Camera Body Diaphragm Drive Speed Control for Moving Image Exposure
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Solution Overview
Problem
Existing imaging apparatuses experience abrupt changes in exposure and brightness when capturing moving images, leading to uncomfortable viewing experiences for users.
Innovation Solution
A camera body with interchangeable lenses that includes an imaging unit, detector, controller, sending unit, and mode setting unit, allowing for two operating modes: one for automatic adjustment of aperture and exposure, and another for adjusting aperture with fixed exposure, with slower average drive speed in the second mode to prevent abrupt exposure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the diaphragm is automatically adjusted at high speed for rapid exposure control, then the exposure response speed is improved, but the brightness changes abruptly among frames causing uncomfortable viewing
Solution Approach 1:
The patent applies parameter changes by differentiating the drive speed of the diaphragm based on the operating mode. In the first mode (automatic adjustment of both aperture and exposure time), a higher drive speed is used for rapid exposure control. In the second mode (automatic adjustment of aperture only with fixed exposure time), a lower drive speed is used to prevent abrupt brightness changes. This dynamic adjustment of the drive speed parameter resolves the contradiction between response speed and viewing comfort.
2Device complexity
If the aperture value is automatically adjusted with fixed exposure time, then the control complexity is reduced, but the exposure control resolution is insufficient compared to adjusting both aperture and exposure time
Solution Approach 1:
The patent segments the exposure control function into two distinct operating modes. The first mode segments control by adjusting both aperture and exposure time independently, providing fine-grained exposure control resolution. The second mode segments control by fixing exposure time and adjusting only aperture, simplifying the control system. This segmentation allows the system to choose the appropriate level of complexity based on the specific imaging requirements.
Data Source
AI summary
A camera body includes an imaging unit for generating image data from an optical signal incident via the interchangeable lens, a detector for detecting a light quantity of the optical signal, a controller for setting an aperture value of a diaphragm of the interchangeable lens and an exposure condition which is a setting relating to exposure other than a setting of the diaphragm, a sending unit for sending a control signal for control with the set aperture value to the interchangeable lens, and a mode setting unit for selecting one from a plurality of operating modes. The plurality of operating modes includes a first mode for automatically adjusting the aperture value of the diaphragm and the exposure condition according to the detected light quantity during capturing of a moving image, and a second mode for automatically adjusting the aperture value with the exposure condition being fixed according to the detected light quantity during capturing of the moving image. An average drive speed of the diaphragm for automatically adjusting the aperture value in the second mode is slower than that in the first mode.