Lidar Light Shielding Plate Rotating Mirror Design
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Solution Overview
Problem
In lidar apparatuses, light leakage between the light projector and the light receiver due to the rotation of the deflecting mirror leads to false detection of obstacles, reducing detection performance.
Innovation Solution
The lidar apparatus incorporates a light shielding plate that rotates with the deflecting mirror and an overlapping partition plate, which attenuates light leakage by reflecting and reducing the intensity of light passing through the overlap portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a deflecting mirror is rotated to perform scanning, then the scanning function is achieved, but light leakage between the light projector and light receiver occurs causing false detection
Solution Approach 1:
The deflecting mirror is segmented into a light-projecting deflector and a light-receiving deflector, with a light shielding plate positioned between them to separate the light paths and prevent leakage while maintaining scanning functionality
Solution Approach 2:
A light shielding plate is introduced as an intermediary element between the light-projecting deflector and light-receiving deflector to block and attenuate light leakage, preventing false detection while allowing both deflectors to perform their respective functions
2Reliability
If a light shielding plate is added to block light leakage, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The light shielding plate is merged with the rotating assembly of the deflecting mirror, so that both components rotate together as a single unit, reducing the number of separate drive mechanisms and simplifying the overall structure
Solution Approach 2:
The light shielding plate serves multiple functions: it blocks light leakage from the light-projecting deflector to the light-receiving deflector, maintains the rotational alignment with the deflecting mirror, and integrates into the existing scanning mechanism without requiring separate actuation
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 effectively reduces light leakage, minimizing false obstacle detection and maintaining detection performance by ensuring that light is adequately attenuated before reaching the light receiver.
Implementation Method 1
a light shielding plate configured by a material that blocks transmission of light, the light shielding plate provided between a light-projecting deflector, which is a portion of the deflecting mirror used for light projection, and a light-receiving deflector, which is a portion of the deflecting mirror used for light reception
Implementation Method 2
a partition plate configured by a material that blocks transmission of light, the partition plate configured to partition an internal space of the enclosure into a light-projecting space where the light projector is disposed and a light-receiving space where the light receiver is disposed
Implementation Method 3
a deflecting mirror configured to reflect light entering from the light projector, the scanner configured to rotate the deflecting mirror with respect to a predetermined rotation axis, thereby changing an output direction, which is a direction for the light entering from the light projector to be reflected by the deflecting mirror and outputted
Data Source
AI summary
A partition plate includes a material that blocks transmission of light and partitions an internal space of an enclosure into a light-projecting space where a light projector is disposed and a light-receiving space where a light receiver is disposed. A light shielding plate is configured by a material that blocks transmission of light, is provided between a light-projecting deflector, which is a portion of a deflecting mirror used for light projection, and a light-receiving deflector, which is a portion of the deflecting mirror used for light reception, and integrally rotates with the deflecting mirror. Further, the partition plate has, with respect to at least a part of a peripheral portion of the light shielding plate, an overlap portion where a plate surface of the partition plate and a plate surface of the light shielding plate overlap without being in contact with each other.