Shift Lens Image Stabilization with Coordinated Focus Control
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Solution Overview
Problem
Significant deviation of the shift lens from the optical axis during image stabilization in cameras leads to decreased object contrast at the image center, causing image blur and discomfort to photographers, especially when camera shake occurs during exposure.
Innovation Solution
An image stabilization apparatus that includes a driving control unit to correct image blur by moving the shift lens and a focus control unit to coordinate the movement of the focusing lens, ensuring precise focus adjustment in the imaging optical system, thereby maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shift lens is driven significantly to cancel out image blur caused by camera shake, then image stabilization performance is improved, but the contrast of the object at the central portion of the image decreases, causing the image to become out-of-focus
Solution Approach 1:
The focus control unit performs focus adjustment in advance based on the shift lens position before image capture. By calculating the required focus correction from the shift amount and applying it beforehand, the system ensures that even when the shift lens is significantly driven for stabilization, the image remains in focus with high contrast.
Solution Approach 2:
The system uses feedback from the shift lens position detection to dynamically adjust the focusing lens position. The focus control unit continuously monitors the shift lens position and adjusts the focusing lens accordingly to maintain optimal focus, creating a closed-loop control system that compensates for focus degradation caused by shift lens movement.
2Reliability
If the shift lens deviates from the optical axis significantly during exposure to correct camera shake, then image blur correction is improved, but the object contrast decreases and image quality deteriorates
Solution Approach 1:
The system performs focus adjustment in advance based on the shift lens position before image capture. By calculating the required focus correction from the shift amount and applying it beforehand, the system ensures that even when the shift lens is significantly driven for stabilization, the image remains in focus with high contrast.
Solution Approach 2:
The system dynamically changes the focusing lens position parameter based on the shift lens position. By adjusting the focus parameter in response to shift lens movement, the system maintains optimal image quality and contrast even when the shift lens is driven significantly for blur correction.
3Device complexity
If the focusing lens is fixed during exposure, then the focusing mechanism is simple, but camera shake during exposure causes the image to become out-of-focus and reduces object contrast
Solution Approach 1:
The system performs focus adjustment in advance based on the shift lens position before image capture. By calculating the required focus correction from the shift amount and applying it beforehand, the system ensures that even when the shift lens is significantly driven for stabilization, the image remains in focus with high contrast.
Solution Approach 2:
The system uses feedback from the shift lens position detection to dynamically adjust the focusing lens position. The focus control unit continuously monitors the shift lens position and adjusts the focusing lens accordingly to maintain optimal focus, creating a closed-loop control system that compensates for focus degradation caused by shift lens movement.
Data Source
AI summary
An image stabilization apparatus includes: a driving control unit that drives an image stabilization unit to optically correct image blur of an object image caused by a shake of an apparatus, the image stabilization unit moving the object image on a screen of an image sensor; and a focus control unit that performs control to drive a focusing lens in coordination with an operation of the image stabilization unit, the focusing lens being used to perform focus adjustment in an imaging optical system.