, with one of the two partial optical paths comprising the first phosphor and the other one including the excitation radiation, a combining apparatus to merge the first and second paths, and an exit where the radiation from the merged paths can be made available. The apparatus includes a first rotatably mounted filter wheel is arranged between the source and the first phosphor and has a first transmission region and a first reflection region for the excitation radiation, and a second rotatably mounted filter wheel, which has at least one second transmission region and a second reflection region for the excitation radiation.