Focus Control Device for Smooth Lens Coordination
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Solution Overview
Problem
Existing lens control methods for imaging apparatuses with multiple focus lens units struggle to smoothly coordinate the movement of focus lens units during focusing, leading to abrupt movements and suboptimal optical performance, especially when adjusting the shortest image capturing distance.
Innovation Solution
A control device and method that generates a target position profile for the second focus lens unit based on relationship information between the first and second focus lens units and object distance, calculates shifts, corrects target positions, and controls the second focus lens unit to maintain optimal positional relationships, thereby preventing abrupt movements and ensuring smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the target position of the second focus lens unit is calculated solely based on position characteristic data during zooming, then the lens unit movement is controlled, but abrupt movements occur and smooth coordination between focus lens units is not achieved
Solution Approach 1:
The control device calculates the shift between the ideal position (from position characteristic data) and the actual target position of the second focus lens unit, then uses this shift information to correct the target position. This feedback mechanism ensures smooth coordination between focus lens units while maintaining optical performance stability.
Solution Approach 2:
The invention introduces a correction value that modifies the target position parameter of the second focus lens unit based on the calculated shift. By changing the position parameter dynamically using the correction value, the system achieves smooth movement coordination while preventing abrupt movements that would degrade optical performance.
2Adaptability or versatility
If multiple focus lens units move independently during focusing, then each unit can be controlled separately, but abrupt movements occur and designed positional relationships are not maintained
Solution Approach 1:
The system maintains independent control capability of each focus lens unit while introducing feedback through shift calculation. The control device continuously monitors the positional relationship between the first and second focus lens units and adjusts the second unit's target position based on the calculated shift, ensuring both independence and precision are maintained.
Solution Approach 2:
The invention introduces a correction value as an intermediary element that mediates between the independent control of each focus lens unit and the maintenance of their positional relationship. This intermediary allows each unit to be controlled independently while ensuring their relative positions remain precise according to the designed relationship.
3Device complexity
If the second focus lens unit position is not corrected during zooming, then the control system is simple, but abrupt movements occur and optical performance deteriorates
Solution Approach 1:
The control device implements a feedback mechanism that calculates the shift between the ideal position and actual target position of the second focus lens unit. This feedback approach maintains relatively simple system architecture while preventing abrupt movements and maintaining optical performance through continuous position correction.
Solution Approach 2:
The system performs preliminary calculation of the shift and determination of correction values before executing the position adjustment of the second focus lens unit. This preliminary action prevents abrupt movements by pre-computing the necessary corrections, thereby maintaining optical performance without requiring complex real-time control mechanisms.
Data Source
AI summary
A lens control unit as a control device includes a second position profile generator that generates a second target position profile indicating a target position of a second focus lens unit of a lens apparatus in driving the second focus lens unit. A trajectory shift amount calculator of the lens control unit calculates a shift between an ideal position of the second focus lens unit corresponding to a position of the first focus lens unit and a position of the second focus lens unit in the second target position profile. A correction value calculator corrects the target position of the second focus lens unit based on this shift.