Image Stabilizer Correction Mode Switching
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Solution Overview
Problem
Image blur correction effectiveness varies with focal distance in optical systems, leading to incompatibility and reduced vibration reduction effectiveness during pan/tilt operations.
Innovation Solution
An image blur correction apparatus that determines pan/tilt operations based on the size of the correction amount, rather than the blur signal, and switches correction modes accordingly to maintain constant effectiveness across different focal distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pan/tilt determination is made based on blur signal threshold detection, then the determination method is simple, but the effectiveness of image blur correction changes according to focal distance
Solution Approach 1:
The patent changes the determination parameter from blur signal magnitude to correction amount magnitude. Since the correction amount is calculated by multiplying the blur signal by a gain value that varies with focal distance, using correction amount as the determination basis automatically compensates for focal distance variations. This resolves the contradiction by maintaining consistent pan/tilt determination thresholds across different focal distances, ensuring reliable image blur correction effectiveness without increasing system complexity.
2Adaptability or versatility
If correction range changes according to focal distance, then the correction adapts to different focal distances, but incompatibility is produced and vibration reduction effectiveness changes
Solution Approach 1:
The patent changes the parameter used for pan/tilt determination from blur signal magnitude to correction amount magnitude. The correction amount incorporates a gain value that is set according to focal distance, so when the same correction amount threshold is used across different focal distances, it automatically adapts to the appropriate correction range for each focal distance. This eliminates the incompatibility issue and maintains consistent vibration reduction effectiveness regardless of focal distance changes.
Data Source
AI summary
An image blur correction apparatus that includes a blur detection device, which detects a vibration applied to an optical system and outputs a blur signal in accordance with the detected vibration. Image blur correction is performed to cancel out an image blur that is produced by a vibration applied to the optical system, based on a blur signal output from the blur detection device. A determining device determines whether or not the size of a correction amount, indicating a size of an image blur correction according to the image blur correcting device, exceeds a predetermined threshold value. When the determining device determines that the a size of a correction amount exceeds a predetermined threshold value, the determination device switches from a mode of image blur correction to a mode of a pan/tilt operation.