Laser Beam Reshaping for Uniform Projection Illumination
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Solution Overview
Problem
Current projection systems using Multi-Chip LD laser devices face challenges in achieving uniform illumination due to Gaussian distribution of laser light, leading to energy loss and increased system size, as conventional methods like diffusion sheets and light pipes fail to adequately homogenize light intensity.
Innovation Solution
A laser device with a housing, laser chip assemblies, and a reshaping component that includes collimating and diffractive elements to convert Gaussian-distributed laser beams into flat-topped beams with uniform intensity, eliminating the need for additional components like light pipes, thereby simplifying the system design and reducing energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional methods like diffusion sheets and light pipes are used to homogenize light intensity, then uniform illumination can be achieved, but system size increases and energy loss occurs
Solution Approach 1:
The patent combines the collimating function and beam shaping function into a single integrated optical system. The beam shaping component performs both collimation of laser beams and transformation of Gaussian intensity distribution to flat-top distribution, eliminating the need for separate diffusion sheets and light pipes, thus reducing system size while achieving uniform illumination
Solution Approach 2:
The patent changes the intensity distribution parameter of the laser beam from Gaussian distribution to flat-top distribution through the beam shaping component. This parameter transformation achieves uniform illumination across the projection screen without requiring additional homogenizing components, thereby reducing system volume
2Illumination intensity
If conventional methods like diffusion sheets and light pipes are used to homogenize light intensity, then uniform illumination can be achieved, but energy loss increases
Solution Approach 1:
The patent merges collimation and beam shaping functions into one component that operates directly in the laser beam path. This integrated approach avoids the multiple interfaces and scattering events in conventional diffusion-based methods, reducing energy loss while achieving uniform illumination
Solution Approach 2:
The patent replaces mechanical diffusion-based homogenization systems with an optical beam shaping system that uses controlled refraction and diffraction. This substitution reduces energy loss by avoiding the scattering and absorption inherent in diffusion sheets and light pipes
3Illumination intensity
If additional components like light pipes are added to achieve uniform illumination, then illumination uniformity improves, but device complexity increases
Solution Approach 1:
The patent combines multiple optical functions (collimation and beam shaping) into a single integrated component. This merger simplifies the device structure by eliminating the need for separate diffusion sheets, light pipes, and other homogenizing components, reducing device complexity while maintaining illumination uniformity
Solution Approach 2:
The beam shaping component performs multiple functions simultaneously: it collimates the divergent laser beams and transforms the Gaussian intensity distribution to flat-top distribution. This multi-functionality reduces the number of components needed, thereby simplifying the overall device structure
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 uniform illumination without additional components, reducing energy loss and system size, enhancing the miniaturization and efficiency of the projection system.
Implementation Method 1
each collimating lens (250) is configured to receive a laser beam from the corresponding laser chip (201) and collimate the laser beam
Implementation Method 2
the reshaping component (300) includes a diffractive optical element (310) configured to receive the plurality of collimated laser beams and transform the Gaussian-distributed laser beams into flat-topped beams having a uniform intensity
Data Source
AI summary
A laser device, comprising a housing, a plurality of laser chip assemblies and a reshaping component. The housing comprises: a bottom plate; and a sidewall connected to the bottom plate. The plurality of laser chip assemblies is arranged on the bottom plate. The reshaping component is connected to the sidewall. The reshaping component defines a first enclosed space together with the housing. The plurality of laser chip assemblies is disposed within the first enclosed space, and the reshaping component is disposed in a light-output path of at least a portion of the laser chip assemblies.