Lens Stabilization via Position Feedback Control
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Solution Overview
Problem
Digital photographing apparatuses face issues with image stabilization due to user movements, leading to defective photographs, as existing systems rely on angular velocity detection and lens movement calculations which may not accurately converge the lens position variations.
Innovation Solution
A digital photographing apparatus equipped with a position sensor and an optical driving processor that calculates and converges movement position variations of the lens unit based on current position information, using a reference movement position variation to adjust the driving current applied to the optical driving module, ensuring reliable movement control across the lens unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If angular velocity detection and lens movement calculation are used for image stabilization, then movement compensation is achieved, but lens position convergence accuracy deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the actual lens position is continuously detected by a position sensor (e.g., Hall sensor) and compared with the target position. The position difference is fed back to the controller, which adjusts the driving current to minimize the error, ensuring accurate convergence of the lens position throughout the entire movement range.
Solution Approach 2:
The patent replaces the traditional mechanical calculation-based stabilization system with an electronic feedback control system. Instead of relying solely on angular velocity detection and predetermined movement calculations, the system uses real-time position sensing and electronic adjustment of driving current to achieve more accurate and reliable lens position control.
2Reliability
If optical image stabilization is applied across the entire lens unit section, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent makes the stabilization system universally applicable across the entire lens unit by implementing a general feedback control mechanism that works at any position within the lens movement range. The position sensor and controller work together to provide stabilization functionality throughout the full section of the lens unit, rather than requiring different mechanisms for different regions.
Solution Approach 2:
The stabilization system is designed to be self-regulating through the feedback mechanism. The position sensor automatically detects the current lens position, the controller calculates the required adjustment, and the driving current is automatically adjusted without requiring external intervention or complex mechanical structures, thereby reducing overall system complexity.
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 effectively stabilizes the lens unit by converging movement position variations, reducing the occurrence of defective photographs by securing predetermined driving performance and reliability in image capture, even under user-induced movements.
Implementation Method 1
a position sensor (e.g., hall sensor) to detect position information of the lens unit
Implementation Method 2
an optical driving module to move the lens unit in x axis or y axis direction
Data Source
AI summary
A digital photographing apparatus and method are disclosed, The digital photographing apparatus includes a position sensor configured to detect position information of a lens unit, and an optical driving processor configured to calculate a movement position variation of the lens unit based on the position information of the lens unit, compare the movement position variation with a reference movement position variation, and cause the movement position variation to converge on the reference movement position variation.