Shake Correction Device Parallel Shake Polarity Management
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Solution Overview
Problem
Existing shake correction technologies fail to accurately correct image blur caused by parallel shake in cameras, as they do not adequately consider the influence of rotation radius polarity changes, leading to potential increased shake and unstable correction operations.
Innovation Solution
A shake correction device comprising an angular velocity detection unit, acceleration detection unit, rotation radius calculation unit, correction calculation unit, and shake correction unit that determines the appropriate rotation radius and polarity for correction, taking into account the difference between calculated and stored rotation radii, to ensure accurate and stable correction of parallel shake during exposure periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rotation radius is updated continuously during exposure period, then the correction accuracy for parallel shake is improved, but the polarity changes frequently causing unstable correction operations
Solution Approach 1:
The patent applies dynamics by making the rotation radius adjustable and updateable during the exposure period based on detected shake characteristics. The system dynamically adapts the rotation radius value to match actual shooting conditions, allowing the correction mechanism to respond to changing parallel shake patterns while maintaining operational stability through controlled update frequency and polarity management.
Solution Approach 2:
The patent changes the parameter of rotation radius from a fixed value to a dynamically adjustable parameter that can be updated during exposure. By allowing the rotation radius to change based on detected shake amounts and characteristics, the system achieves accurate correction for varying parallel shake conditions while managing polarity transitions to ensure stable operation.
2Reliability
If the rotation radius is set to zero when reliability is low, then calculation errors are prevented, but the correction amount becomes zero reducing correction effectiveness
Solution Approach 1:
The patent applies beforehand cushioning by preparing multiple rotation radius values in advance and selecting appropriate values based on detected shake characteristics before performing correction calculations. This prevents calculation errors by ensuring a valid rotation radius is always available, while maintaining correction effectiveness through pre-selected alternative values that account for varying shake conditions.
Solution Approach 2:
The patent uses feedback by continuously monitoring the reliability of rotation radius calculations and adjusting the rotation radius value based on detected shake characteristics. When calculation reliability is low, the system feedback-adjusts the rotation radius to a pre-prepared alternative value, preventing calculation errors while maintaining correction precision through intelligent value selection based on actual shooting conditions.
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 enables accurate correction of parallel shake by considering rotation radius polarity changes, preventing erroneous operations and ensuring stable image capture in live view, static image, or video modes.
Implementation Method 1
an angular velocity detection unit that detects an angular velocity of a shake
Implementation Method 2
an acceleration detection unit that detects an acceleration of a shake
Data Source
AI summary
An object of the present invention is to provide a shake correction device, an imaging apparatus, and a shake correction method capable of accurately correcting a parallel shake. According to a shake correction device according to an aspect of the present invention, since a rotation radius to be used in correction of a shake is determined based on a calculated rotation radius and whether or not a polarity corresponding to the calculated rotation radius is different from a polarity corresponding to a rotation radius stored in advance and an image blur is corrected based on a correction amount corresponding to the determined rotation radius, it is possible to accurately correct a parallel shake by taking influence on a polarity of correction due to the updating of the rotation radius into consideration. The “rotation radius stored in advance” may be a fixed value or may be updated during a period of the shake correction. The shake correction can be performed by displacing a shake correction lens and/or an imaging element.