Beam Splitting Filter Illumination System for Laser Projectors
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Solution Overview
Problem
Current laser projector systems experience excessive blue light loss due to a lengthy optical path, which is exacerbated by the need for additional beam splitting rotating elements to bypass the wavelength conversion wheel, increasing costs and complexity in synchronous control.
Innovation Solution
An illumination system incorporating a beam splitting filter device with both light penetration and beam splitting filter regions, allowing the excitation beam to diverge into different paths, thereby avoiding unnecessary transmission to the wavelength conversion element and integrating both beam splitting and filtering functions within a single device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the blue laser beam is transmitted to the wavelength conversion wheel first and then redirected to the filter color wheel, then the optical path can accommodate wavelength conversion, but the optical path becomes too long causing blue light loss
Solution Approach 1:
The patent employs a dynamic beam switching mechanism using a first beam switching element that can redirect the blue laser beam between different optical paths based on operational requirements. This dynamic switching allows the system to bypass the wavelength conversion wheel when blue light is needed, shortening the optical path and reducing blue light loss, while still enabling wavelength conversion when other colors are required.
Solution Approach 2:
The optical system is segmented into multiple independent paths: one path through the wavelength conversion wheel for generating yellow-green light, and another direct path to the filter color wheel for blue light. The beam switching element divides and directs the blue laser beam to appropriate segments based on the desired output color, avoiding unnecessary traversal through the entire wavelength conversion path.
2Loss of energy
If additional beam splitting rotating elements are added to enable different beam paths at different timings, then the optical path can be optimized, but the cost increases and synchronous control complexity increases
Solution Approach 1:
The patent combines the beam switching function with the existing wavelength conversion wheel structure. The first beam switching element works in coordination with the rotating wavelength conversion wheel and filter color wheel, merging multiple control functions into a synchronized system that shares a common rotational reference, thereby reducing the need for entirely independent control systems for each component.
Solution Approach 2:
The wavelength conversion wheel serves multiple functions: it acts as both a wavelength conversion element for generating yellow-green light and as a beam routing element that works in conjunction with the filter color wheel to produce red light. This multi-functionality reduces the need for separate dedicated components for each color generation path.
3Length of moving object
If the blue laser beam travels through different beam paths at different timings, then the optical path length is reduced, but additional beam splitting rotating elements are required
Solution Approach 1:
A dynamic beam switching mechanism using a first beam switching element that can redirect the blue laser beam between different optical paths based on operational requirements. This dynamic switching allows the system to bypass the wavelength conversion wheel when blue light is needed, shortening the optical path and reducing blue light loss, while still enabling wavelength conversion when other colors are required.
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 configuration reduces blue light loss, simplifies the optical structure, and decreases the complexity of electronic control, leading to a more cost-effective and efficient projection system.
Implementation Method 1
The excitation beam is reflected by the beam splitting filter region when the beam splitting filter region cuts into the transmission path of the excitation beam
Implementation Method 2
The wavelength conversion element is configured to convert the excitation beam coming from the beam splitting filter region to a conversion beam
Data Source
AI summary
An illumination system, including an excitation light source, a beam splitting filter device, and a wavelength conversion element, is provided. The excitation light source is configured to emit an excitation beam. The beam splitting filter device includes a light penetration region and a beam splitting filter region. The excitation beam penetrates the light penetration region to form a first beam. The excitation beam is reflected by the beam splitting filter region. The wavelength conversion element is disposed on a transmission path of the excitation beam coming from the beam splitting filter region. The wavelength conversion element is configured to convert the excitation beam coming from the beam splitting filter region to a conversion beam and transmit the conversion beam back to the beam splitting filter region, and the conversion beam at least partially penetrates the beam splitting filter region to form a second beam. A projection device is also provided.