Stop Drive Control Device for Imaging Apparatus Zoom Lens Brightness
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Solution Overview
Problem
Existing stop drive control systems for imaging apparatuses fail to accurately adjust the stop opening degree in response to fluctuations in the focal length of a zoom lens, leading to inconsistencies in image brightness and suboptimal performance.
Innovation Solution
A processor-controlled stop drive control device that adjusts the stop opening degree based on opening degree history information, associating current and target opening degrees, and adjusts driving force according to predefined thresholds and operation speed, ensuring appropriate stop drive control during zoom lens operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the stop opening degree is adjusted based on focal length fluctuations during zoom lens operation, then image brightness consistency is improved, but the device complexity increases due to the need for history information management and threshold-based control logic
Solution Approach 1:
The control device stores target opening degrees and frame numbers in advance during zoom lens operation, creating opening degree history information before it is needed for brightness correction. This allows the system to have correction data ready when focal length fluctuations occur, improving response time and brightness consistency without adding complex real-time calculation logic
Solution Approach 2:
The system uses frame number comparisons and history information to determine whether to apply opening degree corrections. By feedback from stored historical data and threshold comparisons, the control device intelligently decides when correction is needed, maintaining brightness consistency while avoiding unnecessary adjustments that would increase system complexity
2Illumination intensity
If the stop opening degree adjustment mechanism is driven continuously to maintain target opening degree, then image brightness consistency is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous adjustment, the system performs stop opening degree corrections periodically based on frame number comparisons and threshold evaluations. The control device checks whether correction is needed by comparing current frame data with stored history information, applying adjustments only when necessary conditions are met (when difference exceeds threshold), thereby maintaining brightness consistency while reducing energy consumption from continuous driving
Solution Approach 2:
The control device uses its own stored history information and current sensor data to automatically determine when correction is needed, without requiring external continuous commands. The system serves itself by autonomously deciding when to apply opening degree corrections based on pre-stored target values and current operational state, reducing energy usage while maintaining brightness consistency
3Manufacturing precision
If the stop opening degree adjustment mechanism is driven with high precision to match target opening degree, then manufacturing precision requirements increase, but image quality improves
Solution Approach 1:
The system applies different control strategies based on local conditions - using threshold-based selective correction rather than uniform high-precision control for all operations. By correcting the opening degree only when the difference between current and target values exceeds a predetermined threshold, the system achieves sufficient precision for image quality while reducing manufacturing precision requirements for the stop mechanism itself
Solution Approach 2:
The control device changes the operational parameters of the stop mechanism by using threshold-based control instead of continuous precision control. By adjusting the control parameter (applying correction only when |current - target| > threshold), the system achieves acceptable precision for image quality without requiring high-precision manufacturing of the stop opening degree adjustment mechanism
4Measurement precision
If the control system uses extensive history information and threshold comparisons to determine stop drive, then measurement precision of opening degree is improved, but processing time increases
Solution Approach 1:
The control device extracts only the necessary information from history data - specifically comparing current frame number with stored frame numbers and evaluating whether the opening degree difference exceeds the threshold. By taking out only the critical comparison operations rather than processing all historical data, the system maintains measurement precision while minimizing processing time and avoiding unnecessary computational overhead
Data Source
AI summary
A CPU of a controller of an imaging apparatus includes a stop driving controller. The stop driving controller performs drive control of a stop opening degree adjustment mechanism based on opening degree history information in which a current opening degree is associated with a target opening degree in accordance with a fluctuation of a focal length of a zoom lens.