Lens Barrel Collision Avoidance During Reset Drive
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Solution Overview
Problem
In optical systems with overlapping movement regions for multiple moving lens frames, collisions occur during reset and normal driving, necessitating efficient collision avoidance mechanisms.
Innovation Solution
A lens barrel design with a first and second moving lens frame, a drive unit for moving these frames along the optical axis, a detection unit to detect reference positions, and a control unit that adjusts reset drive conditions based on detection outputs to prevent collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reset drives are performed for multiple moving lens frames in overlapping optical systems, then positioning accuracy is improved, but collision risk between moving lens frames increases
Solution Approach 1:
The system performs preliminary detection of current positions of multiple moving lens frames before executing reset drives. Based on this advance information, the control unit determines a safe execution order and adjusts drive conditions to prevent collisions while achieving accurate positioning.
Solution Approach 2:
The control unit continuously monitors the positions of moving lens frames during reset operations and dynamically adjusts drive conditions based on real-time feedback. This closed-loop control enables the system to prevent collisions while maintaining positioning accuracy by responding to actual system state changes.
2Productivity
If reset drive time is reduced for faster operation, then productivity is improved, but positioning precision deteriorates
Solution Approach 1:
The system dynamically adjusts reset drive conditions including speed and acceleration profiles based on real-time position detection and system state. This enables rapid reset operations when conditions permit while maintaining precision when needed, optimizing the balance between speed and accuracy.
Solution Approach 2:
The control unit changes drive parameters such as movement speed, acceleration, and timing based on detected positions and system conditions. By adaptively modifying these parameters, the system achieves fast reset operations without sacrificing positioning precision through intelligent parameter optimization.
3Measurement precision
If multiple detection elements are used to detect reference positions accurately, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The control unit serves multiple functions: it detects reference positions, determines execution orders, adjusts drive conditions, and prevents collisions. By making the control unit multi-functional, the system achieves high measurement precision without proportionally increasing overall system complexity.
Solution Approach 2:
The system combines multiple detection functions and control operations into a unified control framework. By merging the detection of multiple reference positions and the coordination of multiple moving lens frames into a single integrated control system, the patent reduces complexity compared to having separate dedicated systems for each function.
Data Source
AI summary
A lens barrel 100 can quickly avoid collisions between moving lens frames having overlapping regions within their movement ranges at the time of a reset drive using a simple configuration, and has moving lens frames 101, and 102 that have overlapping regions OL in their movement ranges M1, and M2; drive units 103, and 104 that move the moving lens frames 101, and 102 in an optical axis direction O; a detection unit 130 configured to detect reference positions P1, and P3 of the moving lens frames 101, and 102; and a control unit J configured to perform a reset drive that moves the moving lens frames 101, and 102 to reference positions P1, and P3, wherein the control unit C changes reset drive conditions for the moving lens frames 101, and 102 based on outputs from the detection unit 130.