Polyhedral Mirror LiDAR Scanning for Wider FOV and Resolution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LiDAR devices face challenges in providing sufficient scanning resolution and field of view, particularly in both horizontal and vertical directions, which are crucial for applications like autonomous driving and 3D audio-video systems.
Innovation Solution
A LiDAR device with a polyhedral rotating mirror having multiple reflecting surfaces with different inclination angles, combined with a scanning unit and light emitting/receiving modules, enhances scanning resolution and field of view by utilizing a greater number of scanning lines with fewer laser sources, and optimizing light reception area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing LiDAR devices use conventional scanning mechanisms, then the device structure remains simple, but the scanning resolution and field of view are insufficient
Solution Approach 1:
The patent divides the scanning function into multiple independent polyhedral rotating mirrors, each with different inclination angles. This segmentation allows each mirror to handle specific scanning directions and resolutions, achieving high scanning resolution without requiring a single complex scanning mechanism. The light emitting module is also segmented into multiple units with different fields of view, enabling distributed scanning coverage.
Solution Approach 2:
The patent introduces a new dimension by using polyhedral rotating mirrors with different inclination angles to scan in multiple spatial dimensions simultaneously. The mirrors are arranged to scan in both horizontal and vertical directions with different angular resolutions, effectively adding dimensional complexity to the scanning system without proportionally increasing overall device complexity.
2Area of stationary object
If existing LiDAR devices use limited light receiving units, then the device complexity is low, but the light receiving field of view is insufficient
Solution Approach 1:
The patent merges multiple light receiving units with different fields of view into a single light receiving module. The first light receiving unit corresponds to a first field of view while the second light receiving unit corresponds to a second field of view, and both are integrated to receive reflected light from the polyhedral rotating mirrors. This merging approach expands the overall light receiving field of view without creating completely separate receiving systems.
Solution Approach 2:
The light receiving module is designed with multi-functionality to handle different scanning scenarios. The same light receiving module can receive light scanned by different polyhedral rotating mirrors with different inclination angles, making it adaptable to various scanning configurations and maximizing the utilization of the receiving area.
3Productivity
If existing LiDAR devices use fewer scanning lines, then the device complexity is reduced, but the scanning coverage and detection accuracy are limited
Solution Approach 1:
The patent employs asymmetric arrangement of polyhedral rotating mirrors with different inclination angles to maximize scanning coverage. Rather than using symmetric configurations, the mirrors are positioned and angled differently to cover specific angular ranges, allowing the system to achieve comprehensive scanning coverage with fewer scanning lines by strategically placing each mirror to cover its optimal sector.
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 improves the ranging capability and signal intensity of the LiDAR device, enabling more efficient and accurate detection of target features by maximizing the receiving area of the polyhedral rotating mirror.
Implementation Method 1
a first light signal emitted by a light emitting unit is reflected towards a to-be-detected target scene by a first reflecting mirror surface among a plurality of reflecting mirror surfaces of the polyhedral rotating mirror
Implementation Method 2
the at least one light receiving unit being configured to convert the received second light signal into a detection signal
Data Source
AI summary
The present disclosure relates to the technical field of detection, and in particular to a LiDAR device, a scanning unit and a vehicle. The LiDAR device includes a light emitting module, a scanning unit, a light receiving module, and a processing unit, wherein the scanning unit at least includes a polyhedral rotating mirror that rotates around a rotation axis, a first light signal is reflected towards a to-be-detected target scene by a first reflecting mirror surface, a second light signal reflected by a target object in the to-be-detected target scene is reflected by a second reflecting mirror surface to finally reach a light receiving unit, the first reflecting mirror surface has a first inclination angle, the second reflecting mirror surface has a second inclination angle, and the first inclination angle is different from the second inclination angle.