Scanner Reflector LiDAR Layout for Higher Light Reception
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Solution Overview
Problem
Conventional lidar sensors have a high number of parts and reduced light reception efficiency due to the presence of a reflection mirror and a cover area that obstructs the reception area, which hinders their ability to perform tasks like autonomous driving and parking effectively.
Innovation Solution
A lidar sensing device design that integrates the sensing light source unit with the scanner unit, eliminating the need for a separate reflection mirror and reducing the optical path length, thereby improving light reception efficiency and reducing the number of parts by using a single optical module with a light-transmitting lens unit and a scanner reflector to collimate and reflect light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a reflection mirror is added to bend the optical path, then the size of the lidar sensor is reduced, but the number of parts increases
Solution Approach 1:
The patent combines the transmission reflector and reception reflector into a single integrated reflector structure. The transmission reflector reflects sensing light toward the target, while the reception reflector reflects incident light from the target back to the light-receiving lens. This merging eliminates the need for a separate reflection mirror and reduces the overall number of parts while maintaining the compact optical path design.
2Volume of moving object
If the transmission scope tube and transmission reflector are positioned to reduce sensor size, then the lidar sensor becomes more compact, but a cover area is created that blocks the reception area
Solution Approach 1:
The patent applies local quality by making the reflector light-transmitting in specific regions and light-reflecting in other regions. The transmission reflector portion is light-transmitting to allow sensing light to pass through to the target, while the reception reflector portion is light-reflecting to bounce incident light back to the detector. This spatial differentiation of optical properties eliminates the cover area problem while maintaining compact dimensions.
Solution Approach 2:
The reflector is segmented into functionally distinct regions: a transmission reflector region for reflecting sensing light outward, and a reception reflector region for reflecting incident light inward. This segmentation allows each region to perform its specific function without interfering with the other, eliminating the need for separate transmission and reception optical paths that would create cover areas.
3Length of stationary object
If a separate reflection mirror is used to bend the optical path, then the optical path length is reduced, but the device complexity increases
Solution Approach 1:
The patent merges the transmission reflector and reception reflector into a single integrated component that performs both functions. This eliminates the need for a separate reflection mirror to bend the optical path, thereby reducing the optical path length while simultaneously reducing the number of parts and device complexity.
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 design enhances light reception efficiency, increases the maximum detection distance, and reduces the size and part count of the lidar sensor, making it more suitable for advanced vehicle navigation functions.
Implementation Method 1
a light-transmitting lens unit positioned on the output side of the light source to collimate the sensing light radiated by the light source so that the sensing light passes through the light-transmitting reflector
Implementation Method 2
a light-transmitting reflector configured to reflect the sensing light radiated by the sensing light source unit toward the target
Implementation Method 3
a scanner reflector configured to reflect the incident light reflected by the target toward the light-receiving lens
Implementation Method 4
a light-receiving lens configured to transmit the incident light reflected by the scanner unit
Implementation Method 5
a light-receiving reflector configured to reflect the incident light passing through the light-receiving lens
Data Source
AI summary
A light detection and ranging (“lidar”) sensing device including a sensing light source unit configured to radiate sensing light, a scanner unit configured to reflect the sensing light radiated by the sensing light source unit toward a target and to reflect incident light reflected by the target and integrated with the sensing light source unit, a light-receiving lens configured to transmit the incident light reflected by the scanner unit, a light-receiving reflector configured to reflect the incident light passing through the light-receiving lens, and an optical detection unit on which the incident light reflected by the light-receiving reflector is incident.