Inclined Light Diffusion Element for Wavelength Conversion Module
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Solution Overview
Problem
The wavelength conversion module in projection apparatuses is prone to burning due to excessive concentration of beam energy, leading to reduced light conversion efficiency.
Innovation Solution
Incorporating a light-diffusion element inclined at an angle relative to the light beam transmission path, which expands the light spot on the wavelength conversion module, thereby reducing energy density and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the light beam is directly illuminated on the wavelength conversion module, then the light conversion efficiency is improved, but the wavelength conversion module is burned due to excessive concentration of beam energy
Solution Approach 1:
A light-diffusion element is introduced as an intermediary component between the light beam and the wavelength conversion module. This element diffuses the concentrated light beam into a broader area, reducing the energy density on any single point of the wavelength conversion module while still providing sufficient illumination for efficient wavelength conversion.
Solution Approach 2:
The light-diffusion element spreads the light beam in the spatial dimension, transforming a concentrated narrow beam into a broader, more distributed illumination pattern. This dimensional expansion reduces the energy concentration on the wavelength conversion module surface, preventing burning while maintaining overall conversion efficiency.
2Productivity
If the light beam energy is concentrated on the wavelength conversion module, then the light conversion efficiency is improved, but the energy density causes overheating and burning
Solution Approach 1:
The light-diffusion element serves as a thermal management intermediary by redistributing the optical energy before it reaches the wavelength conversion module. This prevents localized overheating while maintaining sufficient total energy for conversion, effectively decoupling conversion efficiency from temperature rise.
Solution Approach 2:
The light-diffusion element changes the spatial distribution parameter of the light beam, transforming a high-energy-density concentrated beam into a lower-energy-density distributed beam. This parameter change reduces the temperature rise in the wavelength conversion module while preserving the total optical power available for conversion.
3Object-affected harmful factors
If a light-diffusion element is added to the system, then the energy density is reduced and module burning is prevented, but the device complexity increases
Solution Approach 1:
The light-diffusion element is implemented as a simple, inexpensive optical component that can be easily integrated into the existing system. Rather than complex active cooling or energy management systems, a passive diffusion element provides the necessary protection, simplifying the overall system architecture.
Solution Approach 2:
The light-diffusion element is positioned as a simple intermediary in the optical path, requiring minimal alignment or adjustment. This straightforward integration adds minimal complexity while effectively addressing the module burning issue through passive optical diffusion.
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 design effectively prevents the wavelength conversion module from burning and maintains light conversion efficiency by distributing the energy density, ensuring good performance of the projection apparatus.
Implementation Method 1
at least one light-diffusion element disposed on a transmission path of the light beam from the light source
Implementation Method 2
The wavelength conversion module is adapted to convert a first portion of the light beam from the light-diffusion element to a converted light beam
Data Source
Figure 1
Figure 2~3B
Figure 4
AI summary
A projection apparatus and an illumination system are provided. The illumination system includes a light source emitting a light beam, at least one light-diffusion element disposed on a transmission path of the light beam from the light source and inclined to the transmission path of the light beam from the light source, a wavelength conversion module disposed on a transmission path of the light beam from the at least one light-diffusion element. A long axis direction of a light spot projected on the wavelength conversion module is perpendicular to an extending direction of a boundary between the reference plane and the at least one light-diffusion element. The wavelength conversion module is adapted to convert a first portion of the light beam from the light-diffusion element to a converted light beam. The converted light beam and a second portion of the light beam from the light-diffusion element form a illumination light.