Aperture Stop Drive Mode Switching for High-Speed Continuous Shooting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image pickup apparatuses face challenges in achieving high-speed continuous shooting due to variability in aperture stop accuracy caused by reverse backlash, which limits the continuous shooting speed and requires the aperture stop to be opened and closed repeatedly, affecting exposure control.
Innovation Solution
The implementation of a lens apparatus with an aperture stop unit, drive circuit, and controller that allows for two drive modes: one that opens and closes the aperture stop, and another that adjusts the aperture stop without opening it, enabling high-speed continuous shooting while maintaining accuracy by using a correction table to account for backlash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the aperture stop is driven from a first position to a second position by opening it to an open position first, then the aperture stop accuracy is maintained, but the continuous shooting speed is reduced due to the additional driving time
Solution Approach 1:
The patent applies dynamics by making the aperture stop drive mode adjustable between two operational states: a first drive mode that opens the aperture stop to an open position before moving to the second position (for high precision), and a second drive mode that moves directly from the first position to the second position (for high speed). The system dynamically switches between these modes based on shooting conditions, resolving the contradiction between precision and speed.
Solution Approach 2:
The patent changes the drive mode parameter of the aperture stop based on shooting conditions. When continuous shooting is detected, the system switches to the second drive mode that eliminates the opening step, thereby changing the operational parameter from precision-oriented to speed-oriented, thus resolving the contradiction between aperture stop accuracy and continuous shooting speed.
2Measurement precision
If the aperture stop is opened and closed repeatedly to maintain stable accuracy, then the aperture stop accuracy is improved, but the exposure control capability is lost
Solution Approach 1:
The patent makes the aperture stop drive behavior dynamic by implementing two distinct drive modes. The first drive mode maintains traditional opening-and-closing operation for stable accuracy, while the second drive mode enables direct position adjustment without opening, preserving exposure control capability. The system dynamically selects between these modes based on whether continuous shooting is detected, thus resolving the contradiction between accuracy and adaptability.
Solution Approach 2:
The patent changes the operational parameter of the aperture stop drive mode based on shooting conditions. When continuous shooting mode is detected, the system switches to the second drive mode that maintains exposure control while improving speed, thereby changing the parameter from accuracy-optimized to speed-optimized operation without sacrificing adaptability.
3Reliability
If the aperture stop is driven to an open position before moving to the second position, then reverse backlash is eliminated, but the driving time increases
Solution Approach 1:
The patent applies dynamics by implementing a switchable drive mode system. In the first drive mode, the aperture stop is opened before moving to eliminate reverse backlash (for reliability). In the second drive mode, the aperture stop moves directly without opening (for speed). The system dynamically selects the appropriate mode based on whether continuous shooting is detected, thus resolving the contradiction between reliability and time loss.
Solution Approach 2:
The patent changes the drive mode parameter based on shooting conditions. When continuous shooting is detected, the system switches to the second drive mode that eliminates the opening step, thereby changing the operational parameter from reliability-optimized (with opening) to time-optimized (without opening), resolving the contradiction between aperture stop stability and driving time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables high-speed continuous shooting while ensuring the accuracy of the aperture stop, preventing the need for repeated opening and closing, thus enhancing the camera's performance and maintaining exposure control.
Implementation Method 1
an aperture stop unit configured to adjust light intensity
Implementation Method 2
an image pickup element configured to perform a photoelectric conversion of an optical image formed via a lens apparatus
Data Source
AI summary
A lens apparatus includes an aperture stop unit that adjusts light intensity, a terminal configured so that a voltage is applied in a state of connecting to an image pickup apparatus, a drive circuit that drives the aperture stop unit, and a controller that controls the drive circuit, the controller controls the drive circuit in a drive mode that drives the aperture stop unit from a first position to a second position without driving the aperture stop unit to an open position.