Phosphoric Substrate Laser White Light for Emergency Lighting
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Solution Overview
Problem
Current emergency lighting systems, including incandescent and LED-based systems, suffer from inefficiency and inadequate light distribution, leading to short operating durations and safety hazards, while laser diode systems are not well-suited for low-level, wide-area lighting due to efficiency limitations and the need for complex optical systems.
Innovation Solution
A laser diode system coupled with a collimator and a phosphoric substrate, optionally including a diffraction grating, which eliminates the need for lenses or reflectors, providing a bell-shaped Gaussian light distribution and efficient white light generation without excessive power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED-based systems with multiple LEDs and plastic lens systems are used, then white light is generated, but the light distribution becomes much narrower Gaussian than desired and power consumption is high
Solution Approach 1:
The patent removes the plastic lens system entirely from the LED-based white light generation system. By extracting this optical component, the system eliminates the narrow Gaussian light distribution problem and reduces power consumption associated with driving multiple LEDs through complex optical paths.
Solution Approach 2:
The invention changes the fundamental parameters of the light source by transitioning from multiple LEDs with plastic lenses to a single laser diode without optical components. This parameter change enables broader light distribution and lower power consumption while maintaining white light output.
2Illumination intensity
If laser diodes with lens or reflector systems are used, then white light is generated, but system losses increase and safety hazards arise if container is damaged
Solution Approach 1:
The patent extracts and removes the lens or reflector system from the laser diode configuration. This elimination of optical components directly reduces system losses and removes the safety hazard associated with fragile optical elements that could break and cause injury.
Solution Approach 2:
The invention uses the phosphorous substrate as an intermediary medium that converts laser light to white light without requiring additional optical components like lenses or reflectors. This intermediary approach eliminates system losses and safety hazards while achieving the desired white light output.
3Illumination intensity
If laser diodes with lens or reflector systems are used, then white light is generated, but manufacturing time and expenses increase
Solution Approach 1:
By removing the lens or reflector system from the laser diode assembly, the patent significantly simplifies the manufacturing process. Fewer components mean reduced assembly time, lower material costs, and easier production scaling.
Solution Approach 2:
The invention merges the functions of the laser diode and phosphorous substrate into a single integrated unit without intermediate optical components. This consolidation reduces manufacturing complexity, time, and expenses while maintaining effective white light generation.
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 achieves high efficiency and extended operating duration by producing white light in a bell-shaped Gaussian curve, reducing system losses and manufacturing costs, while ensuring thermal management and safety through a simplified design.
Implementation Method 1
a laser beam source comprising a laser diode positioned at a distance from a substrate and directed at the substrate to penetrate the substrate and generate the perceived white light
Implementation Method 2
In an exemplary embodiment, a diffraction grating is positioned between the collimator and the phosphoric substrate
Data Source
AI summary
A system and method of generating perceived white light by laser. The system comprises a laser, a phosphoric substrate, and optionally a diffraction grating. In one embodiment, a blue laser beam from the laser penetrates the phosphoric substrate to create perceived white light in a Gaussian distribution appropriate for emergency lighting. In another embodiment, the blue laser beam is split into multiple beams by the diffraction grating. The multiple beams penetrate the phosphoric substrate to create perceived white light in a Gaussian distribution appropriate for emergency lighting.