Imaging Element Roll Control for Exposure Uniformity
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Solution Overview
Problem
Existing imaging apparatuses struggle to effectively correct image shake in the roll direction, leading to exposure unevenness and unintended composition changes during photography, as they fail to adequately control rotational movements of the imaging element.
Innovation Solution
An imaging apparatus with a driving unit, shutter unit, and processor configuration that controls the rotational movement of the imaging element based on shake detection, using an actuator and shutter mechanism to synchronize charge accumulation and exposure, thereby minimizing exposure unevenness and maintaining the intended composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the imaging element is rotated in the roll direction to correct image shake, then image shake correction performance is improved, but exposure unevenness occurs and composition changes
Solution Approach 1:
The patent applies preliminary action by stopping the shake correction operation before the imaging element starts charge accumulation during exposure. This ensures that no rotational movement occurs during the exposure period, preventing exposure unevenness and composition changes while still maintaining shake correction capability for the intended shot
2Reliability
If the imaging element is moved to a specified position before shooting, then exposure change due to parallel movement is inhibited, but composition change occurs and unintended shooting may be performed
Solution Approach 1:
The patent uses preliminary action by positioning the shake correction unit at a predetermined position (typically the center position) before exposure begins. This preliminary positioning prevents exposure changes due to parallel movement while avoiding composition changes by not making unnecessary rotational movements that would alter the framing
3Reliability
If roll direction shake correction is continuously applied, then image shake in roll direction is corrected, but exposure unevenness and composition change cannot be inhibited
Solution Approach 1:
The patent applies preliminary action by stopping the roll direction shake correction before exposure starts and maintaining the imaging element at a stable position during the exposure period. This temporal separation allows shake correction to be effective for capturing the intended shot while preventing exposure unevenness during the actual exposure
Solution Approach 2:
The patent implements dynamic control by adjusting the shake correction operation based on the exposure timing. The system dynamically stops the shake correction unit before exposure and maintains it at a predetermined position during exposure, then can resume operation after exposure. This dynamic adjustment resolves the contradiction between needing shake correction and preventing exposure unevenness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces exposure unevenness and maintains the intended composition by restricting roll direction movement during exposure, ensuring consistent image quality and user-intended framing.
Implementation Method 1
an imaging element 6 having a plurality of pixels that photoelectrically convert light from an imaging optical system 3
Data Source
AI summary
An imaging apparatus includes a shake detector and a shake correction unit. The shake correction unit performs image shake correction by moving an imaging element in a plane orthogonal to an optical axis of an imaging optical system. A shutter operation is performed using an electronic front curtain by the imaging element and a rear curtain of a shutter mechanism unit. A camera system controller performs driving control of the shake correction unit using a detection signal of the shake detector. If the camera system controller performs exposure control using the electronic front curtain and the rear curtain, the camera system controller performs regulation control for reducing the amount of rotation of the imaging element in a period before exposure during which the shake correction unit is active according to exposure conditions. Alternatively, the camera system controller performs control for luminance correction of a captured image according to exposure conditions.