White Light Illumination System Using Beam Splitter and Phosphor Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional white light illumination systems in projectors face issues such as phosphor damage from high power light sources and increased costs due to the need for additional blue light beams to adjust color temperature.
Innovation Solution
A white light illumination system comprising a light source unit, beam splitter unit, phosphor unit, heat dissipation unit, and diffuse reflective unit, where the approximately collimated light beam is split to project onto both the phosphor and diffuse reflective units, forming a combined white light beam, thereby reducing phosphor exposure to high temperatures and eliminating the need for external blue light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high power light source is used to generate white light, then illumination intensity is improved, but phosphor is damaged due to high temperature exposure
Solution Approach 1:
The patent segments the white light generation process into two separate optical paths: one path converts laser light to yellow light via phosphor, and the other path directly transmits blue laser light. This segmentation allows the phosphor to be exposed to reduced laser power, preventing thermal damage while maintaining high overall illumination intensity through combination of both light paths.
Solution Approach 2:
The patent introduces a beam splitter as an intermediary component that divides the high-power laser beam into two separate beams. This intermediary enables the system to manage the high power load by distributing it across different optical paths, with only a portion directed to the phosphor, thereby preventing phosphor damage while preserving the ability to generate high-intensity white light.
2Adaptability or versatility
If additional blue light beam is provided to adjust color temperature, then color temperature adjustment is improved, but cost is increased
Solution Approach 1:
The patent enables the system to self-generate the required blue light component by directly transmitting a portion of the original laser light through the beam splitter without requiring an additional blue light source. This self-service approach achieves color temperature adjustment functionality while avoiding the cost and complexity of adding external blue light generators.
Solution Approach 2:
The patent makes the original laser light source serve multiple functions: it simultaneously provides the pump light for phosphor conversion and the direct blue light component for color temperature adjustment. This multi-functionality eliminates the need for separate blue light sources, reducing system cost and complexity while maintaining adaptability for color temperature control.
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 generates a white light beam for high-power applications while preventing phosphor damage and reducing costs by integrating heat dissipation and utilizing internal light splitting to produce the desired color temperature without external blue light sources.
Implementation Method 1
The approximately collimated light beam can be split by the beam splitter unit, to form first approximately collimated light and second approximately collimated light
Implementation Method 2
A part of the laser excites the phosphor
Implementation Method 3
the heat dissipation unit is disposed on the phosphor unit
Implementation Method 4
the diffuse reflective unit is disposed adjacent to one side of the light source unit
Data Source
AI summary
A white light illumination system is provided, including a light source unit, a beam splitter unit, a phosphor unit, a heat dissipation unit, and a diffuse reflective unit. The light source generating unit can generate an approximately collimated light beam along a predetermined transmission path. The beam splitter unit, the phosphor unit, and the diffuse reflective unit are disposed adjacent to one side of the light source unit. The beam splitter unit is located on the predetermined transmission path. The approximately collimated light beam is projected onto the beam splitter unit. The heat dissipation unit is disposed on the phosphor unit.