Shutter Curtain Positioning for Stable Exposure Timing
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Solution Overview
Problem
In imaging apparatuses, the position of the front curtain becomes unstable during consecutive photographing due to the impact of the rear curtain's return, affecting exposure timing and accuracy.
Innovation Solution
The imaging apparatus includes a blade-driving device with a front curtain and rear curtain that move between closing and open positions, controlled by actuators and a driving control unit, where the front curtain is moved to the open position and then returned to the closing position after the rear curtain is moved to the open position, ensuring stable exposure operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rear curtain is returned to the initial position after the first shot during consecutive photographing, then the shutter is prepared for the next exposure operation, but the front curtain position becomes unstable due to impact from the rear curtain movement
Solution Approach 1:
The front curtain is returned to the initial position in advance before the rear curtain completes its movement. This preliminary action ensures that the front curtain is properly positioned and stabilized before the next exposure operation begins, preventing position instability caused by rear curtain impact.
Solution Approach 2:
The front curtain movement is designed to counteract the impact effect from the rear curtain return. By moving the front curtain in the opposite direction or at a different timing, the system compensates for the destabilizing impact, maintaining exposure timing accuracy throughout consecutive photographing operations.
2Speed
If the front curtain is moved immediately for the next exposure after the first shot, then exposure operation speed is improved, but the moving start timing of the front curtain changes due to unstable position
Solution Approach 1:
The front curtain returns to the initial position in advance during the period when the rear curtain is still moving. This preliminary positioning ensures that when the next exposure operation starts, the front curtain is already in the correct position, maintaining consistent exposure time without delaying the exposure operation.
Data Source
AI summary
An imaging apparatus is provided, including a blade-driving device and a driving control unit which drives the front curtain actuator and the rear curtain actuator. The front curtain and the rear curtain are positioned at the open position at a time of start and termination of imaging, in which the front curtain moves from the closing position to the open position, and the rear curtain moves from the open position to the closing position, thereby performing an exposure operation. During consecutive photographing, the front curtain positioned at the closing position is moved once in a direction of the open position and is then returned to the closing position after the rear curtain is moved to the open position after termination of the exposure operation, and before a subsequent exposure operation is performed.