Stop Device for Aerial Vehicle Camera Rotation Control
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Solution Overview
Problem
Aerial photography systems face limitations in achieving a full 360° rotation due to stopping actions, which can lead to insufficient shooting angles, and unlimited rotations can cause damage to flexible printed circuit board (FPC) wiring, reducing its service life.
Innovation Solution
A stop device with a motor rotor assembly and stator assembly, including shift levers and a stopping boss, allows for rotation angles greater than 360° and less than 720°, preventing excessive rotation and reducing friction through a sleeve member, thereby protecting the FPC wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-revolution limited rotation structure is used, then the structure is simple and reliable, but the shooting angle is insufficient due to rotation being limited to one revolution
Solution Approach 1:
The patent applies dynamics by transitioning from a static single-revolution limit to a dynamic multi-revolution system with controlled stopping. The rotation structure allows dynamic movement through multiple revolutions (greater than 360° and less than 720°) while incorporating a stop device that dynamically controls the final position, enabling both extended shooting angles and structural reliability.
2Adaptability or versatility
If an indefinite full-revolution rotation structure is used, then the shooting angle is sufficient, but the FPC wiring may break due to unlimited rotations
Solution Approach 1:
The patent implements feedback control through the stop device that monitors rotation position and provides stopping force at the appropriate moment. The stop device receives feedback from the rotation system and activates to prevent excessive rotation, thereby protecting the FPC wiring while allowing sufficient shooting angles through controlled multi-revolution rotation.
Solution Approach 2:
The stop device applies preliminary anti-action by preparing to stop the rotation before the FPC wiring would be damaged. The stopping boss and shift lever mechanism are positioned to engage and prevent excessive rotation in advance, counteracting the potential harmful effect of unlimited rotations on FPC integrity.
3Reliability
If a stop device is added to control rotation, then FPC wiring is protected, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the stop device into distinct functional components: the stopping boss on the rotating shaft, the shift lever with shifting part, and the motor stator assembly with receiving groove. This segmentation allows each component to perform its specific function independently, simplifying the overall design and maintenance while providing reliable rotation control to protect FPC wiring.
Data Source
AI summary
A stop device includes a first shift lever including a first shifting part configured to rotate around a rotation axis to form a first motion trajectory, and a second shift lever including a second shifting part partially within the first motion trajectory. The first shifting part drives the second shifting part to rotate around the axis of the rotating shaft to form a second motion trajectory. The stop device further includes a stopping boss located on a periphery of the first motion trajectory and partially within the second motion trajectory. The second shift lever rotates to drive the second shifting part to contact a first side of the stopping boss when rotating in a first direction and to contact a second side of the stopping boss facing away from the first boss when rotating in a second direction opposite to the first direction.