Projection Optical System Uniform Light Intensity Distribution
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Solution Overview
Problem
Existing object detection systems, such as vehicle-installed laser radars, fail to achieve a desired intensity distribution of light beams for effective object detection and distance measurement, particularly in ensuring uniform light intensity across the irradiation area.
Innovation Solution
The use of a projection optical system comprising a first optical element with a refractive incidence and exit plane, and a second optical element, such as a cylindrical lens, to distribute and adjust the light beam's intensity distribution, ensuring even illumination across the irradiation area by compensating for light quantity shortages at the edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional optical systems are used to project light beams for object detection, then the system structure is simple, but the light intensity distribution is non-uniform with shortages at the edges
Solution Approach 1:
The patent introduces optical elements (diffusers, lenses, or reflectors) as intermediary components between the light source and the projection area. These intermediaries modify the light propagation path and intensity distribution, transforming non-uniform light output into uniform illumination across the entire projection area, including edge regions that previously suffered from light shortages.
Solution Approach 2:
The patent modifies optical parameters such as numerical aperture, focal length, and beam divergence angle by selecting specific optical elements. These parameter changes enable precise control over light distribution characteristics, transforming the light intensity profile from non-uniform to uniform while maintaining system feasibility.
2Manufacturing precision
If optical elements are added to achieve desired intensity distribution, then the light intensity uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent applies optical elements with specific local properties at different positions within the optical path. For example, gradient-index lenses or spatially varying diffusers are used to provide different optical functions in different regions, achieving uniform overall illumination while using relatively simple individual components.
Solution Approach 2:
The patent selects optical elements that perform multiple functions simultaneously. A single lens element may provide both beam shaping and focus control, while a diffuser may simultaneously homogenize intensity and expand beam width. This multi-functionality reduces the total number of components needed.
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 achieves a desired intensity distribution, including uniform intensity, over the irradiation coverage, enhancing the accuracy and effectiveness of object detection systems by maintaining consistent light intensity across the detection area.
Implementation Method 1
a projection optical system comprising a first optical element (L11, L21) having a refractive incidence and exit plane
Data Source
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AI summary
Provided is an optical element (L11, L21) including an incidence plane (S11, S21), and an exit plane (S12, S22) including a plurality of planes that are jointed together. The incidence plane (S11, S21) has a shape based on an angle of divergence of light beam incident upon the incidence plane (S11, S21) and irradiation coverage of light beam exiting from the exit plane (S12, S22).