LiDAR Lens System Filter Positioning for Transmittance
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Solution Overview
Problem
Conventional LiDAR lens systems suffer from reduced efficiency due to a large angle of incident light on the filter part, which decreases transmittance and overall performance.
Innovation Solution
The filter part is strategically positioned within the lens system to minimize the angle of incident light to between 0 and 25 degrees with respect to the optical axis, allowing for optimized placement either in front of or behind the aperture, and incorporating lenses with positive refractive power to enhance transmittance and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the filter part is positioned between the image sensor and the last lens, then the lens system structure is simplified, but the angle of light incident on the filter part becomes large, reducing transmittance and overall efficiency
Solution Approach 1:
The patent repositions the filter part from a conventional location (between image sensor and last lens) to a new position within the lens assembly where light incident angles are minimized. This spatial reconfiguration in the optical path dimension allows the filter to receive near-normal incident light (0-25 degrees), dramatically improving transmittance while maintaining structural integration.
2Loss of energy
If the filter part is positioned to minimize the angle of incident light, then light transmittance and efficiency are improved, but the device complexity increases due to precise positioning requirements
Solution Approach 1:
The patent integrates the filter part directly into the lens assembly structure, merging the filter positioning function with the existing lens mechanical support. This consolidation eliminates the need for separate positioning mechanisms and complex alignment systems, achieving precise filter positioning (0-25 degree incident angle) while simplifying the overall device structure.
3Ease of manufacture
If conventional lens positioning is used, then the lens system is easy to manufacture, but the angle of light incident on the filter part is large, reducing measurement precision
Solution Approach 1:
The patent applies local quality optimization by specifically designing the filter positioning location within the lens system to achieve minimal incident angles. Rather than uniformly positioning all components for ease of manufacture, the filter is strategically located where the optical path naturally provides 0-25 degree incident angles, optimizing local light transmission quality while maintaining overall manufacturability.
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 results in a high-efficiency, high-resolution LiDAR lens system that maximizes transmittance and maintains high performance, enabling effective detection of subjects at various distances and speeds, particularly suitable for Flash LiDAR applications in autonomous driving.
Implementation Method 1
a filter part included in the lens part and configured to transmit the light having a specific wavelength or the light belonging to a specific wavelength band
Implementation Method 2
a lens part comprising the plurality of lenses to converge light provided from the light source
Data Source
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AI summary
A lens system for LiDAR is proposed. The lens system includes: a lens part comprising a plurality of lenses to converge light provided from the light source; and a filter part included in the lens part and configured to transmit the light having a specific wavelength or the light belonging to a specific wavelength band, wherein the filter part is arranged at a specific position of the lens part such that an angle of light incident on the filter part is between 0 and 25 degrees. Accordingly, the lens system for lidar with high efficiency, high resolution, and high performance is provided by arranging the filter part at the position where the angle of light incident inside the lens part composed of the plurality of lenses is minimized.