Lens Unit Image Blur Correction via Barycentric Position Control
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Solution Overview
Problem
Existing image blur correction systems face challenges in maintaining optimal performance when the barycentric position of the lens unit changes due to focus adjusting or zooming operations, as the required driving force increases, making it difficult to rotate the lens unit effectively and correct image blur.
Innovation Solution
An image blur correction apparatus and method that includes a lens unit with an imaging optical system, supported rotatably in yawing and pitching directions, equipped with a shake detection unit, position detection unit, drive unit, and blur correction control unit. The system calculates the barycentric position and controls the drive operation based on detected shake, position, and barycentric position to perform proportional, differential, and integral control, ensuring optimal image blur correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the barycentric position of the lens unit changes due to focus adjusting or zooming operations, then the lens unit can perform focus and zoom functions, but the driving force required to rotate the lens unit increases, making it difficult to perform optimal image blur correction
Solution Approach 1:
The system dynamically adjusts the drive signal based on the barycentric position of the lens unit. The barycentric position detection unit continuously monitors the position, and the drive signal generation unit modifies the drive signal in real-time according to the detected position, allowing the lens unit to maintain optimal rotation capability across different focus and zoom states
Solution Approach 2:
The system implements a feedback mechanism where the barycentric position detection unit provides continuous information about the lens unit's position to the drive signal generation unit. This feedback loop enables the system to compensate for position changes and maintain appropriate driving force for image blur correction operations
2Reliability
If the driving force is increased to compensate for barycentric position changes, then the lens unit can be rotated effectively, but power consumption increases
Solution Approach 1:
The system changes the parameters of the drive signal based on the barycentric position. By adjusting the magnitude and characteristics of the drive signal according to the detected position, the system achieves reliable image blur correction while minimizing unnecessary power consumption that would result from using constantly high drive force
3Adaptability or versatility
If the lens unit is rotated with larger inertia due to barycentric position displacement, then the lens unit can accommodate focus and zoom movements, but the response speed to shake correction decreases
Solution Approach 1:
The system dynamically adjusts the drive signal characteristics based on the barycentric position to optimize the lens unit's response characteristics. By modifying the drive signal in real-time according to position changes, the system maintains appropriate acceleration and response speed for shake correction while accommodating focus and zoom operations
Solution Approach 2:
The system performs preliminary detection of the barycentric position and pre-adjusts the drive signal accordingly before shake correction is needed. This allows the lens unit to be in the optimal state for rapid response to shake correction commands regardless of the current focus or zoom position
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
This solution enables optimal image blur correction even when the barycentric position of the lens unit varies, improving performance by adjusting the driving force and preventing excessive power consumption, thus ensuring efficient image blur correction across a broader shake range.
Implementation Method 1
two drive motors (flat motor) each of which includes a plurality of coil parts, a magnet, and a yoke are used as drive units to rotate the lens unit in the yawing direction and in the pitching direction
Data Source
AI summary
A lens unit 20 including an imaging optical system 31 and an imaging unit 33 to generate an image signal of an imaged image is supported rotatably in a yawing direction and in a pitching direction. Based on a shake which is applied to the lens unit 20 and is detected by a shake detection unit 61, a barycentric position of the lens unit 20 which position is calculated by a barycentric position calculation unit 62, and a position of the lens unit 20 which position is detected by a position detection unit 46, a driving operation by a drive unit 45 to perform rotation driving of the lens unit 20 in the yawing direction and in the pitching direction is controlled and image blur correction of the imaged image is performed. Even when the barycentric position of the lens unit varies due to a focus adjusting operation, a zooming operation, or the like, it becomes possible to perform optimal image blur correction and to improve performance in image blur correction.