Lens Driving Device Tele-Macro Mode Control
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Solution Overview
Problem
Users of imaging apparatuses with tele-macro shooting functions face inconvenience in manually selecting between normal and tele-macro shooting modes, often resulting in incorrect mode selection due to forgetfulness, which can lead to out-of-focus images when shooting close-up on the telephoto side.
Innovation Solution
A lens driving device with a control unit that automatically determines and switches to the tele-macro shooting mode by limiting and extending the movement range of focus lenses based on predetermined conditions and object distances, using information stored for each object distance to ensure sharp focus on the telephoto side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the user manually selects the shooting mode, then the device complexity is reduced, but the ease of operation deteriorates and reliability worsens due to user forgetfulness
Solution Approach 1:
The imaging apparatus automatically determines whether tele-macro shooting is required and switches modes without user intervention. The control unit monitors object distance and zoom lens position, then autonomously selects the appropriate shooting mode, making the system serve itself rather than requiring manual user input.
Solution Approach 2:
The system continuously monitors the object distance and zoom lens position as feedback parameters. Based on this real-time feedback, the control unit dynamically adjusts the shooting mode selection, creating a closed-loop control system that adapts to changing conditions.
2Reliability
If the user manually selects the shooting mode, then the device complexity is reduced, but the reliability deteriorates due to incorrect mode selection
Solution Approach 1:
The imaging apparatus automatically determines whether tele-macro shooting is required and switches modes without user intervention. The control unit monitors object distance and zoom lens position, then autonomously selects the appropriate shooting mode, making the system serve itself rather than requiring manual user input.
Solution Approach 2:
The system continuously monitors the object distance and zoom lens position as feedback parameters. Based on this real-time feedback, the control unit dynamically adjusts the shooting mode selection, creating a closed-loop control system that adapts to changing conditions.
3Manufacturing precision
If the focus lens movement range is limited during telephoto shooting, then the manufacturing precision is improved, but the adaptability deteriorates
Solution Approach 1:
The focus lens movement range is not fixed but dynamically adjusted based on the shooting mode. In normal shooting mode, the movement range is limited to ensure precision. When tele-macro mode is detected, the control unit extends the movement range to accommodate closer focusing distances, making the system adaptable to different shooting scenarios.
Solution Approach 2:
The system changes the operational parameters of the focus lens based on the detected shooting mode. By modifying the allowed movement range parameter according to whether tele-macro shooting is required, the system achieves both precision in normal mode and adaptability in tele-macro mode.
Data Source
AI summary
A lens driving device includes a control unit configured to control movement of a first lens to perform zooming operation and a second lens to perform focus adjustment based on information of a position of the first lens and a position of the second lens stored for each object distance, and when the first lens is on a telephoto side of a predetermined position, the control unit limits movement of the second lens to a position corresponding to a second object distance closer than the first object distance, and if a predetermined condition is satisfied after the second lens has reached a predetermined region including the position corresponding to the first object distance, the control unit permits the movement of the second lens to the position corresponding to the second object distance.