Image Shake Correction Controller Power Distribution Optimization
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Solution Overview
Problem
Existing image shake correction devices face challenges in maintaining performance while reducing power consumption, as they often result in unnecessary movement and reduced image shake correction efficiency due to inadequate power distribution among actuators.
Innovation Solution
The implementation of a controller that decides and optimally distributes power among multiple drive units to move a movable unit, including an imaging element or lens, to maintain the power ratio and reduce total power consumption, employing a first control to reduce power when exceeding the available power and a second control to adjust power distribution based on imaging conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If control for reducing the power amount of the actuator to which the largest power amount is supplied is simply performed, then power consumption is reduced, but the optimal power distribution ratio is lost causing unnecessary movement of the movable unit
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the power distribution ratio among multiple actuators based on their individual characteristics and current operational states. Instead of using a fixed reduction approach, the system modifies the power allocation parameters to maintain optimal performance while reducing total consumption. The controller calculates and applies different power reduction levels to each actuator based on its contribution to the overall correction function, thereby preserving the effective power distribution ratio.
Solution Approach 2:
The system implements dynamics by continuously adapting the power distribution strategy in real-time based on imaging conditions, actuator positions, and power consumption levels. The controller dynamically adjusts which actuator receives reduced power and by how much, rather than applying a static reduction rule. This dynamic approach ensures that the movable unit maintains smooth movement and accurate positioning even as total power availability changes.
2Reliability
If the movable unit is moved to a target position with optimal power distribution, then image shake correction performance is maintained, but total power consumption increases
Solution Approach 1:
The patent applies partial action by selectively reducing power to specific actuators rather than uniformly reducing power to all actuators. The system identifies which actuators can tolerate power reduction without compromising the overall correction performance, and applies reduced power only to those actuators. This partial reduction approach maintains sufficient correction performance while achieving lower total power consumption compared to maintaining optimal power distribution across all actuators.
Solution Approach 2:
The system changes operational parameters by adjusting the power distribution ratio based on current imaging conditions and actuator states. When power consumption needs to be reduced, the controller modifies the power allocation parameters to distribute available power more efficiently, rather than maintaining the original optimal distribution ratio. This parameter adaptation allows the system to operate effectively at lower power levels.
3Use of energy by moving object
If the movement range of the movable unit is narrowed to suppress power consumption, then power consumption is reduced, but image shake correction performance cannot be sufficiently secured
Solution Approach 1:
The patent applies local quality by treating each actuator individually with its own power distribution characteristics rather than applying a uniform power reduction to the entire system. The controller adjusts power allocation locally at each actuator based on its specific role, position, and contribution to image shake correction. This localized power management allows the system to reduce overall power consumption while maintaining adequate correction performance in critical areas.
Solution Approach 2:
The system uses dynamics to adaptively adjust the movement range and power consumption based on actual imaging conditions. Rather than narrowly limiting the movement range as a fixed constraint, the controller dynamically determines the necessary movement range based on detected shake levels and power availability. This dynamic adjustment allows the system to maintain sufficient correction performance while consuming less power than a fixed narrow-range approach.
Data Source
AI summary
A digital camera (100) includes a plurality of drive units that moves a movable member (2) including an imaging element (20) in directions X, Y, and θ along a light receiving surface (20a) of the imaging element (20), and a system controller (108) that controls the plurality of drive units. The system controller (108) includes a power amount decision unit (108A) that decides power amounts to be supplied to the plurality of drive units for moving the movable member (2) to a target position, and a drive controller (108B) that performs a first control for reducing a total value of the power amounts decided by the power amount decision unit (108A) while maintaining a ratio between the power amounts decided by the power amount decision unit (108A) and supplying the power amounts after the reduction to the drive units.