Image Sensor Stabilization Moving Center Adjustment
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Solution Overview
Problem
Existing imaging apparatuses face issues with peripheral light amount drop and composition shift during live-view imaging due to excessive movement of the image stabilization unit, which affects image stabilization performance and user intention in non-special imaging modes.
Innovation Solution
An imaging apparatus with an image sensor and an image sensor image stabilization unit that moves orthogonally to the optical axis, controlled by a controller determining the moving center based on imaging optical system information in electronic preview mode to minimize light loss and composition shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the image stabilization unit moves with a large motion range to improve image stabilization performance, then image stabilization performance is improved, but peripheral light amount drops and composition shifts occur
Solution Approach 1:
The patent applies dynamics by making the moving center of the image sensor adjustable rather than fixed. The controller dynamically determines the moving center based on the imaging optical system characteristics (such as image circle diameter) and operational mode (live-view vs. optical preview). This allows the system to adapt the stabilization movement parameters in real-time to prevent peripheral light loss while maintaining stabilization effectiveness.
Solution Approach 2:
The patent changes the parameter of moving center position based on different operational conditions. In live-view mode, the moving center is positioned to avoid shielding light flux from the imaging optical system. In optical preview mode, the moving center is positioned to prevent composition shift. This parameter adjustment resolves the contradiction between stabilization performance and light amount preservation.
2Reliability
If the image stabilization unit moves with a large motion range to improve image stabilization performance, then image stabilization performance is improved, but composition shift occurs when combined with optical viewfinder
Solution Approach 1:
The system dynamically adjusts the moving center position based on the operational mode. When optical preview mode is detected, the controller positions the moving center to align with the optical viewfinder's optical axis, ensuring composition consistency. This dynamic adjustment prevents composition shift while maintaining stabilization performance in live-view mode.
Solution Approach 2:
The patent changes the moving center parameter according to the operational mode: in optical preview mode, the moving center is set to prevent composition shift relative to the optical viewfinder, while in live-view mode, it is set to optimize stabilization without compromising light flux. This parameter switching resolves the contradiction between stabilization and composition stability.
3Stability of the object's composition
If the image stabilization unit is positioned to prevent composition shift in optical preview mode, then composition consistency is improved, but peripheral light amount drops in live-view mode
Solution Approach 1:
The system switches the moving center position dynamically based on the detected operational mode. When live-view mode is active, the controller adjusts the moving center to a position that prevents light flux shielding. When optical preview mode is active, it switches to a position that prevents composition shift. This dynamic switching resolves the contradiction between the two modes' requirements.
Solution Approach 2:
The patent implements parameter changes by switching the moving center position based on operational mode. The controller determines which parameter set to use (light-flux-optimized or composition-optimized) based on whether the system is in live-view or optical preview mode, thereby resolving the contradiction between these two competing requirements.
Data Source
AI summary
An imaging apparatus includes an image sensor configured to capture an object image formed through an imaging optical system, an image stabilization unit configured to move the image sensor on a plane orthogonal to an optical axis in the imaging optical system, and a controller configured to control a movement by the image stabilization unit, and to determine a moving center in the image plane image stabilization unit based on information on the imaging optical system in an electronic preview mode used to observe an image signal about the object image based on an output from the image sensor.