LiDAR Mount With Through Hole For Stable High-Speed Rotation
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Solution Overview
Problem
Existing movable devices face challenges in achieving stable rotation due to turbulent airflow generated during high-speed rotation, which can hamper the rotation of large-sized movable parts or those operating at high frequencies, especially when the size of the movable part is large or the frequency of rotation is high.
Innovation Solution
The design incorporates a mount with a through hole in the mounting board and stationary parts that are spaced apart, allowing airflow to flow through and reducing the generation of turbulent airflow, ensuring stable and accurate rotation of the movable part by preventing air-pressure differences and maintaining open regions for light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the movable part is made large or rotates at high frequency, then the light deflection performance is improved, but turbulent airflow is generated which hampers stable rotation
Solution Approach 1:
The mount is divided into a pair of stationary parts spaced apart from each other, creating separate regions. This segmentation allows airflow to pass through the spacing between the stationary parts, preventing the buildup of turbulent airflow that would otherwise occur with a solid, continuous mount structure. The segmentation enables high-speed rotation to proceed without the harmful aerodynamic effects that would compromise rotation stability.
2Area of moving object
If the movable part is made large-sized, then the light reflection capability is improved, but air-pressure differences occur causing unstable rotation
Solution Approach 1:
Airflow passages are extracted from the mount structure by creating spacing between the pair of stationary parts. This allows air to be removed from the region between the stationary parts, preventing the formation of air-pressure differences that would otherwise occur during high-speed rotation of large-sized movable parts. The extracted airflow paths eliminate the harmful pressure differentials while maintaining the structural integrity needed to support large movable parts.
3Device complexity
If the stationary parts are placed close together, then the device structure is compact, but light reflection paths are blocked
Solution Approach 1:
The mount structure employs asymmetric design where the stationary parts are positioned with specific spacing and orientations. The first stationary part has a first open region and the second stationary part has a second open region, with the spacing between parts optimized to allow light reflection paths to pass through unobstructed. This asymmetric arrangement maintains compact overall dimensions while ensuring that the light reflection capability is not compromised by the structural configuration.
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 enables stable and accurate rotation of the movable part, reducing the adverse effects of turbulent airflow and ensuring reliable operation even at high speeds and large sizes, thereby enhancing the performance of the movable device in applications like optical scanning systems and LiDAR devices.
Implementation Method 1
a drive beam including an elastic beam and a movable portion including a reflecting surface, which are combined as a single unit on a wafer, the drive beam also including a thin film of a piezoelectric material superposed on the elastic beam, and that drives (rotates) the movable portion using the drive beam
Data Source
AI summary
A movable device includes a light deflector including a movable part rotatable about a predetermined axis; a mount including a pair of stationary parts to which the light deflector is secured; and a substrate attached to an opposite side of a light-deflector side of the mount. The substrate has a through hole between the pair of the stationary parts.