Light Source System Optical Path Selecting Element
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Solution Overview
Problem
Laser phosphor light sources suffer from significant light efficiency loss due to overlapping wavelength bands between fluorescent and laser light spectra, which affects the color purity and luminous intensity of projection and illumination devices.
Innovation Solution
A light source system with an excitation light source, a supplemental light source, and an optical path selecting element that alternately routes the first color laser light to different paths, allowing for separate wavelength conversion and combination of fluorescent lights with the laser light, thereby optimizing light utilization and reducing efficiency loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If fluorescent light and laser light are combined to achieve better color purity, then color purity is improved, but light efficiency is reduced due to overlapping wavelength bands
Solution Approach 1:
The patent divides the light source system into separate excitation light source and supplemental light source, with the optical path selecting element segmenting the optical paths. By alternately switching between transmitting the excitation light source light directly or transmitting it after wavelength conversion, the system avoids the inefficiency of combining overlapping spectra while maintaining color purity through temporal separation of the light paths.
Solution Approach 2:
The optical path selecting element performs periodic switching between two operational modes: one where excitation light passes through the wavelength conversion device to generate fluorescent light, and another where excitation light passes directly to the output. This periodic alternation allows the system to capture the benefits of both laser light (high efficiency) and fluorescent light (color purity) without the continuous overlap that causes efficiency loss.
2Illumination intensity
If a filter is used to filter fluorescent light to improve color purity, then color purity is improved, but light loss increases significantly
Solution Approach 1:
The patent extracts the harmful overlapping wavelength component by using the optical path selecting element to separate the excitation light path from the fluorescent light path. Instead of filtering the combined light (which causes loss), the system takes out the excitation light before it mixes with the fluorescent light, allowing the fluorescent light to pass through to the output with minimal loss while maintaining color purity.
3Use of energy by moving object
If laser phosphor light source is used to achieve high electro-optical conversion efficiency, then conversion efficiency is improved, but light efficiency loss occurs due to spectrum overlap
Solution Approach 1:
The patent introduces dynamic control through the optical path selecting element that can switch between different optical configurations. The system dynamically adjusts the light path based on operational requirements, alternately connecting the wavelength conversion device in or out of the optical path. This dynamic switching allows the system to maintain high conversion efficiency by using the laser light source while minimizing efficiency loss through temporal separation from the fluorescent light path.
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 achieves high laser light utilization, enhancing luminous intensity and ensuring the quality of output light in projection and illumination devices by minimizing light efficiency loss and improving color purity.
Implementation Method 1
a wavelength conversion device configured to generate a second color fluorescent light under excitation of the first color laser light transmitted along the first optical path
Implementation Method 2
an optical path selecting portion configured to reflect the first color laser light in time sequence to a first optical path or a second optical path
Data Source
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AI summary
A light source system (100), comprising an excitation light source (110), a supplementary light source (120), an optical path selecting element (130), a first wavelength conversion apparatus (150a), and a second wavelength conversion apparatus (150b). The excitation light source (110) is used to emit a first color laser light. The supplementary light source (120) is used to emit laser light as supplementary light. The optical path selecting element (130) comprises a transmitting portion (132), an optical path selecting portion (134), and a driving portion (136), the transmitting portion (132) being used to transmit the first color laser light, the optical path selecting portion (134) being used to reflect the first color laser light along a time sequence to a first optical path or a second optical path, and the driving portion (136) being used to drive the transmitting portion (132) and the optical path selecting portion (134) to be alternately located on an optical path of the first color laser light. The first wavelength conversion apparatus (150a) is used to generate a second color fluorescence light under the excitation of the first color laser light transmitted along the first optical path. The second wavelength conversion apparatus (150b) is used to generate a third color fluorescence light under the excitation of the first color laser light transmitted along the second optical path. The second color fluorescence light, the third color fluorescence light, the supplementary light, and the first color laser light transmitted by the optical path selecting element (130) are combined and then emitted. Also provided are a projection device and illumination device comprising the described light source system.