Interchangeable Lens Aperture Control for Smooth Video
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Solution Overview
Problem
Conventional interchangeable lens cameras struggle to record smooth moving images due to limitations in exposure control, particularly when surroundings become brighter, as they rely solely on shutter speed adjustments, and lack the ability to dynamically control the diaphragm for moving image recording.
Innovation Solution
An interchangeable lens system with a diaphragm that can be controlled by the camera body, featuring a drive unit and lens controller to adjust the aperture based on new instructions without waiting for previous operations to complete, ensuring flexible exposure control for smooth moving image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the shutter speed is increased to compensate for bright surroundings during moving image recording, then exposure control is maintained, but the moving image becomes unnatural and less smooth
Solution Approach 1:
The patent changes the exposure control parameter from shutter speed alone to include diaphragm aperture. By adjusting the diaphragm aperture value in addition to shutter speed, the system can maintain proper exposure while preserving natural moving image quality, avoiding the unnatural effects caused by excessive shutter speed increases.
2Illumination intensity
If the diaphragm aperture is changed dynamically during moving image recording, then exposure control is improved, but the aperture change operation may not complete before a new instruction is received
Solution Approach 1:
The patent implements preliminary action by having the lens controller prepare to execute new aperture change instructions immediately upon receipt, even if a previous aperture change operation is still in progress. The controller queues and processes multiple aperture adjustment commands sequentially without waiting for each operation to fully complete, thereby reducing time loss and improving responsiveness to changing light conditions.
3Reliability
If the lens waits for previous aperture operations to complete before accepting new instructions, then operation reliability is maintained, but responsiveness to changing light conditions during moving image recording is reduced
Solution Approach 1:
The patent applies dynamics by making the lens controller's instruction acceptance behavior adaptive. Instead of a static wait-for-completion protocol, the controller dynamically accepts and queues multiple aperture change instructions in rapid succession during moving image recording, adjusting its operational mode based on the recording state to achieve both reliability and speed.
Data Source
AI summary
An interchangeable lens which is mountable to a camera body and operates according to a command from the camera body includes a diaphragm operable to regulate an amount of light from a subject by changing an aperture, a drive unit operable to change the aperture of the diaphragm, and a lens controller operable to control the drive unit to change the aperture of the diaphragm according to an instruction received from the camera body. When the lens controller receives a new instruction from the camera body while changing the aperture of the diaphragm, the lens controller controls the drive unit to change the aperture of the diaphragm based on the new instruction without waiting for completion of the change of the aperture according to a previous instruction.