Lidar Scanner Orthogonal Board Layout Reduces Noise
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Solution Overview
Problem
Conventional lidar devices face issues with electrical noise and increased size due to the close proximity and parallel arrangement of light emission and reception boards, which overlap and interfere with each other.
Innovation Solution
The lidar device configuration includes a phototransmitter and photoreceiver with light sources and detectors arranged such that their transmission and reception directions are orthogonal, using a scanner with rotating deflection mirrors to separate these components and minimize overlap, thereby reducing electrical noise and device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the light emission board and light reception board are arranged in parallel with overlapping surfaces to reduce device size, then the device size is reduced, but electrical noise increases due to close proximity and interference
Solution Approach 1:
The patent transitions from a two-dimensional parallel arrangement to a three-dimensional orthogonal arrangement. The light emission board and light reception board are positioned perpendicular to each other, with the scanner rotating between them. This spatial reconfiguration in a different dimension allows both boards to be close to the scanner while maintaining sufficient separation to reduce electrical noise interference, thus resolving the contradiction between compact size and noise reduction.
2Area of stationary object
If the light emission board and light reception board are arranged in parallel with overlapping surfaces, then space utilization is improved, but the structural complexity and interference between components increase
Solution Approach 1:
The patent divides the lidar device into functionally independent segments: the light emission board, the scanner, and the light reception board. Each component is positioned independently in space, with the scanner acting as a separate rotating element between the emission and reception boards. This segmentation allows for optimized spatial arrangement where each component can be positioned for its specific function without compromising others, reducing structural complexity while maintaining efficient space utilization.
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 reduces electrical noise and allows for a more compact design by ensuring the light emission and reception boards are arranged with non-overlapping, perpendicular mount surfaces, effectively utilizing space and simplifying the device's structure.
Implementation Method 1
at least one light source configured to transmit a light beam in a first direction
Implementation Method 2
a received-light deflection mirror configured to deflect an arrival light beam outputted from the scanner in a second direction different from the first direction
Data Source
AI summary
A scanner has a rotational shaft and at least one reflection surface. The scanner rotates the at least one reflection surface together with the rotational shaft to thereby (i) change a direction of the light beam transmitted from the phototransmitter and incident on the scanner to output a changed light beam in a main scanning direction that is orthogonal to an axial direction of the rotational shaft, and (ii) reflect an arrival light beam arriving from a scanning region to thereby output the light beam to a direction in which the light beam is incident on the scanner. A photoreceiver receives the arrival light beam reflected by the scanner. The photoreceiver includes a received-light deflection mirror that deflects the arrival light beam outputted from the scanner in a second direction different from the first direction, and a light receiving device that receives the arrival light beam deflected by the received-light deflection mirror.