Laser Illumination System Using Segmented Beam Diffusion
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Solution Overview
Problem
Laser projectors face challenges with increased brightness requirements, leading to bulky sizes and potential damage to internal optical devices due to concentrated energy, which shortens their service life.
Innovation Solution
The use of multiple laser source modules that emit beams to form light spots at different locations on a diffusion component, reducing the need for large lenses and dispersing energy density to prevent damage, resulting in a smaller and more durable optical system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of laser sources is increased to meet higher brightness requirements, then the output brightness is improved, but the optical path becomes longer and the overall size becomes bulky
Solution Approach 1:
The patent divides the single laser source into multiple laser sources (first laser source and second laser source). Each laser source independently emits laser beams that are directed through separate optical paths to the diffusion component. This segmentation allows the system to achieve higher total brightness without requiring a single long optical path, thereby reducing the overall device volume.
2Illumination intensity
If the laser power is increased to meet brightness requirements, then the output brightness is improved, but the energy intensity becomes too concentrated which may burn the internal optical device or shorten its service life
Solution Approach 1:
The patent segments the high-power laser source into multiple lower-power laser sources. Each laser source emits beams with lower energy intensity that are distributed to different locations on the diffusion component. This prevents any single point from receiving excessive energy that could cause burning or degradation, thereby extending the service life of the optical devices while maintaining the required total brightness output.
3Illumination intensity
If a larger lens is used to direct all laser beams to the internal optical device, then the brightness is improved, but the device complexity and size increase
Solution Approach 1:
The patent employs multiple smaller lenses (first lens and second lens) instead of a single large lens. Each lens corresponds to a specific laser source and directs its beam through a dedicated optical path. This segmentation simplifies the individual optical paths and reduces the complexity of each lens, while the combined effect of multiple paths achieves the required brightness without needing a single large complex lens system.
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 approach allows for a compact projector design with extended service life by distributing laser beams and reducing energy concentration on the diffusion component, enabling adjustable brightness and improved homogeneity of the illumination beam.
Implementation Method 1
a diffusion component, wherein the plurality of first laser beams form a plurality of light spots at a plurality of locations on the diffusion component
Data Source
AI summary
A projection apparatus including a projection lens, a light valve module, and an illumination system optically coupled to produce an image beam is provided. The illumination system further includes a plurality of first laser source modules adapted to emit a plurality of first laser beams, and a diffusion component disposed on transmission paths of the plurality of first laser beams, such that the plurality of first laser beams form a plurality of light spots at a plurality of locations on the diffusion component.