Shutter Control Device Lens Delay Compensation
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Solution Overview
Problem
In cameras with interchangeable lenses, the responsiveness of the shutter varies with different lens barrels, making it difficult to control shutter speed accurately, especially at high speeds.
Innovation Solution
A shutter control device with a communication port, shutter control unit, and memory in both the camera body and lens barrel, which transmits and receives signals to adjust the shutter operation timing based on stored shutter delay information, ensuring accurate shutter speed control regardless of the lens barrel attached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a shutter is provided in a lens barrel with interchangeable lenses, then the camera can accommodate different lenses with varying shutter structures, but the shutter responsiveness varies depending on the lens barrel, making it difficult to control shutter speed with high accuracy
Solution Approach 1:
The system performs preliminary measurement of shutter responsiveness characteristics for each lens barrel and stores this data in advance. Before actual photography, the camera body reads the lens ID and retrieves the corresponding responsiveness characteristics from stored data, then pre-calculates the optimal shutter control signal timing to compensate for the specific lens's responsiveness variations, ensuring accurate shutter speed control across different lens barrels
Solution Approach 2:
The system establishes a feedback mechanism where shutter responsiveness characteristics are measured for each lens barrel and fed back into the control system. The camera body continuously monitors actual shutter performance and adjusts control signals based on stored responsiveness data, creating a closed-loop system that maintains accurate shutter speed control despite variations in different lens barrels
2Device complexity
If the shutter control signal is transmitted without considering lens-specific delay, then the control system remains simple, but the actual shutter speed deviates from the commanded shutter speed, especially at high shutter speeds
Solution Approach 1:
The system performs preliminary measurement of shutter responsiveness characteristics for each lens barrel and stores this data in advance. Before actual photography, the camera body reads the lens ID and retrieves the corresponding responsiveness characteristics from stored data, then pre-calculates the optimal shutter control signal timing to compensate for the specific lens's responsiveness variations, ensuring accurate shutter speed control across different lens barrels
Solution Approach 2:
The system changes the timing parameter of the shutter control signal based on the specific lens barrel being used. By adjusting the advance timing of the control signal according to stored responsiveness characteristics for each lens, the system compensates for variations in shutter response time without requiring complex hardware modifications, thereby maintaining both simplicity and reliability
Data Source
AI summary
A shutter control device performs photography by operating a shutter housed in a lens barrel, and comprises a communication port, a shutter control unit and a memory. The communication port transmits and receives signals between the camera body and the lens barrel. The shutter control unit is provided in the camera body to output a shutter control signal. The memory is provided in the lens barrel to store shutter delay information regarding a time delay from when the shutter control signal is input to the lens barrel until when the shutter is closed. The shutter control unit receives the shutter delay information from the lens barrel and transmits the shutter control signal to the lens barrel through the communication port, ahead of an exposure time as determined by photometry, by an amount of time equal to the time delay.