Multi-FOV LiDAR Scanning Without Mechanical Rotation
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Solution Overview
Problem
Conventional LiDAR devices face issues with mechanical rotation causing thermal problems and reduced measurement distance due to laser diffusion, limiting their scan area expansion.
Innovation Solution
A LiDAR device utilizing multiple lasers to form multiple Field of Views (FOVs) with specific angular arrangements to enhance scan area without mechanical rotation, ensuring stable and extended FOVs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the LiDAR device is mechanically rotated to expand the scan area, then the scan area is increased, but thermal problems occur and stability deteriorates
Solution Approach 1:
The patent replaces the mechanical rotation system with an optical scanning system using galvanometer mirrors. The first and second scanning units (galvanometer mirrors) deflect the first and second lasers to scan different FOVs, eliminating mechanical rotation of the entire LiDAR device. This substitution resolves the contradiction by expanding scan area through optical deflection rather than mechanical rotation, thereby avoiding thermal problems and stability issues associated with mechanical rotation.
2Area of stationary object
If the LiDAR device uses a diffusion lens to expand the scan area, then the scan area is increased, but the measurement distance is reduced due to laser diffusion
Solution Approach 1:
The patent divides the scan area coverage into multiple separate FOVs using multiple lasers. The first laser scans a first FOV and the second laser scans a second FOV, with the FOVs positioned adjacent to each other. This segmentation allows each laser to maintain its beam integrity and measurement distance capability while collectively covering a larger scan area, avoiding the laser diffusion problem caused by using a single diffusion lens.
3Area of stationary object
If multiple lasers are used to form multiple FOVs, then the scan area is expanded, but the device complexity increases
Solution Approach 1:
The patent makes the scanning units serve multiple functions: the first scanning unit scans both the first FOV (using first laser) and the second FOV (using second laser), and the second scanning unit similarly scans both FOVs. This multi-functionality allows the system to expand scan area using multiple lasers while reducing overall device complexity by having scanning units perform multiple scanning tasks rather than requiring separate dedicated scanning mechanisms for each laser and FOV.
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 provides a LiDAR device with expanded scan areas and improved stability by minimizing mechanical rotation and maintaining measurement distance, enhancing performance.
Implementation Method 1
a first laser emitting unit configured to emit a first laser, a second laser emitting unit configured to emit a second laser
Implementation Method 2
A LiDAR device configured to obtain distance information of an object using a laser... detect a laser reflected from an object existing on the scan area to obtain distance information
Implementation Method 3
a scanning unit configured to form a first FOV (Field of View) using the first laser and form a second FOV (Field of View) using the second laser
Data Source
AI summary
The present invention is related to a Light Detecting And Ranging (LiDAR) device configured to measure a distance using a laser, the LiDAR device including: a first laser emitting unit configured to output a first laser; a second laser emitting unit configured to output a second laser; a scanning unit configured to form a first field of view (FOV) using the first laser and a second FOV using the second laser; and a detecting unit configured to measure a distance to an object using the first and second lasers.