Interchangeable Lens Diaphragm Stabilization Timing Control
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Solution Overview
Problem
Mechanical fluctuations in camera systems, such as gear looseness and shaft twist, cause aperture diameter overshoot or undershoot, making it difficult to determine when the diaphragm has stabilized, which can lead to inaccurate exposure timing during shooting.
Innovation Solution
An interchangeable lens with a diaphragm driving unit and a lens control unit that transmits diaphragm driving information, including stabilization time information, to the shooting apparatus, allowing the body control unit to determine the exposure start timing based on this data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the diaphragm is driven by a motor via gear and shaft to adjust aperture diameter, then the diaphragm can be controlled to change aperture size, but mechanical looseness and shaft twist cause overshoot or undershoot making it difficult to determine when stabilization is complete
Solution Approach 1:
The lens control unit calculates and transmits the driving end time (including stabilization time) to the body control unit before the diaphragm driving actually completes. This allows the shooting apparatus to prepare the exposure timing in advance, ensuring accurate exposure timing without waiting for real-time stabilization detection.
Solution Approach 2:
The patent introduces diaphragm driving information (including stabilization time) as an intermediary parameter between the lens control unit and body control unit. This information mediator allows the shooting apparatus to accurately determine exposure start timing without directly monitoring the mechanical stabilization process.
2Productivity
If shooting is started immediately after motor finishes driving the diaphragm, then shooting speed is improved, but exposure timing becomes inaccurate due to ongoing mechanical fluctuations
Solution Approach 1:
The lens control unit calculates the driving end time (including stabilization time) in advance and transmits it to the body control unit before the diaphragm driving completes. This allows the shooting apparatus to determine the exact exposure start timing beforehand, ensuring both high shooting speed and accurate exposure timing.
Solution Approach 2:
The lens control unit provides feedback information (driving end time including stabilization time) to the body control unit, enabling the shooting apparatus to accurately synchronize exposure timing with diaphragm stabilization without delaying the shooting process.
3Device complexity
If the stabilization time is not transmitted to the shooting apparatus, then the device complexity is reduced, but it becomes impossible to determine accurate exposure start timing
Solution Approach 1:
The patent introduces diaphragm driving information (including stabilization time) as an intermediary parameter between the lens control unit and body control unit. This information mediator allows the shooting apparatus to accurately determine exposure start timing without directly monitoring the mechanical stabilization process, maintaining simple device architecture while achieving precise timing.
Data Source
AI summary
The present technology relates to an interchangeable lens and a method for controlling the same capable of starting shooting in consideration of mechanical fluctuations after a diaphragm is driven, a shooting apparatus, and a camera system. An interchangeable lens includes a diaphragm, a diaphragm driving unit that drives the diaphragm, and a lens control unit that transmits diaphragm driving information including stabilization time information of the diaphragm to a shooting apparatus when the diaphragm driving unit drives the diaphragm. The present technology is applicable to lens-interchangeable digital cameras, and the like, for example.