Projection Optical System Uniform Intensity Distribution
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Solution Overview
Problem
Existing object detection devices, such as laser radars, fail to project a light beam with a desired intensity distribution, particularly a uniform intensity distribution, over a desired range, which is essential for effective object detection and distance measurement.
Innovation Solution
A projection optical system comprising a light source and optical elements with specific inclination planes and refractive powers that adjust the light beam's divergence angles in different directions, ensuring a uniform intensity distribution over the effective irradiation range by shaping the incidence and emission planes to cover light volume deficiencies and adjust emission intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light sources and simple optical systems are used, then the device structure is simple, but the light intensity distribution is non-uniform and cannot achieve desired emission patterns
Solution Approach 1:
The emission plane is divided into multiple flat planes with different inclination angles. Each flat plane segment directs light at specific angles to achieve uniform intensity distribution across the projection region, transforming a single complex surface into multiple manageable segments.
Solution Approach 2:
Different regions of the emission plane are given different local properties through varying inclination angles of flat planes. Each local region is optimized to emit light with specific intensity characteristics, allowing the entire system to achieve uniform overall distribution while addressing local intensity variations.
2Device complexity
If multiple light sources are arranged in scanning direction without deflector, then the device complexity is reduced, but the intensity distribution control capability is insufficient
Solution Approach 1:
The inclination angles of the flat planes are carefully selected to change the emission parameters of light in different directions. By adjusting these geometric parameters, the system achieves desired intensity distribution patterns without requiring complex active control mechanisms or multiple light sources.
3Ease of operation
If light is emitted with fixed divergent angles, then the light source design is simple, but the effective irradiation range and detection accuracy are limited
Solution Approach 1:
The solution moves from controlling light in one dimension (single divergent angle) to two dimensions by introducing inclination planes that affect both horizontal and vertical light directions. This dimensional expansion allows simultaneous control of light spread in multiple directions, enhancing detection range and accuracy while maintaining simple light source design.
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 a uniform intensity distribution in the effective irradiation range, enhancing emission intensity at both the center and edge portions, thereby improving object detection accuracy and range measurement.
Implementation Method 1
an optical element including an incidence plane on which the light from the light source is incident and an emission plane having a plurality of flat planes to emit the light
Data Source
AI summary
A projection optical system includes a light source to emit light and an optical element including an incidence plane on which the light from the light source is incident and an emission plane having a plurality of flat planes to emit the light, wherein the plurality of flat planes includes a first inclination plane inclining in a direction of the light-emitting surface.