Image Capturing Apparatus Optical Axis Shake Correction

The patent segments the shake detection into two independent components: rotation detection (using angular velocity meter) and translation detection (using accelerometer). By separating these functions, the system can process each component with appropriate methods, extracting frequency components from both signals and comparing them to calculate the rotation radius, thereby obtaining accurate optical axis shake information while filtering out accelerometer noise through frequency-based signal processing

The patent introduces the rotation radius as an intermediary parameter that connects rotation detection and translation detection. By calculating the rotation radius from the comparison of extracted frequency components, the system uses this intermediary value to convert rotation signals into equivalent translation components, enabling accurate shake measurement without directly relying on noisy accelerometer data alone

The patent implements a feedback mechanism where the detected optical axis shake (calculated from rotation and translation components) is continuously fed back to control the focus lens. The system extracts frequency components from both rotation and translation signals, compares them to obtain rotation radius, calculates the optical axis translation component, and uses this information to drive the focus lens for real-time focus correction, ensuring stable focus during macro photography despite camera movement

The patent performs preliminary detection and analysis of shake components before executing focus correction. By first detecting rotation and translation components separately, extracting their frequency characteristics, and calculating the rotation radius in advance, the system prepares the correction data needed for immediate focus adjustment, enabling rapid and accurate focus stabilization when macro photography is performed